Use cached-nix-shell for scr{cap,rec} scripts

Also refactor them

bin/scrcap

@@ -1,4 +1,5 @@
-#!/usr/bin/env bash
+#!/usr/bin/env cached-nix-shell
+#! nix-shell -i bash -p maim slop
 
 # A script that takes a screenshot (prompts you for what region/window to
 # capture) and stores it in the clipboard.
@@ -8,7 +9,7 @@ cleanup() { rm -f "$tmp"; }
 trap cleanup EXIT
 
 # Delay for long enough that we can refocus the targeted window
-if maim --delay=${1:-0.6} -us >"$tmp"; then
+if maim --delay=${2:-1} -us >"$tmp"; then
   xclip -selection clipboard -t image/png "$tmp" &&
     notify-send "Screenshot saved"
 else

bin/scrrec

@@ -1,4 +1,5 @@
-#!/usr/bin/env bash
+#!/usr/bin/env cached-nix-shell
+#! nix-shell -i bash -p ffmpeg slop
 
 # Select a region and record it.
 #
@@ -14,26 +15,25 @@ geom=
 delay=1
 count=3
 fps=30
-compton=1
 stopfile=/tmp/_stop
-while getopts spg:d:c: opt; do
+while getopts c:d:f:g:ps opt; do
   case $opt in
-    s) is_script=1 ;;
     c) count=$OPTARG ;;
-    p) compton= ;;
+    d) delay="$OPTARG" ;;
     f) fps=$OPTARG ;;
     g) geom="$OPTARG" ;;
-    d) delay="$OPTARG" ;;
+    p) compton= ;;
+    s) is_script=1 ;;
   esac
 done
 shift $((OPTIND-1))
 
 ##
-select_region() {
+select-region() {
   if [[ $geom ]]; then
     echo "${geom//[x+]/ }"
   else
-    slop -n -f "%x %y %w %h"
+    slop -nof "%w %h %x %y"
   fi
 }
 
@@ -55,11 +55,9 @@ countdown() {
 }
 
 recording-start() {
-  local X Y W H
-  read -r X Y W H < <(select_region)
-  local ffmpeg_opts="-y -f x11grab -show_region 1 -ss $delay -s ${W}x${H} -i :0.0+${X},${Y} -framerate ${fps}"
+  local ffmpeg_opts="-y -f x11grab -show_region 1 -ss $delay -s ${4}x${5} -i :0.0+${2},${3} -framerate ${fps}"
   local dest=${1:-./rec.mp4}
-  local mp4dest
+  local mp4dest=
   [[ $dest == *.gif ]] && mp4dest="${dest%.*}.mp4"
   countdown
   touch $stopfile
@@ -80,14 +78,19 @@ if [[ $is_script && -f $stopfile ]]; then
   exit 0
 fi
 
+read -r W H X Y < <(select-region)
+
 # Compton with blur and/or transparencies cause unbearable flickering in
 # recordings, so temporarily disable it.
+compton=
 if systemctl is-enabled --user compton >/dev/null; then
   systemctl --user stop compton
+  compton=1
 fi
-recording-start "$dest"
-if systemctl is-enabled --user compton >/dev/null; then
-  systemctl --user start compton
-fi
+cleanup() { [[ $compton ]] && systemctl --user start compton; }
+trap cleanup EXIT
+
+# Let 'er rip
+recording-start "$dest" "$X" "$Y" "$W" "$H"
 
 # vim:set ft=sh shiftwidth=2: