Paint16b: A 16 byte paint program written in 12 lines

  #!/bin/bash
  #
  #  Author: Martin "BruXy" Bruchanov, bruxy at regnet.cz
  #
  
  # Check input first
  if [ ! $# -eq 1 ] || [ "$1" == "-h"] || [ "$1" == "--help" ] ; then
  	printf "Usage:\n"	
  	printf "\t$0 saved_image\n"
  	printf "\n\tImage data will be saved into given filename, if file exist\n"
  	printf "\tit will be displayed and ready to edit!\n"
      printf "\tHit  any time to quit the program.\n"
  	exit 1
  fi
  
  ##################
  # Initialization #
  ##################
  
  IMAGE_FILE=$1
  _STTY=$(stty -g)    # Save current terminal setup
  printf   "\e[2J"    # clear screen, set cursos at beginning
  stty -echo -icanon  # Turn off line buffering
  printf "\e[?9h"     # Enable terminal mouse reading
  printf "\e[?25l"    # Turn of cursor 
  printf "\e]0;-=[ ShPaint ]=-\007"
  
  # Hash array with image data,
  # ... key is "$Y;$X",
  # ... value ANSI colors and brush "b;F;Bm"
  declare -A IMAGE  
  
  # Defaults
  BRUSHES=(       )
  FG=( {30..37} )
  BG=( {40..47} ) # 49 ... default background
  X=0 
  Y=0
  ERASE=0
  BRUSH=${BRUSHES[3]}
  FG_COLOR="1;${FG[7]}"
  BG_COLOR=49
  
  #############
  # Functions #
  #############
  
  function save_image() {
  	printf "\e[2J" > $IMAGE_FILE
  	for i in ${!IMAGE[@]}
  	do
  		printf "\e[${i}f\e[${IMAGE[$i]}\e[0m"
  	done >> $IMAGE_FILE
  	# set cursor under the image
  	printf "\e[$(tput lines);1f" >> $IMAGE_FILE
  }
  
  function at_exit() {
  	printf "\e[?9l"          # Turn off mouse reading
  	printf "\e[?12l\e[?25h"  # Turn on cursor
  	stty "$_STTY"            # reinitialize terminal settings
  	clear
  	echo "Thank for using ansipaint!"
  	if [ ! -z "$IMAGE_FILE" ] ; then 
  		echo "Your image is saved as '$IMAGE_FILE'."
  		save_image
  	fi
  	exit
  }
  
  # X = $1, Y = $2
  function set_pos() {
   	echo -en  "\e[$2;$1f"
  }
  
  function show_pos() {
  	set_pos 65 1
  	printf "x,y = %3d,%3d" $X $Y
  }
  
  function show_brush() {
  	set_pos 70 2 
  	printf "[ \e[${FG_COLOR};${BG_COLOR}m$BRUSH\e[0m ]"
  }
  
  function process_click() {
  #	X=$1 Y=$2
  	# set foreground color
  	if [ $Y -eq 1 ] || [ $Y -eq 2 ] ; then
  		if [ $X -gt 2 ] && [ $X -lt 28 ] ; then
  			FG_COLOR="$[Y-1];${FG[$[(X-4)/3]]}"
  			ERASE=0
  		fi
  	fi
  	
  	# set background color
  	if [ $Y -eq 1 ] && [ $X -gt 34 ] ; then
  		if [ $X -gt 34 ] && [ $X -lt 59 ] ; then
  			BG_COLOR="${BG[$[X-35]/3]}"
  			ERASE=0
  		else
  			BG_COLOR="49"
  			ERASE=0
  		fi
  	fi	
  
  	# set brush
  	if [ $Y -eq 2 ] && [ $X -gt 36 ] && [ $X -le 51 ] ; then
  		BRUSH=${BRUSHES[$[(X-37)/2]]}
  		ERASE=0
  	fi
  
  	# set erase
  	if [ $Y -eq 2 ] && [ $X -ge 54 ] && [ $X -le 62 ] ; then
  		BRUSH=" "
  		BG_COLOR="49"
  		ERASE=1
  	fi
  
  	# DEBUG
  	# set_pos 0 25
  	# printf "$FG_COLOR $BG_COLOR $BRUSH"
  }
  
  function draw_menu() {
  	set_pos 1 1; echo "FG: "
  	for i in ${FG[*]}
  	do
  		set_pos $[(i-30)*3+4] 1
  		echo -en "\e[${i}m\e[0m"	
  		set_pos $[(i-30)*3+4] 2
  		echo -en "\e[1;${i}m\e[0m"	
  	done
  
  	set_pos 30 1; echo "BG: "
  	for i in ${BG[*]}
  	do 
  		set_pos $[(i-40)*3+35] 1
  		echo -en "\e[${i}m   \e[0m"	
  	done
  	echo "   |" # default background (49)
  
  	set_pos 30 2; echo -en "Brush: ${BRUSHES[*]}"
  	printf "  [ Erase ]"
  	show_brush
  }
  
  function load_image() {
  	if [ -f $IMAGE_FILE ] ; then 
  		data=$(sed -e 's/\x1b/E/g;s/E\[0m/\n/g;s/E\[2J//' $IMAGE_FILE | \
  			sed -n -e 's/E\[\(.*\)fE\[\(.*m.\)/IMAGE["\1"]="\2"/ p')
  		eval $data
  		cat