byzanz-window

#!/bin/bash

# Record a gif with byzanz.
# Prompts for window or screen region
# Stops with ctrl+c

IMAGE="$HOME/Desktop/screencast-$(date +'%F.%T').gif"

function window_dimensions() {
  info="$(xwininfo)"
  x=$(echo "$info" | grep 'Absolute upper-left X' | cut -f 7 -d' ')
  y=$(echo "$info" | grep 'Absolute upper-left Y' | cut -f 7 -d' ')
  w=$(echo "$info" | grep Width | cut -f 4 -d' ')
  h=$(echo "$info" | grep Height | cut -f 4 -d' ')

  echo "-x $x -w $w -y $y -h $h"
}

function spinner() {
  spinner=(/ - \\ \| / - \\ \| )
  pos=0
  while :
  do
    printf "\b"${spinner[$pos]}
    (( pos=(pos + 1)%8 ))
    sleep 0.2
  done
}
export -f spinner

function open_image() {
  if [ -s $IMAGE ]
  then
    xdg-open $IMAGE
  fi
  exit
}
trap open_image INT


if ! which byzanz-record > /dev/null 2>&1;
then
  echo "byzanz not found, please install first."
  exit
fi

echo "Choose the window to record"
DIMS=$(window_dimensions)

echo "Recording window... ctrl+c to stop!"
byzanz-record $DIMS "$IMAGE" --exec "bash -c spinner"