river: Add output quick switch script

Invoked by `MOD+SHIFT+O` (for '[O]utput'), it greps the kanshi
configuration file for existing profiles and allows you to select one
which kanshi tries to apply. Can be a little buggy, though due to kanshi
and not the plugin (sometimes failing to re-activate turned off screens
etc).

desktop/.local/bin/kanshiswitch

@@ -0,0 +1,29 @@
+#!/usr/bin/env sh
+
+if ! exist kanshictl; then
+    printf "Requires command 'kanshictl' on system."
+    exit 1
+fi
+
+picker=dmenu
+if exist bemenu; then
+    picker=bemenu
+elif exist wofi; then
+    picker=wofi
+elif exist rofi; then
+    picker=rofi
+fi
+
+regex='s/profile \+\(.*\) \+{/\1/p'
+
+list=$(sed -ne "$regex" "${XDG_CONFIG_HOME:-~/.config}/kanshi/config")
+profile=$(printf "%s" "$list" | "$picker")
+if [ -z "$profile" ]; then
+    return
+else
+    kanshictl switch "$profile"
+fi
+
+if [ "$1" = '-v' ]; then
+    notify-send "Kanshi profile set" "Set to: $profile"
+fi