#306

AGENTS.md

@@ -268,7 +268,20 @@ const value =
 - Put two blank lines before and after top-level `const` function
   declarations, unless imports, exports, or file boundaries make that awkward.
 - In TSX, indent with 4-space logical indentation.
+- In TypeScript and TSX, convert every leading run of 8 spaces to a tab
+  character.
 - A leading tab is exactly equivalent to 8 leading spaces.
+- Never place a closing parenthesis at the beginning of a line.
+- Never place a closing square bracket at the beginning of a line.
+- For object literals and other associative-array-style braces, do not place
+  the closing brace at the beginning of a line. Function, lambda, callback, and
+  block closing braces are exempt and should stay on their own line when that
+  fits the local style.
+- When writing braces on a single line in TypeScript or TSX JavaScript
+  context, put exactly one space inside the braces, as in `{ value }` or
+  `{ key: value }`.
+- Do not add inner spaces to React/JSX expression braces, as in
+  `prop={value}`, `{children}`, or `<Component>{{...props}}</Component>`.
 - Keep a tag's closing marker on the same line as the final prop when the tag
   spans multiple lines.
 - Do not put `/>` or `>` on its own line unless the existing surrounding code

backend/app/controllers/materials_controller.rb

@@ -12,33 +12,47 @@ class MaterialsController < ApplicationController
 
     offset = (page - 1) * limit
 
-    tag_id = params[:tag_id].presence
+    filters = material_index_filters
-    parent_id = params[:parent_id].presence
+    q = Material.includes(:material_export_items,
-    unclassified = bool?(:unclassified)
+                          thumbnail_attachment: :blob,
+                          file_attachment: :blob,
+                          tag: :tag_name)
+    q = q.where(file_suppressed_at: nil) if filters[:suppression] == 'active'
+    q = q.where.not(file_suppressed_at: nil) if filters[:suppression] == 'suppressed'
+    q = q.where(tag_id: nil) if filters[:tag_state] == 'untagged'
+    q = q.where.not(tag_id: nil) if filters[:tag_state] == 'tagged'
+    q = q.where('materials.created_at >= ?', filters[:created_from]) if filters[:created_from]
+    q = q.where('materials.created_at <= ?', filters[:created_to]) if filters[:created_to]
+    q = q.where('materials.updated_at >= ?', filters[:updated_from]) if filters[:updated_from]
+    q = q.where('materials.updated_at <= ?', filters[:updated_to]) if filters[:updated_to]
 
-    q = Material.includes(:tag, :created_by_user, :material_export_items).with_attached_file
+    q = material_index_join_tag_name(q) if material_index_needs_tag_name?(filters)
-    if unclassified
+    q = material_index_join_file_blob(q) if material_index_needs_file_blob?(filters)
-      q = q.where(tag_id: nil)
+    q = apply_material_query(q, filters[:q]) if filters[:q].present?
-    else
+    q = apply_material_media_kind(q, filters[:media_kind])
-      q = q.where(tag_id:) if tag_id
-      q = q.where(parent_id:) if parent_id
-    end
 
-    count = q.count
+    count = q.distinct.count(:id)
-    materials = q.order(created_at: :desc, id: :desc).limit(limit).offset(offset)
+    materials =
+        q
+        .order(Arel.sql(material_index_order_sql(filters)))
+        .limit(limit)
+        .offset(offset)
+        .to_a
 
-    render json: { materials: MaterialRepr.many(materials, host: request.base_url), count: count }
+    render json: { materials: MaterialRepr.list_many(materials, host: request.base_url),
+                   count: }
   end
 
   def show
     material =
         Material
         .includes(:tag, :material_export_items)
+        .with_attached_thumbnail
         .with_attached_file
         .find_by(id: params[:id])
     return head :not_found unless material
 
-    wiki_page_body = material.tag.tag_name.wiki_page&.current_revision&.body
+    wiki_page_body = material.tag&.tag_name&.wiki_page&.current_revision&.body
 
     render json: MaterialRepr.base(material, host: request.base_url).merge(wiki_page_body:)
   end
@@ -83,6 +97,8 @@ class MaterialsController < ApplicationController
     end
 
     if material
+      MaterialThumbnailGenerator.generate!(material)
+      material.reload
       render json: MaterialRepr.base(material, host: request.base_url), status: :created
     else
       render_validation_error material
@@ -134,6 +150,9 @@ class MaterialsController < ApplicationController
       raise
     end
 
+    MaterialThumbnailGenerator.generate!(material)
+    material.reload
+
     render json: MaterialRepr.base(material, host: request.base_url)
   end
 
@@ -196,6 +215,134 @@ class MaterialsController < ApplicationController
 
   private
 
+  def material_index_filters
+    tag_state = params[:tag_state].to_s.presence
+    tag_state = 'untagged' if bool?(:unclassified)
+    tag_state = 'all' unless ['all', 'tagged', 'untagged'].include?(tag_state)
+
+    media_kind = params[:media_kind].to_s.presence
+    unless ['all', 'image', 'video', 'audio', 'file_other', 'url_only'].include?(media_kind)
+      media_kind = 'all'
+    end
+
+    suppression = params[:suppression].to_s.presence
+    suppression = 'active' unless ['active', 'suppressed', 'all'].include?(suppression)
+
+    sort = params[:sort].to_s.presence
+    unless ['created_at', 'updated_at', 'tag_name', 'media_kind', 'file_byte_size',
+            'version_no', 'id'].include?(sort)
+      sort = 'created_at'
+    end
+
+    direction = params[:direction].to_s.downcase
+    direction = 'desc' unless ['asc', 'desc'].include?(direction)
+
+    { q: params[:q].to_s.strip.presence,
+      tag_state:,
+      media_kind:,
+      suppression:,
+      created_from: parse_time_param(:created_from),
+      created_to: parse_time_param(:created_to),
+      updated_from: parse_time_param(:updated_from),
+      updated_to: parse_time_param(:updated_to),
+      sort:,
+      direction: }
+  end
+
+  def parse_time_param name
+    value = params[name].to_s.strip
+    return nil if value.blank?
+
+    Time.zone.parse(value)
+  rescue ArgumentError
+    nil
+  end
+
+  def material_index_needs_tag_name? filters
+    filters[:q].present? || filters[:sort] == 'tag_name'
+  end
+
+  def material_index_needs_file_blob? filters
+    filters[:q].present? ||
+        filters[:media_kind] != 'all' ||
+        ['media_kind', 'file_byte_size'].include?(filters[:sort])
+  end
+
+  def material_index_join_tag_name q
+    q.left_joins(tag: :tag_name)
+  end
+
+  def material_index_join_file_blob q
+    q.joins(<<~SQL.squish)
+      LEFT JOIN active_storage_attachments material_file_attachments
+        ON material_file_attachments.record_type = 'Material'
+       AND material_file_attachments.record_id = materials.id
+       AND material_file_attachments.name = 'file'
+      LEFT JOIN active_storage_blobs material_file_blobs
+        ON material_file_blobs.id = material_file_attachments.blob_id
+    SQL
+  end
+
+  def apply_material_query q, term
+    like = "%#{ ActiveRecord::Base.sanitize_sql_like(term) }%"
+    q.where('tag_names.name LIKE :q OR materials.url LIKE :q OR ' \
+            'material_file_blobs.filename LIKE :q',
+            q: like)
+  end
+
+  def apply_material_media_kind q, media_kind
+    case media_kind
+    when 'image'
+      q.where('material_file_blobs.content_type LIKE ?', 'image/%')
+    when 'video'
+      q.where('material_file_blobs.content_type LIKE ?', 'video/%')
+    when 'audio'
+      q.where('material_file_blobs.content_type LIKE ?', 'audio/%')
+    when 'file_other'
+      q.where('material_file_attachments.id IS NOT NULL')
+       .where.not('material_file_blobs.content_type LIKE ?', 'image/%')
+       .where.not('material_file_blobs.content_type LIKE ?', 'video/%')
+       .where.not('material_file_blobs.content_type LIKE ?', 'audio/%')
+    when 'url_only'
+      q.where('material_file_attachments.id IS NULL').where.not(url: [nil, ''])
+    else
+      q
+    end
+  end
+
+  def material_index_order_sql filters
+    direction = filters[:direction] == 'asc' ? 'ASC' : 'DESC'
+    sort_sql =
+        case filters[:sort]
+        when 'tag_name'
+          'tag_names.name'
+        when 'media_kind'
+          material_media_kind_sql
+        when 'file_byte_size'
+          'material_file_blobs.byte_size'
+        when 'updated_at'
+          'materials.updated_at'
+        when 'version_no'
+          'materials.version_no'
+        when 'id'
+          'materials.id'
+        else
+          'materials.created_at'
+        end
+
+    "#{ sort_sql } #{ direction }, materials.id #{ direction }"
+  end
+
+  def material_media_kind_sql
+    "CASE " \
+      "WHEN material_file_attachments.id IS NULL AND materials.url IS NOT NULL THEN 5 " \
+      "WHEN material_file_blobs.content_type LIKE 'image/%' THEN 1 " \
+      "WHEN material_file_blobs.content_type LIKE 'video/%' THEN 2 " \
+      "WHEN material_file_blobs.content_type LIKE 'audio/%' THEN 3 " \
+      "WHEN material_file_attachments.id IS NOT NULL THEN 4 " \
+      "ELSE 6 END"
+  end
+
   def upsert_export_paths! material
     raw = params[:export_paths]
     return if raw.blank?

backend/app/models/material.rb

@@ -15,6 +15,7 @@ class Material < ApplicationRecord
   has_many :material_export_items, dependent: :destroy
 
   has_one_attached :file, dependent: :purge
+  has_one_attached :thumbnail, dependent: :purge
 
   validates :tag_id, presence: true, uniqueness: true
 
@@ -28,6 +29,18 @@ class Material < ApplicationRecord
     file.blob.content_type
   end
 
+  def file_byte_size
+    return nil unless file&.attached?
+
+    file.blob.byte_size
+  end
+
+  def file_filename
+    return nil unless file&.attached?
+
+    file.blob.filename.to_s
+  end
+
   def file_suppressed? = file_suppressed_at.present?
 
   def snapshot_export_paths

backend/app/representations/material_repr.rb

@@ -17,6 +17,11 @@ module MaterialRepr
                 Rails.application.routes.url_helpers.rails_storage_proxy_url(
                     material.file, host:)
               end,
+        thumbnail: thumbnail_url(material, host:),
+        thumbnail_fallback_text: thumbnail_fallback_text(material),
+        thumbnail_fallback_kind: thumbnail_fallback_kind(material),
+        media_kind: media_kind(material),
+        file_byte_size: material.file_byte_size,
         export_paths: export_paths(material),
         export_items: export_items(material))
   end
@@ -25,6 +30,28 @@ module MaterialRepr
     materials.map { |m| base(m, host:) }
   end
 
+  def list material, host:
+    { id: material.id,
+      version_no: material.version_no,
+      url: material.url,
+      tag: compact_tag(material.tag),
+      thumbnail: thumbnail_url(material, host:),
+      thumbnail_fallback_text: thumbnail_fallback_text(material),
+      thumbnail_fallback_kind: thumbnail_fallback_kind(material),
+      media_kind: media_kind(material),
+      content_type: material.content_type,
+      file_byte_size: material.file_byte_size,
+      file_suppressed_at: material.file_suppressed_at,
+      created_at: material.created_at,
+      updated_at: material.updated_at,
+      export_paths: export_paths(material),
+      export_items: export_items(material) }
+  end
+
+  def list_many materials, host:
+    materials.map { |m| list(m, host:) }
+  end
+
   def export_paths material
     material.material_export_items.each_with_object({ }) do |item, hash|
       hash[item.profile] = item.enabled ? item.export_path : ''
@@ -39,4 +66,41 @@ module MaterialRepr
         enabled: item.enabled }
     end
   end
+
+  def thumbnail_url material, host:
+    return nil if material.file_suppressed?
+    return nil unless material.thumbnail.attached?
+
+    Rails.application.routes.url_helpers.rails_storage_proxy_url(
+        material.thumbnail, host:)
+  end
+
+  def thumbnail_fallback_text material
+    material.tag&.name || material.created_at&.strftime('%Y-%m-%d')
+  end
+
+  def thumbnail_fallback_kind material
+    material.tag.present? ? 'tag_name' : 'created_at'
+  end
+
+  def media_kind material
+    return 'suppressed' if material.file_suppressed?
+    return 'url_only' unless material.file.attached?
+
+    content_type = material.file.blob.content_type.to_s
+    return 'image' if content_type.start_with?('image/')
+    return 'video' if content_type.start_with?('video/')
+    return 'audio' if content_type.start_with?('audio/')
+
+    'file_other'
+  end
+
+  def compact_tag tag
+    return nil unless tag
+
+    { id: tag.id,
+      name: tag.name,
+      category: tag.category,
+      deprecated_at: tag.deprecated_at }
+  end
 end

backend/app/services/material_thumbnail_generator.rb

@@ -0,0 +1,86 @@
+# frozen_string_literal: true
+
+require 'mini_magick'
+require 'open3'
+require 'tempfile'
+
+
+class MaterialThumbnailGenerator
+  SIZE = '180x180'
+
+  class << self
+    def generate! material
+      new(material).generate!
+    rescue ActiveStorage::FileNotFoundError, ArgumentError, MiniMagick::Error => e
+      Rails.logger.warn("Material thumbnail generation skipped: #{ e.class }: #{ e.message }")
+      nil
+    end
+  end
+
+  def initialize material
+    @material = material
+  end
+
+  def generate!
+    @material.thumbnail.purge if @material.thumbnail.attached?
+    return unless @material.file.attached?
+    return unless image? || video?
+
+    @material.file.blob.open do |file|
+      thumbnail = image? ? image_thumbnail(file.path) : video_thumbnail(file.path)
+      attach_thumbnail(thumbnail) if thumbnail
+    end
+  end
+
+  private
+
+  def image? = content_type.start_with?('image/')
+
+  def video? = content_type.start_with?('video/')
+
+  def content_type = @material.file.blob.content_type.to_s
+
+  def image_thumbnail path
+    image = MiniMagick::Image.open(path)
+    image.resize(SIZE)
+    image.format('jpg')
+    image
+  end
+
+  def video_thumbnail path
+    [1, 0].each do |seconds|
+      tempfile = Tempfile.new(['material-thumbnail', '.jpg'])
+      tempfile.close
+      ok = extract_video_frame(path, tempfile.path, seconds)
+      next unless ok && File.size?(tempfile.path)
+
+      return image_thumbnail(tempfile.path)
+    ensure
+      tempfile&.unlink
+    end
+
+    nil
+  end
+
+  def extract_video_frame input_path, output_path, seconds
+    _stdout, stderr, status =
+        Open3.capture3('ffmpeg',
+                       '-y',
+                       '-ss', seconds.to_s,
+                       '-i', input_path,
+                       '-frames:v', '1',
+                       '-f', 'image2',
+                       output_path)
+    Rails.logger.warn("ffmpeg thumbnail failed: #{ stderr }") unless status.success?
+    status.success?
+  rescue Errno::ENOENT => e
+    Rails.logger.warn("ffmpeg unavailable for material thumbnail: #{ e.message }")
+    false
+  end
+
+  def attach_thumbnail image
+    @material.thumbnail.attach(io: File.open(image.path),
+                               filename: 'material-thumbnail.jpg',
+                               content_type: 'image/jpeg')
+  end
+end

frontend/src/components/MaterialSidebar.tsx

@@ -2,7 +2,6 @@ import { Fragment, useEffect, useRef, useState } from 'react'
 import { useQuery } from '@tanstack/react-query'
 import { useLocation, useNavigate } from 'react-router-dom'
 
