build-scripts/compress-images.sh

   1 #!/usr/bin/env bash
   2
   3 set -euo pipefail
   4 IFS=$'\n\t'
   5
   6 SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
   7
   8 compress_dir() {
   9   shopt -s nullglob
  10   local dir_name=$1
  11   pushd . > /dev/null
  12   cd ${dir_name}
  13   pwd
  14
  15   for i in *.png; do
  16     local input=${i}
  17     local output=$(mktemp)
  18     local starts_with_dash=0
  19     local tmp_file_name=""
  20
  21     # zopfli freaks out for things that start with a dash, so we need to
  22     # copy them first
  23     if [[ ${input} = -* ]]; then
  24       starts_with_dash=1
  25       tmp_file_name=$(mktemp)
  26       cp -- ${input} ${tmp_file_name}
  27       input=${tmp_file_name}
  28     fi
  29
  30     zopflipng -m --iterations=15 --filters=0meb ${input} ${output}
  31     if [[ -f ${output} ]]; then
  32       mv -- "${output}" "${i}"
  33     fi
  34
  35     if [[ -n ${tmp_file_name} ]]; then
  36       rm -f ${tmp_file_name};
  37     fi
  38
  39     rm -f ${output}
  40   done
  41
  42   popd
  43 }
  44
  45
  46 if [[ -n ${1} ]]; then
  47   compress_dir ${1}
  48   exit
  49 fi
  50
  51 for i in $(find "${SCRIPT_DIR}/../public" -name '*.png' -exec dirname {} \;|sort -ur); do
  52   compress_dir ${i}
  53 done