263 lines
6.7 KiB
Bash
Executable File
263 lines
6.7 KiB
Bash
Executable File
#!/bin/sh
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#
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# Purpose {{{
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# This script will try to control MPD with mpc client command
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# 1. Start MPD if not already running and disable random mode.
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# 2. Send user command to MPD running instance.
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#
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# 2022-05-22
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# }}}
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# Vars {{{
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PROGNAME=$(basename "${0}")
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readonly PROGNAME
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PROGDIR=$(readlink -m $(dirname "${0}"))
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readonly PROGDIR
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ARGS="${*}"
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readonly ARGS
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readonly NBARGS="${#}"
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[ -z "${DEBUG}" ] && DEBUG=1
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## Export DEBUG for sub-script
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export DEBUG
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## Default values for some vars
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readonly MPD_PROC_REGEXP="mpd.*systemd"
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readonly USER_MULTIMEDIA_COMMAND_DEFAULT="toggle"
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## Colors
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readonly PURPLE='\033[1;35m'
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readonly RED='\033[0;31m'
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readonly RESET='\033[0m'
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readonly COLOR_DEBUG="${PURPLE}"
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# }}}
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usage() { # {{{
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cat <<- HELP
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usage: $PROGNAME [-c|-d|-h]
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Manage MPD with commands.
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EXAMPLES :
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- Starts playing next song on the queue
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${PROGNAME} --command next
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- Send default command (${USER_MULTIMEDIA_COMMAND_DEFAULT}) to MPD
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${PROGNAME}
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- Start MPD if not already running and starts playing
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${PROGNAME}
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OPTIONS :
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-c,--command
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Send a command to running MPD. Available commands :
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* toggle, play, pause
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* next
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* previous
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* random
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* party, partymode, randomparty
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-d,--debug
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Enable debug messages.
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-h,--help
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Print this help message.
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HELP
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}
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# }}}
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debug_message() { # {{{
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local_debug_message="${1}"
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## Print message if DEBUG is enable (=0)
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[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6b\e[m\n' "DEBUG − ${PROGNAME} : ${local_debug_message}"
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unset local_debug_message
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return 0
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}
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# }}}
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error_message() { # {{{
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local_error_message="${1}"
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local_error_code="${2}"
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## Print message
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printf '%b\n' "ERROR − ${PROGNAME} : ${RED}${local_error_message}${RESET}"
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exit "${local_error_code:=66}"
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}
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# }}}
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define_vars() { # {{{
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## If USER_MULTIMEDIA_COMMAND wasn't defined (argument) {{{
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if [ -z "${USER_MULTIMEDIA_COMMAND}" ]; then
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## Use default value
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readonly USER_MULTIMEDIA_COMMAND="${USER_MULTIMEDIA_COMMAND_DEFAULT}"
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fi
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## }}}
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## Translate user command to MPD command {{{
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case "${USER_MULTIMEDIA_COMMAND}" in
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toggle ) ## Toggle current play
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debug_message "defined − \
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Use ${RED}MPC${COLOR_DEBUG} client for ${USER_MULTIMEDIA_COMMAND} command."
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MPD_COMMAND=$(mpc --quiet toggle)
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;;
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play ) ## Starts playing song (default number 1)
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debug_message "defined − \
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Use ${RED}MPC${COLOR_DEBUG} client for ${USER_MULTIMEDIA_COMMAND} command."
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MPD_COMMAND=$(mpc --quiet play)
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;;
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pause ) ## Pauses playing
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debug_message "defined − \
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Use ${RED}MPC${COLOR_DEBUG} client for ${USER_MULTIMEDIA_COMMAND} command."
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MPD_COMMAND=$(mpc --quiet pause)
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;;
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next ) ## Starts playing next song on queue
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debug_message "defined − \
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Use ${RED}MPC${COLOR_DEBUG} client for ${USER_MULTIMEDIA_COMMAND} command."
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MPD_COMMAND=$(mpc --quiet next)
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;;
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prev|previous ) ## Starts playing previous song
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debug_message "defined − \
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Use ${RED}MPC${COLOR_DEBUG} client for ${USER_MULTIMEDIA_COMMAND} command."
