#434

frontend/src/lib/counts.ts

@@ -269,6 +269,10 @@ export const selectedCountFields = (
 }
 
 
+export const defaultCountsMode = (definition: string | null): 'summary' | 'details' =>
+    definition === 'history' ? 'details' : 'summary'
+
+
 export const normaliseCountsParams = (
     resource: CountsResource,
     source: URLSearchParams,
@@ -276,10 +280,11 @@ export const normaliseCountsParams = (
   const params = new URLSearchParams (source)
   if (!params.has ('definition'))
     params.set ('definition', params.get ('basis') === 'history' ? 'history' : 'latest')
+  if (!params.has ('current')) params.set ('current', params.get ('at') ? '0' : '1')
   const legacy = params.get ('mode')
   if (['state', 'trend', 'snapshot'].includes (legacy ?? ''))
     params.set ('mode', legacy === 'snapshot' ? 'details' : 'summary')
-  if (!params.has ('mode')) params.set ('mode', 'summary')
+  if (!params.has ('mode')) params.set ('mode', defaultCountsMode (params.get ('definition')))
   if (!params.has ('rows') && params.has ('axis'))
   {
     const field = params.get ('axis') === 'month' ? 'created_at' : params.get ('axis')!
@@ -305,8 +310,7 @@ export const isCountsState = (params: URLSearchParams): boolean =>
 
 
 export const countsUseLatest = (params: URLSearchParams): boolean =>
-    params.get ('current') === '1'
-    || (params.get ('current') !== '0' && !params.get ('at'))
+    params.get ('current') !== '0'
 
 
 export const countsRequestParams = (params: URLSearchParams): URLSearchParams => {

frontend/src/lib/countsClipboard.ts

@@ -1,11 +1,67 @@
 export type CountsClipboard = { text: string; html: string }
+export type CountsClipboardColumn = { label: string; children?: CountsClipboardColumn[] }
+export type CountsClipboardCell = string | CountsClipboardTable
+export type CountsClipboardTable = {
+    columns: CountsClipboardColumn[]; rows: CountsClipboardCell[][] }
 
 
 const escapeHTML = (value: string): string => value.replace (/[&<>"']/g, character =>
     ({ '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;', "'": '&#39;' })[character]!)
 
 
-export const countsClipboard = (rows: string[][], headers = false): CountsClipboard => {
+const columnWidth = (column: CountsClipboardColumn): number =>
+    column.children?.reduce ((sum, child) => sum + columnWidth (child), 0) || 1
+
+
+const headerDepth = (columns: CountsClipboardColumn[]): number =>
+    columns.length === 0 ? 0 : 1 + Math.max (0, ...columns.map (column =>
+	headerDepth (column.children ?? [])))
+
+
+const headerRows = (columns: CountsClipboardColumn[]): string[][] => {
+  const width = columns.reduce ((sum, column) => sum + columnWidth (column), 0)
+  const rows = Array.from ({ length: headerDepth (columns) },
+      () => Array<string> (width).fill (''))
+  const place = (fields: CountsClipboardColumn[], row: number, offset: number) => {
+    for (const field of fields)
+    {
+      rows[row][offset] = field.label
+      if (field.children?.length) place (field.children, row + 1, offset)
+      offset += columnWidth (field)
+    }
+  }
+  if (columns.length) place (columns, 0, 0)
+  return rows
+}
+
+
+const dataRows = (
+    table: CountsClipboardTable,
+    columns = table.columns,
+): string[][] => {
+  if (columns.length === 0) return []
+  return table.rows.flatMap (record => {
+    const blocks = columns.map ((column, index) => {
+      const value = record[index] ?? ''
+      return typeof value === 'string' ? [[value]]
+	  : dataRows (value, column.children ?? value.columns)
+    })
+    const height = Math.max (1, ...blocks.map (block => block.length))
+    // Sibling arrays share the parent row's height; they never form a Cartesian product.
+    return Array.from ({ length: height }, (_, row) => columns.flatMap ((column, index) =>
+	Array.from ({ length: columnWidth (column) }, (_, offset) =>
+	    blocks[index][row]?.[offset] ?? '')))
+  })
+}
+
+
+export const countsClipboard = (
+    source: string[][] | CountsClipboardTable,
+    headers = false,
+): CountsClipboard => {
+  const headings = !Array.isArray (source) && headers ? headerRows (source.columns) : []
+  const rows = Array.isArray (source) ? source : [...headings, ...dataRows (source)]
+  const headingCount = Array.isArray (source) ? (headers ? 1 : 0) : headings.length
   // Excel accepts quoted TSV fields only when delimiters or quotes require them.
   // Prefix formula-like text in both representations, including leading whitespace.
   const safe = rows.map (row => row.map (value => /^\s*[=+@-]/.test (value)
@@ -13,7 +69,7 @@ export const countsClipboard = (rows: string[][], headers = false): CountsClipbo
   const text = safe.map (row => row.map (value => /[\t\r\n"]/.test (value)
       ? `"${value.replaceAll ('"', '""')}"` : value).join ('\t')).join ('\r\n')
   const html = '<html><body><table>' + safe.map ((row, index) => '<tr>' + row.map (value => {
-    const tag = headers && index === 0 ? 'th' : 'td'
+    const tag = index < headingCount ? 'th' : 'td'
     // Preserve time strings, leading zeroes, and user text instead of inferring dates/formulae.
     const numeric = value.length <= 15 && /^(?:0|[1-9]\d*)(?:\.\d+)?$/.test (value)
     const style = numeric ? 'white-space:pre-wrap' : 'white-space:pre-wrap;mso-number-format:"\\@"'