-import PrefetchLink from '@/components/PrefetchLink'
 import TagLink from '@/components/TagLink'
 import SidebarComponent from '@/components/layout/SidebarComponent'
 import { materialsKeys } from '@/lib/queryKeys'
@@ -17,15 +16,13 @@ const FILTERS: MaterialFilter[] = ['present', 'missing', 'any']
 const FILTER_LABELS: Record<MaterialFilter, string> = {
     present: '素材あり',
     missing: '素材なし',
-    any:     'すべて',
+    any:     'すべて'}
-}
 
 
 const setChildrenById = (
     tags:     MaterialSidebarTag[],
     targetId: number,
-    children: MaterialSidebarTag[],
+    children: MaterialSidebarTag[]): MaterialSidebarTag[] => (
-): MaterialSidebarTag[] => (
     tags.map (tag => {
       if (tag.id === targetId)
 	return { ...tag, children }
@@ -39,8 +36,7 @@ const setChildrenById = (
 
 const materialPath = (
     tagName: string,
-    materialFilter: MaterialFilter,
+    materialFilter: MaterialFilter): string => `/materials?q=${ encodeURIComponent (tagName) }&material_filter=${ materialFilter }`
-): string => `/materials?tag=${ encodeURIComponent (tagName) }&material_filter=${ materialFilter }`
 
 
 const sidebarTagToTag = (tag: MaterialSidebarTag): Tag => ({
@@ -63,8 +59,7 @@ const updateMaterialFilterQuery = (
     pathname: string,
     locationSearch: string,
     navigate: ReturnType<typeof useNavigate>,
-    materialFilter: MaterialFilter,
+    materialFilter: MaterialFilter) => {
-) => {
     const qs = new URLSearchParams (locationSearch)
     qs.set ('material_filter', materialFilter)
     navigate (`${ pathname }${ qs.toString () ? `?${ qs.toString () }` : '' }`)
@@ -104,8 +99,7 @@ const MaterialTreeNode: FC<{
   const { data } = useQuery ({
       queryKey: materialsKeys.tree ({ parentId: tag.id, materialFilter }),
       queryFn:	() => fetchMaterialTagTree ({ parentId: tag.id, materialFilter }),
-      enabled:	open && tag.hasChildren && tag.children.length === 0,
+      enabled:	open && tag.hasChildren && tag.children.length === 0})
-  })
 
   useEffect (() => {
     if (open && data && tag.children.length === 0)
@@ -164,8 +158,7 @@ const MobileMaterialTreeNode: FC<{
   const { data } = useQuery ({
       queryKey: materialsKeys.tree ({ parentId: tag.id, materialFilter }),
       queryFn:  () => fetchMaterialTagTree ({ parentId: tag.id, materialFilter }),
-      enabled:  open && tag.hasChildren && tag.children.length === 0,
+      enabled:  open && tag.hasChildren && tag.children.length === 0})
-  })
 
   useEffect (() => {
     if (open && data && tag.children.length === 0)
@@ -233,8 +226,7 @@ const MaterialSidebar: FC = () => {
 
   const { data: rootTags = [], isLoading, isError } = useQuery ({
       queryKey: materialsKeys.tree ({ parentId: null, materialFilter }),
-      queryFn:  () => fetchMaterialTagTree ({ parentId: null, materialFilter }),
+      queryFn:  () => fetchMaterialTagTree ({ parentId: null, materialFilter })})
-  })
 
   useEffect (() => {
     setDesktopTags (rootTags)
@@ -279,14 +271,6 @@ const MaterialSidebar: FC = () => {
       <>
 	<div className="border-b bg-stone-50 p-3 dark:border-stone-700 dark:bg-stone-950
 			dark:text-stone-100 md:hidden">
-	  <div className="mb-3 flex items-center justify-between gap-3">
-	    <span className="text-sm font-medium text-stone-700 dark:text-stone-200">タグ一覧</span>
-	    <PrefetchLink
-		to={`/materials?unclassified=1&material_filter=${ materialFilter }`}
-		className="text-sm text-sky-700 underline underline-offset-2 dark:text-sky-300">
-	      未分類素材
-	    </PrefetchLink>
-	  </div>
 	  <MaterialFilterButtons
 	      materialFilter={materialFilter}
 	      onChange={handleFilterChange}/>
@@ -310,13 +294,6 @@ const MaterialSidebar: FC = () => {
 	      <MaterialFilterButtons
 		  materialFilter={materialFilter}
 		  onChange={handleFilterChange}/>
-	      <div>
-		<PrefetchLink
-		    to={`/materials?unclassified=1&material_filter=${ materialFilter }`}
-		    className="text-sm text-sky-700 underline underline-offset-2 dark:text-sky-300">
-		  未分類素材
-		</PrefetchLink>
-	      </div>
 	      {isLoading && (
 		  <p className="text-sm text-neutral-500 dark:text-stone-400">読込中……</p>)}
 	      {isError && (

frontend/src/components/NicoViewer.tsx

@@ -107,8 +107,7 @@ export default forwardRef ((props: Props, ref: ForwardedRef<NiconicoViewerHandle
     loadCompleteTimerRef.current = setTimeout (() => {
       onError?.({
 	  eventName: 'loadCompleteTimeout',
-	  reason:    'niconico video length was not reported by embed',
+	  reason:    'niconico video length was not reported by embed'})
-      })
     }, LOAD_COMPLETE_TIMEOUT_MS)
   }, [clearLoadCompleteTimer, onError])
 

frontend/src/components/PostOriginalCreatedTimeField.tsx

@@ -19,8 +19,7 @@ const PostOriginalCreatedTimeField: FC<Props> = (
       setOriginalCreatedFrom,
       originalCreatedBefore,
       setOriginalCreatedBefore,
-      errors }: Props,
+      errors }: Props) => (
-) => (
     <FormField label="オリジナルの作成日時" messages={errors}>
       {({ describedBy, invalid }) => (
 	  <>

frontend/src/components/TagDetailSidebar.tsx

@@ -37,8 +37,7 @@ const renderTagTree = (
     path:             string,
     suppressClickRef: MutableRefObject<boolean>,
     parentTagId?:     number,
-    sp?:              boolean,
+    sp?:              boolean): ReactNode[] => {
-): ReactNode[] => {
   const key = `${ path }-${ tag.id }`
 
   const self = (
@@ -64,8 +63,7 @@ const renderTagTree = (
 
 const isDescendant = (
     root:     Tag,
-    targetId: number,
+    targetId: number): boolean => {
-): boolean => {
   if (!(root.children))
     return false
 
@@ -83,8 +81,7 @@ const isDescendant = (
 
 const findTag = (
     byCat:  TagByCategory,
-    id:     number,
+    id:     number): Tag | undefined => {
-): Tag | undefined => {
   const walk = (nodes: Tag[]): Tag | undefined => {
     for (const t of nodes)
       {
@@ -130,8 +127,7 @@ const buildTagByCategory = (post: Post): TagByCategory => {
 
 const changeCategory = async (
     tagId:    number,
-    category: Category,
+    category: Category): Promise<void> => {
-): Promise<void> => {
   await apiPatch (`/tags/${ tagId }`, { category })
 }
 
@@ -294,8 +290,7 @@ const TagDetailSidebar: FC<Props> = ({ post, sp }) => {
 	      addEventListener ('click', e => {
 		e.preventDefault ()
 		e.stopPropagation ()
-		suppressClickRef.current = false
+		suppressClickRef.current = false}, { capture: true, once: true })
-	      }, { capture: true, once: true })
 	    }}
 	    onDragCancel={() => {
 	      setActiveTagId (null)

frontend/src/components/common/Pagination.tsx

@@ -16,8 +16,7 @@ const range = (start: number, end: number): number[] =>
 const getPages = (
     page:         number,
     total:        number,
-    siblingCount: number,
+    siblingCount: number): (number | '…')[] => {
-): (number | '…')[] => {
   if (total <= 1)
     return [1]
 

frontend/src/components/dialogues/DialogueProvider.tsx

@@ -103,8 +103,7 @@ const DialogueProvider: FC<Props> = ({ children }) => {
       choice: options => new Promise (resolve => {
 	push ({ kind: 'choice',
 		options: options as ChoiceOptions<string>,
-		resolve: resolve as (value: string | null) => void })
+		resolve: resolve as (value: string | null) => void })}) }), [push])
-      }) }), [push])
 
   const active = queue[0]
 

frontend/src/components/ui/button.tsx

@@ -10,8 +10,7 @@ const buttonVariants = cva (
     'rounded-md text-sm font-medium transition-colors',
     'focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-slate-400',
     'disabled:pointer-events-none disabled:opacity-50',
-    '[&_svg]:pointer-events-none [&_svg]:size-4 [&_svg]:shrink-0',
+    '[&_svg]:pointer-events-none [&_svg]:size-4 [&_svg]:shrink-0'].join (' '),
-  ].join (' '),
   {
     variants: {
       variant: {
@@ -31,20 +30,15 @@ const buttonVariants = cva (
 	  'text-slate-900 hover:bg-slate-100 dark:text-slate-100 dark:hover:bg-slate-800',
 
 	link:
-          'text-blue-700 underline-offset-4 hover:underline dark:text-blue-300',
+	  'text-blue-700 underline-offset-4 hover:underline dark:text-blue-300'},
-      },
       size: {
 	default: 'h-10 px-4 py-2',
 	sm:      'h-9 rounded-md px-3',
 	lg:      'h-11 rounded-md px-8',
-        icon:    'h-10 w-10',
+	icon:    'h-10 w-10'}},
-      },
-    },
     defaultVariants: {
       variant: 'default',
-      size:    'default',
+      size:    'default'}})
-    },
-  })
 
 export interface ButtonProps
   extends React.ButtonHTMLAttributes<HTMLButtonElement>,
@@ -60,10 +54,8 @@ const Button = React.forwardRef<HTMLButtonElement, ButtonProps>(
 	className={cn(buttonVariants({ variant, size, className }))}
 	ref={ref}
 	{...props}
-      />
+      />)
-    )
+  })
-  }
-)
 Button.displayName = "Button"
 
 export { Button, buttonVariants }

frontend/src/components/ui/dialog.tsx

@@ -22,11 +22,9 @@ const DialogOverlay = React.forwardRef<
     ref={ref}
     className={cn(
       "fixed inset-0 z-50 bg-black/80 data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0",
-      className
+      className)}
-    )}
     {...props}
-  />
+  />))
-))
 DialogOverlay.displayName = DialogPrimitive.Overlay.displayName
 
 const DialogContent = React.forwardRef<
@@ -62,8 +60,7 @@ const DialogContent = React.forwardRef<
 	<span className="sr-only">閉ぢる</span>
       </DialogPrimitive.Close>
     </DialogPrimitive.Content>
-  </DialogPortal>
+  </DialogPortal>))
-))
 DialogContent.displayName = DialogPrimitive.Content.displayName
 
 const DialogHeader = ({
@@ -73,11 +70,9 @@ const DialogHeader = ({
   <div
     className={cn(
       "flex flex-col space-y-1.5 text-center sm:text-left",
-      className
+      className)}
-    )}
     {...props}
-  />
+  />)
-)
 DialogHeader.displayName = "DialogHeader"
 
 const DialogFooter = ({
@@ -87,11 +82,9 @@ const DialogFooter = ({
   <div
     className={cn(
       "flex flex-col-reverse sm:flex-row sm:justify-end sm:space-x-2",
-      className
+      className)}
-    )}
     {...props}
-  />
+  />)
-)
 DialogFooter.displayName = "DialogFooter"
 
 const DialogTitle = React.forwardRef<
@@ -102,11 +95,9 @@ const DialogTitle = React.forwardRef<
     ref={ref}
     className={cn(
       "text-lg font-semibold leading-none tracking-tight",
-      className
+      className)}
-    )}
     {...props}
-  />
+  />))
-))
 DialogTitle.displayName = DialogPrimitive.Title.displayName
 
 const DialogDescription = React.forwardRef<
@@ -117,8 +108,7 @@ const DialogDescription = React.forwardRef<
     ref={ref}
     className={cn("text-sm text-muted-foreground", className)}
     {...props}
-  />
+  />))
-))
 DialogDescription.displayName = DialogPrimitive.Description.displayName
 
 export {

frontend/src/components/ui/input.tsx

@@ -9,14 +9,11 @@ const Input = React.forwardRef<HTMLInputElement, React.ComponentProps<"input">>(
 	type={type}
 	className={cn(
 	  "flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-base ring-offset-background file:border-0 file:bg-transparent file:text-sm file:font-medium file:text-foreground placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50 md:text-sm",
-          className
+	  className
-        )}
 )}
 	ref={ref}
-      />
+	{...props}
-    )
+      />
-  }
-)
 )
   }
 )

frontend/src/components/ui/switch.tsx

@@ -12,18 +12,15 @@ const Switch = React.forwardRef<
   <SwitchPrimitives.Root
     className={cn(
       "peer inline-flex h-6 w-11 shrink-0 cursor-pointer items-center rounded-full border-2 border-transparent transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 focus-visible:ring-offset-background disabled:cursor-not-allowed disabled:opacity-50 data-[state=checked]:bg-primary data-[state=unchecked]:bg-input",
-      className
+      className
-    )}
 )}
     {...props}
     ref={ref}
   >
     <SwitchPrimitives.Thumb
-        "pointer-events-none block h-5 w-5 rounded-full bg-background shadow-lg ring-0 transition-transform data-[state=checked]:translate-x-5 data-[state=unchecked]:translate-x-0"
+      className={cn(
-      )}
 	"pointer-events-none block h-5 w-5 rounded-full bg-background shadow-lg ring-0 transition-transform data-[state=checked]:translate-x-5 data-[state=unchecked]:translate-x-0"
-  </SwitchPrimitives.Root>
+)}
-))
     />
   </SwitchPrimitives.Root>
 ))

frontend/src/components/ui/toast.tsx

@@ -17,11 +17,9 @@ const ToastViewport = React.forwardRef<
     ref={ref}
     className={cn(
       "fixed top-0 z-[100] flex max-h-screen w-full flex-col-reverse p-4 sm:bottom-0 sm:right-0 sm:top-auto sm:flex-col md:max-w-[420px]",
-      className
+      className
-    )}
 )}
-  />
+    {...props}
-))
   />
 ))
 ToastViewport.displayName = ToastPrimitives.Viewport.displayName
@@ -34,11 +32,7 @@ const toastVariants = cva(
 	default: "border bg-background text-foreground",
 	destructive:
 	  "destructive group border-destructive bg-destructive text-destructive-foreground",
-    defaultVariants: {
+      },
-      variant: "default",
-    },
-  }
-)
     },
     defaultVariants: { variant: "default" } }
 )
@@ -50,9 +44,7 @@ const Toast = React.forwardRef<
 >(({ className, variant, ...props }, ref) => {
   return (
     <ToastPrimitives.Root
-    />
+      ref={ref}
-  )
-})
       className={cn(toastVariants({ variant }), className)}
       {...props}
     />
@@ -63,11 +55,9 @@ const ToastAction = React.forwardRef<
 const ToastAction = React.forwardRef<
   React.ElementRef<typeof ToastPrimitives.Action>,
   React.ComponentPropsWithoutRef<typeof ToastPrimitives.Action>
-      className
+>(({ className, ...props }, ref) => (
-    )}
   <ToastPrimitives.Action
-  />
+    ref={ref}
-))
     className={cn(
       "inline-flex h-8 shrink-0 items-center justify-center rounded-md border bg-transparent px-3 text-sm font-medium ring-offset-background transition-colors hover:bg-secondary focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-2 disabled:pointer-events-none disabled:opacity-50 group-[.destructive]:border-muted/40 group-[.destructive]:hover:border-destructive/30 group-[.destructive]:hover:bg-destructive group-[.destructive]:hover:text-destructive-foreground group-[.destructive]:focus:ring-destructive",
       className
@@ -78,14 +68,12 @@ const ToastClose = React.forwardRef<
 ToastAction.displayName = ToastPrimitives.Action.displayName
 
 const ToastClose = React.forwardRef<
-      className
+  React.ElementRef<typeof ToastPrimitives.Close>,
-    )}
   React.ComponentPropsWithoutRef<typeof ToastPrimitives.Close>
 >(({ className, ...props }, ref) => (
   <ToastPrimitives.Close
     ref={ref}
-  </ToastPrimitives.Close>
+    className={cn(
-))
       "absolute right-2 top-2 rounded-md p-1 text-foreground/50 opacity-0 transition-opacity hover:text-foreground focus:opacity-100 focus:outline-none focus:ring-2 group-hover:opacity-100 group-[.destructive]:text-red-300 group-[.destructive]:hover:text-red-50 group-[.destructive]:focus:ring-red-400 group-[.destructive]:focus:ring-offset-red-600",
       className
 )}
@@ -96,8 +84,7 @@ const ToastTitle = React.forwardRef<
   </ToastPrimitives.Close>
 ))
 ToastClose.displayName = ToastPrimitives.Close.displayName
-  />
+
-))
 const ToastTitle = React.forwardRef<
   React.ElementRef<typeof ToastPrimitives.Title>,
   React.ComponentPropsWithoutRef<typeof ToastPrimitives.Title>
@@ -108,8 +95,7 @@ const ToastDescription = React.forwardRef<
     {...props}
   />
 ))
-  />
+ToastTitle.displayName = ToastPrimitives.Title.displayName
-))
 
 const ToastDescription = React.forwardRef<
   React.ElementRef<typeof ToastPrimitives.Description>,

frontend/src/components/ui/toaster.tsx

@@ -26,6 +26,5 @@ export const Toaster = () => {
 	    <ToastClose />
 	  </Toast>))}
       <ToastViewport />
-    </ToastProvider>
+    </ToastProvider>
-  )
 )

frontend/src/components/ui/use-toast.tsx

@@ -58,8 +58,7 @@ const addToRemoveQueue = (toastId: string) => {
     toastTimeouts.delete(toastId)
     dispatch({
       type: "REMOVE_TOAST",
-      toastId: toastId,
+      toastId: toastId})
-    })
   }, TOAST_REMOVE_DELAY)
 
   toastTimeouts.set(toastId, timeout)
@@ -70,16 +69,13 @@ export const reducer = (state: State, action: Action): State => {
     case "ADD_TOAST":
       return {
 	...state,
-        toasts: [action.toast, ...state.toasts].slice(0, TOAST_LIMIT),
+	toasts: [action.toast, ...state.toasts].slice(0, TOAST_LIMIT)}
-      }
 
     case "UPDATE_TOAST":
       return {
 	...state,
 	toasts: state.toasts.map((t) =>
-          t.id === action.toast.id ? { ...t, ...action.toast } : t
+	  t.id === action.toast.id ? { ...t, ...action.toast } : t)}
-        ),
-      }
 
     case "DISMISS_TOAST": {
       const { toastId } = action
@@ -100,23 +96,18 @@ export const reducer = (state: State, action: Action): State => {
 	  t.id === toastId || toastId === undefined
 	    ? {
 		...t,
-                open: false,
+		open: false}
-              }
+	    : t)}
-            : t
-        ),
-      }
     }
     case "REMOVE_TOAST":
       if (action.toastId === undefined) {
 	return {
 	  ...state,
-          toasts: [],
+	  toasts: []}
-        }
       }
       return {
 	...state,
-        toasts: state.toasts.filter((t) => t.id !== action.toastId),
+	toasts: state.toasts.filter((t) => t.id !== action.toastId)}
-      }
   }
 }
 
