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services: mpd: Rewrite using 'define-configuration'.
* gnu/services/audio.scm (mpd-configuration, mpd-output): Rewrite using define-configuration. (uglify-field-name, mpd-serialize-field, mpd-serialize-alist) (mpd-serialize-number, mpd-serialize-boolean, mpd-serialize-list-of-mpd-output) (mpd-serialize-configuration): New procedure. (list-of-mpd-output?): New predicate. (mpd-config->file, mpd-output->string): Remove procedure. Signed-off-by: Liliana Marie Prikler <liliana.prikler@gmail.com>
This commit is contained in:
Bruno Victal
Liliana Marie Prikler
parent
d9e2ad989a
commit
d7fd9ec209
1 changed files with 130 additions and 86 deletions
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@ -2,6 +2,7 @@
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;;; Copyright © 2017 Peter Mikkelsen <petermikkelsen10@gmail.com>
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;;; Copyright © 2019 Ricardo Wurmus <rekado@elephly.net>
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;;; Copyright © 2020 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2022 Bruno Victal <mirai@makinata.eu>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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@ -21,13 +22,15 @@
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(define-module (gnu services audio)
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#:use-module (guix gexp)
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#:use-module (gnu services)
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#:use-module (gnu services configuration)
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#:use-module (gnu services shepherd)
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#:use-module (gnu system shadow)
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#:use-module (gnu packages admin)
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#:use-module (gnu packages mpd)
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#:use-module (guix records)
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#:use-module (ice-9 match)
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#:use-module (ice-9 format)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-26)
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#:export (mpd-output
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mpd-output?
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mpd-configuration
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@ -40,93 +43,134 @@ (define-module (gnu services audio)
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;;;
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;;; Code:
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(define-record-type* <mpd-output>
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mpd-output make-mpd-output
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mpd-output?
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(type mpd-output-type
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(default "pulse"))
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(name mpd-output-name
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(default "MPD"))
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(enabled? mpd-output-enabled?
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(default #t))
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(tags? mpd-output-tags?
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(default #t))
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(always-on? mpd-output-always-on?
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(default #f))
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(mixer-type mpd-output-mixer-type
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;; valid: hardware, software, null, none
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(default #f))
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(extra-options mpd-output-extra-options
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(default '())))
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(define (uglify-field-name field-name)
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(let ((str (symbol->string field-name)))
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(string-join (string-split (if (string-suffix? "?" str)
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(string-drop-right str 1)
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str)
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#\-) "_")))
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(define-record-type* <mpd-configuration>
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mpd-configuration make-mpd-configuration
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mpd-configuration?
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(user mpd-configuration-user
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(default "mpd"))
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(music-dir mpd-configuration-music-dir
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(default "~/Music"))
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(playlist-dir mpd-configuration-playlist-dir
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(default "~/.mpd/playlists"))
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(db-file mpd-configuration-db-file
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(default "~/.mpd/tag_cache"))
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(state-file mpd-configuration-state-file
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(default "~/.mpd/state"))
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(sticker-file mpd-configuration-sticker-file
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(default "~/.mpd/sticker.sql"))
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(port mpd-configuration-port
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(default "6600"))
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(address mpd-configuration-address
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(default "any"))
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(outputs mpd-configuration-outputs
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(default (list (mpd-output)))))
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(define (mpd-serialize-field field-name value)
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#~(format #f "~a ~s~%" #$(if (string? field-name)
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field-name
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(uglify-field-name field-name))
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#$(if (string? value)
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value
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(object->string value))))
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(define (mpd-output->string output)
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"Convert the OUTPUT of type <mpd-output> to a configuration file snippet."
