action.yml

name: "LOC Graph Action"
description: "Generate an SVG chart of Lines of Code over time from commit history"
author: "Maxim Oransky"
branding:
  icon: 'trending-up'
  color: 'green'
inputs:
  output_json:
    description: "Path to cached LOC history JSON"
    default: ".github/loc_history.json"
    required: false
  theme:
    description: "Theme for fallback SVG (light or dark)"
    default: "light"
    required: false
  fallback_theme:
    description: "Deprecated: use 'theme' instead"
    default: ""
    required: false
  date_format:
    description: "Date format for multi-day projects (Python strftime)"
    default: "%d.%m.%Y"
    required: false
  time_format:
    description: "Time format for same-day commits (Python strftime)"
    default: "%H:%M"
    required: false
  exclude:
    description: "Additional directories to exclude from counting (comma-separated)"
    default: ""
    required: false
runs:
  using: "composite"
  steps:
    - name: Check for real commits since last LOC update
      id: skip_check
      shell: bash
      run: |
        LAST_LOC=$(git log --all --oneline --grep="Update LOC graph" -1 --format="%H" 2>/dev/null || true)
        if [ -n "$LAST_LOC" ]; then
          REAL=$(git log "$LAST_LOC"..HEAD --oneline --invert-grep --grep="Update LOC graph" | wc -l | tr -d ' ')
        else
          REAL=1
        fi
        echo "real_commits=$REAL" >> "$GITHUB_OUTPUT"
        if [ "$REAL" = "0" ]; then
          echo "No real commits since last LOC update, skipping"
        else
          echo "Found $REAL real commit(s), proceeding"
        fi

    - name: Ensure full git history
      if: steps.skip_check.outputs.real_commits != '0'
      shell: bash
      run: |
        if [ "$(git rev-parse --is-shallow-repository)" = "true" ]; then
          git fetch --unshallow --tags
        fi

    - name: Install cloc
      if: steps.skip_check.outputs.real_commits != '0'
      shell: bash
      run: |
        sudo apt-get install -y cloc --no-install-recommends

    - name: Run LOC graph generator
      if: steps.skip_check.outputs.real_commits != '0'
      id: loc_graph
      shell: bash
      run: |
        FALLBACK_THEME="${{ inputs.theme || inputs.fallback_theme || 'light' }}" \
        DATE_FORMAT="${{ inputs.date_format }}" \
        TIME_FORMAT="${{ inputs.time_format }}" \
        EXCLUDE="${{ inputs.exclude }}" \
        python3 "${GITHUB_ACTION_PATH}/scripts/loc_graph.py" && echo "changed=true" >> $GITHUB_OUTPUT || echo "changed=false" >> $GITHUB_OUTPUT

    - name: Commit artifacts if changed
      if: steps.skip_check.outputs.real_commits != '0' && steps.loc_graph.outputs.changed == 'true'
      shell: bash
      run: |
        git config user.name "github-actions[bot]"
        git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
        git add ".github/loc-history.svg" ".github/loc-history-light.svg" ".github/loc-history-dark.svg" "${{ inputs.output_json }}" || true
        if ! git diff --cached --quiet; then
          git commit -m "Update LOC graph [skip ci]"
          git push
        fi