--- /dev/null
+#include <string.h>
+#include <stdbool.h>
+
+/*
+ * Returns true if this version of i3 is a debug build (anything which is not a
+ * release version), based on the git version number.
+ *
+ */
+bool is_debug_build() {
+ /* i3_version contains either something like this:
+ * "4.0.2 (2011-11-11, branch "release")".
+ * or: "4.0.2-123-gCOFFEEBABE (2011-11-11, branch "next")".
+ *
+ * So we check for the offset of the first opening round bracket to
+ * determine whether this is a git version or a release version. */
+ return ((strchr(I3_VERSION, '(') - I3_VERSION) > 10);
+}