convert script(1) recordings to gif

typescripttogif

#!/bin/bash

# Changelog
# ---------
#
# origin from https://gist.github.com/tg123/6240128
# modified by marek-saji:
# - use single loop
# - skip frames delayed by 0
# - loop animation with additional delay after every loop
# - use xwd(1) for much faster screen capturing
# - cleanup on non-successful exit
# - open gif, when ready
# - launch gnome-terminal(1) if $WINDOWID is empty
#
# origin from http://blog.fedora-fr.org/metal3d/post/typescript-to-gif
# modified by tgic to specified output file

# exit on first error
set -e

if [ -z "$WINDOWID" ]
then
    test -z "$COLUMNS" && COLUMNS=$( tput cols  2>/dev/null )
    test -z "$LINES"   && LINES=$(   tput lines 2>/dev/null )
    exec gnome-terminal \
        --geometry="${COLUMNS}x${LINES}" \
        --working-directory="$PWD" \
        --command="$0 $*"
fi

# cleanup on non-successful exit
trap 'test -d $WORKDIR && rm -rf $WORKDIR' INT TERM QUIT EXIT

# http://www.imagemagick.org/script/command-line-options.php#limit
CONVERTARG="-monitor -limit memory 32MiB -limit map 64MiB"

PAUSEBETWEENLOOPS=500

TIMING=$1
SCRIPT=$2
OUTPUT=$3

if [ ! -f "$TIMING" ] || [ ! -f "$SCRIPT" ] || [ "$OUTPUT" == "" ]
then
    echo "usage: $0 TIMING SCRIPT OUTPUT"
    exit
fi

WORKDIR=$(mktemp -d typescript-to-gif.XXXXXXXXXX)

WORKSCRIPT=$WORKDIR/typescript
cp $SCRIPT $WORKSCRIPT

#remove first line
sed -i '1d' $WORKSCRIPT

#clear screen
clear
sleep 1

curr=0
i=0
frames=
while read timing chars
do
    timing=$( echo "$timing" | awk -F. '{ print $1 substr($2, 1, 2) }' )

    dd if=$WORKSCRIPT bs=1 skip=$curr count=$chars 2>/dev/null

    if [ "0" != "$timing" ]
    then
        #convert to gif frame with a nice frame-number
        file=$WORKDIR/$i.xwd
        xwd -id $WINDOWID > $file
        frames=$frames" -delay $timing $file"
    fi


    #and move to next position
    curr=$(( curr+chars ))
    i=$(( i+1 ))
done < $TIMING
frames=$frames" -delay $PAUSEBETWEENLOOPS $file"

echo
echo 'Create gif file...'
convert $CONVERTARG $frames -loop 0 -coalesce -layers Optimize $OUTPUT

OPENER="$(
    which xdg-open 2>/dev/null || # Linux
    which open 2>/dev/null ||     # MacOSX
    echo printf "gif is ready: %s\n"
)"
nohup $OPENER $OUTPUT >/dev/null 2>&1 &