@@ -139,8 +130,7 @@ function toast({ ...props }: Toast) {
   const update = (props: ToasterToast) =>
     dispatch({
       type: "UPDATE_TOAST",
-      toast: { ...props, id },
+      toast: { ...props, id }})
-    })
   const dismiss = () => dispatch({ type: "DISMISS_TOAST", toastId: id })
 
   dispatch({
@@ -151,15 +141,12 @@ function toast({ ...props }: Toast) {
       open: true,
       onOpenChange: (open) => {
 	if (!open) dismiss()
-      },
+      }}})
-    },
-  })
 
   return {
     id: id,
     dismiss,
-    update,
+    update}
-  }
 }
 
 function useToast() {
@@ -178,8 +165,7 @@ function useToast() {
   return {
     ...state,
     toast,
-    dismiss: (toastId?: string) => dispatch({ type: "DISMISS_TOAST", toastId }),
+    dismiss: (toastId?: string) => dispatch({ type: "DISMISS_TOAST", toastId })}
-  }
 }
 
 export { useToast, toast }

frontend/src/config.sample.ts

@@ -3,8 +3,7 @@ const ENV: string = 'development'
 
 const config = {
   API_BASE_URL: ENV === 'production' ? 'https://hub.nizika.monster/api' : 'http://localhost:3002',
-  SITE_TITLE:   'ぼざクリ タグ広場'
+  SITE_TITLE:   'ぼざクリ タグ広場'}
-}
 
 export const API_BASE_URL = config.API_BASE_URL
 export const SITE_TITLE = config.SITE_TITLE

frontend/src/consts.ts

@@ -10,8 +10,7 @@ export const CATEGORIES = [
     'general',
     'material',
     'meta',
-    'nico',
+    'nico'] as const
-    ] as const
 
 export const CATEGORY_NAMES: Record<Category, string> = {
     deerjikist: 'ニジラー',
@@ -20,16 +19,14 @@ export const CATEGORY_NAMES: Record<Category, string> = {
     general:    '一般',
     material:   '素材',
     meta:       'メタタグ',
-    nico:       'ニコニコタグ',
+    nico:       'ニコニコタグ'} as const
-    } as const
 
 export const FETCH_POSTS_ORDER_FIELDS = [
     'title',
     'url',
     'original_created_at',
     'created_at',
-    'updated_at',
+    'updated_at'] as const
-    ] as const
 
 export const PLATFORMS = ['nico', 'youtube'] as const
 
@@ -43,13 +40,11 @@ export const TAG_COLOUR = {
     general:    'cyan',
     material:   'orange',
     meta:       'yellow',
-    nico:       'gray',
+    nico:       'gray'} as const satisfies Record<Category, string>
-    } as const satisfies Record<Category, string>
 
 export const USER_ROLES = ['admin', 'member', 'guest'] as const
 
 export const ViewFlagBehavior = {
     OnShowedDetail: 1,
     OnClickedLink:  2,
-    NotAuto:        3,
+    NotAuto:        3} as const
-    } as const

frontend/src/lib/api.ts

@@ -23,8 +23,7 @@ const apiP = async <T> (
     method: 'post' | 'put' | 'patch',
     path:   string,
     body?:  unknown,
-    opt?:   Opt,
+    opt?:   Opt): Promise<T> => {
-): Promise<T> => {
   const res = await client[method] (path, body ?? { }, withUserCode (opt))
   if (opt?.responseType === 'blob')
     return res.data as T
@@ -34,8 +33,7 @@ const apiP = async <T> (
 
 export const apiGet = async <T> (
     path: string,
-    opt?: Opt,
+    opt?: Opt): Promise<T> => {
-): Promise<T> => {
   const res = await client.get (path, withUserCode (opt))
   if (opt?.responseType === 'blob')
     return res.data as T
@@ -46,28 +44,24 @@ export const apiGet = async <T> (
 export const apiPost = async <T> (
     path:   string,
     body?:  unknown,
-    opt?:   Opt,
+    opt?:   Opt): Promise<T> => apiP ('post', path, body, opt)
-): Promise<T> => apiP ('post', path, body, opt)
 
 
 export const apiPut = async <T> (
     path:   string,
     body?:  unknown,
-    opt?:   Opt,
+    opt?:   Opt): Promise<T> => apiP ('put', path, body, opt)
-): Promise<T> => apiP ('put', path, body, opt)
 
 
 export const apiPatch = async <T> (
     path:   string,
     body?:  unknown,
-    opt?:   Opt,
+    opt?:   Opt): Promise<T> => apiP ('patch', path, body, opt)
-): Promise<T> => apiP ('patch', path, body, opt)
 
 
 export const apiDelete = async <T = void> (
     path: string,
-    opt?: Opt,
+    opt?: Opt): Promise<T> => {
-): Promise<T> => {
   const res = await client.delete (path, withUserCode (opt))
   if (res.data == null || res.data === '')
     return undefined as T

frontend/src/lib/gekanator.ts

@@ -104,8 +104,7 @@ export type BuildGekanatorQuestionsOptions = {
 
 
 export const normalizeTitleLengthCondition = (
-    condition:  GekanatorQuestionCondition,
+    condition:  GekanatorQuestionCondition): GekanatorQuestionCondition => {
-): GekanatorQuestionCondition => {
   switch (condition.type)
   {
   case 'title-length-greater-than':
@@ -119,8 +118,7 @@ export const normalizeTitleLengthCondition = (
 
 
 export const titleLengthMinimumForCondition = (
-    condition:  GekanatorQuestionCondition,
+    condition:  GekanatorQuestionCondition): number | null => {
-): number | null => {
   switch (condition.type)
   {
   case 'title-length-at-least':
@@ -134,8 +132,7 @@ export const titleLengthMinimumForCondition = (
 
 
 export const questionIdForCondition = (
-    condition:  NonPostSimilarityCondition,
+    condition:  NonPostSimilarityCondition): string => {
-): string => {
   switch (condition.type)
   {
   case 'tag':
@@ -161,8 +158,7 @@ export const questionIdForCondition = (
 
 const directExampleAnswerFor = (
     question:  StoredGekanatorQuestion,
-    post:      Post,
+    post:      Post): GekanatorAnswerValue | null => {
-): GekanatorAnswerValue | null => {
   if (question.kind !== 'post_similarity' && question.kind !== 'tag')
     return null
 
@@ -178,15 +174,13 @@ const directExampleAnswerFor = (
 
 
 export const isLearnedSemanticQuestion = (
-    question:  StoredGekanatorQuestion | GekanatorQuestion,
+    question:  StoredGekanatorQuestion | GekanatorQuestion): boolean =>
-): boolean =>
     question.kind === 'post_similarity'
     && question.source === 'user_suggested'
 
 
 export const learnedSemanticSideForAnswer = (
-    answer:  GekanatorAnswerValue | null,
+    answer:  GekanatorAnswerValue | null): LearnedSemanticSide => {
-): LearnedSemanticSide => {
   if (answer === 'yes' || answer === 'partial')
     return 'positive'
 
@@ -314,8 +308,7 @@ const questionableTag = (post: Post, key: string): boolean => {
 
 const questionMatches = (
     post:       Post,
-    question:   StoredGekanatorQuestion,
+    question:   StoredGekanatorQuestion): boolean => {
-): boolean => {
   const directAnswer = directExampleAnswerFor (question, post)
   if (directAnswer)
     return question.kind === 'post_similarity'
@@ -350,8 +343,7 @@ const questionMatches = (
 
 export const expectedAnswerForQuestion = (
     question:  StoredGekanatorQuestion | GekanatorQuestion | undefined,
-    post:      Post | null,
+    post:      Post | null): GekanatorAnswerValue | null => {
-): GekanatorAnswerValue | null => {
   if (!(question) || !(post))
     return null
 
@@ -382,14 +374,12 @@ export const expectedAnswerForQuestion = (
 
 export const learnedSemanticSideForPost = (
     question:  StoredGekanatorQuestion | GekanatorQuestion | undefined,
-    post:      Post | null,
+    post:      Post | null): LearnedSemanticSide =>
-): LearnedSemanticSide =>
     learnedSemanticSideForAnswer (expectedAnswerForQuestion (question, post))
 
 
 export const restoreGekanatorQuestion = (
-    question:  StoredGekanatorQuestion,
+    question:  StoredGekanatorQuestion): GekanatorQuestion => {
-): GekanatorQuestion => {
   const normalizedCondition = normalizeTitleLengthCondition (question.condition)
   const normalizedQuestion = {
       ...question,
@@ -408,8 +398,7 @@ export const restoreGekanatorQuestion = (
 
 
 export const storeGekanatorQuestion = (
-    question:  GekanatorQuestion,
+    question:  GekanatorQuestion): StoredGekanatorQuestion => ({
-): StoredGekanatorQuestion => ({
   id: question.condition.type === 'title-length-greater-than'
       ? `title:length-at-least:${ question.condition.length + 1 }`
       : question.id,
@@ -436,8 +425,7 @@ export const fetchGekanatorQuestions = async (): Promise<StoredGekanatorQuestion
 
 export const fetchGekanatorExtraQuestions = async (
     gameId:  number,
-    nonce?: string,
+    nonce?: string): Promise<GekanatorExtraQuestion[]> => {
-): Promise<GekanatorExtraQuestion[]> => {
   const data = await apiGet<{ questions: GekanatorExtraQuestion[] }> (
       `/gekanator/games/${ gameId }/extra_questions`,
       { params: nonce ? { nonce } : undefined })
@@ -447,8 +435,7 @@ export const fetchGekanatorExtraQuestions = async (
 
 export const buildGekanatorQuestions = (
     posts:    Post[],
-    options:  BuildGekanatorQuestionsOptions = { },
+    options:  BuildGekanatorQuestionsOptions = { }): GekanatorQuestion[] => {
-): GekanatorQuestion[] => {
   const {
       includeTitleContains = true,
       tagQuestionCap = 192,
@@ -490,8 +477,7 @@ export const buildGekanatorQuestions = (
 
   const usefulEntries = <T extends string | number> (
       counts:  Map<T, number>,
-      cap:     number,
+      cap:     number) =>
-  ) =>
       [...counts.entries ()]
       .filter (([, count]) => count > 0 && count < posts.length)
       .sort ((a, b) => Math.abs (posts.length / 2 - a[1])

frontend/src/lib/gekanatorCandidateRecovery.ts

@@ -32,8 +32,7 @@ export const candidatePostsFor = (
 				   answers:                 GekanatorAnswerLog[]
 				   softenedQuestionIds:     Set<string>
 				   rejectedPostIds:         Set<number>
-				   recoveredCandidatePosts: Map<number, RecoveredCandidateState> },
+				   recoveredCandidatePosts: Map<number, RecoveredCandidateState> }): Post[] => {
-): Post[] => {
   const questionById = new Map (questions.map (question => [question.id, question]))
 
   return posts.filter (post => {
@@ -76,8 +75,7 @@ export const candidatePostsFor = (
 export const hardFilteredPostsForAnswer = (
     { posts, question, answer }: { posts:     Post[]
 				   question:  GekanatorQuestion
-				   answer:    GekanatorAnswerValue },
+				   answer:    GekanatorAnswerValue }): Post[] => {
-): Post[] => {
   if (!(questionSupportsAnswerBasedHardFiltering (question)))
     return posts
 
@@ -98,8 +96,7 @@ const concreteAnswerOptions: GekanatorAnswerValue[] = ['yes', 'no', 'partial', '
 
 export const allConcreteAnswerOptionsExhausted = (
     posts:      Post[],
-    question:   GekanatorQuestion | null,
+    question:   GekanatorQuestion | null): boolean => {
-): boolean => {
   if (!(question))
     return false
 
@@ -125,8 +122,7 @@ export const recoverCandidatePosts = (
 			     recoveredCandidatePosts: Map<number, RecoveredCandidateState>
 			     eligiblePostIds:         Set<number>
 			     answerCountAtRecovery:   number
-			     recoveryStepCount:       number },
+			     recoveryStepCount:       number }): { recoveredCandidatePosts: Map<number, RecoveredCandidateState>
-): { recoveredCandidatePosts: Map<number, RecoveredCandidateState>
      recoveryStepCount:       number } | null => {
   const recovered = new Map (recoveredCandidatePosts)
   const targetSize = nextRecoveryTargetSize (recoveryStepCount)

frontend/src/lib/gekanatorQuestionFilters.ts

@@ -8,8 +8,7 @@ import type {
 
 
 export const monthForCondition = (
-    condition:  GekanatorQuestion['condition'],
+    condition:  GekanatorQuestion['condition']): number | null => {
-): number | null => {
   if (condition.type === 'original-month')
     return condition.month
 
@@ -24,8 +23,7 @@ export const monthForCondition = (
 const isTitleLengthContradiction = (
     candidate:  GekanatorQuestion['condition'],
     previous:   GekanatorQuestion['condition'],
-    answer:     GekanatorAnswerValue,
+    answer:     GekanatorAnswerValue): boolean => {
-): boolean => {
   const candidateLength = titleLengthMinimumForCondition (candidate)
   const previousLength = titleLengthMinimumForCondition (previous)
   if (candidateLength === null || previousLength === null)
@@ -45,8 +43,7 @@ const isTitleLengthContradiction = (
 
 const isQuestionRedundantAfterAnswers = (
     question:  GekanatorQuestion,
-    answers:   GekanatorAnswerLog[],
+    answers:   GekanatorAnswerLog[]): boolean => answers.some (answer => {
-): boolean => answers.some (answer => {
   const previous = answer.questionCondition
   return previous !== undefined
       && isTitleLengthContradiction (question.condition, previous, answer.answer)
@@ -56,8 +53,7 @@ const isQuestionRedundantAfterAnswers = (
 const isSourceFactBlocked = (
     candidate:  GekanatorQuestion['condition'],
     previous:   GekanatorQuestion['condition'],
-    answer:     GekanatorAnswerValue,
+    answer:     GekanatorAnswerValue): boolean => {
-): boolean => {
   if (candidate.type !== 'source' || previous.type !== 'source')
     return false
 
@@ -76,8 +72,7 @@ const isSourceFactBlocked = (
 const isOriginalYearFactBlocked = (
     candidate:  GekanatorQuestion['condition'],
     previous:   GekanatorQuestion['condition'],
-    answer:     GekanatorAnswerValue,
+    answer:     GekanatorAnswerValue): boolean => {
-): boolean => {
   if (candidate.type !== 'original-year' || previous.type !== 'original-year')
     return false
 
@@ -96,8 +91,7 @@ const isOriginalYearFactBlocked = (
 const isOriginalMonthFactBlocked = (
     candidate:  GekanatorQuestion['condition'],
     previous:   GekanatorQuestion['condition'],
-    answer:     GekanatorAnswerValue,
+    answer:     GekanatorAnswerValue): boolean => {
-): boolean => {
   switch (answer)
   {
   case 'yes':
@@ -143,8 +137,7 @@ const isOriginalMonthFactBlocked = (
 const isFactQuestionBlocked = (
     candidate:  GekanatorQuestion['condition'],
     previous:   GekanatorQuestion['condition'],
-    answer:     GekanatorAnswerValue,
+    answer:     GekanatorAnswerValue): boolean => {
-): boolean => {
   if (!(answer === 'yes' || answer === 'no'))
     return false
 
@@ -156,8 +149,7 @@ const isFactQuestionBlocked = (
 
 export const isQuestionHardFilteredAfterAnswers = (
     question:  GekanatorQuestion,
-    answers:   GekanatorAnswerLog[],
+    answers:   GekanatorAnswerLog[]): boolean => answers.some (answer => {
-): boolean => answers.some (answer => {
   const previous = answer.questionCondition
   if (previous === undefined)
     return false

frontend/src/lib/materials.ts

@@ -8,19 +8,12 @@ import {
 
 import type {
     Material,
+    FetchMaterialsParams,
     MaterialFilter,
     MaterialSidebarTag,
     MaterialTagTree,
 } from '@/types'
 
