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>

3 files changed, 207 insertions, 0 deletions

diff --git a/scripts/git-hooks/multi-pre-commit.hook b/scripts/git-hooks/multi-pre-commit.hook
new file mode 100755
index 0000000000..a77d0da21f
--- /dev/null
+++ b/scripts/git-hooks/multi-pre-commit.hook
@@ -0,0 +1,43 @@
+#!/bin/sh
+# Git pre-commit hook that runs multiple hooks specified in $HOOKS.
+# Make sure this script is executable. Bypass hooks with git commit --no-verify.
+
+# This file is inspired by a set of unofficial pre-commit hooks available
+# at github.
+# Link:    https://github.com/githubbrowser/Pre-commit-hooks
+# Contact: David Martin, david.martin.mailbox@googlemail.com
+
+
+###########################################################
+# SETTINGS:
+# pre-commit hooks to be executed. They should be in the same .git/hooks/ folder
+# as this script. Hooks should return 0 if successful and nonzero to cancel the
+# commit. They are executed in the order in which they are listed.
+###########################################################
+
+HOOKS="scripts/git-hooks/pre-commit.hook scripts/git-hooks/pre-commit-python.hook"
+
+# exit on error
+set -e
+
+echo $PWD
+
+for hook in $HOOKS
+do
+    echo "Running hook: $hook"
+    # run hook if it exists
+    # if it returns with nonzero exit with 1 and thus abort the commit
+    if [ -f "$PWD/$hook" ]; then
+        "$PWD/$hook"
+        if [ $? != 0 ]; then
+            exit 1
+        fi
+    else
+        echo "Error: file $hook not found."
+        echo "Aborting commit. Make sure the hook is at $PWD/$hook and executable."
+        echo "You can disable it by removing it from the list"
+        echo "You can skip all pre-commit hooks with --no-verify (not recommended)."
+        exit 1
+    fi
+done
+
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()
diff --git a/scripts/git-hooks/pre-commit.hook b/scripts/git-hooks/pre-commit.hook
new file mode 100755
index 0000000000..3c1062b9e0
--- /dev/null
+++ b/scripts/git-hooks/pre-commit.hook
@@ -0,0 +1,83 @@
+#!/bin/sh
+#
+# Check that the code follows a consistant code style
+#
+
+# Check for existence of indent, and error out if not present.
+# On some *bsd systems the binary seems to be called gnunindent,
+# so check for that first.
+
+version=`gnuindent --version 2>/dev/null`
+if test "x$version" = "x"; then
+  version=`gindent --version 2>/dev/null`
+  if test "x$version" = "x"; then
+    version=`indent --version 2>/dev/null`
+    if test "x$version" = "x"; then
+      echo "GStreamer git pre-commit hook:"
+      echo "Did not find GNU indent, please install it before continuing."
+      exit 1
+    else
+      INDENT=indent
+    fi
+  else
+    INDENT=gindent
+  fi
+else
+  INDENT=gnuindent
+fi
+
+case `$INDENT --version` in
+  GNU*)
+      ;;
+  default)
+      echo "GStreamer git pre-commit hook:"
+      echo "Did not find GNU indent, please install it before continuing."
+      echo "(Found $INDENT, but it doesn't seem to be GNU indent)"
+      exit 1
+      ;;
+esac
+
+INDENT_PARAMETERS="--braces-on-if-line \
+	--case-brace-indentation0 \
+	--case-indentation2 \
+	--braces-after-struct-decl-line \
+	--line-length80 \
+	--no-tabs \
+	--cuddle-else \
+	--dont-line-up-parentheses \
+	--continuation-indentation4 \
+	--honour-newlines \
+	--tab-size8 \
+	--indent-level2 \
+	--leave-preprocessor-space"
+
+echo "--Checking style--"
+for file in `git diff-index --cached --name-only HEAD --diff-filter=ACMR| grep "\.c$"` ; do
+    # nf is the temporary checkout. This makes sure we check against the
+    # revision in the index (and not the checked out version).
+    nf=`git checkout-index --temp ${file} | cut -f 1`
+    newfile=`mktemp /tmp/${nf}.XXXXXX` || exit 1
+    $INDENT ${INDENT_PARAMETERS} \
+	$nf -o $newfile 2>> /dev/null
+    # FIXME: Call indent twice as it tends to do line-breaks
+    # different for every second call.
+    $INDENT ${INDENT_PARAMETERS} \
+        $newfile 2>> /dev/null
+    diff -u -p "${nf}" "${newfile}"
+    r=$?
+    rm "${newfile}"
+    rm "${nf}"
+    if [ $r != 0 ] ; then
+echo "================================================================================================="
+echo " Code style error in: $file                                                                      "
+echo "                                                                                                 "
+echo " Please fix before committing. Don't forget to run git add before trying to commit again.        "
+echo " If the whole file is to be committed, this should work (run from the top-level directory):      "
+echo "                                                                                                 "
+echo "   gst-indent $file; git add $file; git commit"
+echo "                                                                                                 "
+echo "================================================================================================="
+        exit 1
+    fi
+done
+echo "--Checking style pass--"