fixup! chore: add script to Makefile to check for missing filetypes

Author: hasecilu

scripts/filetypes.sh

@@ -1,6 +1,11 @@
 #!/usr/bin/env bash
 
 # Iterate over the elements of icons_by_file_extension and check if there are missed filetypes.
+# $VIMRUNTIME specifies neovim runtime path, defaults to "/usr/share/nvim/runtime" if unset.
+
+if [ -z "${VIMRUNTIME}" ]; then
+	export VIMRUNTIME="/usr/share/nvim/runtime"
+fi
 
 in_section=false
 
@@ -18,7 +23,7 @@ while IFS= read -r line; do
 		if [ -n "$line" ]; then
 			continue
 		else
-			[ -f "/usr/share/nvim/runtime/syntax/$key.vim" ] &&
+			[ -f "${VIMRUNTIME}/syntax/$key.vim" ] &&
 				echo -e "\e[33mPlease add \"$key\" to filetypes Lua table.\e[0m"
 		fi
 	fi