Add cmake function to configure git pre-commit hooks

This will allow us to force QS checks before
the developer commits a change. Currently only
clang-format is supported, but as on #plasma and
https://phabricator.kde.org/T11214 discussed we
might want to add different formatters.

By making the checks configurable we are flexible
and can easily extend it.

2 files changed, 16 insertions, 0 deletions

diff --git a/kde-modules/kde-git-commit-hooks/clang-format.sh b/kde-modules/kde-git-commit-hooks/clang-format.sh
new file mode 100755
index 00000000..d351e3cd
--- /dev/null
+++ b/kde-modules/kde-git-commit-hooks/clang-format.sh
@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+
+# Based on okular/hooks/pre-commit, credits go to Albert Astals Cid
+
+readonly output=$(git clang-format -v --diff)
+
+if [[ "$output" == *"no modified files to format"* ]]; then exit 0; fi
+if [[ "$output" == *"clang-format did not modify any files"* ]]; then exit 0; fi
+
+echo "ERROR: You have unformatted changes, please format your files. You can do this using the following commands:"
+echo "       git clang-format --force # format the changed parts"
+echo "       git clang-format --diff # preview the changes done by the formatter"
+exit 1
diff --git a/kde-modules/kde-git-commit-hooks/pre-commit.in b/kde-modules/kde-git-commit-hooks/pre-commit.in
new file mode 100644
index 00000000..36cdfd5d
--- /dev/null
+++ b/kde-modules/kde-git-commit-hooks/pre-commit.in
@@ -0,0 +1,3 @@
+#!/usr/bin/env bash
+
+${CLANG_FORMAT_SCRIPT}