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MPD_COMMAND=$(mpc --quiet prev)
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;;
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random ) ## Toggle random mode
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debug_message "defined − \
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Use ${RED}MPC${COLOR_DEBUG} client for ${USER_MULTIMEDIA_COMMAND} command."
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MPD_COMMAND=$(mpc --quiet random)
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;;
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party|partymode|randomparty ) ## Start random playing
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debug_message "defined − \
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Use multiple ${RED}MPC${COLOR_DEBUG} commands for ${USER_MULTIMEDIA_COMMAND} action."
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MPD_COMMAND=$(mpc --quiet clear; mpc --quiet random on; mpc --quiet add /; mpc --quiet play)
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;;
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* ) ## unknow option
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printf '%b\n' "${RED}Invalid MPD|MPC command: ${USER_MULTIMEDIA_COMMAND}${RESET}"
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printf '%b\n' "---"
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usage
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exit 1
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;;
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esac
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## }}}
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}
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# }}}
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is_proc_absent() { # {{{
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local_proc_pattern="${1}"
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## Proc is absent by default
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return_proc_absent="0"
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local_count_proc_pattern="$(pgrep -f -- "${local_proc_pattern}" | wc -l)"
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case "${local_count_proc_pattern}" in
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0 ) ## No procs related to this pattern are running
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return_proc_absent="0"
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;;
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* ) ## At least one proc seems running
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return_proc_absent="1"
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;;
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esac
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## Simple debug message to valid current variables
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debug_message "is_proc_absent − \
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procs running (with the pattern: ${RED}${local_proc_pattern}${COLOR_DEBUG}) on the current host: ${RED}${local_count_proc_pattern}${COLOR_DEBUG}."
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return "${return_proc_absent}"
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}
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# }}}
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main() { # {{{
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## Define all vars
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define_vars
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## If MPD is not running {{{
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### AND Start it
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### AND exit 0
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is_proc_absent "${MPD_PROC_REGEXP}" \
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&& debug_message "Start ${RED}mpd with systemd${COLOR_DEBUG}." \
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&& systemctl --user start mpd.service \
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&& mpc --quiet random off \
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&& exit 0
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## }}}
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## Send MPD action to running instance {{{
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### And exit
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debug_message "Send ${RED}${USER_MULTIMEDIA_COMMAND}${COLOR_DEBUG} action to running MPD instance." \
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"${MPD_COMMAND}" \
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&& exit 0
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## }}}
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}
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# }}}
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# Manage arguments # {{{
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# This code can't be in a function due to argument management
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if [ ! "${NBARGS}" -eq "0" ]; then
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manage_arg="0"
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## If the first argument is not an option
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if ! printf -- '%s' "${1}" | grep -q -E -- "^-+";
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then
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## Print help message and exit
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printf '%b\n' "${RED}Invalid option: ${1}${RESET}"
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printf '%b\n' "---"
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usage
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exit 1
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fi
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# Parse all options (start with a "-") one by one
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while printf -- '%s' "${1}" | grep -q -E -- "^-+"; do
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case "${1}" in
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-c|--command ) ## User command
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### Move to the next argument
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shift
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### Define var
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USER_MULTIMEDIA_COMMAND="${1}"
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;;
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-d|--debug ) ## debug
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DEBUG=0
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;;
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-h|--help ) ## help
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usage
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## Exit after help informations
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exit 0
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;;
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* ) ## unknow option
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printf '%b\n' "${RED}Invalid option: ${1}${RESET}"
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printf '%b\n' "---"
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usage
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exit 1
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;;
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esac
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debug_message "Arguments management − \
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${RED}${1}${COLOR_DEBUG} option|command managed."
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## Move to the next argument
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shift
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manage_arg=$((manage_arg+1))
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done
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debug_message "Arguments management − \
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${RED}${manage_arg}${COLOR_DEBUG} argument(s) successfully managed."
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else
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debug_message "Arguments management − \
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No arguments/options to manage."
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fi
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# }}}
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main
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exit 255
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