scripts/mpd.controller.sh

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