#!/usr/bin/env nix-shell
#! nix-shell -i bash -p ffmpeg slop

# Select a region and record it.
#
# If given a gif, it will record an mp4 and convert it afterwards using the
# mov2gif script included in this repo (which is powered by gifsicle and
# ffmpeg).
#
# Usage: scrrec somefile.mp4
#        scrrec another.gif

is_script=
geom=
delay=1
while getopts sg:d: opt; do
  case $opt in
    s) is_script=1 ;;
    g) geom="$OPTARG" ;;
    d) delay="$OPTARG" ;;
  esac
done
shift $((OPTIND-1))


if [[ -f /tmp/_stop ]]; then
  echo q > /tmp/_stop
  if [[ $is_script ]]; then
    >&2 echo "Nope"
  else
    echo "Stopped previous recording"
  fi
  exit 0
fi

if [[ $geom ]]; then
  read -r W H X Y <<<"${geom//[x+]/ }"
else
  read -r X Y W H < <(slop -n -f "%x %y %w %h")
fi
dest=${1:-./rec.mp4}
if [[ $dest == *.gif ]]; then
  echo "Detected gif"
  mp4dest="${dest%.*}.mp4"
fi

if [[ $is_script ]]; then
  echo "Starting"
  touch /tmp/_stop
  ffmpeg -y -f x11grab -ss $delay -s "$W"x"$H" -i :0.0+$X,$Y -framerate 30 "${mp4dest:-$dest}" </tmp/_stop
  rm -f /tmp/_stop
else
  ffmpeg -y -f x11grab -ss $delay -s "$W"x"$H" -i :0.0+$X,$Y -framerate 30 "${mp4dest:-$dest}"
fi

if [[ -f $mp4dest ]]; then
  mov2gif "$mp4dest" "$dest" && rm -fv "$mp4dest"
fi

echo "Finishing up"

# vim:set ft=sh shiftwidth=2: