Move commit gst-indent hook to the rootmonorepo-start

This renable at meson setup time the installation of the gst-indent
commit hook. The hooks were kept from gst-devtools as this set supports
both C checks and Python checks.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/904>

1 files changed, 81 insertions, 0 deletions

diff --git a/scripts/git-hooks/pre-commit-python.hook b/scripts/git-hooks/pre-commit-python.hook
new file mode 100755
index 0000000000..14fbc63bfd
--- /dev/null
+++ b/scripts/git-hooks/pre-commit-python.hook
@@ -0,0 +1,81 @@
+#!/usr/bin/env python3
+import os
+import subprocess
+import sys
+import tempfile
+
+NOT_PYCODESTYLE_COMPLIANT_MESSAGE_PRE = \
+    "Your code is not fully pycodestyle compliant and contains"\
+    " the following coding style issues:\n\n"
+
+NOT_PYCODESTYLE_COMPLIANT_MESSAGE_POST = \
+    "Please fix these errors and commit again, you can do so "\
+    "from the root directory automatically like this, assuming the whole "\
+    "file is to be commited:"
+
+NO_PYCODESTYLE_MESSAGE = \
+    "You should install the pycodestyle style checker to be able"\
+    " to commit in this repo.\nIt allows us to garantee that "\
+    "anything that is commited respects the pycodestyle coding style "\
+    "standard.\nYou can install it:\n"\
+    "  * on ubuntu, debian: $sudo apt-get install pycodestyle \n"\
+    "  * on fedora: #yum install python3-pycodestyle \n"\
+    "  * on arch: #pacman -S python-pycodestyle \n"\
+    "  * or `pip install --user pycodestyle`"
+
+
+def system(*args, **kwargs):
+    kwargs.setdefault('stdout', subprocess.PIPE)
+    proc = subprocess.Popen(args, **kwargs)
+    out, err = proc.communicate()
+    if isinstance(out, bytes):
+        out = out.decode()
+    return out
+
+
+def copy_files_to_tmp_dir(files):
+    tempdir = tempfile.mkdtemp()
+    for name in files:
+        filename = os.path.join(tempdir, name)
+        filepath = os.path.dirname(filename)
+        if not os.path.exists(filepath):
+            os.makedirs(filepath)
+        with open(filename, 'w') as f:
+            system('git', 'show', ':' + name, stdout=f)
+
+    return tempdir
+
+
+def main():
+    modified_files = system('git', 'diff-index', '--cached',
+                            '--name-only', 'HEAD', '--diff-filter=ACMR').split("\n")[:-1]
+    non_compliant_files = []
+    output_message = None
+
+    for modified_file in modified_files:
+        try:
+            if not modified_file.endswith(".py"):
+                continue
+            pycodestyle_errors = system('pycodestyle', '--repeat', '--ignore', 'E402,E501,E128,W605,W503', modified_file)
+            if pycodestyle_errors:
+                if output_message is None:
+                    output_message = NOT_PYCODESTYLE_COMPLIANT_MESSAGE_PRE
+                output_message += pycodestyle_errors
+                non_compliant_files.append(modified_file)
+        except OSError as e:
+            output_message = NO_PYCODESTYLE_MESSAGE
+            break
+
+    if output_message:
+        print(output_message)
+        if non_compliant_files:
+            print(NOT_PYCODESTYLE_COMPLIANT_MESSAGE_POST)
+            for non_compliant_file in non_compliant_files:
+                print("autopep8 -i ", non_compliant_file, "; git add ",
+                      non_compliant_file)
+            print("git commit")
+        sys.exit(1)
+
+
+if __name__ == '__main__':
+    main()