name: PackSVGs

on:
  push:
    paths:
      - 'src/svgs/*'
      - 'bin/scripts/generate-original-source.py'
      - 'bin/scripts/optimize-original-source.sh'
  workflow_dispatch:

jobs:
  create-symbols-font:
    runs-on: ubuntu-22.04
    steps:
      - uses: actions/checkout@v3
      - name: Fetch dependencies
        run: |
          sudo apt update -y -q
          # ttfdump comes with texlive-binaries
          # We use ttfdump instead of showttf, because the later core dumps at the moment
          sudo apt install python3-fontforge inkscape texlive-binaries dc -y -q

      - name: Simplify the SVGs
        id: optimize
        run: |
          cd bin/scripts
          ./optimize-original-source.sh doit | tee optlog.txt
          changenum=$(tail -n 1 optlog.txt | sed -E 's/[^0-9]*([0-9]+).*/\1/')
          echo "Script claims number of changed files: ${changenum}"
          echo "num_of_files=${changenum}" >> $GITHUB_OUTPUT

      - name: Commit simplified SVGs back to repo
        if: steps.optimize.outputs.num_of_files > 0
        uses: EndBug/add-and-commit@v9
        with:
          fetch: false
          add: 'src/svgs'
          message: "[ci] Simplify original-source source glyphs"
          committer_name: GitHub Actions
          committer_email: 41898282+github-actions[bot]@users.noreply.github.com

      - name: Dummy create Seti-and-original-symbols font and CHECK FOR CHANGES
        id: compare_font
        run: |
          cd bin/scripts
          echo "OLD_FONT_LS=$(ls -l ../../src/glyphs/original-source.otf)" >> $GITHUB_ENV
          # First we create a 'test' font with the same timestamp as the old to see if
          # there are any differences (apart from the timestamp)
          export CURRENT_FONT_DATE=$(ttfdump -t head ../../src/glyphs/original-source.otf | \
            grep -E '[^a-z]created:.*0x' | sed 's/.*x//' | tr 'a-f' 'A-F')
          echo "Font creation date (1904): 0x${CURRENT_FONT_DATE}"
          # The timestamp in the HEAD table is given in 1904 seconds, we convert that
          # to 1970 (unix) seconds.
          export SOURCE_DATE_EPOCH=$(dc -e "16i ${CURRENT_FONT_DATE} Ai 86400 24107 * - p")
          echo "Font creation date (1970): ${SOURCE_DATE_EPOCH}"
          echo "Create font with previous timestamp"
          ./generate-original-source.py
          # Check if the new font file has changed
          CHANGE=$(git diff --quiet ../../src/glyphs/original-source.otf && echo false || echo true)
          echo "Change detected: ${CHANGE}"
          echo "changed=${CHANGE}" >> $GITHUB_OUTPUT

      - name: Create Seti-and-original-symbols font for real with current timestamp
        if: steps.compare_font.outputs.changed == 'true'
        run: |
          cd bin/scripts
          echo "Create font with current timestamp"
          # We need to force creation and modification timestamp to be identical
          # to make the compare_font step work next time
          export SOURCE_DATE_EPOCH=$(date +%s)
          ./generate-original-source.py
          echo "${OLD_FONT_LS}"
          ls -l ../../src/glyphs/original-source.otf

      - name: Commit created font back to repo
        if: steps.compare_font.outputs.changed == 'true'
        uses: EndBug/add-and-commit@v9
        with:
          fetch: false
          add: "['src/glyphs/original-source.otf', 'bin/scripts/lib/i_seti.sh']"
          message: "[ci] Rebuild original-source font"
          committer_name: GitHub Actions
          committer_email: 41898282+github-actions[bot]@users.noreply.github.com