tools: restructured

.local/bin/etc/sxiv/ifinstalled

@@ -0,0 +1,6 @@
+#!/bin/sh
+
+# If $1 command is not available, error code and notify.
+# by lukesmithxyz, checkout github.com/lukesmithxyz/voidrice
+
+command -v "$1" >/dev/null || { notify-send "📦 $1" "must be installed for this function." && exit 1 ;}