toolchecker

#!/usr/bin/env bash

# check bash version up front, I use some pretty modern dumb tricks, apparently
if [ ${BASH_VERSION:0:1} -lt 4 ]; then
    echo "These scripts require bash version 4.0 or newer for arcane nonsense reasons."
    echo "Your bash version (${BASH_VERSION}) is too old."
    echo "If you are running macOS, Apple no longer ships modern bash for license reasons."
    echo "Consider installing a modern bash using Homebrew (https://brew.sh/) or Macports (https://macports.org)"
    exit 1
fi

# Check for tool dependencies

## External tools
[ -z "$TOOLS" ] && TOOLS=(ffmpeg ffprobe mkvpropedit mediainfo jq bc tr sed grep awk)

for tool in ${TOOLS[@]}; do
    [ "$tool" = "NONE" ] && break
    VAR="${tool^^}"
    if [ -z "${!VAR}" ]; then
        declare "$VAR"=`which $tool 2>/dev/null`
        if [ -z "${!VAR}" ]; then
            echo "$tool not found."
            exit 1
        fi
    elif [ ! -x ${!VAR} ]; then
        echo "$tool not executable."
        exit 1
    fi
    [ $DEBUG ] && echo "$VAR: ${!VAR}"
    if [ "$tool" = "ffmpeg" ]; then
        FFMPEG_PREFIX=`$FFMPEG -hide_banner -buildconf 2>&1 | grep prefix | awk -F= '{print $2}'`
        [ $DEBUG ] && echo "FFMPEG_PREFIX: ${FFMPEG_PREFIX}"
    fi
done


## Utility scripts from this toolkit
[ -z "$SCRIPTS" ] && SCRIPTS=(cropfinder stripcovers striptags addstats)
[ -z "$SELF_DIR" ] && SELF_DIR=$(dirname realpath $0)

for script in ${SCRIPTS[@]}; do
    [ "$script" = "NONE" ] && break
    VAR="${script^^}"
    if [ -z "${!VAR}" ]; then
        declare "$VAR"=$(realpath $SELF_DIR/$script 2>/dev/null)
        if [ -z "${!VAR}" ]; then
            echo "$script not found."
            exit 1
        fi
    elif [ ! -x ${!VAR} ]; then
        echo "$script not executable."
        exit 1
    fi
    [ $DEBUG ] && echo "$VAR: ${!VAR}"
done

## Save a copy of the IFS because I abuse it fucking constantly
O_IFS="${IFS}"

## Helpful functions
fail() {
    { set +x; }; 2>/dev/null
    printf '%s\n' "${1}" >&2 ## Send message to stderr.
    exit "${2-1}" ## Return a code specified by $2, or 1 by default.
}

paramsmunge() {
    case ":${PARAMS}:" in
        *:"${1}":*)
            ;;
        *)
            if [ "$2" = "after" ] ; then
                PARAMS=$(echo ${PARAMS}:${1} | sed -e 's/^://g' -e 's/:$//g')
            else
                PARAMS=$(echo ${1}:${PARAMS} | sed -e 's/^://g' -e 's/:$//g')
            fi
    esac
}

PARAMS=

[ $DEBUG ] && echo