pre bulk changes

tools/add-copyright-header

@@ -0,0 +1,32 @@
+#!/bin/sh
+
+HEADER=$(cat <<EOF
+/* Copyright (C) vx-clutch
+ * 
+ * This file is part of yait
+ *
+ * This project and file is licenced under the BSD-3-Clause licence.
+ * <https://opensource.org/licence/bsd-3-clause>
+ */
+EOF
+)
+
+len=${#}
+
+i=0
+for file in "$@"
+do
+
+i=$((i + 1))
+printf 'Adding header [%d/%d] %s\n' $i $len $file
+
+if grep -qF "$HEADER" "$file"; then
+    continue
+fi
+
+tmp=$(mktemp)
+printf '%s\n\n' "$HEADER" > "$tmp"
+cat $file >> "$tmp"
+mv "$tmp" $file
+
+done