ImageMagick to make my avatar

eagle.sh

#!/bin/bash

# ImageMagick script to generate github/bitbucket avatar
# http://www.imagemagick.org/Usage/draw/

out=${HOME}/Documents/eagle.png
side=420
tile=60
marg=30
canvas="#f0f0f0"
fill="#008088"
secret="#cccccc"
stroke="#183c5c" # unused

map="\
011000
021011
111110
011100
001000
011100
"

# handle newline as a variable
n='
'

# initialize the command string and open the draw
cmd="convert -verbose -size ${side}x${side} xc:$canvas "
#cmd+="-stroke '${stroke}' "

x=$[marg]; y=$[marg]
for (( i=0; i<${#map}; i++ )); do
    case ${map:${i}:1} in
    0)
        # unfilled tile increments x but draws no rectangle
        #echo -n \#
        x=$[x+tile]
        ;;
    1)
        # filled tile appends a rectangle in the main color
        #echo -n .
        cmd+="-fill '${fill}' -draw \"rectangle $x,$y $[x+tile],$[y+tile]\" "
        x=$[x+tile]
        ;;
    2)  # secret filled tile appends a rectangle in the secondary color
        #echo -n ,
        cmd+="-fill '${secret}' -draw \"rectangle $x,$y $[x+tile],$[y+tile]\" "
        x=$[x+tile]
        ;;
    $n)
        # newline resets x and increments y
        #echo ~
        x=$[marg]
        y=$[y+tile]
        ;;
    *)
        # unrecognized char
        #echo -n ?
    esac
done

# close the draw and append output dest
cmd+=${out}

# execute the command
#echo $cmd
eval ${cmd}