build: add check-controller.sh, a utility to test controller files

The main purpose of the script is to check if the module declaration
matches and if associated cbi resources are properly referenced.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

diff --git a/build/check-controllers.sh b/build/check-controllers.sh
new file mode 100755 (executable)
index 0000000..573e6f8
--- /dev/null
+++ b/build/check-controllers.sh
@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+
+[ -d build ] || {
+       echo "Execute as ./build/check-controllers.sh" >&2
+       exit 1
+}
+
+find . -type f -name '*.lua' -path '*/controller/*' | while read controller; do
+       controller="${controller#./}"
+       base="${controller%%/controller/*}"
+
+       sed -rne 's#^.*\b(cbi|form)\([[:space:]]*("([^"]*)"|\047([^\047]*)\047)[[:space:]]*[,)].*$#\1 \3\4#gp' "$controller" | while read type map; do
+               model="$base/model/cbi/$map.lua"
+               package="${controller##*/controller/}"; package="${package%.lua}"; package="luci.controller.${package//\//.}"
+
+               if ! grep -sqE '\bmodule[[:space:]]*\(?[[:space:]]*("|\047|\[=*\[)'"$package" "$controller"; then
+                       echo "'$controller' does not containt the expected\n\t'module(\"$package\", ...)' line.\n"
+               fi
+
+               grep -sqE '\b(Form|SimpleForm)[[:space:]]*\(' "$model" && ! grep -sqE '\bMap[[:space:]]*\(' "$model" && is_form=1 || is_form=0
+
+               if [ ! -f "$model" ]; then
+                       echo -e "'$controller' references $type('$map')\n\tbut expected file '$model' does not exist.\n"
+               elif [ $type = "cbi" -a $is_form = 1 ]; then
+                       echo -e "'$controller' references $type('$map')\n\tbut '$model' looks like a Form or SimpleForm.\n"
+               elif [ $type = "form" -a $is_form = 0 ]; then
+                       echo -e "'$controller' references $type('$map')\n\tbut '$model' does not look like a Form or SimpleForm.\n"
+               fi
+       done
+done