Check format: only check modified files, v2 (#1680)

* Check format: only check modified files, v2

* cheeky z_play edit

* format

* rename z_play.c -> z_play_.c

* Revert "rename z_play.c -> z_play_.c"

This reverts commit 9da9e76309.

* rm z_moji.c

* Revert "rm z_moji.c"

This reverts commit bd2d5acb5a.

tools/check_format.py

@@ -0,0 +1,77 @@
+# SPDX-FileCopyrightText: 2024 zeldaret
+# SPDX-License-Identifier: CC0-1.0
+
+import subprocess
+import argparse
+import difflib
+import multiprocessing
+import glob
+import os.path
+import sys
+
+sys.path.insert(0, os.curdir)
+import format
+
+sys.path.pop(0)
+
+
+def get_git_status():
+    return subprocess.check_output("git status --porcelain".split(), text=True)
+
+
+def get_modified_files_to_format(compare_to):
+    modified_files_str = subprocess.check_output(
+        ["git", "diff", "--name-only", compare_to], text=True
+    )
+    modified_files = modified_files_str.splitlines()
+    modified_c_files = [
+        f
+        for f in modified_files
+        if f.startswith("src" + os.path.sep) and f.endswith(".c")
+    ]
+    modified_c_files_existing = [f for f in modified_c_files if os.path.exists(f)]
+    return modified_c_files_existing
+
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--verbose", action="store_true")
+    parser.add_argument("--compare-to", dest="compare_to")
+    args = parser.parse_args()
+
+    if args.compare_to:
+        src_files = get_modified_files_to_format(args.compare_to)
+        if args.verbose:
+            print("Formatting specific files:", len(src_files), src_files)
+        if not src_files:
+            if args.verbose:
+                print("Nothing to format")
+            exit(0)
+    else:
+        src_files = glob.glob("src/**/*.c", recursive=True)
+
+    nb_jobs = multiprocessing.cpu_count()
+
+    git_status_pre = get_git_status()
+
+    format.format_files(src_files, [], nb_jobs)
+
+    git_status_post = get_git_status()
+
+    if git_status_pre != git_status_post:
+        print(
+            "Misformatted files found."
+            " Run ./format.py and verify codegen is not impacted."
+        )
+        for l in difflib.unified_diff(
+            git_status_pre.splitlines(),
+            git_status_post.splitlines(),
+            "Old git status",
+            "New git status",
+        ):
+            print(l)
+        exit(1)
+
+
+if __name__ == "__main__":
+    main()