BASH - create screenshots for cms themes

theme_screenshot.sh

#!/bin/bash
pageres_res="1024x768"
website=$1
shift

while test $# -gt 0
do
  case "$1" in
    --drupal)
      w=294
      h=219
      screenshot_filename="screenshot.png"
      shift
      ;;

    --wordpress)
      w=880
      h=660
      screenshot_filename="screenshot.png"
      shift
      ;;

    *)
      shift
      ;;
  esac
done

if [[ "$w" = "" || "$h" = "" ]]
then
  echo "Please provide a preset (drupal/wordpress). E.g: $0 --drupal"
  exit 1
fi

pageres_output="$website-$pageres_res.png"
# Pageres removes protocol information from the url. So let's do the same.
pageres_output=${pageres_output/http:\/\//}
pageres_output=${pageres_output/https:\/\//}
# Pageres removes "www." from hostnames. So let's do the same.
pageres_output=${pageres_output/www./}
# Pageres converts slashes to "!". So let's do the same.
pageres_output=${pageres_output//\//!}

pageres "$website" --sizes "$pageres_res"

if [ $? -eq 1 ]
then
  echo "Failed to take a screenshot of $website."
  exit 1
fi

convert "$pageres_output" -resize "${w}x" -gravity North -crop "${w}x${h}"+0+0 "$screenshot_filename"

if [ $? -eq 1 ]
then
  echo "Failed to resize the screenshot."
  exit 1
fi

# Remove pageres output.
rm "$pageres_output"

echo "Screenshot done!"