action.yml

name: github-comment-pr
author: meysam@developer-friendly.blog
branding:
  color: purple
  icon: edit-3
inputs:
  title:
    description: "Title of the comment (guaranteed uniqueness of the comment on the PR)"
    required: true
  content:
    description: "Content of the comment"
    required: true
  state:
    description: "State of the comment (present or absent)"
    required: false
    default: present
  token:
    description: "GitHub token"
    required: true
description: Comment on PR with custom text message.
runs:
  using: composite
  steps:
    - name: Write content to a temp file
      id: content
      shell: bash
      run: |
        filename=$(mktemp /tmp/comment.XXXXXX)
        cat << 'EOF' > $filename
        ${{ inputs.content }}
        EOF
        echo "filename=$filename" >> $GITHUB_OUTPUT
    - if: inputs.state == 'present'
      name: Comment cost on the PR
      uses: actions/github-script@v7
      with:
        github-token: ${{ inputs.token }}
        script: |
          const fs = require("fs");
          const fileContent = fs.readFileSync("${{ steps.content.outputs.filename }}", "utf8");
          const startingText = "${{ inputs.title }}";
          const updateTime = new Date().toISOString().slice(0, 19);
          const pull = await github.rest.pulls.get({
            pull_number: context.issue.number,
            owner: context.repo.owner,
            repo: context.repo.repo,
          });
          const lastCommitSha = pull.data.head.sha;
          const lastCommitInfo = `Last commit: ${lastCommitSha}`;
          const lastUpdated = `Last updated: ${updateTime}\n${lastCommitInfo}`;
          const contents = `${startingText}\n${lastUpdated}\n${fileContent}`;
          const { data: comments } = await github.rest.issues.listComments({
            issue_number: context.issue.number,
            owner: context.repo.owner,
            repo: context.repo.repo,
          });

          const existingComment = comments.find(
            (comment) =>
              comment.user.login === "github-actions[bot]" &&
              comment.body.startsWith(startingText)
          );
          if (existingComment !== undefined) {
            github.rest.issues.deleteComment({
              comment_id: existingComment.id,
              owner: context.repo.owner,
              repo: context.repo.repo,
            });
          }
          github.rest.issues.createComment({
            issue_number: context.issue.number,
            owner: context.repo.owner,
            repo: context.repo.repo,
            body: contents,
          });
    - if: inputs.state == 'absent'
      name: Delete the comment
      uses: actions/github-script@v7
      with:
        github-token: ${{ inputs.token }}
        script: |
          const startingText = "${{ inputs.title }}";
          const { data: comments } = await github.rest.issues.listComments({
            issue_number: context.issue.number,
            owner: context.repo.owner,
            repo: context.repo.repo,
          });

          const existingComment = comments.find(
            (comment) =>
              comment.user.login === "github-actions[bot]" &&
              comment.body.startsWith(startingText)
          );
          if (existingComment !== undefined) {
            github.rest.issues.deleteComment({
              comment_id: existingComment.id,
              owner: context.repo.owner,
              repo: context.repo.repo,
            });
          }