-export type FetchMaterialsParams = {
-    page?:         number
-    limit?:        number
-    tagId?:        number | null
-    parentId?:     number | null
-    unclassified?: boolean
-}
-
 export type FetchMaterialTreeParams = {
     parentId?:       number | null
     materialFilter:  MaterialFilter
@@ -36,23 +29,28 @@ const MATERIAL_FILTERS: MaterialFilter[] = ['present', 'missing', 'any']
 
 export const parseMaterialFilter = (
     value: unknown,
-    fallback: MaterialFilter = 'present',
+    fallback: MaterialFilter = 'present'): MaterialFilter =>
-): MaterialFilter =>
     typeof value === 'string' && MATERIAL_FILTERS.includes (value as MaterialFilter)
     ? value as MaterialFilter
     : fallback
 
 
 export const fetchMaterials = async (
-    { page, limit, tagId, parentId, unclassified }: FetchMaterialsParams,
+    { q, tagState, mediaKind, suppression, createdFrom, createdTo,
-): Promise<MaterialIndexResponse> =>
+      updatedFrom, updatedTo, sort, direction, page, limit }: FetchMaterialsParams): Promise<MaterialIndexResponse> =>
     await apiGet ('/materials', { params: {
-        ...(page != null && { page }),
+	...(q && { q }),
-        ...(limit != null && { limit }),
+	tag_state:   tagState,
-        ...(tagId != null && { tag_id: tagId }),
+	media_kind:  mediaKind,
-        ...(parentId != null && { parent_id: parentId }),
+	suppression,
-        ...(unclassified && { unclassified: '1' }),
+	...(createdFrom && { created_from: createdFrom }),
-    } })
+	...(createdTo && { created_to: createdTo }),
+	...(updatedFrom && { updated_from: updatedFrom }),
+	...(updatedTo && { updated_to: updatedTo }),
+	sort,
+	direction,
+	page,
+	limit} })
 
 
 export const fetchMaterial = async (id: string): Promise<Material | null> => {
@@ -70,18 +68,15 @@ export const fetchMaterial = async (id: string): Promise<Material | null> => {
 
 
 export const fetchMaterialTagTree = async (
-    { parentId, materialFilter }: FetchMaterialTreeParams,
+    { parentId, materialFilter }: FetchMaterialTreeParams): Promise<MaterialSidebarTag[]> =>
-): Promise<MaterialSidebarTag[]> =>
     await apiGet ('/tags/with-depth', { params: {
 	...(parentId != null && { parent: String (parentId) }),
-        material_filter: materialFilter,
+	material_filter: materialFilter} })
-    } })
 
 
 export const fetchMaterialTagByName = async (
     name: string,
-    materialFilter: MaterialFilter,
+    materialFilter: MaterialFilter): Promise<MaterialTagTree | null> => {
-): Promise<MaterialTagTree | null> => {
   try
   {
     return await apiGet (`/tags/name/${ encodeURIComponent (name) }/materials`,
@@ -102,13 +97,11 @@ export const createMaterial = async (formData: FormData): Promise<Material> =>
 
 export const updateMaterial = async (
     id: string,
-    formData: FormData,
+    formData: FormData): Promise<Material> =>
-): Promise<Material> =>
     await apiPut (`/materials/${ id }`, formData)
 
 
 export const suppressMaterialFile = async (
     id: string,
-    payload: { reason: string; purge?: boolean },
+    payload: { reason: string; purge?: boolean }): Promise<Material> =>
-): Promise<Material> =>
     await apiPatch (`/materials/${ id }/suppress_file`, payload)

frontend/src/lib/posts.ts

@@ -5,8 +5,7 @@ import type { FetchPostsParams, Post, PostVersion } from '@/types'
 
 export const fetchPosts = async (
     { url, title, tags, match, createdFrom, createdTo, updatedFrom, updatedTo,
-      originalCreatedFrom, originalCreatedTo, page, limit, order }: FetchPostsParams,
+      originalCreatedFrom, originalCreatedTo, page, limit, order }: FetchPostsParams): Promise<{
-): Promise<{
     posts:  Post[]
     count:  number }> =>
 	await apiGet ('/posts', { params: {
@@ -33,8 +32,7 @@ export const fetchPostChanges = async (
 	post?:  string
 	tag?:   string
 	page:   number
-	limit:  number },
+	limit:  number }): Promise<{
-): Promise<{
     versions: PostVersion[]
     count:    number }> =>
 	await apiGet ('/posts/versions', { params: { ...(post && { post }),
@@ -52,8 +50,7 @@ export const updatePost = async (
     { baseVersionNo, force, merge }: {
 	baseVersionNo?: number
 	force?:         boolean
-	merge?:         boolean }
+	merge?:         boolean }) =>
-) =>
     await apiPut<Post> (
 	`/posts/${ post.id }`,
 	{ title: post.title,

frontend/src/lib/queryKeys.ts

@@ -1,5 +1,6 @@
 import type {
     FetchNicoTagsParams,
+    FetchMaterialsParams,
     FetchPostsParams,
     FetchTagsParams,
     MaterialFilter,
@@ -32,13 +33,7 @@ export const tagsKeys = {
 
 export const materialsKeys = {
     root:         ['materials'] as const,
-    index:        (p: {
+    index:        (p: FetchMaterialsParams) => ['materials', 'index', p] as const,
-        page?:         number
-        limit?:        number
-        tagId?:        number | null
-        parentId?:     number | null
-        unclassified?: boolean
-    }) => ['materials', 'index', p] as const,
     byTagName:     (name: string, materialFilter: MaterialFilter) =>
 		      ['materials', 'tag', name, materialFilter] as const,
     show:         (id: string) => ['materials', id] as const,
@@ -47,8 +42,7 @@ export const materialsKeys = {
 	materialFilter:  MaterialFilter
     }) => ['materials', 'tree', p] as const,
     unclassified: (p: { page?: number; limit?: number } = { }) =>
-		      ['materials', 'unclassified', p] as const,
+		      ['materials', 'unclassified', p] as const}
-}
 
 export const wikiKeys = {
     root:   ['wiki'] as const,

frontend/src/lib/tags.ts

@@ -11,8 +11,7 @@ import type { Deerjikist,
 export const fetchTags = async (
     { post, name, category, postCountGTE, postCountLTE, createdFrom, createdTo,
       updatedFrom, updatedTo, deprecated,
-      page, limit, order }: FetchTagsParams,
+      page, limit, order }: FetchTagsParams): Promise<{ tags:  Tag[]
-): Promise<{ tags:  Tag[]
 	     count: number }> =>
     await apiGet ('/tags', { params: {
 	...(post != null && { post }),
@@ -31,8 +30,7 @@ export const fetchTags = async (
 
 
 export const fetchNicoTags = async (
-    { name, linkedTag, linkStatus, page, limit, order }: FetchNicoTagsParams,
+    { name, linkedTag, linkStatus, page, limit, order }: FetchNicoTagsParams): Promise<{ tags:  NicoTag[]
-): Promise<{ tags:  NicoTag[]
 	     count: number }> =>
     await apiGet ('/tags/nico', { params: {
 	page,
@@ -70,14 +68,12 @@ export const fetchTagChanges = async (
     { id, page, limit }: {
 	id?:    string
 	page:   number
-	limit:  number },
+	limit:  number }): Promise<{
-): Promise<{
     versions: TagVersion[]
     count:    number }> =>
 	await apiGet ('/tags/versions', { params: { ...(id && { id }), page, limit } })
 
 
 export const fetchDeerjikistsByTag = async (
-    id: string,
+    id: string): Promise<{ tag: Tag; deerjikists: Deerjikist[] }> =>
-): Promise<{ tag: Tag; deerjikists: Deerjikist[]}> =>
     await apiGet (`/tags/${ id }/deerjikists`)

frontend/src/lib/users.ts

@@ -4,5 +4,4 @@ const CONTENT_EDITOR_ROLES: readonly UserRole[] = ['admin', 'member']
 
 
 export const canEditContent = (
-    user: Pick<User, 'role'> | null | undefined,
+    user: Pick<User, 'role'> | null | undefined): boolean => user != null && CONTENT_EDITOR_ROLES.includes (user.role)
-): boolean => user != null && CONTENT_EDITOR_ROLES.includes (user.role)

frontend/src/lib/utils.ts

@@ -12,8 +12,7 @@ export const cn = (...inputs: ClassValue[]) => twMerge (clsx (...inputs))
 
 export const dateString = (
     d:        string | Date,
-    unknown:  'month' | 'day' | 'hour' | 'minute' | 'second' | null = null,
+    unknown:  'month' | 'day' | 'hour' | 'minute' | 'second' | null = null): string =>
-): string =>
     toDate (d).toLocaleString (
 	'ja-JP-u-ca-japanese',
 	{ era: 'long',
@@ -28,8 +27,7 @@ export const dateString = (
 
 export const originalCreatedAtString = (
     f:  string | Date | null,
-    b:  string | Date | null,
+    b:  string | Date | null): string => {
-): string => {
   const from = f ? toDate (f) : null
   const before = b ? toDate (b) : null
 

frontend/src/lib/wiki.ts

@@ -4,22 +4,19 @@ import type { WikiPage } from '@/types'
 
 
 export const fetchWikiPages = async (
-    { title }:  { title?: string },
+    { title }:  { title?: string }): Promise<WikiPage[]> =>
-): Promise<WikiPage[]> =>
     await apiGet ('/wiki', { params: { title } })
 
 
 export const fetchWikiPage = async (
     id:           string,
-    { version }:  { version?: string },
+    { version }:  { version?: string }): Promise<WikiPage> =>
-): Promise<WikiPage> =>
     await apiGet (`/wiki/${ id }`, { params: version ? { version } : { } })
 
 
 export const fetchWikiPageByTitle = async (
     title:        string,
-    { version }:  { version?: string },
+    { version }:  { version?: string }): Promise<WikiPage | null> => {
-): Promise<WikiPage | null> => {
   try
   {
     return await apiGet (`/wiki/title/${ encodeURIComponent (title) }`, { params: { version } })

frontend/src/pages/GekanatorPage.tsx

@@ -238,8 +238,7 @@ const createGameSeed = (): string => {
 
 const normalizeStoredQuestionId = (
     questionId:  string,
-    condition?:  GekanatorQuestionCondition,
+    condition?:  GekanatorQuestionCondition): string => {
-): string => {
   if (condition?.type === 'title-length-greater-than')
     return `title:length-at-least:${ condition.length + 1 }`
 
@@ -312,8 +311,7 @@ const sourcePriorityForMerge = (question: GekanatorQuestion): number => {
 
 const shouldReplaceMergedQuestion = (
     current:    GekanatorQuestion | undefined,
-    candidate:  GekanatorQuestion,
+    candidate:  GekanatorQuestion): boolean => {
-): boolean => {
   if (!(current))
     return true
 
@@ -408,8 +406,7 @@ const loadRecentGames = (): RecentGameSummary[] => {
 
 
 const storeRecentGameSummary = (
-    summary:  RecentGameSummary,
+    summary:  RecentGameSummary): RecentGameSummary[] => {
-): RecentGameSummary[] => {
   const next =
       [summary,
        ...loadRecentGames ().filter (item => (item.savedAt !== summary.savedAt
@@ -459,8 +456,7 @@ const resettableExtraQuestionState = (): {
 
 const recoveredCandidateMapFromStored = (
     items:   RecoveredCandidatePost[],
-    scores:  [number, number][],
+    scores:  [number, number][]): Map<number, RecoveredCandidateState> => {
-): Map<number, RecoveredCandidateState> => {
   const storedScores = new Map (scores)
 
   return new Map (items.map (item => [item.postId, {
@@ -470,8 +466,7 @@ const recoveredCandidateMapFromStored = (
 
 
 const storedRecoveredCandidatesFromMap = (
-    recoveredCandidatePosts: Map<number, RecoveredCandidateState>,
+    recoveredCandidatePosts: Map<number, RecoveredCandidateState>): RecoveredCandidatePost[] =>
-): RecoveredCandidatePost[] =>
     [...recoveredCandidatePosts.entries ()]
     .map (([postId, recoveredCandidate]) => ({
 	postId,
@@ -513,8 +508,7 @@ const distributionEntropy = (weights: number[]): number =>
 const questionCategoryPenalty = (
     question:       GekanatorQuestion,
     answerCount:    number,
-    repeatPenalty:  number,
+    repeatPenalty:  number): number => {
-): number => {
   const earlyFactor = Math.max (0, (3 - answerCount) / 3)
   const titleLengthPenalty = (() => {
     if (titleLengthMinimumForCondition (question.condition) == null)
@@ -553,8 +547,7 @@ const relatedPostIdsOf = (post: Post): number[] => {
 
 const userPriorWeightsFor = (
     posts:        Post[],
-    recentGames:  RecentGameSummary[],
+    recentGames:  RecentGameSummary[]): Map<number, number> => {
-): Map<number, number> => {
   const postById = new Map (posts.map (post => [post.id, post]))
   const weights = new Map<number, number> ()
   const addWeight = (postId: number, weight: number) => {
@@ -581,14 +574,12 @@ const userPriorWeightsFor = (
 
 const answerWeightFor = (
     questionId:           string,
-    softenedQuestionIds:  Set<string>,
+    softenedQuestionIds:  Set<string>): number => softenedQuestionIds.has (questionId) ? softenedAnswerWeight : 1
-): number => softenedQuestionIds.has (questionId) ? softenedAnswerWeight : 1
 
 
 const scoreWeightForAnswer = (
     answer:               GekanatorAnswerLog,
-    softenedQuestionIds:  Set<string>,
+    softenedQuestionIds:  Set<string>): number =>
-): number =>
     answerWeightFor (answer.questionId, softenedQuestionIds)
     * (
 	answer.questionPurpose === 'learning_user_suggested'
@@ -638,8 +629,7 @@ const titleTermPattern =
 const addPostIdToIndex = <K extends string | number> (
     index:   Map<K, Set<number>>,
     key:     K,
-    postId:  number,
+    postId:  number) => {
-) => {
   const current = index.get (key)
   if (current)
     {
@@ -652,8 +642,7 @@ const addPostIdToIndex = <K extends string | number> (
 
 
 const buildMaterialIndex = (
-    posts:  Post[],
+    posts:  Post[]): GekanatorQuestionMaterialIndex => {
-): GekanatorQuestionMaterialIndex => {
   const postById = new Map<number, Post> ()
   const tagKeysByPostId = new Map<number, string[]> ()
   const postIdsByTagKey = new Map<string, Set<number>> ()
@@ -784,8 +773,7 @@ const originalDateQuestionTextFor = (
     condition:  Extract<
 	GekanatorQuestionCondition,
 	{ type: 'original-year' | 'original-month' | 'original-month-day' }
-    >,
+    >): string => {
-): string => {
   switch (condition.type)
   {
   case 'original-year':
@@ -852,8 +840,7 @@ const isLearnableTagKey = (key: string): boolean => !(key.startsWith ('nico:'))
 
 
 const isUserSuggestedLearnedSemanticQuestion = (
-    question:  GekanatorQuestion,
+    question:  GekanatorQuestion): boolean => isLearnedSemanticQuestion (question)
-): boolean => isLearnedSemanticQuestion (question)
 
 
 type LearnedSemanticCandidateStats = {
@@ -872,8 +859,7 @@ const learnedSemanticStatsForCandidateIds = (
       question }: {
 	candidateIds:  number[]
 	posts:         Post[]
-	question:      GekanatorQuestion },
+	question:      GekanatorQuestion }): LearnedSemanticCandidateStats => {
-): LearnedSemanticCandidateStats => {
   const candidateIdSet = new Set (candidateIds)
   const positiveIds = new Set<number> ()
   const negativeIds = new Set<number> ()
@@ -915,8 +901,7 @@ const learnedSemanticQuestionIsEffectiveForCandidateIds = (
       question }: {
 	candidateIds:  number[]
 	posts:         Post[]
-	question:      GekanatorQuestion },
+	question:      GekanatorQuestion }): boolean => {
-): boolean => {
   if (!(isUserSuggestedLearnedSemanticQuestion (question)))
     return false
 
