compress-dist.sh

#!/bin/bash

DIR="$(cd "$(dirname "$0")" && pwd -P)"
DIST_DIR=${DIR}/dist

BROTLI=$(command -v brotli)
ZOPFLI=$(command -v zopfli)

GZIP=$(command -v pigz)
[ ! -x "$GZIP" ] && GZIP=$(command -v gzip)
[ ! -x "$GZIP" ] && echo "no 'pigz'/'gzip' found" && exit 1
TOUCH=$(command -v touch)
[ ! -x "$TOUCH" ] && echo "no 'touch' found" && exit 1
WC=$(command -v wc)
[ ! -x "$WC" ] && echo "no 'wc' found" && exit 1

find "$DIST_DIR" -type f -print0 | while IFS= read -r -d $'\0' file; do
    ext="${file##*.}"
    case $ext in
        html|js|css|map|svg|ttf|eot|json|ico|webapp)
            if [ "$($WC -c < "$file")" -gt 512 ]; then
                if [ -x "$BROTLI" ]; then
                    outfile="${file}.br"
                    (
                        (
                            # increment "$outfile start" &&
                            $BROTLI -c "$file" > "$outfile" &&
                            $TOUCH -r "$file" "$outfile"
                        ) # && decrement "$outfile done"
                    ) &
                fi

                if [ -x "$ZOPFLI" ]; then
                    outfile="${file}.gz"
                    (
                        (
                            # increment "$outfile start" &&
                            $ZOPFLI -c "$file" > "$outfile" &&
                            $TOUCH -r "$file" "$outfile"
                        ) # && decrement "$outfile done"
                    ) &
                else
                    echo "${file}.gz"
                    $GZIP -9 -c "$file" > "${file}.gz"
                    $TOUCH -r "$file" "${file}.gz"
                fi
            fi
            ;;
    esac
done