Add --help to installer

install.zsh

@@ -91,7 +91,7 @@ install_prog() {
 	fi
 }
 
-if [[ -z $1 ]]; then
+usage() {
 	<<-HELP
 	Usage: $0 [opts] <program_names>
 	Options:
@@ -103,10 +103,15 @@ if [[ -z $1 ]]; then
 	  --no-flatpak      do not automatically install flatpak deps (still checks for them)
 	HELP
 	exit 1
-fi
+}
+
+[[ -z $1 ]] && usage
 
 zparseopts -D -E p:=install_path -path:=install_path f=force -force=force \
-	s=skip -skip=skip -no-flatpak=noflatpakinstall a=all -all=all l=list -list=list
+	s=skip -skip=skip -no-flatpak=noflatpakinstall a=all -all=all l=list -list=list -help=help h=help
+
+[[ $help ]] && usage
+
 
 if [[ ! $install_path ]]; then
 	install_path=$HOME/.local/bin