@@ -936,8 +921,7 @@ const learnedSemanticQuestionIsEffectiveForCandidateIds = (
 
 const directSemanticAnswerForPost = (
     question:  GekanatorQuestion,
-    post:      Post,
+    post:      Post): GekanatorAnswerValue | null => {
-): GekanatorAnswerValue | null => {
   const direct = question.exampleAnswers?.[String (post.id) as `${ number }`]
   if (direct)
     return direct
@@ -956,8 +940,7 @@ const learnedSemanticLearningValueForTopPosts = (
 	question:      GekanatorQuestion
 	learningTargetPosts: Post[]
 	candidateIds:  number[]
-	posts:         Post[] },
+	posts:         Post[] }): { missingTopCount: number
-): { missingTopCount: number
      knownCount:      number
      hasLearningValue: boolean } => {
   const missingTopCount =
@@ -1000,8 +983,7 @@ const learningTargetPostsForCandidates = ({
 
 
 const questionPurposeCountsFor = (
-    answers:  GekanatorAnswerLog[],
+    answers:  GekanatorAnswerLog[]): {
-): {
     effectiveUserSuggestedCount: number
     learningUserSuggestedCount:  number
     normalQuestionCount:         number
@@ -1041,8 +1023,7 @@ const questionPurposeCountsFor = (
 
 const learnedSemanticNarrowPenaltyForStats = (
     candidateCount:  number,
-    stats:           LearnedSemanticCandidateStats,
+    stats:           LearnedSemanticCandidateStats): number => {
-): number => {
   const minSide = candidateCount < 10 ? 1 : Math.max (3, candidateCount * .08)
   return stats.positiveCount < minSide || stats.negativeCount < minSide ? .15 : 0
 }
@@ -1050,8 +1031,7 @@ const learnedSemanticNarrowPenaltyForStats = (
 
 const learnedSemanticScoreDeltaForExpectedAnswer = (
     userAnswer:      GekanatorAnswerValue,
-    expectedAnswer:  GekanatorAnswerValue | null,
+    expectedAnswer:  GekanatorAnswerValue | null): number => {
-): number => {
   switch (userAnswer)
   {
   case 'yes':
@@ -1089,8 +1069,7 @@ const learnedSemanticScoreDeltaForExpectedAnswer = (
 const scoreDropDeltaForRecoveredPost = (
     postId:                   number,
     totalScore:               number,
-    recoveredCandidatePosts:  Map<number, RecoveredCandidateState>,
+    recoveredCandidatePosts:  Map<number, RecoveredCandidateState>): number => {
-): number => {
   const recoveredCandidate = recoveredCandidatePosts.get (postId)
   if (recoveredCandidate == null)
     return totalScore
@@ -1114,8 +1093,7 @@ const postPassesScoreDrop = (
       recoveredCandidatePosts }: {
 	postId:                   number
 	scores:                   Map<number, number>
-	recoveredCandidatePosts:  Map<number, RecoveredCandidateState> },
+	recoveredCandidatePosts:  Map<number, RecoveredCandidateState> }): boolean => {
-): boolean => {
   if (!(activeCandidateScoreDropEnabled (scores)))
     return true
 
@@ -1129,8 +1107,7 @@ const postPassesScoreDrop = (
 
 // `post_similarities` is the score-propagation graph, not the question kind.
 const questionUsesPostSimilarityPropagationGraphForScoring = (
-    question:  GekanatorQuestion,
+    question:  GekanatorQuestion): boolean =>
-): boolean =>
     (question.kind === 'post_similarity'
      && !(isUserSuggestedLearnedSemanticQuestion (question)))
       || (question.kind === 'tag'
@@ -1139,8 +1116,7 @@ const questionUsesPostSimilarityPropagationGraphForScoring = (
 
 
 const questionSupportsAnswerBasedHardFiltering = (
-    question:  GekanatorQuestion,
+    question:  GekanatorQuestion): boolean => !(questionUsesPostSimilarityPropagationGraphForScoring (question))
-): boolean => !(questionUsesPostSimilarityPropagationGraphForScoring (question))
     && !(isUserSuggestedLearnedSemanticQuestion (question))
 
 
@@ -1160,8 +1136,7 @@ const usesLearnedTagExamples = (question: GekanatorQuestion): boolean =>
 
 const searchedQuestionsFor = (
     questions:  GekanatorQuestion[],
-    search:     string,
+    search:     string): GekanatorQuestion[] => {
-): GekanatorQuestion[] => {
   const needle = search.trim ()
   if (!(needle))
     return []
@@ -1235,8 +1210,7 @@ type QuestionMatchResolver = {
 
 const buildGekanatorMatchIndex = (
     posts:      Post[],
-    questions:  GekanatorQuestion[],
+    questions:  GekanatorQuestion[]): GekanatorMatchIndex => new Map (
-): GekanatorMatchIndex => new Map (
     questions.map (question => [
 	question.id,
 	new Set (
@@ -1285,8 +1259,7 @@ const matchingPostIdsForQuestion = ({
 
 
 const positiveMatchingPostIdsForQuestion = (
-    resolver:  QuestionMatchResolver,
+    resolver:  QuestionMatchResolver): Set<number> => {
-): Set<number> => {
   if (isUserSuggestedLearnedSemanticQuestion (resolver.question))
     {
       const cached = resolver.dynamicMatchIndex?.get (resolver.question.id)
@@ -1356,8 +1329,7 @@ const matchingWeightInCandidates = (
 			     materialIndex:       GekanatorQuestionMaterialIndex
 			     matchIndex:          GekanatorMatchIndex
 			     question:            GekanatorQuestion
-			     dynamicMatchIndex?:  GekanatorMatchIndex },
+			     dynamicMatchIndex?:  GekanatorMatchIndex }): number => {
-): number => {
   const matched = positiveMatchingPostIdsForQuestion ({
       posts,
       materialIndex,
@@ -1380,8 +1352,7 @@ const signatureForCandidateIds = (
 			      materialIndex:      GekanatorQuestionMaterialIndex
 			      matchIndex:         GekanatorMatchIndex
 			      question:           GekanatorQuestion
-			      dynamicMatchIndex?: GekanatorMatchIndex },
+			      dynamicMatchIndex?: GekanatorMatchIndex }): string => {
-): string => {
   if (isUserSuggestedLearnedSemanticQuestion (question))
     {
       const postById = new Map (posts.map (post => [post.id, post]))
@@ -1421,8 +1392,7 @@ const postIdsForHardAnswer = (
 			     posts:               Post[]
 			     materialIndex:       GekanatorQuestionMaterialIndex
 			     matchIndex:          GekanatorMatchIndex
-			     dynamicMatchIndex?:  GekanatorMatchIndex },
+			     dynamicMatchIndex?:  GekanatorMatchIndex }): number[] => {
-): number[] => {
   if (!(questionSupportsAnswerBasedHardFiltering (question)))
     return candidateIds
 
@@ -1562,8 +1532,7 @@ const buildIndexedQuestion = (
 	text:           string
 	kind:           GekanatorQuestionKind
 	priorityWeight: number
-	materialIndex:  GekanatorQuestionMaterialIndex },
+	materialIndex:  GekanatorQuestionMaterialIndex }): GekanatorQuestion => ({
-): GekanatorQuestion => ({
     id: questionIdForCondition (condition),
     text,
     kind,
@@ -1578,8 +1547,7 @@ const buildIndexedQuestion = (
 const rankedEntriesForCounts = <T extends string | number> (
     { counts, total, cap }: { counts:  Map<T, number>
 			      total:   number
-    			      cap:     number },
+    			      cap:     number }): [T, number][] =>
-): [T, number][] =>
     ([...counts.entries ()]
      .filter (([, count]) => count > 0 && count < total)
      .sort ((a, b) => Math.abs (total / 2 - a[1]) - Math.abs (total / 2 - b[1]))
@@ -1594,8 +1562,7 @@ const buildQuestionsForCandidateIds = (
 				     materialIndex:     GekanatorQuestionMaterialIndex
 				     acceptedQuestions: GekanatorQuestion[]
 				     mode?:            QuestionBuildMode
-				     confirmationPostId?: number | null },
+				     confirmationPostId?: number | null }): GekanatorQuestion[] => {
-): GekanatorQuestion[] => {
   const total = candidateIds.length
   const confirmationPost = (() => {
     if (confirmationPostId == null)
@@ -1652,8 +1619,7 @@ const buildQuestionsForCandidateIds = (
       condition: Extract<
 	  GekanatorQuestionCondition,
 	  { type: 'original-year' | 'original-month' | 'original-month-day' }
-      >,
+      >): GekanatorQuestion => {
-  ): GekanatorQuestion => {
     const priorityWeight = (() => {
       if (condition.type === 'original-year')
 	return 1.04
@@ -1673,8 +1639,7 @@ const buildQuestionsForCandidateIds = (
   const specialMonthDays = rankedEntriesForCounts ({
       counts: monthDayCounts,
       total,
-      cap: factCap
+      cap: factCap}).filter (([monthDay]) => specialOriginalMonthDayLabelFor (String (monthDay)) != null)
-  }).filter (([monthDay]) => specialOriginalMonthDayLabelFor (String (monthDay)) != null)
 
   if (mode === 'split')
     {
@@ -2124,8 +2089,7 @@ type ExclusiveConditionGroup =
 
 
 const exclusiveConditionGroupFor = (
-    condition:  GekanatorQuestion['condition'],
+    condition:  GekanatorQuestion['condition']): ExclusiveConditionGroup | null => {
-): ExclusiveConditionGroup | null => {
   switch (condition.type)
   {
   case 'original-month':
@@ -2144,8 +2108,7 @@ const exclusiveConditionGroupFor = (
 
 const sameConditionValue = (
     left:   GekanatorQuestion['condition'],
-    right:  GekanatorQuestion['condition'],
+    right:  GekanatorQuestion['condition']): boolean => {
-): boolean => {
   const leftTitleLength = titleLengthMinimumForCondition (left)
   const rightTitleLength = titleLengthMinimumForCondition (right)
   if (leftTitleLength != null || rightTitleLength != null)
@@ -2187,8 +2150,7 @@ const sameConditionValue = (
 
 const isMonthCrossMatch = (
     candidate:  GekanatorQuestion['condition'],
-    previous:   GekanatorQuestion['condition'],
+    previous:   GekanatorQuestion['condition']): boolean => {
-): boolean => {
   const candidateMonth = monthForCondition (candidate)
   const previousMonth = monthForCondition (previous)
   if (candidateMonth == null || previousMonth == null)
@@ -2204,8 +2166,7 @@ const isMonthCrossMatch = (
 
 const isExclusiveContradiction = (
     candidate:  GekanatorQuestion['condition'],
-    previous:   GekanatorQuestion['condition'],
+    previous:   GekanatorQuestion['condition']): boolean => {
-): boolean => {
   const candidateGroup = exclusiveConditionGroupFor (candidate)
   const previousGroup = exclusiveConditionGroupFor (previous)
 
@@ -2242,16 +2203,14 @@ const contradictionPenaltyFor = ({
     case 'no':
       if (
 	  sameConditionValue (question.condition, previous)
-	  || isMonthCrossMatch (question.condition, previous)
+	  || isMonthCrossMatch (question.condition, previous))
-      )
 	return sum + 40
 
       return sum
     case 'probably_no':
       if (
 	  sameConditionValue (question.condition, previous)
-	  || isMonthCrossMatch (question.condition, previous)
+	  || isMonthCrossMatch (question.condition, previous))
-      )
 	return sum + 20
 
       return sum
@@ -2281,8 +2240,7 @@ const chooseQuestion = (
 		      recentFirstQuestionPenaltyById: Map<string, number>
 		      userPriorWeights: Map<number, number>
 		      materialIndex: GekanatorQuestionMaterialIndex
-		      matchIndex: GekanatorMatchIndex },
+		      matchIndex: GekanatorMatchIndex }): QuestionSelection | null => {
-): QuestionSelection | null => {
   const dynamicMatchIndex = new Map<string, Set<number>> ()
 
   const invertedSignature = (signature: string): string =>
@@ -2327,8 +2285,7 @@ const chooseQuestion = (
   const rank = (
       questionsToRank:    GekanatorQuestion[],
       candidates:         { post: Post; score: number }[],
-      weightedCandidates: { post: Post; score: number; weight: number }[],
+      weightedCandidates: { post: Post; score: number; weight: number }[]) => {
-  ) => {
     const redundant = redundantSignatures (candidates.map (item => item.post))
     const candidateById = new Map (candidates.map (item => [item.post.id, item.post]))
     const candidateIds = candidates.map (item => item.post.id)
@@ -2613,8 +2570,7 @@ const chooseQuestion = (
   if (
 	effectiveRatio < targetEffectiveUserSuggestedQuestionRatio
 	&& totalUserSuggestedRatio < targetTotalUserSuggestedQuestionRatio
-	&& effectiveUserSuggestedPool.length > 0
+	&& effectiveUserSuggestedPool.length > 0)
-  )
     {
       selectedPool = effectiveUserSuggestedPool
       selectedPurpose = 'effective_user_suggested'
@@ -2622,8 +2578,7 @@ const chooseQuestion = (
   else if (
 	learningRatio < targetLearningUserSuggestedQuestionRatio
 	&& totalUserSuggestedRatio < targetTotalUserSuggestedQuestionRatio
-	&& learningUserSuggestedPool.length > 0
+	&& learningUserSuggestedPool.length > 0)
-  )
     {
       selectedPool = learningUserSuggestedPool
       selectedPurpose = 'learning_user_suggested'
@@ -2683,8 +2638,7 @@ const chooseQuestion = (
 
 
 const winningRunPriorityFor = (
-    expected:    GekanatorAnswerValue,
+    expected:    GekanatorAnswerValue): number | null => {
-): number | null => {
   if (expected === 'yes')
     return 0
   if (expected === 'partial')
@@ -2719,8 +2673,7 @@ const chooseWinningRunQuestion = ({
       materialIndex,
       acceptedQuestions,
       mode: 'confirmation',
-      confirmationPostId: targetPost.id
+      confirmationPostId: targetPost.id})
-  })
       .filter (question => {
 	if (askedIds.has (question.id))
 	  return false
@@ -2829,8 +2782,7 @@ const chooseFallbackQuestion = ({
 	  materialIndex,
 	  acceptedQuestions: [],
 	  mode: 'confirmation',
-	  confirmationPostId: post.id
+	  confirmationPostId: post.id})))
-      })))
       .slice (0, 32)
   const dynamicMatchIndex = new Map<string, Set<number>> ()
   const ranked = mergeQuestions ([
@@ -2905,8 +2857,7 @@ const chooseFallbackQuestion = ({
 
 
 const shouldEnterGuessPhase = (
-    reason: GuessReason | null,
+    reason: GuessReason | null): reason is 'hard_max_questions' | 'winning_run_finished' | 'question_count_checkpoint' =>
-): reason is 'hard_max_questions' | 'winning_run_finished' | 'question_count_checkpoint' =>
     (reason === 'hard_max_questions'
      || reason === 'winning_run_finished'
      || reason === 'question_count_checkpoint')
@@ -2914,15 +2865,13 @@ const shouldEnterGuessPhase = (
 
 const isWinningRunActive = (
     winningRunTargetId:         number | null,
-    winningRunStartAnswerCount: number | null,
+    winningRunStartAnswerCount: number | null): boolean =>
-): boolean =>
     winningRunTargetId != null && winningRunStartAnswerCount != null
 
 
 const winningRunQuestionCount = (
     answers:                    GekanatorAnswerLog[],
-    winningRunStartAnswerCount: number | null,
+    winningRunStartAnswerCount: number | null): number => {
-): number => {
   if (winningRunStartAnswerCount == null)
     return 0
 
@@ -2962,8 +2911,7 @@ const nextQuestionPlanFor = (
     				      matchIndex: GekanatorMatchIndex
     				      lastGuessQuestionCount: number
     				      winningRunTargetId: number | null
-    				      winningRunStartAnswerCount: number | null },
+    				      winningRunStartAnswerCount: number | null }): { question: GekanatorQuestion | null
-): { question: GekanatorQuestion | null
      guess: Post | null
      guessReason: GuessReason | null
      questionMode: QuestionMode
@@ -3013,8 +2961,7 @@ const nextQuestionPlanFor = (
     if (
 	isWinningRunActive (winningRunTargetId, winningRunStartAnswerCount)
 	&& winningRunTargetId === nextWinningRunTargetId
-	&& winningRunStartAnswerCount != null
+	&& winningRunStartAnswerCount != null)
-    )
       return winningRunStartAnswerCount
 
     return answers.length
@@ -3188,8 +3135,7 @@ const mascotStateFor = (
     resultWon:             boolean | null,
     eligiblePostCount:     number,
     bestConfidencePercent: number,
-    winningRunActive:      boolean,
+    winningRunActive:      boolean): MascotState => {
-): MascotState => {
   const resultPhase =
       phase === 'end'
       || phase === 'review'
@@ -3210,13 +3156,11 @@ const mascotStateFor = (
     if (
 	winningRunActive
 	|| eligiblePostCount <= 2
-	|| bestConfidencePercent >= 70
+	|| bestConfidencePercent >= 70)
-    )
       return 'thinking_near'
     if (
 	eligiblePostCount >= 15
-	&& bestConfidencePercent < 45
+	&& bestConfidencePercent < 45)
-    )
       return 'thinking_far'
     return 'thinking_mid'
   case 'guess':
@@ -3327,8 +3271,7 @@ const GekanatorBackdrop: FC<{
 
   const settingsForMode = useCallback (
       (
-	  mode: 'normal' | 'winning_run' | 'guess',
+	  mode: 'normal' | 'winning_run' | 'guess'): { columns: number; rows: number; opacity: number } => {
-      ): { columns: number; rows: number; opacity: number } => {
 	if (mode === 'winning_run' || mode === 'guess')
 	  return { columns: 8, rows: 8, opacity: motionMode === 'calm' ? .18 : .24 }
 
