oshu-launcher/oshu-launcher

#!/bin/bash

# Copyright 2022 Tom MTT <tom@heimdall.pm>
# This file is licensed under the 3-Clause BSD License.
# Please see 'oshu-launcher version' for more information.

# Shell options
set -euo pipefail

# Debug Mode
[ "${DEBUG+x}" ] && set -x

# Constants
PROGRAM="$(basename "$0")"
PADDING="$(printf "%-${#PROGRAM}s")"
VERSION="0.1.0"
AUTHORS="Tom MTT <tom@heimdall.pm>"
PREFIX="$HOME/.osu"

# Misc
CLEAR="\033[0m"
RED="\033[31m"
BLUE="\033[34m"

ERROR="${RED}Error${CLEAR}"
PS3="> "

die() {
    echo -e "$PROGRAM: $ERROR: $1" >&2
    shift

    for text in "$@"
    do
        echo -e "$PADDING  $text" >&2
    done

    exit 1
}

# Check dependencies and stuff
check_deps() {
    type oshu > /dev/null 2>&1 || die "'oshu' not found." "Make sure it is installed and in your \$PATH."
    type tree > /dev/null 2>&1 || die "'tree' not found." "Make sure it is installed and in your \$PATH."
}

# Display help page
cmd_help() {
cat <<EOF
oshu-launcher - a small menu for oshu

Usage: $PROGRAM [help|version|play|list]
Commands:
  help          display this help
  version       display software version and license
  play          play oshu
  list          list available beatmaps and variants

EOF
}

# Display software version and license
cmd_version() {
cat <<EOF
oshu-launcher - a small menu for oshu
              - version $VERSION by $AUTHORS

Copyright 2022 Tom MTT <tom@heimdall.pm>

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

EOF
}

# Play a beatmap
cmd_play() {
    while true
    do
        clear
        cd "$PREFIX"

        echo -e "${BLUE}Which beatmap?${CLEAR}"
        select beatmap in *
        do
            [[ "$REPLY" = "q" ]] && exit
            [[ -z "$beatmap" ]]  && continue

            clear
            cd "$beatmap"

            variants=()

            for file in *.osu
            do
                variants+=("$(basename "$file" .osu)")
            done

            echo -e "${BLUE}Which variant?${CLEAR}"
            select variant in "${variants[@]}"
            do
                [[ "$REPLY" = "q" ]] && exit
                [[ -z "$variant" ]]  && continue

                oshu --pause "$variant.osu"
                break
            done

            break
        done
    done
}

# List every beatmap and variants
cmd_list() {
    tree -NCl --prune --noreport -P "*.osu" * | sed -E 's/\.osu(\x1B\[[0-9]+m)?( ->|$)/\1\2/g'
}

# Main function
main() {
    # Change root folder
    cd "$PREFIX"

    # Convert long flags to short ones
    for arg in "$@"; do
        shift
        case "$arg" in
            "--help")    set -- "$@" "-h"   ;;
            "--version") set -- "$@" "-V"   ;;
            *)           set -- "$@" "$arg" ;;
        esac
    done

    argument="${1-}"

    # Parse arguments
    case "$argument" in
        "")   cmd_play    ;;
        "-h") cmd_help    ;;
        "-V") cmd_version ;;
        "-"*)
            die "'$argument' is not a known parameter." \
                "Run '$PROGRAM help' for a list of known parameters."
        ;;
        *)
            shift

            if type "cmd_$argument" > /dev/null 2>&1
            then
                "cmd_$argument" "$@"
            else
                die "'$argument' is not a known subcommand." \
                    "Run '$PROGRAM help' for a list of known subcommands."
            fi
        ;;
    esac
}

check_deps
main "$@"