bash-minifier

#! /usr/bin/env bash

# shellcheck disable=SC1091
. bpm
bpm::include assign
bpm::include strict
. lib/bash-tokenizer

# to profile, unset these two and run. (ps4-python)
# ./bash-minifier SCRIPT 2>&1 | grep '^\+' | ./profile.py
# PS4='+$? (${BASH_SOURCE}:${LINENO}): ${FUNCNAME[0]:+${FUNCNAME[0]}(): } $BASH_COMMAND\n -> '
# set -x

# Yet another method (debug trap) with only Bash 5
# PROFILE=true ./bash-minifier SCRIPT 2>&1 | ./profile-bash-5
if [[ -n "$PROFILE" ]]; then
    set -o functrace

    if [[ -n "$EPOCHREALTIME" ]]; then
        trap 'echo "+$? $EPOCHREALTIME (${BASH_SOURCE}:${LINENO}): ${FUNCNAME[0]:+${FUNCNAME[0]}(): } $BASH_COMMAND" >&2' DEBUG
    elif [[ "$(date +%N)" == N ]]; then
        # BSD version of date
        trap 'echo "+$? $(python -c '"'"'from time import time; print "%.9f" % time();'"'"') (${BASH_SOURCE}:${LINENO}): ${FUNCNAME[0]:+${FUNCNAME[0]}(): } $BASH_COMMAND" >&2' DEBUG
    else
        # GNU version of date
        trap 'echo "+$? $(date +%s.%N) (${BASH_SOURCE}:${LINENO}): ${FUNCNAME[0]:+${FUNCNAME[0]}(): } $BASH_COMMAND" >&2' DEBUG
    fi
fi

bash-minifier::help() {
    cat <<'EOF'
Bash Minifier

Parses a shell script and writes a minified version to stdout.

Usage:

    bash-minifier INPUT_FILE > OUTPUT_FILE
EOF
}

bash-minifier::load() {
    local content=()

    while IFS=$'\n' read -r line; do
        content[${#content[@]}]=$line
    done < <(cat -- "$2")

    local "$1" && assign::array "$1" "${content[@]}"
}

bash-minifier() {
    local content filename

    strict::mode
    filename=${1-}

    if [[ ! -f "$filename" ]] && [[ "$filename" != "-" ]]; then
        filename=
    fi

    if [[ -z "$filename" ]]; then
        bash-minifier::help

        exit 1
    fi

    content=$(cat -- "$filename"; echo x)
    content=${content%x}
    bash-tokenizer::tokenize content "$content"
}

if ! bpm::isSourced; then
    bash-minifier ${@+"$@"}
fi