@@ -3342,8 +3285,7 @@ const GekanatorBackdrop: FC<{
   const scaleForMode = useCallback (
       (
 	  mode:                    'normal' | 'winning_run' | 'guess',
-	  displayedWinningCount:   number,
+	  displayedWinningCount:   number): number => {
-      ): number => {
 	if (mode === 'guess')
 	  return 8
 
@@ -3355,8 +3297,7 @@ const GekanatorBackdrop: FC<{
       [])
 
   const postsForMode = useCallback ((
-      mode: 'normal' | 'winning_run' | 'guess',
+      mode: 'normal' | 'winning_run' | 'guess'): Post[] => {
-  ): Post[] => {
     if (mode === 'guess' && displayedGuess)
       return [displayedGuess]
     if (mode === 'winning_run' && winningRunTargetPost)
@@ -3366,8 +3307,7 @@ const GekanatorBackdrop: FC<{
 
   const thumbnailsForMode = useCallback ((
       mode:      'normal' | 'winning_run' | 'guess',
-      count:     number,
+      count:     number): string[] => {
-  ): string[] => {
     const modePosts = postsForMode (mode)
     if (modePosts.length === 0)
       return []
@@ -3734,8 +3674,7 @@ const GekanatorBackdrop: FC<{
 
 const expectedAnswerFor = (
     question:     GekanatorQuestion | undefined,
-    correctPost:  Post | null,
+    correctPost:  Post | null): GekanatorAnswerValue | null =>
-): GekanatorAnswerValue | null =>
     expectedAnswerForQuestion (question, correctPost)
 
 
@@ -4169,8 +4108,7 @@ const GekanatorPage: FC<{ user: User | null }> = ({ user }) => {
 	setSaved (true)
 	setSavedGameId (data.id)
 	setLearnedExampleCount (data.learnedExampleCount)
-	setResultWon (variables.guessedPostId === variables.correctPostId)
+	setResultWon (variables.guessedPostId === variables.correctPostId)}})
-      }})
   const questionSuggestionMutation = useMutation ({
       mutationFn: saveGekanatorQuestionSuggestion,
       onSuccess: async data => {
@@ -4180,15 +4118,13 @@ const GekanatorPage: FC<{ user: User | null }> = ({ user }) => {
 	setQuestionSuggestionSearch ('')
 	setQuestionSuggestionSelectedId (null)
 	setQuestionSuggestion ('')
-	setQuestionSuggestionAnswer ('yes')
+	setQuestionSuggestionAnswer ('yes')}})
-      }})
   const extraQuestionAnswersMutation = useMutation ({
       mutationFn: saveGekanatorExtraQuestionAnswers,
       onSuccess: async () => {
 	await queryClient.refetchQueries ({ queryKey: gekanatorKeys.questions () })
 	setExtraQuestionState ('saved')
-	setPhase ('end')
+	setPhase ('end')}})
-      }})
 
   const resetExtraQuestionState = () => {
     const next = resettableExtraQuestionState ()
@@ -4330,8 +4266,7 @@ const GekanatorPage: FC<{ user: User | null }> = ({ user }) => {
       if (
 	  !(allowPreQuestionRecovery)
 	  || recoveredEligiblePosts.length === 0
-	  || recoveredEligiblePosts.length === 1
+	  || recoveredEligiblePosts.length === 1)
-      )
 	return false
 
       const nextQuestion = chooseQuestion ({
@@ -4493,8 +4428,7 @@ const GekanatorPage: FC<{ user: User | null }> = ({ user }) => {
     if (
 	!(nextPlan.question)
 	&& !(shouldEnterGuessPhase (nextPlan.guessReason))
-	&& recovered.eligiblePosts.length !== 1
+	&& recovered.eligiblePosts.length !== 1)
-    )
       {
 	const recoveredForQuestion = recoverQuestionState ({
 	    nextAnswers,
@@ -4602,8 +4536,7 @@ const GekanatorPage: FC<{ user: User | null }> = ({ user }) => {
 	!(canPersistGame)
 	|| reviewGuessedPostId == null
 	|| reviewCorrectPostId == null
-	|| saveMutation.isPending
+	|| saveMutation.isPending)
-    )
       return
 
     if (savedGameId != null)
@@ -4666,8 +4599,7 @@ const GekanatorPage: FC<{ user: User | null }> = ({ user }) => {
 	!(canPersistGame)
 	|| savedGameId == null
 	|| extraQuestionAnswersMutation.isPending
-	|| extraQuestions.some (question => !(extraQuestionAnswers[String (question.id)]))
+	|| extraQuestions.some (question => !(extraQuestionAnswers[String (question.id)])))
-    )
       return
 
     extraQuestionAnswersMutation.mutate ({
@@ -4870,8 +4802,7 @@ const GekanatorPage: FC<{ user: User | null }> = ({ user }) => {
 
   const answerExtraQuestion = (
       questionId:  number,
-      value:       GekanatorAnswerValue,
+      value:       GekanatorAnswerValue) => {
-  ) => {
     setExtraQuestionAnswers ({
 	...extraQuestionAnswers,
 	[String (questionId)]: value })
@@ -4909,8 +4840,7 @@ const GekanatorPage: FC<{ user: User | null }> = ({ user }) => {
 	|| isLoading
 	|| acceptedQuestionsLoading
 	|| shouldEnterGuessPhase (questionPlan.guessReason)
-	|| eligiblePosts.length === 1
+	|| eligiblePosts.length === 1)
-    )
       return
 
     const recovered = recoverQuestionState ({
@@ -4926,8 +4856,7 @@ const GekanatorPage: FC<{ user: User | null }> = ({ user }) => {
     if (
 	recovered.recoveryStepCount === recoveryStepCount
 	&& recovered.recoveredCandidatePosts.size === recoveredCandidatePosts.size
-	&& recovered.softenedQuestionIds.size === softenedQuestionIds.size
+	&& recovered.softenedQuestionIds.size === softenedQuestionIds.size)
-    )
       return
 
     setSoftenedQuestionIds (recovered.softenedQuestionIds)
@@ -4954,15 +4883,13 @@ const GekanatorPage: FC<{ user: User | null }> = ({ user }) => {
     if (
 	phase !== 'question'
 	|| isLoading
-	|| acceptedQuestionsLoading
+	|| acceptedQuestionsLoading)
-    )
       return
 
     if (
 	currentQuestion
 	|| !(questionPlan.guess)
-	|| !(shouldEnterGuessPhase (questionPlan.guessReason))
+	|| !(shouldEnterGuessPhase (questionPlan.guessReason)))
-    )
       return
 
     setWinningRunTargetId (questionPlan.winningRunTargetId)

frontend/src/pages/deerjikists/DeerjikistDetailPage.tsx

@@ -145,8 +145,7 @@ const DeerjikistDetailPage: FC = () => {
 				  return rtn
 				})}/>)}
 		      </FormField>
-		    </fieldset>
+		    </fieldset>))}
-		))}
 
 		<div className="py-3">
 		  <button
@@ -169,8 +168,7 @@ const DeerjikistDetailPage: FC = () => {
 		  </button>
 		</div>
 	      </form>
-	    </div>
+	    </div>)}
-	)}
       </MainArea>)
 }
 

frontend/src/pages/materials/MaterialDetailPage.tsx

@@ -45,14 +45,16 @@ const MaterialDetailPage: FC<{ user: User | null }> = ({ user }) => {
   const { data: material, isError, isLoading } = useQuery ({
       queryKey: materialsKeys.show (id ?? ''),
       queryFn:  () => fetchMaterial (id ?? ''),
-      enabled:  id != null,
+      enabled:  id != null})
-  })
+  const materialTitle = material
+      ? material.tag?.name ?? `素材 #${ material.id }`
+      : ''
 
   useEffect (() => {
     if (!(material))
       return
 
-    setTag (material.tag.name)
+    setTag (material.tag?.name ?? '')
     setURL (material.url ?? '')
     setExportPath (material.exportPaths.legacyDrive ?? '')
     if (material.file && material.contentType)
@@ -87,8 +89,7 @@ const MaterialDetailPage: FC<{ user: User | null }> = ({ user }) => {
       onError: error => {
 	applyValidationError (error)
 	toast ({ title: '更新失敗……', description: '入力を見直してください．' })
-      },
+      }})
-  })
 
   const suppressMutation = useMutation ({
       mutationFn: async (reason: string) =>
@@ -102,8 +103,7 @@ const MaterialDetailPage: FC<{ user: User | null }> = ({ user }) => {
       },
       onError: () => {
 	toast ({ title: '抑止に失敗しました' })
-      },
+      }})
-  })
 
   const handleSubmit = () => {
     clearValidationErrors ()
@@ -124,24 +124,25 @@ const MaterialDetailPage: FC<{ user: User | null }> = ({ user }) => {
       <MainArea>
 	{material && (
 	    <Helmet>
-              <title>{`${ material.tag.name } 素材照会 | ${ SITE_TITLE }`}</title>
+	      <title>{`${ materialTitle } 素材照会 | ${ SITE_TITLE }`}</title>
 	    </Helmet>)}
 
 	{isLoading ? 'Loading...' : isError ? (
 	    <p className="text-red-600 dark:text-red-300">
 	      素材の取得に失敗しました．
-            </p>
+	    </p>) : material == null ? (
-        ) : material == null ? (
 	    <p className="text-stone-700 dark:text-stone-300">
 	      素材が見つかりませんでした．
-            </p>
+	    </p>) : (
-        ) : (
 	    <>
 	      <PageTitle>
+		{material.tag
+		 ? (
 		    <TagLink
 			tag={material.tag}
 			withWiki={false}
-                    withCount={false}/>
+			withCount={false}/>)
+		 : materialTitle}
 	      </PageTitle>
 
 	      {material.fileSuppressedAt && (
@@ -155,7 +156,7 @@ const MaterialDetailPage: FC<{ user: User | null }> = ({ user }) => {
 
 	      {(!material.fileSuppressedAt && material.file && material.contentType) && (
 		  (/image\/.*/.test (material.contentType) && (
-                      <img src={material.file} alt={material.tag.name || undefined}/>))
+		      <img src={material.file} alt={material.tag?.name || undefined}/>))
 		  || (/video\/.*/.test (material.contentType) && (
 		      <video src={material.file} controls/>))
 		  || (/audio\/.*/.test (material.contentType) && (
@@ -163,9 +164,15 @@ const MaterialDetailPage: FC<{ user: User | null }> = ({ user }) => {
 
 	      <TabGroup>
 		<Tab name="Wiki">
+		  {material.tag
+		   ? (
 		      <WikiBody
 			  title={material.tag.name}
-                      body={material.wikiPageBody ?? undefined}/>
+			  body={material.wikiPageBody ?? undefined}/>)
+		   : (
+		      <p className="text-stone-700 dark:text-stone-300">
+			タグ未設定の素材です．
+		      </p>)}
 		</Tab>
 
 		<Tab name="編輯">

frontend/src/pages/materials/MaterialListPage.tsx

@@ -1,281 +1,280 @@
 import { useQuery } from '@tanstack/react-query'
-import { Fragment, useEffect, useMemo, useState } from 'react'
+import { useEffect, useMemo, useState } from 'react'
 import { Helmet } from 'react-helmet-async'
 import { useLocation, useNavigate } from 'react-router-dom'
 
 import nikumaru from '@/assets/fonts/nikumaru.otf'
 import PrefetchLink from '@/components/PrefetchLink'
-import TagLink from '@/components/TagLink'
+import DateTimeField from '@/components/common/DateTimeField'
 import FormField from '@/components/common/FormField'
 import PageTitle from '@/components/common/PageTitle'
-import SectionTitle from '@/components/common/SectionTitle'
+import Pagination from '@/components/common/Pagination'
-import SubsectionTitle from '@/components/common/SubsectionTitle'
-import TagInput from '@/components/common/TagInput'
 import MainArea from '@/components/layout/MainArea'
 import { API_BASE_URL, SITE_TITLE } from '@/config'
-import {
+import { fetchMaterials, parseMaterialFilter } from '@/lib/materials'
-    fetchMaterials,
-    fetchMaterialTagByName,
-    parseMaterialFilter,
-} from '@/lib/materials'
 import { materialsKeys } from '@/lib/queryKeys'
-import { inputClass } from '@/lib/utils'
+import { dateString, inputClass } from '@/lib/utils'
 
-import type { FC } from 'react'
+import type { FC, FormEvent } from 'react'
 
-import type { Material, MaterialFilter, MaterialTagTree } from '@/types'
+import type {
+    FetchMaterialsParams,
+    Material,
+    MaterialIndexDirection,
+    MaterialIndexMediaKind,
+    MaterialIndexSort,
+    MaterialIndexSuppression,
+    MaterialIndexTagState,
+    MaterialIndexView } from '@/types'
 
-const MATERIAL_FILTER_LABELS: Record<MaterialFilter, string> = {
+const MEDIA_KIND_LABELS: Record<Material['mediaKind'], string> = {
-    present: '素材あり',
+    image:      '画像',
-    missing: '素材なし',
+    video:      '動画',
-    any:     'すべて',
+    audio:      '音声',
+    file_other: 'その他ファイル',
+    url_only:   'URL のみ',
+    suppressed: '抑止済み'}
+
+const MEDIA_FILTER_LABELS: Record<MaterialIndexMediaKind, string> = {
+    all:        'すべて',
+    image:      '画像',
+    video:      '動画',
+    audio:      '音声',
+    file_other: 'その他ファイル',
+    url_only:   'URL のみ'}
+
+const SORT_LABELS: Record<MaterialIndexSort, string> = {
+    created_at:     '作成日時',
+    updated_at:     '更新日時',
+    tag_name:       'タグ名',
+    media_kind:     '種類',
+    file_byte_size: 'ファイルサイズ',
+    version_no:     'バージョン',
+    id:             'ID'}
+
+
+const setIf = (qs: URLSearchParams, key: string, value: string | null) => {
+  const next = value?.trim ()
+  if (next)
+    qs.set (key, next)
 }
 
 
-const MaterialCard = ({ tag }: { tag: MaterialTagTree }) => {
+const parseOption = <T extends string> (
-  if (!(tag.material))
+    value: string | null,
-    return null
+    allowed: readonly T[],
+    fallback: T): T => allowed.includes (value as T) ? value as T : fallback
 
