KAFKA-18942: Add reviewers to PR body with committer-tools (#19168)

Allow `reviewers.py` to set the "Reviewers:" line in a PR body.

Reviewers: Chia-Ping Tsai <chia7712@gmail.com>, David Arthur <mumrah@gmail.com>

committer-tools/README.md

@@ -46,11 +46,13 @@ See: https://cli.github.com/
 brew install gh
 ```
 
-## Find Reviewers
+## Find Reviewers and Update to PR body
 
 The reviewers.py script is used to simplify the process of producing our "Reviewers:"
-Git trailer. It parses the Git log to gather a set of "Authors" and "Reviewers". 
+Git trailer to PR body. It parses the Git log to gather a set of "Authors" and "Reviewers". 
 Some simple string prefix matching is done to find candidates. 
+After entering the pull request number, the script updates the "Reviewers:" trailer accordingly. 
+If the PR body already contains a "Reviewers:" trailer, the script replaces it with the updated list of reviewers.
 
 Usage:
 

committer-tools/reviewers.py

@@ -1,6 +1,10 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
+import json
+import shlex
+import subprocess
+import tempfile
 #
 # Licensed to the Apache Software Foundation (ASF) under one or more
 # contributor license agreements.  See the NOTICE file distributed with
@@ -35,6 +39,42 @@ def prompt_for_user():
             return clean_input
 
 
+def update_trailers(body, trailer):
+    with tempfile.NamedTemporaryFile() as fp:
+        fp.write(body.encode())
+        fp.flush()
+        cmd = f"git interpret-trailers --if-exists replace --trailer '{trailer}' {fp.name} "
+        p = subprocess.run(shlex.split(cmd), capture_output=True, text=True)
+        fp.close()
+
+    return p.stdout
+
+
+def append_message_to_pr_body(pr: int , message: str):
+    try:
+        pr_url = f"https://github.com/apache/kafka/pull/{pr}"
+        cmd_get_pr = f"gh pr view {pr_url} --json title,body"
+        result = subprocess.run(shlex.split(cmd_get_pr), capture_output=True, text=True, check=True)
+        current_pr_body = json.loads(result.stdout).get("body", {}).strip() + "\n"
+        pr_title = json.loads(result.stdout).get("title", {})
+        updated_pr_body = update_trailers(current_pr_body, message)
+    except subprocess.CalledProcessError as e:
+        print("Failed to retrieve PR body:", e.stderr)
+        return
+
+    print(f"""New PR body will be:\n\n---\n{updated_pr_body}---\n""")
+    choice = input(f'Update the body of "{pr_title}"? (y/n): ').strip().lower()
+    if choice in ['n', 'no']:
+        return
+
+    try:
+        cmd_edit_body = f"gh pr edit {pr_url} --body {shlex.quote(updated_pr_body)}"
+        subprocess.run(shlex.split(cmd_edit_body), check=True)
+        print("PR body updated successfully!")
+    except subprocess.CalledProcessError as e:
+        print("Failed to update PR body:", e.stderr)
+
+
 if __name__ == "__main__":
     print("Utility to help generate 'Reviewers' string for Pull Requests. Use Ctrl+D or Ctrl+C to exit")
 
@@ -87,9 +127,12 @@ if __name__ == "__main__":
             continue
 
     if selected_reviewers:
-        out = "\n\nReviewers: "
-        out += ", ".join([f"{name} <{email}>" for name, email, _ in selected_reviewers])
-        out += "\n"
-        print(out)
-
+        reviewer_message = "Reviewers: "
+        reviewer_message += ", ".join([f"{name} <{email}>" for name, email, _ in selected_reviewers])
+        print(f"\n\n{reviewer_message}\n")
 
+        try:
+            pr_number = int(input("\nPull Request (Ctrl+D or Ctrl+C to skip): "))
+            append_message_to_pr_body(pr_number, reviewer_message)
+        except (EOFError, KeyboardInterrupt):
+            exit(0)