82 lines
2.4 KiB
Bash
Executable file
82 lines
2.4 KiB
Bash
Executable file
#!/usr/bin/env bash
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set -e;
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###
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## Input handling
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###
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# Set flags for calling oxipng later
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if [[ -n "${UNSAFE}" ]]; then FLAGS="${FLAGS} -a"; fi
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if [[ -z "${1}" ]]; then
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echo "Wrapper for oxipng for handling OpenRaster files
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Usage:
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oxiora file_a.ora file_b.ora ... file_n.ora
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Environment variables:
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UNSAFE
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Set to any value to send the -a flag to oxipng, which allows altering the colour of completely transparent pixels. Alters the content of images, so disabled by default.
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FLAGS
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Any additional flags to pass to oxipng.
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";
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exit 0;
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fi
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###
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## Preamble
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###
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# Create temporary directory and clean it up afterwards no matter what
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temp_dir="$(mktemp --tmpdir -d "oxiora-XXXXXXX")";
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on_exit() {
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rm -rf "${temp_dir}";
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}
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trap on_exit EXIT;
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###
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## Main loop
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###
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# We process serially here, because oxipng does a good job of using all available CPU cores already
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for filepath in "$@"; do
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echo ">>> Processing ${filepath}";
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filesize_before="$(wc -c <"${filepath}")";
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unzip "${filepath}" -d "${temp_dir}";
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chmod u+w -R "${temp_dir}"
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# no -a here 'cause this is technically an editing file to fully-transparent pixel colours could have meaning
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#shellcheck disable=SC2086
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find "${temp_dir}" -iname '*.png' -print0 | xargs -0 oxipng ${FLAGS} -omax;
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filepath_target="${filepath%.*}-small.${filepath##*.}";
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filepath_target="$(realpath "${filepath_target}")";
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# The OpenRaster spec says the mimetype file has to be uncompressed
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# Ref https://www.openraster.org/baseline/file-layout-spec.html#mimetype
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# unzip style ref https://askubuntu.com/a/1399484/139735
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(cd "${temp_dir}" && find . -type f -name 'mimetype' | zip -0 -r "${filepath_target}" --names-stdin)
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(cd "${temp_dir}" && find . -type f -not -name 'mimetype' | zip -9 -r "${filepath_target}" --names-stdin)
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# Only write the .ora back if it is smaller than the original
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filesize_after="$(wc -c <"${filepath_target}")";
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difference="$((filesize_before-filesize_after))";
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echo ">>> BEFORE $(echo "${filesize_before}" | numfmt --to=iec)iB";
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echo ">>> AFTER $(echo "${filesize_after}" | numfmt --to=iec)iB";
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if [[ "${filesize_after}" -lt "${filesize_before}" ]]; then
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echo ">>> Compressed by $(echo "${difference}" | numfmt --to=iec)iB";
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mv -f "${filepath_target}" "${filepath}";
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else
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echo ">>> Compressed file was $(echo "$((-difference))" | numfmt --to=iec)iB larger, discarding";
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rm "${filepath_target}";
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fi
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find "${temp_dir}" -mindepth 1 -delete
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done
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