Get list of gravatar images for github contributors

images.sh

#!/bin/bash
# Usage ./images.sh optional-start-sha optional-end-sha
# ./images.sh eaa1d00b24008f590b95ad099241b4003688cdda HEAD
if [ $1 ]; then
  start="$1.."
else
  start=""
fi

if [ $2 ]; then
  end="$2"
else
  end="HEAD"
fi

emails=(`git log --format='%ae' $start$end | sort -u`)

count=0
while [ "x${emails[count]}" != "x" ]
do
  email=${emails[$count]}

  email=$email | tr -d ' ' | tr '[:upper:]' '[:lower:]'
  output=($(md5 -s "$email"));
  output=${output[3]}

  echo "<img src=\"http://gravatar.com/avatar/$output\">"
  count=$(( $count + 1 ))
done