From 90e2cc7eff35424fd45e1edf8a155c5ed338d45f Mon Sep 17 00:00:00 2001
From: Luca Weiss <luca@z3ntu.xyz>
Date: Tue, 25 Jun 2019 08:49:34 +0200
Subject: [PATCH] CI: check coding style of C code (!465)

---
 .gitlab-ci.yml                    |  9 +++++++++
 .gitlab-ci/static_clang-format.sh | 22 ++++++++++++++++++++++
 2 files changed, 31 insertions(+)
 create mode 100755 .gitlab-ci/static_clang-format.sh

diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 4e712bca6..23103de1e 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -42,6 +42,15 @@ py-sh-static:
   script:
     - .gitlab-ci/static_code_analysis.sh
 
+# coding style check
+clang-format-static:
+  stage: first
+  <<: *only-default
+  before_script:
+    - apk -q add clang git
+  script:
+    - .gitlab-ci/static_clang-format.sh
+
 # aports checks (generic)
 aports-static:
   stage: first
diff --git a/.gitlab-ci/static_clang-format.sh b/.gitlab-ci/static_clang-format.sh
new file mode 100755
index 000000000..2c0017e37
--- /dev/null
+++ b/.gitlab-ci/static_clang-format.sh
@@ -0,0 +1,22 @@
+#!/bin/sh
+
+set -e
+
+clang-format -i $(find . -name "*.c")
+
+git diff > differences.patch
+
+if [ -s differences.patch ]; then
+    echo "C-Code formatting check failed!"
+    echo "Please make sure, the code is formatted properly!"
+    echo "Run:"
+    echo '    clang-format -i $(find . -name "*.c")'
+    echo
+    cat differences.patch
+    echo
+    rm differences.patch
+    exit 1
+else
+    echo "C-Code formatting check is sucessful!"
+    exit 0
+fi