update dist helpers

[chrome-ext/clearhistory-advance-fork.git] / dist / pngcrush.sh

#!/bin/bash -xe
# Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

size()
{
  stat -c %s "$@"
}

do_apngopt()
{
  local png new

  for png in "$@"; do
    new="${png}.new"
    apngopt "${png}" "${new}"
    if [[ $(size "${png}") -gt $(size "${new}") ]]; then
      mv "${new}" "${png}"
    else
      rm "${new}"
    fi
  done
}

do_pngcrush()
{
  local png new

  pngcrush -e .png.new "$@"
  for png in "$@"; do
    new="${png}.new"
    mv "${new}" "${png}"
  done
}

main()
{
  if [ $# -eq 0 ]; then
    set -- $(find -name '*.png')
  fi

  if type -P apngopt >/dev/null; then
    # apngopt likes to corrupt images.
    : do_apngopt "$@"
  elif type -P pngcrush >/dev/null; then
    do_pngcrush "$@"
  else
    echo "error: could not find apngopt or pngcrush"
    exit 1
  fi
}
main "$@"