Create step to auto-update Luau

.github/workflows/update-luau-version.yml

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+name: Update Luau Version
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: "10 0 * * *" # Runs at 00:10 UTC every day
+
+jobs:
+  sync:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Generate App Token
+        id: generate_token
+        uses: actions/create-github-app-token@v1
+        with:
+          app-id: ${{ secrets.TYPES_GENERATOR_APP_ID }}
+          private-key: ${{ secrets.TYPES_GENERATOR_PRIVATE_KEY }}
+
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          submodules: true
+
+      - name: Update Luau Version
+        run: echo "LUAU_VERSION=$(scripts/update_luau_and_changelog.py)" >> $GITHUB_ENV
+
+      - name: Create Pull Request
+        id: create_pull_request
+        uses: peter-evans/create-pull-request@v6
+        with:
+          title: Sync to upstream Luau $LUAU_VERSION
+          body: |
+            Sync to upstream Luau $LUAU_VERSION
+            - This pull request is **auto-generated**
+          branch: auto/update-luau
+          commit-message: Sync to upstream Luau $LUAU_VERSION
+          base: main
+          token: ${{ steps.generate_token.outputs.token }}
+
+    #   - name: Enable Pull Request Automerge
+    #     run: gh pr merge --squash --auto "${{ steps.create_pull_request.outputs.pull-request-number }}"
+    #     env:
+    #       GITHUB_TOKEN: ${{ steps.generate_token.outputs.token }}

scripts/update_luau_and_changelog.py

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+#!/usr/bin/env python3
+# Run in root of repository
+# scripts/update_luau_and_changelog.py
+
+import subprocess
+import sys
+
+CHANGELOG_FILE = "CHANGELOG.md"
+
+# Update submodule
+subprocess.run(["git", "submodule", "update", "--remote"], check=True)
+
+# Check for changes
+if not subprocess.check_output(["git", "status", "--porcelain", "-uno"]):
+    print("No changes", file=sys.stderr)
+    exit(0)
+
+# Current luau version
+VERSION = subprocess.check_output(
+    ["git", "describe", "--tags", "--abbrev=0"], cwd="luau"
+).decode()
+MESSAGE = f"Sync to upstream Luau {VERSION}"
+
+# Read the current contents of the changelog file
+file_path = CHANGELOG_FILE
+with open(file_path, "r") as file:
+    lines = file.readlines()
+
+# Initialize variables
+unreleased_section_found = False
+changed_subcategory_found = False
+changed_inserted = False
+updated_lines: list[str] = []
+updated = False
+
+for line in lines:
+    if updated:
+        updated_lines.append(line)
+        continue
+
+    if line.startswith("## [Unreleased]"):
+        unreleased_section_found = True
+        updated_lines.append(line)
+        continue
+
+    if unreleased_section_found:
+        if changed_subcategory_found:
+            if line.startswith("- Sync to upstream Luau "):
+                updated_lines.append(f"- {MESSAGE}")
+                updated = True
+                continue
+            elif line.startswith("##"):
+                # Changed category ended
+                if updated_lines[-1].strip() == "":
+                    updated_lines.pop()
+                updated_lines.append(f"- {MESSAGE}")
+                updated_lines.append("\n")
+                updated_lines.append(line)
+                updated = True
+                continue
+            updated_lines.append(line)
+            continue
+
+        if line.startswith("### Changed"):
+            changed_subcategory_found = True
+            updated_lines.append(line)
+            continue
+
+        if line.startswith("## "):
+            updated_lines.append("### Changed\n")
+            updated_lines.append("\n")
+            updated_lines.append(f"- {MESSAGE}")
+            updated_lines.append("\n")
+            updated_lines.append(line)
+            updated = True
+            continue
+
+    # If Unreleased section not found, create it at the beginning
+    if line.startswith("## "):
+        # If the first section is not Unreleased, add it and stop further processing
+        if not unreleased_section_found:
+            updated_lines.append("## [Unreleased]\n")
+            updated_lines.append("### Changed\n")
+            updated_lines.append(f"- {MESSAGE}")
+            unreleased_section_found = True
+            updated = True
+        updated_lines.append(line)
+    else:
+        updated_lines.append(line)
+
+# Write the updated contents back to the file
+with open(file_path, "w") as file:
+    file.writelines(updated_lines)
+
+print(VERSION)