Option to update the PR comment

Author: oacik

action.yml

@@ -19,10 +19,14 @@ inputs:
   title-prefix:
     description: 'A prefix before the title "LCOV of commit..." Optional. Default: ``'
     required: false
+  update-comment:
+    description: Update the existing comment if it exists instead of creating a new one
+    required: false
+    default: false
 runs:
   using: 'node16'
   main: 'dist/main/index.js'
   post: 'dist/post/index.js'
 branding:
   icon: umbrella
-  color: purple
+  color: purple

src/main.js

@@ -9,6 +9,10 @@ const path = require('path');
 
 const events = ['pull_request', 'pull_request_target'];
 
+function commentIdentifier(workflowName) {
+	return `### [LCOV](https://github.com/marketplace/actions/report-lcov) of commit`
+}
+
 async function run() {
   try {
     await exec.exec('sudo apt-get install -y lcov');
@@ -18,6 +22,7 @@ async function run() {
     const globber = await glob.create(coverageFilesPattern);
     const coverageFiles = await globber.glob();
     const title = core.getInput('title');
+    const updateComment = core.getInput('update-comment');
 
     await genhtml(coverageFiles, tmpPath);
 
@@ -40,6 +45,33 @@ async function run() {
         body += `\n:no_entry: ${errorMessage}`;
       }
 
+      const updateGitHubComment = commentId =>
+          octokit.issues.updateComment({
+            repo: github.context.repo.repo,
+            owner: github.context.repo.owner,
+            comment_id: commentId,
+            body,
+          })
+
+      if (updateComment == "true") {
+        const issueComments = await octokit.issues.listComments({
+          repo: github.context.repo.repo,
+          owner: github.context.repo.owner,
+          issue_number: github.context.payload.pull_request.number,
+        })
+
+        const existingComment = issueComments.data.find(comment =>
+            comment.body.includes(commentIdentifier(process.env.GITHUB_WORKFLOW)),
+        )
+
+        if (existingComment) {
+          console.log('Update Comment ID: ' + existingComment.id);
+          await updateGitHubComment(existingComment.id);
+          return
+        }
+        console.log('Comment does not exist, create a new one');
+      }
+
       core.debug("Creating a comment in the PR.")
       await octokit.issues.createComment({
         owner: github.context.repo.owner,