modules: add m-i18n

Add simple gettext i18n module.

Add Lua script API functions I18n.gettext, I18n.ngettext.

meson.build

@@ -17,6 +17,7 @@ wireplumber_bin_dir = get_option('prefix') / get_option('bindir')
 wireplumber_module_dir = get_option('prefix') / get_option('libdir') / 'wireplumber-' + wireplumber_api_version
 wireplumber_data_dir = get_option('prefix') / get_option('datadir') / 'wireplumber'
 wireplumber_config_dir = get_option('prefix') / get_option('sysconfdir') / 'wireplumber'
+wireplumber_locale_dir = get_option('prefix') / get_option('localedir')
 
 cc = meson.get_compiler('c')
 
@@ -86,6 +87,12 @@ summary({'systemd conf data': systemd.found(),
          'libsystemd': libsystemd_dep.found(),
          'libelogind': libelogind_dep.found()}, bool_yn: true)
 
+libintl_dep = dependency('intl', required: false)
+if not libintl_dep.found()
+  libintl_dep = cc.find_library('intl', required: false)
+endif
+summary({'libintl': libintl_dep.found()}, bool_yn: true)
+
 gnome = import('gnome')
 pkgconfig = import('pkgconfig')
 fs = import('fs')
@@ -116,6 +123,7 @@ subdir('lib')
 subdir('docs')
 subdir('modules')
 subdir('src')
+subdir('po')
 
 if get_option('tests')
   subdir('tests')

modules/meson.build

@@ -161,6 +161,19 @@ shared_library(
   dependencies : [wp_dep, pipewire_dep],
 )
 
+shared_library(
+  'wireplumber-module-i18n',
+  [
+    'module-i18n.c',
+  ],
+  c_args : [common_c_args, '-DG_LOG_DOMAIN="m-i18n"',
+            '-DGETTEXT_PACKAGE="@0@"'.format(meson.project_name()),
+            '-DLOCALEDIR="@0@"'.format(wireplumber_locale_dir)],
+  install : true,
+  install_dir : wireplumber_module_dir,
+  dependencies : [wp_dep, pipewire_dep, libintl_dep],
+)
+
 if libsystemd_dep.found() or libelogind_dep.found()
   shared_library(
     'wireplumber-module-logind',

modules/module-i18n.c

@@ -0,0 +1,97 @@
+/* WirePlumber
+ *
+ * Copyright © 2022 Collabora Ltd.
+ *    @author Pauli Virtanen <pav@iki.fi>
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include <wp/wp.h>
+#include <pipewire/pipewire.h>
+
+#include <libintl.h>
+
+#define NAME "i18n"
+
+struct _WpI18n
+{
+  WpPlugin parent;
+};
+
+enum {
+  ACTION_GETTEXT,
+  ACTION_NGETTEXT,
+  N_SIGNALS
+};
+
+static guint signals[N_SIGNALS] = {0};
+
+G_DECLARE_FINAL_TYPE (WpI18n, wp_i18n,
+                      WP, I18N, WpPlugin)
+G_DEFINE_TYPE (WpI18n, wp_i18n, WP_TYPE_PLUGIN)
+
+static void
+wp_i18n_init (WpI18n * self)
+{
+}
+
+static gchar *
+wp_i18n_gettext (WpI18n * self, const gchar * msgid)
+{
+  return g_strdup (dgettext (GETTEXT_PACKAGE, msgid));
+}
+
+static gchar *
+wp_i18n_ngettext (WpI18n * self, const gchar * msgid, const gchar *msgid_plural, gulong n)
+{
+  return g_strdup (dngettext (GETTEXT_PACKAGE, msgid, msgid_plural, n));
+}
+
+static void
+wp_i18n_enable (WpPlugin * plugin, WpTransition * transition)
+{
+  WpI18n * self = WP_I18N (plugin);
+
+  wp_object_update_features (WP_OBJECT (self), WP_PLUGIN_FEATURE_ENABLED, 0);
+}
+
+static void
+wp_i18n_disable (WpPlugin * plugin)
+{
+}
+
+static void
+wp_i18n_class_init (WpI18nClass * klass)
+{
+  WpPluginClass *plugin_class = (WpPluginClass *) klass;
+
+  bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR);
+  bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
+
+  plugin_class->enable = wp_i18n_enable;
+  plugin_class->disable = wp_i18n_disable;
+
+  signals[ACTION_GETTEXT] = g_signal_new_class_handler (
+      "gettext", G_TYPE_FROM_CLASS (klass),
+      G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
+      (GCallback) wp_i18n_gettext,
+      NULL, NULL, NULL, G_TYPE_STRING, 1,
+      G_TYPE_STRING);
+
+  signals[ACTION_NGETTEXT] = g_signal_new_class_handler (
+      "ngettext", G_TYPE_FROM_CLASS (klass),
+      G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
+      (GCallback) wp_i18n_ngettext,
+      NULL, NULL, NULL, G_TYPE_STRING, 3,
+      G_TYPE_STRING, G_TYPE_STRING, G_TYPE_ULONG);
+}
+
+WP_PLUGIN_EXPORT gboolean
+wireplumber__module_init (WpCore * core, GVariant * args, GError ** error)
+{
+  wp_plugin_register (g_object_new (wp_i18n_get_type (),
+          "name", NAME,
+          "core", core,
+          NULL));
+  return TRUE;
+}

modules/module-lua-scripting/api/api.lua

@@ -186,6 +186,29 @@ local Feature = {
   },
 }
 
+local I18n = {
+  gettext = function (msgid)
+    local i18n = WpPlugin.find("i18n")
+    if i18n then
+      return i18n:call("gettext", msgid)
+    else
+      return msgid
+    end
+  end,
+  ngettext = function (msgid, msgid_plural, n)
+    local i18n = WpPlugin.find("i18n")
+    if i18n then
+      return i18n:call("ngettext", msgid, msgid_plural, n)
+    else
+      if n == 1 then
+        return msgid
+      else
+        return msgid_plural
+      end
+    end
+  end
+}
+
 SANDBOX_EXPORT = {
   Debug = Debug,
   Id = Id,
@@ -209,4 +232,5 @@ SANDBOX_EXPORT = {
   State = WpState_new,
   LocalModule = WpImplModule_new,
   ImplMetadata = WpImplMetadata_new,
+  I18n = I18n
 }

po/POTFILES.in

@@ -0,0 +1 @@
+src/scripts/monitors/alsa.lua

po/meson.build

@@ -0,0 +1,12 @@
+i18n = import('i18n')
+
+i18n.gettext(
+  meson.project_name(),
+  preset: 'glib',
+  # Page width is set to 90 characters in order to avoid bad wrapping of the
+  # bug reporting address.
+  args: ['--msgid-bugs-address=https://gitlab.freedesktop.org/pipewire/wireplumber/issues/new',
+         '--width=90', '--keyword=I18n.gettext:1', '--keyword=I18n.ngettext:1,2']
+)
+
+po_dir = meson.current_source_dir()