po: extract translatable strings from wireplumber.conf

Add rules to extract translatable strings from wireplumber.conf.

Meson i18n.gettext does not support extracting strings from
autogenerated files. Hence, we must commit conf.pot to repository.

These setting descriptions are meant to be user-facing. Translating them
allows also 3rd party apps to get the translations from 'wireplumber'
domain.

meson.build

@@ -160,6 +160,8 @@ common_args = [
 ]
 add_project_arguments(common_args, language: 'c')
 
+i18n_conf = files()
+
 subdir('lib')
 if build_modules
   subdir('modules')

po/POTFILES.in

@@ -1,3 +1,4 @@
 src/scripts/monitors/alsa.lua
 src/scripts/monitors/bluez-midi.lua
 src/scripts/monitors/libcamera/name-node.lua
+po/conf.pot

po/conf.pot

@@ -0,0 +1,110 @@
+msgid ""
+msgstr ""
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+
+#. /wireplumber.settings.schema/bluetooth.autoswitch-to-headset-profile/description
+#: wireplumber.conf
+msgid "Always show microphone for Bluetooth headsets, and switch to headset mode when recording"
+msgstr ""
+
+#. /wireplumber.settings.schema/bluetooth.use-persistent-storage/description
+#: wireplumber.conf
+msgid "Remember and restore Bluetooth headset mode status"
+msgstr ""
+
+#. /wireplumber.settings.schema/device.restore-profile/description
+#: wireplumber.conf
+msgid "Remember and restore device profiles"
+msgstr ""
+
+#. /wireplumber.settings.schema/device.restore-routes/description
+#: wireplumber.conf
+msgid "Remember and restore device routes"
+msgstr ""
+
+#. /wireplumber.settings.schema/device.routes.default-sink-volume/description
+#: wireplumber.conf
+msgid "The default volume for audio sinks"
+msgstr ""
+
+#. /wireplumber.settings.schema/device.routes.default-source-volume/description
+#: wireplumber.conf
+msgid "The default volume for audio sources"
+msgstr ""
+
+#. /wireplumber.settings.schema/linking.allow-moving-streams/description
+#: wireplumber.conf
+msgid "Streams may be moved by adding PipeWire metadata at runtime"
+msgstr ""
+
+#. /wireplumber.settings.schema/linking.follow-default-target/description
+#: wireplumber.conf
+msgid "Streams connected to the default device follow when default changes"
+msgstr ""
+
+#. /wireplumber.settings.schema/linking.pause-playback/description
+#: wireplumber.conf
+msgid "Pause media players if their target sink is removed"
+msgstr ""
+
+#. /wireplumber.settings.schema/linking.role-based.duck-level/description
+#: wireplumber.conf
+msgid "The volume level to apply when ducking (= reducing volume for a higher priority stream to be audible) in the role-based linking policy"
+msgstr ""
+
+#. /wireplumber.settings.schema/monitor.camera-discovery-timeout/description
+#: wireplumber.conf
+msgid "The camera discovery timeout in milliseconds"
+msgstr ""
+
+#. /wireplumber.settings.schema/node.features.audio.control-port/description
+#: wireplumber.conf
+msgid "Enable control ports on audio nodes"
+msgstr ""
+
+#. /wireplumber.settings.schema/node.features.audio.monitor-ports/description
+#: wireplumber.conf
+msgid "Enable monitor ports on audio nodes"
+msgstr ""
+
+#. /wireplumber.settings.schema/node.features.audio.no-dsp/description
+#: wireplumber.conf
+msgid "Do not convert audio to F32 format"
+msgstr ""
+
+#. /wireplumber.settings.schema/node.filter.forward-format/description
+#: wireplumber.conf
+msgid "Forward format on filter nodes or not"
+msgstr ""
+
+#. /wireplumber.settings.schema/node.restore-default-targets/description
+#: wireplumber.conf
+msgid "Remember and restore default audio/video input/output devices"
+msgstr ""
+
+#. /wireplumber.settings.schema/node.stream.default-capture-volume/description
+#: wireplumber.conf
+msgid "The default volume for capture nodes"
+msgstr ""
+
+#. /wireplumber.settings.schema/node.stream.default-media-role/description
+#: wireplumber.conf
+msgid "Default media.role to assign on streams that do not specify it"
+msgstr ""
+
+#. /wireplumber.settings.schema/node.stream.default-playback-volume/description
+#: wireplumber.conf
+msgid "The default volume for playback nodes"
+msgstr ""
+
+#. /wireplumber.settings.schema/node.stream.restore-props/description
+#: wireplumber.conf
+msgid "Remember and restore properties of streams"
+msgstr ""
+
+#. /wireplumber.settings.schema/node.stream.restore-target/description
+#: wireplumber.conf
+msgid "Remember and restore stream targets"
+msgstr ""
+

po/meson.build

@@ -1,5 +1,24 @@
 i18n = import('i18n')
 
+pymod = import('python')
+python_po = pymod.find_installation('python3')
+spa_json_dump_po = find_program('spa-json-dump', required: false)
+
+if python_po.found() and spa_json_dump_po.found()
+  conf_pot = custom_target('conf.pot',
+    input : i18n_conf,
+    output : 'conf.pot',
+    build_by_default : true,
+    command : [
+      python_po, spa_json_po, '--spa-json-dump=' + spa_json_dump_po.full_path(),
+      '-k', '/wireplumber.settings.schema/[^/]*/description$',
+      '-o', '@CURRENT_SOURCE_DIR@/conf.pot',
+      '@INPUT@',
+    ],
+    capture: true,
+  )
+endif
+
 i18n.gettext(
   meson.project_name(),
   preset: 'glib',

src/config/meson.build

@@ -4,3 +4,5 @@ install_subdir('wireplumber.conf.d.examples',
   install_dir : wireplumber_doc_dir / 'examples' / 'wireplumber.conf.d',
   strip_directory : true,
 )
+
+i18n_conf += files('wireplumber.conf')