#!/bin/sh

INPUT_DIR=blog
OUTPUT_DIR=dist

usage () {
    printf "%s\n" "Usage: shblg [-i input_dir] [-o output_dir]"
    exit 1
}

while getopts ":o:i:h" opt; do
    case "$opt" in
        o)
            OUTPUT_DIR="$OPTARG/"
            mkdir -p "$OUTPUT_DIR"
            OUTPUT_DIR="$(realpath "$OUTPUT_DIR")"
            ;;
        i)
            INPUT_DIR="$(realpath "$OPTARG")"
            ;;
        *) usage
            ;;
    esac
done

# process a file to 
process () {
    path="${1#"$INPUT_DIR"}"
    dirpath="${1%"${1##*/}"}"
    out_file="${OUTPUT_DIR}${path}"

    printf "%s ...\n" "$path"

    [ -d "$1" ] && {
        mkdir -p "$out_file"
        for f in "$1"/*; do
            process "$f"
        done
        return 0
    } || [ -x "$1" ] && (
        # execute the file
        cd "$dirpath"
        "$1" > "${out_file}"
        return 0
    ) || {
        # just copy the file as is
        cp "$1" "$out_file"
        return 0
    }
}

process "$INPUT_DIR"