screenshot: replace xwd+netpbm with maim

While at it, add a new keybind for it.

bin/screenshot.sh

@@ -1,6 +1,6 @@
 #!/bin/sh
 # screenshot
-# Written in 2019-2020 by Lucas
+# Written in 2019-2020,2022 by Lucas
 # CC0 1.0 Universal/Public domain - No rights reserved
 #
 # To the extent possible under law, the author(s) have dedicated all
@@ -12,40 +12,9 @@
 
 usage()
 {
-	cat - <<. >&2
-Usage:
-	${0##*/}
-	${0##*/} -id id
-	${0##*/} -name name
-	${0##*/} -window
-.
+	printf "Usage: %s [maim options]\n" "${0##*/}" >&2
 	exit 1
 }
 
-err()
-{
-	printf "%s: %s\n" "${0##*/}" "$*" >&2
-	exit 1
-}
-
-case $# in
-0)
-	set -- -root
-	;;
-1)
-	[ "$1" = "-window" ] || err "unknown option $1"
-	set --
-	;;
-2)
-	[ "$1" = "-id" ] || [ "$1" = "-name" ] || err "unknown option $1"
-	[ -n "$2" ] || err "$1 expects a non-empty parameter"
-	;;
-*)
-	usage
-	;;
-esac
-
 : ${SCREENSHOTS:=~/media/ss}
-xwd -silent "$@" |
-    xwdtopnm |
-    pnmtopng >"$SCREENSHOTS/$(date +%Y%m%d-%H%M%S).png"
+maim "$@" "$SCREENSHOTS/$(date +%Y%m%d-%H%M%S).png"

xdg-config-dir/herbstluftwm/autostart

@@ -42,6 +42,7 @@ hc keybind $Mod-Control-Return	spawn xterm -geometry 80x40
 hc keybind $Mod-Control-l	spawn xlock
 hc keybind $Mod-Control-z	spawn sh -c 'xlock & doas /usr/sbin/ZZZ'
 hc keybind $Mod-Print		spawn screenshot
+hc keybind $Mod-Shift-Print	spawn screenshot -s
 
 # basic movement
 # focusing clients