Initial checkin of Pika from heckimp

.gitlab/run_style_check_diff.sh

@@ -0,0 +1,30 @@
+#!/bin/bash
+
+set -e
+
+ancestor_horizon=28  # days (4 weeks)
+
+echo ""
+echo "This script may be wrong. You may disregard it if it conflicts with"
+echo "https://gitlab.gnome.org/GNOME/pika/-/blob/master/CODING_STYLE.md"
+
+clang-format --version
+
+# Wrap everything in a subshell so we can propagate the exit status.
+(
+
+source .gitlab/search-common-ancestor.sh
+
+git diff -U0 --no-color "${newest_common_ancestor_sha}" | clang-format-diff -p1 > format-diff.log
+)
+exit_status=$?
+
+[ ${exit_status} == 0 ] || exit ${exit_status}
+
+format_diff="$(<format-diff.log)"
+
+if [ -n "${format_diff}" ]; then
+    cat format-diff.log
+    exit 1
+fi
+