-  return (
+
-      <PrefetchLink
+const fileSizeText = (bytes: number | null): string => {
-          to={`/materials/${ tag.material.id }`}
+  if (bytes == null)
-          className="block h-40 w-40">
+    return ''
+  if (bytes < 1024)
+    return `${ bytes } B`
+  if (bytes < 1024 * 1024)
+    return `${ (bytes / 1024).toFixed (1) } KB`
+  return `${ (bytes / 1024 / 1024).toFixed (1) } MB`
+}
+
+
+const materialTitle = (material: Material): string =>
+    material.tag?.name ?? `素材 #${ material.id }`
+
+
+const MaterialThumb: FC<{ material: Material }> = ({ material }) => (
     <div
-            className={`h-full w-full overflow-hidden rounded-xl shadow text-center
+	className={`flex aspect-square h-[180px] w-[180px] items-center justify-center
-                        content-center text-4xl ${
+		    overflow-hidden rounded-lg border text-center shadow-sm ${
-                        tag.material.fileSuppressedAt
-                        ? 'border-2 border-red-300 bg-red-50 text-base text-red-900 ' +
-                          'dark:border-red-800 dark:bg-red-950 dark:text-red-100'
-                        : 'bg-white text-stone-900 dark:bg-stone-900 dark:text-stone-100' }`}
-            style={{ fontFamily: 'Nikumaru' }}>
-          {tag.material.fileSuppressedAt
-           ? <span>抑止済み</span>
-           : (tag.material.contentType && /image\/.*/.test (tag.material.contentType))
-           ? <img src={tag.material.file || undefined}/>
-           : <span>照会</span>}
-        </div>
-      </PrefetchLink>)
-}
-
-
-const MaterialList = ({ materials }: { materials: Material[] }) => (
-    <div className="grid gap-3 sm:grid-cols-2 xl:grid-cols-3">
-      {materials.map (material => (
-          <article
-              key={material.id}
-              className={`rounded-2xl border p-4 shadow-sm ${
 		    material.fileSuppressedAt
-                  ? 'border-red-200 bg-red-50 text-red-900 dark:border-red-900 ' +
+		    ? [
-                    'dark:bg-red-950 dark:text-red-100'
+			'border-red-300 bg-red-50 text-red-900 dark:border-red-800',
-                  : 'border-stone-200 bg-white text-stone-900 dark:border-stone-700 ' +
+			'dark:bg-red-950 dark:text-red-100'].join (' ')
-                    'dark:bg-stone-900 dark:text-stone-100'}`}>
+		    : [
-            <div className="flex items-start justify-between gap-3">
+			'border-stone-200 bg-white text-stone-900 dark:border-stone-700',
+			'dark:bg-stone-900 dark:text-stone-100'].join (' ') }`}>
+      {material.thumbnail
+       ? <img src={material.thumbnail} alt="" className="h-full w-full object-contain"/>
+       : (
+	  <span
+	      className="px-2 text-2xl leading-tight"
+	      style={{ fontFamily: material.thumbnailFallbackKind === 'tag_name'
+		  ? 'Nikumaru'
+		  : undefined }}>
+	    {material.thumbnailFallbackText}
+	  </span>)}
+    </div>)
+
+
+const MaterialCard: FC<{ material: Material }> = ({ material }) => (
+    <article className="w-[180px] justify-self-center">
+      <PrefetchLink to={`/materials/${ material.id }`} className="block">
+	<MaterialThumb material={material}/>
+	<div className="mt-2 w-[180px]">
+	  <p className="truncate text-sm font-medium text-stone-900 dark:text-stone-100">
+	    {materialTitle (material)}
+	  </p>
+	  <p className="truncate text-xs text-stone-600 dark:text-stone-300">
+	    {MEDIA_KIND_LABELS[material.mediaKind]} / {dateString (material.createdAt)}
+	  </p>
+	</div>
+      </PrefetchLink>
+    </article>)
+
+
+const MaterialListItem: FC<{ material: Material }> = ({ material }) => (
+    <article
+	className={`rounded-lg border p-3 shadow-sm ${
+		    material.fileSuppressedAt
+		    ? [
+			'border-red-200 bg-red-50 text-red-900 dark:border-red-900',
+			'dark:bg-red-950 dark:text-red-100'].join (' ')
+		    : [
+			'border-stone-200 bg-white text-stone-900 dark:border-stone-700',
+			'dark:bg-stone-900 dark:text-stone-100'].join (' ')}`}>
+      <div className="flex gap-3">
+	<MaterialThumb material={material}/>
+	<div className="min-w-0 flex-1 space-y-2">
 	  <div>
-                <h2 className="font-medium text-stone-900 dark:text-stone-100">
+	    <PrefetchLink
-                  {material.tag?.name ?? '未分類素材'}
+		to={`/materials/${ material.id }`}
-                </h2>
+		className="font-medium text-sky-700 underline underline-offset-2
+			   dark:text-sky-300">
+	      {materialTitle (material)}
+	    </PrefetchLink>
 	    {material.fileSuppressedAt && (
 		<p className="mt-1 text-sm text-red-700 dark:text-red-200">抑止済み</p>)}
 	  </div>
-              <PrefetchLink
+	  <dl className="space-y-1 text-sm text-stone-600 dark:text-stone-300">
-                  to={`/materials/${ material.id }`}
+	    <div>
-                  className="text-sm text-sky-700 underline underline-offset-2 dark:text-sky-300">
+	      <dt className="inline">種類: </dt>
-                照会
+	      <dd className="inline">{MEDIA_KIND_LABELS[material.mediaKind]}</dd>
-              </PrefetchLink>
 	    </div>
-            {material.exportPaths.legacyDrive && (
+	    {material.fileByteSize != null && (
-                <p className="mt-3 break-all text-sm text-stone-600 dark:text-stone-300">
+		<div>
-                  {material.exportPaths.legacyDrive}
+		  <dt className="inline">サイズ: </dt>
-                </p>)}
+		  <dd className="inline">{fileSizeText (material.fileByteSize)}</dd>
-          </article>))}
-    </div>)
-
-
-const MaterialTagTreeView = ({ tag }: { tag: MaterialTagTree }) => (
-    <>
-      <PageTitle>
-        <TagLink
-            tag={tag}
-            withWiki={false}
-            withCount={false}
-            to={tag.material
-                ? `/materials/${ tag.material.id }`
-                : `/materials?tag=${ encodeURIComponent (tag.name) }`}/>
-      </PageTitle>
-      {(!tag.material && tag.hasMaterial !== true && tag.category !== 'meme') && (
-          <div className="-mt-2">
-            <PrefetchLink to={`/materials/new?tag=${ encodeURIComponent (tag.name) }`}>
-              追加
-            </PrefetchLink>
 		</div>)}
-
+	    {material.url && (
-      <MaterialCard tag={tag}/>
+		<div>
-
+		  <dt className="inline">URL: </dt>
-      <div className="ml-2 overflow-x-auto pb-2">
+		  <dd className="inline break-all">{material.url}</dd>
-        {tag.children.map (c2 => (
-            <Fragment key={c2.id}>
-              <SectionTitle>
-                <TagLink
-                    tag={c2}
-                    withWiki={false}
-                    withCount={false}
-                    to={`/materials?tag=${ encodeURIComponent (c2.name) }`}/>
-              </SectionTitle>
-              {(!c2.material && c2.hasMaterial !== true && c2.category !== 'meme') && (
-                  <div className="-mt-4">
-                    <PrefetchLink to={`/materials/new?tag=${ encodeURIComponent (c2.name) }`}>
-                      追加
-                    </PrefetchLink>
 		</div>)}
-
+	    <div>
-              <MaterialCard tag={c2}/>
+	      <dt className="inline">作成: </dt>
-
+	      <dd className="inline">{dateString (material.createdAt)}</dd>
-              <div className="ml-2">
-                {c2.children.map (c3 => (
-                    <Fragment key={c3.id}>
-                      <SubsectionTitle>
-                        <TagLink
-                            tag={c3}
-                            withWiki={false}
-                            withCount={false}
-                            to={`/materials?tag=${ encodeURIComponent (c3.name) }`}/>
-                      </SubsectionTitle>
-                      {(!c3.material && c3.hasMaterial !== true && c3.category !== 'meme') && (
-                          <div className="-mt-2">
-                            <PrefetchLink
-                                to={`/materials/new?tag=${ encodeURIComponent (c3.name) }`}>
-                              追加
-                            </PrefetchLink>
-                          </div>)}
-
-                      <MaterialCard tag={c3}/>
-                    </Fragment>))}
 	    </div>
-            </Fragment>))}
+	  </dl>
-      </div>
-    </>)
-
-
-const MaterialSearchTop: FC<{
-    materialFilter: MaterialFilter
-    setMaterialFilter: (value: MaterialFilter) => void
-    tagName: string
-    setTagName: (value: string) => void
-}> = ({ materialFilter, setMaterialFilter, tagName, setTagName }) => {
-  const navigate = useNavigate ()
-  const location = useLocation ()
-
-  const handleSearch = () => {
-    const qs = new URLSearchParams (location.search)
-    if (tagName.trim ())
-      qs.set ('tag', tagName.trim ())
-    else
-      qs.delete ('tag')
-    qs.delete ('unclassified')
-    qs.set ('material_filter', materialFilter)
-    navigate (`/materials?${ qs.toString () }`)
-  }
-
-  return (
-      <div className="mx-auto max-w-3xl space-y-6">
-        <PageTitle>素材集</PageTitle>
-
-        <section className="rounded-3xl border border-stone-200 bg-white p-5 shadow-sm
-                            text-stone-900 dark:border-stone-700 dark:bg-stone-900
-                            dark:text-stone-100">
-          <div className="space-y-4">
-            <FormField label="タグ名検索">
-              {() => (
-                  <TagInput
-                      value={tagName}
-                      setValue={setTagName}/>)}
-            </FormField>
-
-            <FormField label="素材状態">
-              {({ invalid }) => (
-                  <select
-                      value={materialFilter}
-                      onChange={e => setMaterialFilter (e.target.value as MaterialFilter)}
-                      className={inputClass (invalid)}>
-                    {Object.entries (MATERIAL_FILTER_LABELS).map (([value, label]) => (
-                        <option key={value} value={value}>
-                          {label}
-                        </option>))}
-                  </select>)}
-            </FormField>
-
-            <div className="flex flex-wrap gap-3">
-              <button
-                  type="button"
-                  onClick={handleSearch}
-                  className="rounded-full bg-sky-600 px-4 py-2 text-white hover:bg-sky-700
-                             dark:bg-sky-500 dark:text-stone-950 dark:hover:bg-sky-400">
-                この条件で探す
-              </button>
-              <PrefetchLink
-                  to={`/materials?unclassified=1&material_filter=${ materialFilter }`}
-                  className="rounded-full border border-stone-300 bg-white px-4 py-2
-                             text-stone-900 hover:bg-stone-100 dark:border-stone-700
-                             dark:bg-stone-900 dark:text-stone-100 dark:hover:bg-stone-800">
-                未分類素材を見る
-              </PrefetchLink>
-              <PrefetchLink
-                  to="/materials/new"
-                  className="rounded-full border border-stone-300 bg-white px-4 py-2
-                             text-stone-900 hover:bg-stone-100 dark:border-stone-700
-                             dark:bg-stone-900 dark:text-stone-100 dark:hover:bg-stone-800">
-                新規素材を追加
-              </PrefetchLink>
-              <a
-                  href={`${ API_BASE_URL }/materials/download.zip?profile=legacy_drive`}
-                  target="_blank"
-                  rel="noopener noreferrer"
-                  className="rounded-full border border-stone-300 bg-white px-4 py-2
-                             text-stone-900 hover:bg-stone-100 dark:border-stone-700
-                             dark:bg-stone-900 dark:text-stone-100 dark:hover:bg-stone-800">
-                ZIP をダウンロード
-              </a>
 	</div>
       </div>
-        </section>
+    </article>)
-      </div>)
-}
 
 
 const MaterialListPage: FC = () => {
   const location = useLocation ()
+  const navigate = useNavigate ()
   const query = useMemo (() => new URLSearchParams (location.search), [location.search])
-  const tagQuery = query.get ('tag') ?? ''
+  const materialFilter = parseMaterialFilter (query.get ('material_filter'), 'present')
-  const unclassified = query.get ('unclassified') === '1'
-  const initialFilter = parseMaterialFilter (query.get ('material_filter'), 'present')
 
-  const [tagName, setTagName] = useState (tagQuery)
+  const page = Number (query.get ('page') ?? 1)
-  const [materialFilter, setMaterialFilter] = useState<MaterialFilter> (initialFilter)
+  const limit = Number (query.get ('limit') ?? 20)
+  const qQuery = query.get ('q') ?? query.get ('tag') ?? ''
+  const tagState = query.get ('unclassified') === '1'
+      ? 'untagged'
+      : parseOption<MaterialIndexTagState> (
+	  query.get ('tag_state'),
+	  ['all', 'tagged', 'untagged'],
+	  'all')
+  const mediaKind = parseOption<MaterialIndexMediaKind> (
+      query.get ('media_kind'),
+      ['all', 'image', 'video', 'audio', 'file_other', 'url_only'],
+      'all')
+  const suppression = parseOption<MaterialIndexSuppression> (
+      query.get ('suppression'),
+      ['active', 'suppressed', 'all'],
+      'active')
+  const sort = parseOption<MaterialIndexSort> (
+      query.get ('sort'),
+      ['created_at', 'updated_at', 'tag_name', 'media_kind', 'file_byte_size',
+       'version_no', 'id'],
+      'created_at')
+  const direction = parseOption<MaterialIndexDirection> (
+      query.get ('direction'),
+      ['asc', 'desc'],
+      'desc')
+  const view = parseOption<MaterialIndexView> (query.get ('view'), ['card', 'list'], 'card')
+  const createdFromQuery = query.get ('created_from') ?? ''
+  const createdToQuery = query.get ('created_to') ?? ''
+  const updatedFromQuery = query.get ('updated_from') ?? ''
+  const updatedToQuery = query.get ('updated_to') ?? ''
 
-  const {
+  const [q, setQ] = useState ('')
-      data: tag,
+  const [tagStateInput, setTagStateInput] = useState<MaterialIndexTagState> ('all')
-      isLoading: tagLoading,
+  const [mediaKindInput, setMediaKindInput] = useState<MaterialIndexMediaKind> ('all')
-      isError: tagError,
+  const [suppressionInput, setSuppressionInput] =
-  } = useQuery ({
+      useState<MaterialIndexSuppression> ('active')
-      queryKey: materialsKeys.byTagName (tagQuery, initialFilter),
+  const [createdFrom, setCreatedFrom] = useState<string | null> (null)
-      queryFn:  () => fetchMaterialTagByName (tagQuery, initialFilter),
+  const [createdTo, setCreatedTo] = useState<string | null> (null)
-      enabled:  tagQuery !== '' && !unclassified,
+  const [updatedFrom, setUpdatedFrom] = useState<string | null> (null)
-  })
+  const [updatedTo, setUpdatedTo] = useState<string | null> (null)
 
-  const {
+  const keys: FetchMaterialsParams = {
-      data: unclassifiedData,
+      q: qQuery,
-      isLoading: unclassifiedLoading,
+      tagState,
-      isError: unclassifiedError,
+      mediaKind,
-  } = useQuery ({
+      suppression,
-      queryKey: materialsKeys.unclassified ({ page: 1, limit: 50 }),
+      createdFrom: createdFromQuery,
-      queryFn:  () => fetchMaterials ({ page: 1, limit: 50, unclassified: true }),
+      createdTo: createdToQuery,
-      enabled:  unclassified,
+      updatedFrom: updatedFromQuery,
-  })
+      updatedTo: updatedToQuery,
+      sort,
+      direction,
+      view,
+      page,
+      limit}
+  const { data, isLoading, isError } = useQuery ({
+      queryKey: materialsKeys.index (keys),
+      queryFn:  () => fetchMaterials (keys)})
+  const materials = data?.materials ?? []
+  const totalPages = data ? Math.ceil (data.count / limit) : 0
 
   useEffect (() => {
-    setTagName (tagQuery)
+    setQ (qQuery)
-    setMaterialFilter (initialFilter)
+    setTagStateInput (tagState)
-  }, [initialFilter, tagQuery])
+    setMediaKindInput (mediaKind)
+    setSuppressionInput (suppression)
+    setCreatedFrom (createdFromQuery)
+    setCreatedTo (createdToQuery)
+    setUpdatedFrom (updatedFromQuery)
+    setUpdatedTo (updatedToQuery)
+  }, [createdFromQuery, createdToQuery, mediaKind, qQuery, suppression, tagState,
+      updatedFromQuery, updatedToQuery])
+
+  const search = (e: FormEvent) => {
+    e.preventDefault ()
+
+    const qs = new URLSearchParams ()
+    setIf (qs, 'q', q)
+    qs.set ('tag_state', tagStateInput)
+    qs.set ('media_kind', mediaKindInput)
+    qs.set ('suppression', suppressionInput)
+    setIf (qs, 'created_from', createdFrom)
+    setIf (qs, 'created_to', createdTo)
+    setIf (qs, 'updated_from', updatedFrom)
+    setIf (qs, 'updated_to', updatedTo)
+    qs.set ('sort', sort)
+    qs.set ('direction', direction)
+    qs.set ('view', view)
+    qs.set ('page', '1')
+    qs.set ('limit', String (limit))
+    qs.set ('material_filter', materialFilter)
+    navigate (`/materials?${ qs.toString () }`)
+  }
+
+  const updateQuery = (changes: Record<string, string>) => {
+    const qs = new URLSearchParams (location.search)
+    Object.entries (changes).forEach (([key, value]) => qs.set (key, value))
+    navigate (`/materials?${ qs.toString () }`)
+  }
 
   return (
       <MainArea>
@@ -288,41 +287,194 @@ const MaterialListPage: FC = () => {
 		  src: url(${ nikumaru }) format('opentype');
 		}`}
 	  </style>
-          <title>{`${ tag ? `${ tag.name } 素材集` : '素材集' } | ${ SITE_TITLE }`}</title>
+	  <title>{`素材一覧 | ${ SITE_TITLE }`}</title>
 	</Helmet>
 