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(let ((extra (string-join
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(map (match-lambda
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((key . value)
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(format #f " ~a \"~a\""
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(string-map
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(lambda (c) (if (char=? c #\-) #\_ c))
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(symbol->string key))
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value)))
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(mpd-output-extra-options output))
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"\n")))
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(format #f "\
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audio_output {
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type \"~a\"
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name \"~a\"
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~:[ enabled \"no\"~%~;~]\
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~:[ tags \"no\"~%~;~]\
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~:[~; always_on \"yes\"~%~]\
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~@[ mixer_type \"~a\"~%~]\
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~a~%}~%"
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(mpd-output-type output)
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(mpd-output-name output)
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(mpd-output-enabled? output)
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(mpd-output-tags? output)
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(mpd-output-always-on? output)
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(mpd-output-mixer-type output)
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extra)))
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(define (mpd-serialize-alist field-name value)
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#~(string-append #$@(generic-serialize-alist list mpd-serialize-field
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value)))
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(define (mpd-config->file config)
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(apply
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mixed-text-file "mpd.conf"
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"pid_file \"" (mpd-file-name config "pid") "\"\n"
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(append (map mpd-output->string
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(mpd-configuration-outputs config))
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(map (match-lambda
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((config-name config-val)
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(string-append config-name " \"" (config-val config) "\"\n")))
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`(("user" ,mpd-configuration-user)
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("music_directory" ,mpd-configuration-music-dir)
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("playlist_directory" ,mpd-configuration-playlist-dir)
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("db_file" ,mpd-configuration-db-file)
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("state_file" ,mpd-configuration-state-file)
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("sticker_file" ,mpd-configuration-sticker-file)
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("port" ,mpd-configuration-port)
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("bind_to_address" ,mpd-configuration-address))))))
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(define mpd-serialize-string mpd-serialize-field)
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(define (mpd-serialize-boolean field-name value)
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(mpd-serialize-field field-name (if value "yes" "no")))
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(define (mpd-serialize-list-of-mpd-output field-name value)
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#~(string-append "\naudio_output {\n"
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#$@(map (cut serialize-configuration <>
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mpd-output-fields)
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value)
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"}\n"))
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(define (mpd-serialize-configuration configuration)
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(mixed-text-file
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"mpd.conf"
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(serialize-configuration configuration mpd-configuration-fields)))
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(define-configuration mpd-output
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(name
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(string "MPD")
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"The name of the audio output.")
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(type
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(string "pulse")
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"The type of audio output.")
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(enabled?
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(boolean #t)
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"Specifies whether this audio output is enabled when MPD is started. By
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default, all audio outputs are enabled. This is just the default
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setting when there is no state file; with a state file, the previous
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state is restored.")
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(tags?
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(boolean #t)
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"If set to @code{#f}, then MPD will not send tags to this output. This
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is only useful for output plugins that can receive tags, for example the
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@code{httpd} output plugin.")
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(always-on?
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(boolean #f)
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"If set to @code{#t}, then MPD attempts to keep this audio output always
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open. This may be useful for streaming servers, when you don’t want to
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disconnect all listeners even when playback is accidentally stopped.")
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(mixer-type
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(string "none")
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"This field accepts a symbol that specifies which mixer should be used
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for this audio output: the @code{hardware} mixer, the @code{software}
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mixer, the @code{null} mixer (allows setting the volume, but with no
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effect; this can be used as a trick to implement an external mixer
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External Mixer) or no mixer (@code{none}).")
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(extra-options
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(alist '())
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"An association list of option symbols to string values to be appended to
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the audio output configuration.")
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(prefix mpd-))
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(define list-of-mpd-output?
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(list-of mpd-output?))
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(define-configuration mpd-configuration
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(user
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(string "mpd")
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"The user to run mpd as.")
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(music-dir
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(string "~/Music")
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"The directory to scan for music files."
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(lambda (_ x)
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(mpd-serialize-field "music_directory" x)))
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(playlist-dir
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(string "~/.mpd/playlists")
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"The directory to store playlists."
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(lambda (_ x)
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(mpd-serialize-field "playlist_directory" x)))
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(db-file
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(string "~/.mpd/tag_cache")
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"The location of the music database.")
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(state-file
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(string "~/.mpd/state")
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"The location of the file that stores current MPD's state.")
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(sticker-file
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(string "~/.mpd/sticker.sql")
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"The location of the sticker database.")
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(port
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(string "6600")
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"The port to run mpd on.")
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(address
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(string "any")
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"The address that mpd will bind to.
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To use a Unix domain socket, an absolute path can be specified here."
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(lambda (_ x)
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(mpd-serialize-field "bind_to_address" x)))
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(outputs
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(list-of-mpd-output (list (mpd-output)))
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"The audio outputs that MPD can use.
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By default this is a single output using pulseaudio.")
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(prefix mpd-))
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(define (mpd-file-name config file)
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"Return a path in /var/run/mpd/ that is writable
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@ -143,7 +187,7 @@ (define (mpd-shepherd-service config)
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(start #~(make-forkexec-constructor
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(list #$(file-append mpd "/bin/mpd")
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"--no-daemon"
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#$(mpd-config->file config))
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#$(mpd-serialize-configuration config))
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#:environment-variables
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;; Required to detect PulseAudio when run under a user account.
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(list (string-append
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