list-changed-pages.yml

name: Comment based on changed pages (Vercel Deploy URLs + Redirect Suggestions)

on:
  pull_request:

jobs:
  post-comment-with-links-to-changed-pages:
    name: Create or Update
    runs-on: ubuntu-latest

    steps:
      - name: Checkout
        uses: actions/checkout@v3

      - name: Get list of changed files
        id: files
        uses: Ana06/get-changed-files@v1.2 # it's a fork of jitterbit/get-changed-files@v1 which works better with pull requests
      - name: List Vercel Deploy URLs
        id: links
        # Note that this uses `%0A` instead of `\n` because of https://github.com/peter-evans/create-or-update-comment#setting-the-comment-body-from-a-file which I could not get to work here - but this brute force method does.
        run: |
          body="This PR changes the following pages (Vercel Preview Deploy links):%0A%0A"
          no_changed_pages="%0A- This PR does not change any pages the [GH Actions workflow](https://github.com/prisma/docs/blob/main/.github/workflows/list-changed-pages.yml) could detect."
          vercelLinks="Changed Vercel links"
          body="$body%0A%0A$vercelLinks"
          for changed_file in ${{ steps.files.outputs.all }}; do
            if [[ $changed_file == content/* ]]
            then
              no_changed_pages=""

              cleaned_file=$(echo "$changed_file" | sed -E 's:content/:/:g' | sed -E 's:/index.mdx::g' | sed -e 's/.mdx//g' | sed -E 's:/[0-9]+-:/:g' )
              branch_name=$(echo "${{github.event.pull_request.head.ref}}" |  sed -e 's/\//-/g')
              # TODO special case for images and similar non .mdx files

              # Output inside the action
              echo "- https://docs-git-${branch_name}-prisma.vercel.app$cleaned_file"

              # Also collect into string
              linksVercel="%0A- [/docs$cleaned_file](https://docs-git-${branch_name}-prisma.vercel.app$cleaned_file) ([currently](https://prisma.io/docs$cleaned_file))"
              body="$body$linksVercel"
            fi
          done

          body="$body$no_changed_pages"
          body="$body%0A%0A(Note that links will only be valid after Vercel preview deploy succeeded)"
          echo "::set-output name=body::$body"

      - name: Find existing comment (links)
        uses: peter-evans/find-comment@v1
        id: fc
        with:
          issue-number: ${{ github.event.pull_request.number }}
          comment-author: 'github-actions[bot]'
          body-includes: following pages

      - name: Create comment (links)
        if: steps.fc.outputs.comment-id == ''
        uses: peter-evans/create-or-update-comment@v1
        with:
          issue-number: ${{ github.event.pull_request.number }}
          body: ${{ steps.links.outputs.body }}

      - name: Update comment (links)
        if: steps.fc.outputs.comment-id != ''
        uses: peter-evans/create-or-update-comment@v1
        with:
          comment-id: ${{ steps.fc.outputs.comment-id }}
          body: ${{ steps.links.outputs.body }}
          edit-mode: replace

      ### REDIRECTS ###

      - name: Create suggested redirects
        id: redirects
        run: |
          bash .github/workflows/scripts/generate-redirects.sh

      - name: Find existing comment (redirects)
        uses: peter-evans/find-comment@v1
        id: fc2
        with:
          issue-number: ${{ github.event.pull_request.number }}
          comment-author: 'github-actions[bot]'
          body-includes: following redirects

      - name: Create comment (redirects)
        if: steps.fc2.outputs.comment-id == ''
        uses: peter-evans/create-or-update-comment@v1
        with:
          issue-number: ${{ github.event.pull_request.number }}
          body: ${{ steps.redirects.outputs.body }}

      - name: Update comment (redirects)
        if: steps.fc2.outputs.comment-id != ''
        uses: peter-evans/create-or-update-comment@v1
        with:
          comment-id: ${{ steps.fc2.outputs.comment-id }}
          body: ${{ steps.redirects.outputs.body }}
          edit-mode: replace