frontend/src/lib/countsDisplay.ts

@@ -5,6 +5,8 @@ import { localisedDateString, msToTime, originalCreatedAtString } from '@/lib/ut
 
 import type { CountColumn, CountField, CountRecord,
 	      CountsResource, CountsVersion } from '@/lib/counts'
+import type { CountsClipboardCell, CountsClipboardColumn, CountsClipboardTable }
+    from '@/lib/countsClipboard'
 import type { CountsDefinition } from '@/lib/countsDefinitions'
 import type { LocaleCode } from '@/lib/locales'
 
@@ -278,3 +280,61 @@ export const countsExportLabels = (
   labels.notRegistered = translateUIMessage ('notRegistered', 'counts', locale).text
   return labels
 }
+
+
+const clipboardColumns = (
+    fields: CountField[],
+    path: string,
+    params: URLSearchParams,
+    locale: LocaleCode,
+): CountsClipboardColumn[] => {
+  const selected = selectedCountChildren (params)
+  return orderedCountFields (fields, params, path)
+      .filter (field => selected.has (`${path}.${field.key}`))
+      .map (field => ({ label: translateUIMessage (field.label, 'counts', locale).text,
+	  children: field.children == null ? undefined : clipboardColumns (
+	      field.children, `${path}.${field.key}`, params, locale) }))
+}
+
+
+export const countsNestedClipboardTable = (
+    rows: CountRecord[],
+    fields: CountField[],
+    path: string,
+    params: URLSearchParams,
+    locale: LocaleCode,
+): CountsClipboardTable => {
+  const selected = selectedCountChildren (params)
+  const columns = orderedCountFields (fields, params, path)
+      .filter (field => selected.has (`${path}.${field.key}`))
+  return {
+      columns: clipboardColumns (fields, path, params, locale),
+      rows: countsNestedOrder (rows, path, params, locale).map (row => columns.map (field =>
+	  field.children == null ? countsLogicalName (row, field.key, locale).text
+	      : countsNestedClipboardTable (row[field.key] as CountRecord[] ?? [],
+		  field.children, `${path}.${field.key}`, params, locale))) }
+}
+
+
+export const countsDetailClipboardTable = (
+    rows: CountsVersion[],
+    fields: CountField[],
+    params: URLSearchParams,
+    locale: LocaleCode,
+    rowStart: number | null = null,
+): CountsClipboardTable => {
+  const columns = fields.map (field => ({
+      label: translateUIMessage (field.label, 'counts', locale).text,
+      children: field.children == null ? undefined : clipboardColumns (
+	  field.children, field.key, params, locale) }))
+  if (rowStart != null)
+    columns.unshift ({ label: translateUIMessage ('rowNumbers', 'counts', locale).text,
+	children: undefined })
+  return { columns, rows: rows.map ((row, index) => {
+    const cells: CountsClipboardCell[] = fields.map (field => field.children == null
+	? countsCellText (row, field.key, locale, params)
+	: countsNestedClipboardTable (countsNestedRows (row, field.key), field.children,
+	    field.key, params, locale))
+    return rowStart == null ? cells : [String (rowStart + index), ...cells]
+  }) }
+}