pre-commit: Use qmlformat by default

.github/workflows/pre-commit.yml

@@ -25,24 +25,16 @@ jobs:
       # on Pull Requests!).
       env:
         SKIP: end-of-file-fixer,trailing-whitespace,clang-format,eslint,no-commit-to-branch
-      with:
-        # Enable extra hooks that require special system dependencies that we
-        # cannot expect to be installed on all contributor's systems.
-        extra_args: --hook-stage manual --all-files
 
     - name: "Detect code style issues (pull_request)"
       uses: pre-commit/action@v2.0.0
       if: github.event_name == 'pull_request'
       env:
         SKIP: no-commit-to-branch
       with:
-        # Enable extra hooks that require special system dependencies that are
-        # available in our custom docker container, but cannot be expected to
-        # be installed on all contributor's systems.
-        #
         # HEAD is the not yet integrated PR merge commit +refs/pull/xxxx/merge
         # HEAD^1 is the PR target branch and HEAD^2 is the HEAD of the source branch
-        extra_args: --hook-stage manual --from-ref HEAD^1 --to-ref HEAD
+        extra_args: --from-ref HEAD^1 --to-ref HEAD
 
     - name: "Generate patch file"
       if: failure()

.pre-commit-config.yaml

@@ -126,16 +126,11 @@ repos:
     - manual
   - id: qmlformat
     name: qmlformat
-    entry: qmlformat -i
+    entry: tools/qmlformat.py
     pass_filenames: true
-    require_serial: true
     language: system
     types: [text]
     files: ^.*\.qml$
-    # Not enabled in commit stage by default, because qmlformat requires Qt
-    # 5.15 to be installed
-    stages:
-    - manual
   - id: qmllint
     name: qmllint
     entry: qmllint

tools/qmlformat.py

@@ -0,0 +1,37 @@
+#!/usr/bin/env python3
+"""
+Small qmlformat wrapper that warns the user if the tool is not installed.
+"""
+import argparse
+import shutil
+import subprocess
+import pathlib
+import sys
+
+QMLFORMAT_MISSING_MESSAGE = """
+qmlformat is not installed. It is included in Qt 5.15 and later. If that Qt
+version is not available on your system, please use the SKIP environment
+variable when committing:
+
+    $ SKIP=qmlformat git commit
+"""
+
+
+def main(argv=None):
+    qmlformat_executable = shutil.which("qmlformat")
+    if not qmlformat_executable:
+        print(QMLFORMAT_MISSING_MESSAGE.strip(), file=sys.stderr)
+        return 1
+
+    parser = argparse.ArgumentParser()
+    parser.add_argument("file", nargs="+", type=pathlib.Path)
+    args = parser.parse_args(argv)
+
+    for filename in args.file:
+        subprocess.call((qmlformat_executable, "-i", filename))
+
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())