-        {unclassified ? (
+	<div className="space-y-5">
-            <>
+	  <div className="flex flex-wrap items-center justify-between gap-3">
-              <PageTitle>未分類素材</PageTitle>
+	    <PageTitle>素材一覧</PageTitle>
-              <div className="-mt-2 mb-4">
+	    <div className="flex flex-wrap gap-2">
+	      <PrefetchLink
+		  to="/materials/new"
+		  className="rounded-full border border-stone-300 bg-white px-4 py-2 text-sm
+			     text-stone-900 hover:bg-stone-100 dark:border-stone-700
+			     dark:bg-stone-900 dark:text-stone-100 dark:hover:bg-stone-800">
+		新規素材を追加
+	      </PrefetchLink>
+	      <a
+		  href={`${ API_BASE_URL }/materials/download.zip?profile=legacy_drive`}
+		  target="_blank"
+		  rel="noopener noreferrer"
+		  className="rounded-full border border-stone-300 bg-white px-4 py-2 text-sm
+			     text-stone-900 hover:bg-stone-100 dark:border-stone-700
+			     dark:bg-stone-900 dark:text-stone-100 dark:hover:bg-stone-800">
+		ZIP をダウンロード
+	      </a>
+	    </div>
+	  </div>
+
+	  {tagState === 'untagged' && (
 	      <PrefetchLink
 		  to={`/materials?material_filter=${ materialFilter }`}
-                    className="text-sm text-sky-700 underline underline-offset-2
+		  className="text-sm text-sky-700 underline underline-offset-2 dark:text-sky-300">
-                               dark:text-sky-300">
 		素材検索トップへ戻る
-                </PrefetchLink>
+	      </PrefetchLink>)}
+
+	  <form
+	      onSubmit={search}
+	      className="max-w-3xl rounded-lg border border-stone-200 bg-white p-4
+			 text-stone-900 dark:border-stone-700 dark:bg-stone-900
+			 dark:text-stone-100">
+	    <div className="space-y-3">
+	      <FormField label="検索">
+		{({ invalid }) => (
+		    <input
+			type="search"
+			value={q}
+			onChange={e => setQ (e.target.value)}
+			placeholder="タグ名 / URL / ファイル名"
+			className={inputClass (invalid)}/>)}
+	      </FormField>
+
+	      <FormField label="タグ状態">
+		{({ invalid }) => (
+		    <select
+			value={tagStateInput}
+			onChange={e => setTagStateInput (
+			    e.target.value as MaterialIndexTagState)}
+			className={inputClass (invalid)}>
+		      <option value="all">すべて</option>
+		      <option value="tagged">タグあり</option>
+		      <option value="untagged">タグなし</option>
+		    </select>)}
+	      </FormField>
+
+	      <FormField label="メディア">
+		{({ invalid }) => (
+		    <select
+			value={mediaKindInput}
+			onChange={e => setMediaKindInput (
+			    e.target.value as MaterialIndexMediaKind)}
+			className={inputClass (invalid)}>
+		      {Object.entries (MEDIA_FILTER_LABELS).map (([value, label]) => (
+			  <option key={value} value={value}>
+			    {label}
+			  </option>))}
+		    </select>)}
+	      </FormField>
+
+	      <FormField label="抑止状態">
+		{({ invalid }) => (
+		    <select
+			value={suppressionInput}
+			onChange={e => setSuppressionInput (
+			    e.target.value as MaterialIndexSuppression)}
+			className={inputClass (invalid)}>
+		      <option value="active">有効のみ</option>
+		      <option value="suppressed">抑止済みのみ</option>
+		      <option value="all">すべて</option>
+		    </select>)}
+	      </FormField>
+
+	      <FormField label="作成日時">
+		{() => (
+		    <div className="flex flex-wrap items-center gap-2">
+		      <DateTimeField value={createdFrom ?? undefined} onChange={setCreatedFrom}/>
+		      <span>〜</span>
+		      <DateTimeField value={createdTo ?? undefined} onChange={setCreatedTo}/>
+		    </div>)}
+	      </FormField>
+
+	      <FormField label="更新日時">
+		{() => (
+		    <div className="flex flex-wrap items-center gap-2">
+		      <DateTimeField value={updatedFrom ?? undefined} onChange={setUpdatedFrom}/>
+		      <span>〜</span>
+		      <DateTimeField value={updatedTo ?? undefined} onChange={setUpdatedTo}/>
+		    </div>)}
+	      </FormField>
+	    </div>
+
+	    <div className="mt-4 flex flex-wrap gap-3">
+	      <button
+		  type="submit"
+		  className="rounded bg-sky-600 px-4 py-2 text-white hover:bg-sky-700
+			     dark:bg-sky-500 dark:text-stone-950 dark:hover:bg-sky-400">
+		検索
+	      </button>
+	    </div>
+	  </form>
+
+	  <div className="flex flex-wrap items-center justify-between gap-3">
+	    <div className="flex flex-wrap gap-2">
+	      <button
+		  type="button"
+		  onClick={() => updateQuery ({ view: 'card' })}
+		  className={`rounded-full border px-4 py-2 text-sm ${
+		      view === 'card'
+		      ? [
+			  'border-sky-500 bg-sky-50 text-sky-700 dark:border-sky-400',
+			  'dark:bg-sky-950 dark:text-sky-100'].join (' ')
+		      : [
+			  'border-stone-300 bg-white text-stone-900 dark:border-stone-700',
+			  'dark:bg-stone-900 dark:text-stone-100'].join (' ') }`}>
+		カード
+	      </button>
+	      <button
+		  type="button"
+		  onClick={() => updateQuery ({ view: 'list' })}
+		  className={`rounded-full border px-4 py-2 text-sm ${
+		      view === 'list'
+		      ? [
+			  'border-sky-500 bg-sky-50 text-sky-700 dark:border-sky-400',
+			  'dark:bg-sky-950 dark:text-sky-100'].join (' ')
+		      : [
+			  'border-stone-300 bg-white text-stone-900 dark:border-stone-700',
+			  'dark:bg-stone-900 dark:text-stone-100'].join (' ') }`}>
+		一覧
+	      </button>
+	    </div>
+
+	    <div className="flex flex-wrap items-center gap-2 text-sm">
+	      <select
+		  value={sort}
+		  onChange={e => updateQuery ({ sort: e.target.value, page: '1' })}
+		  className={inputClass (false, 'w-auto')}>
+		{Object.entries (SORT_LABELS).map (([value, label]) => (
+		    <option key={value} value={value}>
+		      {label}
+		    </option>))}
+	      </select>
+	      <select
+		  value={direction}
+		  onChange={e => updateQuery ({ direction: e.target.value, page: '1' })}
+		  className={inputClass (false, 'w-auto')}>
+		<option value="desc">降順</option>
+		<option value="asc">昇順</option>
+	      </select>
+	    </div>
+	  </div>
+
+	  {isLoading && <p>Loading...</p>}
+	  {isError && (
+	      <p className="text-red-600 dark:text-red-300">素材一覧の取得に失敗しました．</p>)}
+	  {(!isLoading && !isError && materials.length === 0) && (
+	      <p>素材はありません．</p>)}
+	  {materials.length > 0 && (
+	      view === 'card'
+	      ? (
+		  <div className="grid grid-cols-[repeat(auto-fill,minmax(196px,1fr))]
+				  justify-items-center gap-4">
+		    {materials.map (material => (
+			<MaterialCard key={material.id} material={material}/>))}
+		  </div>)
+	      : (
+		  <div className="space-y-3">
+		    {materials.map (material => (
+			<MaterialListItem key={material.id} material={material}/>))}
+		  </div>))}
+	  <Pagination page={page} totalPages={totalPages}/>
 	</div>
-              {unclassifiedLoading && <p>Loading...</p>}
-              {unclassifiedError && (
-                  <p className="text-red-600 dark:text-red-300">未分類素材の取得に失敗しました．</p>)}
-              {unclassifiedData && unclassifiedData.materials.length === 0 && (
-                  <p>未分類素材はありません．</p>)}
-              {unclassifiedData && unclassifiedData.materials.length > 0 && (
-                  <MaterialList materials={unclassifiedData.materials}/>)}
-            </>) : tagQuery ? (
-                <>
-                  {tagLoading && <p>Loading...</p>}
-                  {tagError && (
-                      <p className="text-red-600">素材一覧の取得に失敗しました．</p>)}
-                  {(!tagLoading && !tagError && !tag) && (
-                      <p>該当する素材タグが見つかりませんでした．</p>)}
-                  {tag && <MaterialTagTreeView tag={tag}/>}
-                </>) : (
-                    <MaterialSearchTop
-                        tagName={tagName}
-                        setTagName={setTagName}
-                        materialFilter={materialFilter}
-                        setMaterialFilter={setMaterialFilter}/>)}
       </MainArea>)
 }
 

frontend/src/pages/materials/MaterialNewPage.tsx

@@ -59,8 +59,7 @@ const MaterialNewPage: FC = () => {
       onError: error => {
 	applyValidationError (error)
 	toast ({ title: '送信失敗……', description: '入力を見直してください．' })
-      },
+      }})
-  })
 
   const handleSubmit = () => {
     clearValidationErrors ()

frontend/src/pages/posts/PostDetailPage.tsx

@@ -62,8 +62,7 @@ const PostDetailPage: FC<Props> = ({ user }) => {
 	toast ({ title: '失敗……', description: '通信に失敗しました……' })
       },
       onSuccess: () => {
-	qc.invalidateQueries ({ queryKey: postsKeys.root })
+	qc.invalidateQueries ({ queryKey: postsKeys.root })} })
-      } })
 
   useEffect (() => {
     if (!(errorFlg))
@@ -114,8 +113,7 @@ const PostDetailPage: FC<Props> = ({ user }) => {
 		      <PostList posts={[{ ...post, childPosts: [{ } as Post] },
 					...post.childPosts!.map (p => ({
 					    ...p, parentPosts: [{ } as Post] }))]}/>
-		    </div>
+		    </div>)}
-		)}
 		{(post.parentPosts ?? []).map (pp => {
 		  const siblings = post.siblingPosts?.[String (pp.id) as `${ number }`]
 		  if (!(siblings))

frontend/src/pages/tags/NicoTagListPage.tsx

@@ -1,6 +1,6 @@
 import { useQuery, useQueryClient } from '@tanstack/react-query'
 import { Check, LoaderCircle, Pencil, X } from 'lucide-react'
-import { useEffect, useMemo, useState } from 'react'
+import { Fragment, useEffect, useMemo, useState } from 'react'
 import { Helmet } from 'react-helmet-async'
 import { useLocation, useNavigate } from 'react-router-dom'
 
@@ -87,8 +87,7 @@ const NicoTagListPage: FC<Props> = ({ user }) => {
   const defaultDirection = {
       name:       'asc',
       created_at: 'desc',
-      updated_at: 'desc',
+      updated_at: 'desc'} as const
-  } as const
 
   const beginEdit = async (tag: NicoTag) => {
     const editingTag = nicoTags.find (tag => tag.id === editingId)
@@ -99,15 +98,13 @@ const NicoTagListPage: FC<Props> = ({ user }) => {
 	&& !(await dialogue.confirm ({
 	  title:       '編集中の内容を破棄しますか?',
 	  confirmText: '破棄',
-	  variant:     'danger',
+	  variant:     'danger'})))
-	})))
       return
 
     setEditingId (tag.id)
     setRawTags (rawTags => ({
 	...rawTags,
-	[tag.id]: tag.linkedTags.map (linkedTag => linkedTag.name).join (' '),
+	[tag.id]: tag.linkedTags.map (linkedTag => linkedTag.name).join (' ')}))
-    }))
     setErrorsByTagId (errors => ({ ...errors, [tag.id]: [] }))
   }
 
@@ -115,8 +112,7 @@ const NicoTagListPage: FC<Props> = ({ user }) => {
     setEditingId (null)
     setRawTags (rawTags => ({
 	...rawTags,
-	[tag.id]: tag.linkedTags.map (linkedTag => linkedTag.name).join (' '),
+	[tag.id]: tag.linkedTags.map (linkedTag => linkedTag.name).join (' ')}))
-    }))
     setErrorsByTagId (errors => ({ ...errors, [tag.id]: [] }))
   }
 
@@ -141,8 +137,7 @@ const NicoTagListPage: FC<Props> = ({ user }) => {
 	  ...errors,
 	  [id]: validationError?.fieldErrors.tags
 	      ?? validationError?.baseErrors
-	      ?? ['更新できませんでした．'],
+	      ?? ['更新できませんでした．']}))
-      }))
       toast ({ title: '更新失敗', description: '入力内容を確認してください．' })
     }
     finally
@@ -166,8 +161,7 @@ const NicoTagListPage: FC<Props> = ({ user }) => {
 
     setRawTags (Object.fromEntries (data.tags.map (tag => [
       tag.id,
-      tag.linkedTags.map (linkedTag => linkedTag.name).join (' '),
+      tag.linkedTags.map (linkedTag => linkedTag.name).join (' ')])))
-    ])))
   }, [data])
 
   useEffect (() => {
@@ -282,7 +276,8 @@ const NicoTagListPage: FC<Props> = ({ user }) => {
 			{nicoTags.map (tag => {
 			  const isEditing = editingId === tag.id
 
-			  return [
+			  return (
+			      <Fragment key={tag.id}>
 			    <tr
 				key={tag.id}
 				className={cn (
@@ -321,8 +316,8 @@ const NicoTagListPage: FC<Props> = ({ user }) => {
 					  編集
 					</button>)}
 				  </td>)}
-			    </tr>,
+			    </tr>
-			    isEditing && (
+			    {isEditing && (
 				<tr key={`${ tag.id }-edit`}
 				    className="border-b border-rose-200 bg-rose-50 dark:border-rose-900
 					       dark:bg-rose-950/30">
@@ -340,8 +335,7 @@ const NicoTagListPage: FC<Props> = ({ user }) => {
 					  placeholder="タグ名を空白または改行で区切って入力"
 					  onChange={e => setRawTags (rawTags => ({
 					      ...rawTags,
-					      [tag.id]: e.target.value,
+					      [tag.id]: e.target.value}))}/>
-					  }))}/>
 				      <FieldError messages={errorsByTagId[tag.id]}/>
 				      <div className="flex justify-end gap-2">
 					<button
@@ -368,8 +362,8 @@ const NicoTagListPage: FC<Props> = ({ user }) => {
 				      </div>
 				    </div>
 				  </td>
-				</tr>),
+				</tr>)}
-			  ]
+			      </Fragment>)
 			})}
 		      </tbody>
 		    </table>

frontend/src/pages/theatres/TheatreDetailPage.tsx

@@ -69,8 +69,7 @@ const userName = (user: Pick<User, 'id' | 'name'> | null | undefined): string =>
 
 const commentBox = (
     comment: TheatreComment,
-    programme: TheatreProgramme | null = null,
+    programme: TheatreProgramme | null = null): ReactNode[] =>
-): ReactNode[] =>
     [(
 	<div key={`${ comment.no }-content`} className="w-full">
 	  {comment.deleted
@@ -120,8 +119,7 @@ const tagsByCategory = (tags: Tag[]): Partial<Record<Category, Tag[]>> => {
 
 
 const TagList: FC<{ tags: Tag[]; compact?: boolean; flow?: TagFlow }> = (
-    { tags, compact, flow = 'vertical' },
+    { tags, compact, flow = 'vertical' }) => {
-) => {
   const grouped = tagsByCategory (tags)
 
   if (flow === 'horizontal')

frontend/src/stores/sharedTransitionStore.ts

@@ -15,5 +15,4 @@ export const useSharedTransitionStore = create<SharedTransitionState> (set => ({
 	set (state => {
 	  const next = { ...state.byLocationKey }
 	  delete next[locationKey]
-	  return { byLocationKey: next }
+	  return { byLocationKey: next }}) }))
-	}) }))

frontend/src/test/factories.ts

@@ -77,7 +77,12 @@ export const buildMaterial = (overrides: Partial<Material> = {}): Material => ({
   file:                  null,
   url:                   null,
   wikiPageBody:          null,
+  thumbnail:             null,
+  thumbnailFallbackText: 'テストタグ',
+  thumbnailFallbackKind: 'tag_name',
+  mediaKind:             'url_only',
   contentType:           null,
+  fileByteSize:          null,
   fileSuppressedAt:      null,
   fileSuppressionReason: null,
   exportPaths:           {},

frontend/src/types.ts

@@ -67,14 +67,59 @@ export type FetchNicoTagsOrderField = 'name' | 'created_at' | 'updated_at'
 
 export type MaterialFilter = 'present' | 'missing' | 'any'
 
+export type MaterialIndexDirection = 'asc' | 'desc'
+
+export type MaterialIndexMediaKind =
+    | 'all'
+    | 'image'
+    | 'video'
+    | 'audio'
+    | 'file_other'
+    | 'url_only'
+
+export type MaterialIndexSort =
+    | 'created_at'
+    | 'updated_at'
+    | 'tag_name'
+    | 'media_kind'
+    | 'file_byte_size'
+    | 'version_no'
+    | 'id'
+
+export type MaterialIndexSuppression = 'active' | 'suppressed' | 'all'
+
+export type MaterialIndexTagState = 'all' | 'tagged' | 'untagged'
+
+export type MaterialIndexView = 'card' | 'list'
+
+export type FetchMaterialsParams = {
+    q:            string
+    tagState:     MaterialIndexTagState
+    mediaKind:    MaterialIndexMediaKind
+    suppression:  MaterialIndexSuppression
+    createdFrom:  string
+    createdTo:    string
+    updatedFrom:  string
+    updatedTo:    string
+    sort:         MaterialIndexSort
+    direction:    MaterialIndexDirection
+    view:         MaterialIndexView
+    page:         number
+    limit:        number }
+
 export type Material = {
     id:                     number
     versionNo:              number
-    tag:                    Tag
+    tag:                    Tag | null
     file:                   string | null
     url:                    string | null
     wikiPageBody?:          string | null
+    thumbnail:              string | null
+    thumbnailFallbackText:  string | null
+    thumbnailFallbackKind:  'tag_name' | 'created_at'
+    mediaKind:              'image' | 'video' | 'audio' | 'file_other' | 'url_only' | 'suppressed'
     contentType:            string | null
+    fileByteSize:           number | null
     fileSuppressedAt:       string | null
     fileSuppressionReason:  string | null
     exportPaths:            Record<string, string>