add option to delete the previous comment and create a new one

__tests__/comment.test.ts

@@ -1,7 +1,8 @@
 import {
   findPreviousComment,
   createComment,
-  updateComment
+  updateComment,
+  deleteComment
 } from "../src/comment";
 const repo = {};
 it("findPreviousComment", async () => {
@@ -97,3 +98,30 @@ it("createComment", async () => {
     body: "<!-- Sticky Pull Request CommentTypeA -->\nhello there"
   });
 });
+
+it("removeComment", async () => {
+  const octokit = {
+    issues: {
+      deleteComment: jest.fn(() => Promise.resolve())
+    }
+  };
+  expect(
+    await deleteComment(octokit, repo, 456)
+  ).toBeUndefined();
+  expect(octokit.issues.deleteComment).toBeCalledWith({
+    comment_id: 456
+  });
+  expect(
+    await deleteComment(octokit, repo, 456)
+  ).toBeUndefined();
+  expect(octokit.issues.deleteComment).toBeCalledWith({
+    comment_id: 456
+  });
+
+  expect(
+    await deleteComment(octokit, repo, 456)
+  ).toBeUndefined();
+  expect(octokit.issues.deleteComment).toBeCalledWith({
+    comment_id: 456
+  });
+});

action.yml

@@ -8,6 +8,9 @@ inputs:
   append:
     description: "Indicate if new comment messages should be appended to previous comment message"
     required: false
+  replace:
+    description: "Indicate if previous comment should be removed before creating a new comment"
+    required: false
   message:
     description: "comment message"
     required: false

src/comment.ts

@@ -17,10 +17,16 @@ export async function updateComment(octokit, repo, comment_id, body, header, pre
     body: previousBody ? `${previousBody}\n${body}` : `${headerComment(header)}\n${body}`
   });
 }
-export async function createComment(octokit, repo, issue_number, body, header) {
+export async function createComment(octokit, repo, issue_number, body, header, previousBody?) {
   await octokit.issues.createComment({
     ...repo,
     issue_number,
-    body: `${headerComment(header)}\n${body}`
+    body:  previousBody ? `${previousBody}\n${body}` : `${headerComment(header)}\n${body}`
+  });
+}
+export async function deleteComment(octokit, repo, comment_id) {
+  await octokit.issues.deleteComment({
+    ...repo,
+    comment_id,
   });
 }

src/main.ts

@@ -1,6 +1,6 @@
 import * as core from "@actions/core";
 import { context, GitHub } from "@actions/github";
-import { findPreviousComment, createComment, updateComment } from "./comment";
+import { findPreviousComment, createComment, updateComment, deleteComment } from "./comment";
 import { readFileSync } from 'fs';
 
 async function run() {
@@ -18,6 +18,7 @@ async function run() {
     const path = core.getInput("path", { required: false });
     const header = core.getInput("header", { required: false }) || "";
     const append = core.getInput("append", { required: false }) || false;
+    const replace = core.getInput("replace", { required: false }) || false;
     const githubToken = core.getInput("GITHUB_TOKEN", { required: true });
     const octokit = new GitHub(githubToken);
     const previous = await findPreviousComment(octokit, repo, number, header);
@@ -34,11 +35,15 @@ async function run() {
       body = message;
     }
 
+    let previousBody;
+    if (append && previous) previousBody = previous.body;
+
     if (previous) {
-      if (append) {
+      if (replace) {
-        await updateComment(octokit, repo, previous.id, body, header, previous.body);
+        await deleteComment(octokit, repo, previous.id);
+        await createComment(octokit, repo, number, body, header, previousBody);
       } else {
-        await updateComment(octokit, repo, previous.id, body, header);
+        await updateComment(octokit, repo, previous.id, body, header, previousBody);
       }
     } else {
       await createComment(octokit, repo, number, body, header);