fetch-icons.yml

name: Fetch missing Silk icons

on:
  push:
    branches: [ main ]
    paths:
      - '404.html'
      - '_layouts/directory.html'
      - '_includes/icon_mapper.html'
      - '.github/workflows/fetch-icons.yml'
  workflow_dispatch:

permissions:
  contents: write

jobs:
  fetch-icons:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          token: ${{ secrets.GITHUB_TOKEN }}

      - name: Fetch missing icons (PowerShell)
        shell: pwsh
        run: |
          $404File = '404.html'
          $LayoutFile = '_layouts/directory.html'
          $MapperFile = '_includes/icon_mapper.html'
          
          $combinedContent = ""

          if (Test-Path $404File) {
            Write-Host "Reading 404 page..."
            $combinedContent += Get-Content $404File -Raw
          }
          
          if (Test-Path $LayoutFile) {
            Write-Host "Reading directory layout..."
            $combinedContent += Get-Content $LayoutFile -Raw
          }
          
          if (Test-Path $MapperFile) {
            Write-Host "Reading icon mapper component..."
            $combinedContent += Get-Content $MapperFile -Raw
          }

          if ($combinedContent -eq "") {
            Write-Host "No 404 page, layout or mapper files found, skipping icon fetch."
            exit 0
          }

          $pattern = "(?<=assign icon = ')[^']+(?=')|(?<=src=""/assets/icons/)[^/]+(?=\.png"")" 
          $icons = [regex]::Matches($combinedContent, $pattern) | ForEach-Object { $_.Value } | Sort-Object -Unique

          Write-Host "Icons referenced in architecture: $($icons -join ', ')"

          $iconDir = 'assets/icons'
          New-Item -ItemType Directory -Force -Path $iconDir | Out-Null

          $placeholderName = '__placeholder'
          $placeholderFile = "$iconDir/$placeholderName.png"
          $placeholderUrl = 'https://upload.wikimedia.org/wikipedia/commons/8/8c/Transparent.png'

          $changedFiles = @()
          $fallbackIcons = @()

          if (-not (Test-Path $placeholderFile)) {
            Write-Host "Downloading placeholder icon from $placeholderUrl ..."
            Invoke-WebRequest -Uri $placeholderUrl -OutFile $placeholderFile -ErrorAction Stop
            $changedFiles += $placeholderFile
          }

          foreach ($icon in $icons) {
            if ($icon -eq $placeholderName) {
              continue
            }

            if ($icon -eq "{{ icon }}" -or $icon -eq "{{ icon_name }}") {
              continue
            }

            $iconFile = "$iconDir/$icon.png"
            $item = Get-Item -LiteralPath $iconFile -ErrorAction SilentlyContinue
            $isLink = $null -ne $item -and $null -ne $item.LinkType
            $needsDownload = ($null -eq $item) -or $isLink

            if ($needsDownload) {
              $url = "https://raw.githubusercontent.com/markjames/famfamfam-silk-icons/master/icons/$icon.png"
              $tempFile = "$iconFile.download"
              Write-Host "Downloading $icon.png from $url ..."
              try {
                Invoke-WebRequest -Uri $url -OutFile $tempFile -ErrorAction Stop
                if (Test-Path $iconFile) { Remove-Item -LiteralPath $iconFile -Force }
                Move-Item -LiteralPath $tempFile -Destination $iconFile -Force
                $changedFiles += $iconFile
                Write-Host "  -> saved"
              } catch {
                if (Test-Path $tempFile) { Remove-Item -LiteralPath $tempFile -Force }
                Write-Warning "Failed to download $icon.png : $_"
                if (Test-Path $iconFile) { Remove-Item -LiteralPath $iconFile -Force }
                try {
                  New-Item -ItemType SymbolicLink -Path $iconFile -Target "$placeholderName.png" -Force | Out-Null
                  Write-Host "  -> linked to placeholder"
                } catch {
                  Copy-Item -LiteralPath $placeholderFile -Destination $iconFile -Force
                  Write-Host "  -> copied placeholder"
                }
                $changedFiles += $iconFile
                $fallbackIcons += "$icon.png"
              }
            } else {
              Write-Host "$icon.png already exists, skipping."
            }
          }

          if ($fallbackIcons.Count -gt 0) {
            Write-Warning "Using placeholder for: $($fallbackIcons -join ', ')"
          }

          if ($changedFiles.Count -gt 0) {
            Write-Host "Committing icon file updates..."
            git config user.name "github-actions[bot]"
            git config user.email "github-actions[bot]@users.noreply.github.com"
            git add assets/icons/
            git commit -m "Update directory listing icons [skip ci]"
            git push
          } else {
            Write-Host "All icons already present, nothing to commit."
          }