feat: introduce changelog_helper script

ci/changelog_helper.py

@@ -0,0 +1,86 @@
+import json
+import re
+import subprocess
+import sys
+
+
+def extract_usernames(text):
+    return sorted(set(re.findall(r"@([\w-]+)", text)), key=str.casefold)
+
+
+def github_name(username):
+    # url = f"https://api.github.com/users/{username}"
+    # response = urlopen(url)
+    if username == "renovate":
+        return "Renovate Bot"
+    try:
+        response = subprocess.check_output(
+            [
+                "gh",
+                "api",
+                "-H",
+                "Accept: application/vnd.github+json",
+                "-H",
+                "X-GitHub-Api-Version: 2022-11-28",
+                f"/users/{username}",
+            ]
+        )
+        data = json.loads(response)
+        return data["name"]
+    except Exception as e:
+        print("An error occurred:", str(e))
+
+
+def read_file(file_name):
+    try:
+        with open(file_name, "r") as file:
+            return file.read()
+    except FileNotFoundError:
+        print("File not found")
+    except Exception as e:
+        print("An error occurred:", str(e))
+
+
+def help():
+    print("Usage:")
+    print("  python changelog_helper.py usernames GITHUB_GENERATED_CHANGELOG")
+    print("  python changelog_helper.py replace-nums CHANGELOG_MARKDOWN")
+    print()
+    print(
+        "A logged-in GitHub CLI (https://cli.github.com) is required for the `usernames` subcommand"
+    )
+    print(
+        "For a GitHub-generated changelog, see https://github.com/rust-lang/rustup/releases/new"
+    )
+    sys.exit(1)
+
+
+def main():
+    if len(sys.argv) < 3:
+        help()
+
+    _, subcmd, file_name = sys.argv[:3]
+
+    if subcmd == "usernames":
+        content = read_file(file_name)
+        if not content:
+            return
+        for username in extract_usernames(content):
+            print(f"- {github_name(username)} ({username})")
+    elif subcmd == "replace-nums":
+        content = read_file(file_name)
+        footer = ""
+        if not content:
+            return
+        for match in re.findall(r"(?<=#)(\d+)", content):
+            # Replace issue number with fully-qualified link
+            link = f"[pr#{match}]"
+            footer += f"{link}: https://github.com/rust-lang/rustup/pull/{match}\n"
+            content = content.replace(f"#{match}", link)
+        print(f"{content}\n{footer}")
+    else:
+        help()
+
+
+if __name__ == "__main__":
+    main()