deploy.yml

name: Build & Deploy to GitHub Pages

on:
  push:
    branches: [main]
    paths:
      # Rebuild whenever source content or templates change
      - 'posts/**'
      - 'src/templates/**'
      - 'config/**'
      - 'scripts/**'
      - 'package.json'
      - 'template.html'
      # Also run when the workflow itself is first added or updated
      - '.github/workflows/deploy.yml'

  # Allow manual trigger from the Actions tab
  workflow_dispatch:

# Grant the GITHUB_TOKEN permission to deploy Pages
permissions:
  contents: read
  pages: write
  id-token: write

# Only one deployment at a time; cancel any in-progress run on a new push
concurrency:
  group: pages
  cancel-in-progress: true

jobs:
  build:
    name: Build site
    runs-on: ubuntu-latest

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          fetch-depth: 2   # need two commits to detect changed files

      - name: Set up Node.js
        uses: actions/setup-node@v4
        with:
          node-version: '20'
          cache: 'npm'

      - name: Install dependencies
        run: npm ci

      # Detect which files changed vs the previous commit so we can do a
      # targeted rebuild instead of always rebuilding everything.
      - name: Detect changed files
        id: changed
        run: |
          # On a workflow_dispatch there is no "previous" commit to diff
          if [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
            echo "CHANGED_FILES=" >> "$GITHUB_ENV"
            echo "mode=full"      >> "$GITHUB_OUTPUT"
          else
            FILES=$(git diff --name-only HEAD~1 HEAD)
            echo "CHANGED_FILES<<EOF"  >> "$GITHUB_ENV"
            echo "$FILES"              >> "$GITHUB_ENV"
            echo "EOF"                 >> "$GITHUB_ENV"

            # If any template / config changed → force full rebuild
            if echo "$FILES" | grep -qE '^(src/templates/|config/|template\.html)'; then
              echo "mode=full"        >> "$GITHUB_OUTPUT"
            else
              echo "mode=incremental" >> "$GITHUB_OUTPUT"
            fi
          fi

      - name: Build site (full)
        if: steps.changed.outputs.mode == 'full' || github.event_name == 'workflow_dispatch'
        run: npm run build

      - name: Build site (incremental — posts only)
        if: steps.changed.outputs.mode == 'incremental'
        run: npm run build:changed

      - name: Upload Pages artifact
        uses: actions/upload-pages-artifact@v3
        with:
          path: pages

  deploy:
    name: Deploy to GitHub Pages
    needs: build
    runs-on: ubuntu-latest

    environment:
      name: github-pages
      url: ${{ steps.deploy.outputs.page_url }}

    steps:
      - name: Deploy to GitHub Pages
        id: deploy
        uses: actions/deploy-pages@v4

  archive:
    name: Archive to Wayback Machine / archive.today
    needs: deploy
    # Only run if archiving is enabled in config
    runs-on: ubuntu-latest
    if: ${{ vars.ARCHIVE_ENABLED == 'true' }}

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Read site URL from config
        id: cfg
        run: |
          URL=$(node -e "const c=require('./config/config.json'); console.log(c.site?.url||'')")
          echo "site_url=$URL" >> "$GITHUB_OUTPUT"

      - name: Submit to archive.org (Wayback Machine)
        if: ${{ vars.ARCHIVE_ORG != 'false' }}
        # Fire-and-forget: use --max-time so a slow API never blocks the run
        run: |
          SITE="${{ steps.cfg.outputs.site_url }}"
          if [ -z "$SITE" ]; then
            echo "No site URL configured; skipping archive.org submission."
            exit 0
          fi
          echo "Submitting $SITE to archive.org…"
          # archive.org save API — no key required for basic snapshots
          curl --silent --max-time 30 --fail-with-body \
            "https://web.archive.org/save/$SITE" || true
        # Don't fail the workflow if archiving is unavailable
        continue-on-error: true

      - name: Submit to archive.today
        if: ${{ vars.ARCHIVE_TODAY != 'false' }}
        run: |
          SITE="${{ steps.cfg.outputs.site_url }}"
          if [ -z "$SITE" ]; then
            echo "No site URL configured; skipping archive.today submission."
            exit 0
          fi
          echo "Submitting $SITE to archive.today…"
          # archive.today submit endpoint
          curl --silent --max-time 30 --location \
            --data "url=${SITE}&anyway=1" \
            "https://archive.today/submit/" || true
        continue-on-error: true