ghr-compress

#!/usr/bin/env bash
set -e -u -o pipefail
shopt -s nullglob

if [ "$GHR_COMPRESS" = "gz" ]; then
    tar_option=z
    extension=".tar.gz"
elif [ "$GHR_COMPRESS" = "bz2" ]; then
    tar_option=j
    extension=".tar.bz2"
elif [ "$GHR_COMPRESS" = "xz" ]; then
    tar_option=J
    extension=".tar.xz"
elif [ "$GHR_COMPRESS" = "zip" ]; then
    extension=".zip"
else
    echo "ghr-compress: error: unknown extension: ${extension}" >&2
    exit 1
fi

ghr-compress-one-tar() {
    local file="$1"
    tar c "-${tar_option}" -f "${file}${extension}" "$file"
}

ghr-compress-one-zip() {
    local file="$1"
    zip -r "${file}${extension}" "$file"
}

ghr-compress-one() {
    local file="$1"
    local file_extension=".${file#*.}"  # get extension from the file
    if [ "$file_extension" != "$extension" ]; then # only compress if the extensions dont match to avoid recompressing
      if [ "$GHR_COMPRESS" = "zip" ]; then
          ghr-compress-one-zip "$file" >&2
      else
          ghr-compress-one-tar "$file"
      fi
      rm -r -- "$file"
    fi
}

if [ "$GHR_PATH" = "." ]; then
    for file in *; do
        ghr-compress-one "$file"
    done
else
    ghr-compress-one "$GHR_PATH"
    echo "export GHR_PATH=$(printf '%q' "${GHR_PATH}${extension}")"
fi