Add i18n support

8 files changed, 77 insertions, 23 deletions

diff --git a/src/CanvasModule.cpp b/src/CanvasModule.cpp
index d3908df..e93cefe 100644
--- a/src/CanvasModule.cpp
+++ b/src/CanvasModule.cpp
@@ -90,15 +90,15 @@ CanvasModule::show_menu(GdkEventButton* ev)
 
   if (_type == SignalDirection::duplex) {
     items.push_back(Gtk::Menu_Helpers::MenuElem(
-      "_Split", sigc::mem_fun(this, &CanvasModule::on_split)));
+      _("_Split"), sigc::mem_fun(this, &CanvasModule::on_split)));
     update_menu();
   } else {
     items.push_back(Gtk::Menu_Helpers::MenuElem(
-      "_Join", sigc::mem_fun(this, &CanvasModule::on_join)));
+      _("_Join"), sigc::mem_fun(this, &CanvasModule::on_join)));
   }
 
   items.push_back(Gtk::Menu_Helpers::MenuElem(
-    "_Disconnect", sigc::mem_fun(this, &CanvasModule::on_disconnect)));
+    _("_Disconnect"), sigc::mem_fun(this, &CanvasModule::on_disconnect)));
 
   _menu->popup(ev->button, ev->time);
   return true;
diff --git a/src/CanvasPort.hpp b/src/CanvasPort.hpp
index 548c9e5..c3195a9 100644
--- a/src/CanvasPort.hpp
+++ b/src/CanvasPort.hpp
@@ -6,6 +6,7 @@
 
 #include "PortID.hpp"
 #include "PortType.hpp"
+#include "i18n.hpp"
 #include "warnings.hpp"
 
 PATCHAGE_DISABLE_GANV_WARNINGS
@@ -82,7 +83,7 @@ public:
 
     Gtk::Menu* menu = Gtk::manage(new Gtk::Menu());
     menu->items().push_back(Gtk::Menu_Helpers::MenuElem(
-      "Disconnect", sigc::mem_fun(this, &Port::disconnect)));
+      _("Disconnect"), sigc::mem_fun(this, &Port::disconnect)));
 
     menu->popup(ev->button.button, ev->button.time);
     return true;
diff --git a/src/Legend.cpp b/src/Legend.cpp
index bdf51bc..a4e8705 100644
--- a/src/Legend.cpp
+++ b/src/Legend.cpp
@@ -5,6 +5,7 @@
 
 #include "Configuration.hpp"
 #include "PortType.hpp"
+#include "i18n.hpp"
 #include "patchage_config.h"
 
 #include <gdkmm/color.h>
@@ -23,7 +24,7 @@ namespace patchage {
 Legend::Legend(const Configuration& configuration)
 {
   add_button(PortType::jack_audio,
-             "Audio",
+             _("Audio"),
              configuration.get_port_color(PortType::jack_audio));
 
 #if USE_JACK_METADATA
diff --git a/src/Patchage.cpp b/src/Patchage.cpp
index 1f3d706..c3166c2 100644
--- a/src/Patchage.cpp
+++ b/src/Patchage.cpp
@@ -23,6 +23,7 @@
 #include "Widget.hpp"
 #include "event_to_string.hpp"
 #include "handle_event.hpp"
+#include "i18n.hpp"
 #include "patchage_config.h" // IWYU pragma: keep
 #include "warnings.hpp"
 
@@ -445,11 +446,14 @@ Patchage::update_toolbar()
     const auto buffer_size = _drivers.jack()->buffer_size();
     const auto sample_rate = _drivers.jack()->sample_rate();
     if (sample_rate != 0) {
-      const auto latency_ms =
-        buffer_size * 1000 / static_cast<float>(sample_rate);
+      const auto sample_rate_khz = sample_rate / 1000.0;
+      const auto latency_ms      = buffer_size / sample_rate_khz;
+
+      _latency_label->set_label(" " +
+                                fmt::format(_("frames at {} kHz ({:0.2f} ms)"),
+                                            sample_rate_khz,
+                                            latency_ms));
 
-      _latency_label->set_label(fmt::format(
-        " frames @ {} kHz ({:0.2f} ms)", sample_rate / 1000, latency_ms));
       _latency_label->set_visible(true);
       _buf_size_combo->set_active(
         static_cast<int>(log2f(_drivers.jack()->buffer_size()) - 5));
@@ -467,12 +471,13 @@ Patchage::update_load()
 {
   if (_drivers.jack() && _drivers.jack()->is_attached()) {
     const auto xruns = _drivers.jack()->xruns();
+
+    _dropouts_label->set_text(" " + fmt::format(_("Dropouts: {}"), xruns));
+
     if (xruns > 0u) {
-      _dropouts_label->set_text(fmt::format(" Dropouts: {}", xruns));
       _dropouts_label->show();
       _clear_load_but->show();
     } else {
-      _dropouts_label->set_text(" Dropouts: 0");
       _dropouts_label->hide();
       _clear_load_but->hide();
     }
@@ -502,7 +507,7 @@ Patchage::store_window_location()
 void
 Patchage::clear_load()
 {
-  _dropouts_label->set_text(" Dropouts: 0");
+  _dropouts_label->set_text(" " + fmt::format(_("Dropouts: {}"), 0U));
   _dropouts_label->hide();
   _clear_load_but->hide();
   if (_drivers.jack()) {
@@ -830,7 +835,9 @@ Patchage::on_quit()
 void
 Patchage::on_export_image()
 {
-  Gtk::FileChooserDialog dialog("Export Image", Gtk::FILE_CHOOSER_ACTION_SAVE);
+  Gtk::FileChooserDialog dialog(_("Export Image"),
+                                Gtk::FILE_CHOOSER_ACTION_SAVE);
+
   dialog.add_button(Gtk::Stock::CANCEL, Gtk::RESPONSE_CANCEL);
   dialog.add_button(Gtk::Stock::SAVE, Gtk::RESPONSE_OK);
   dialog.set_default_response(Gtk::RESPONSE_OK);
@@ -850,7 +857,7 @@ Patchage::on_export_image()
     dialog.add_filter(filt);
   }
 
-  auto* bg_but = new Gtk::CheckButton("Draw _Background", true);
+  auto* bg_but = new Gtk::CheckButton(_("Draw _Background"), true);
   auto* extra  = new Gtk::Alignment(1.0, 0.5, 0.0, 0.0);
   bg_but->set_active(true);
   extra->add(*Gtk::manage(bg_but));
@@ -860,12 +867,12 @@ Patchage::on_export_image()
   if (dialog.run() == Gtk::RESPONSE_OK) {
     const std::string filename = dialog.get_filename();
     if (Glib::file_test(filename, Glib::FILE_TEST_EXISTS)) {
-      Gtk::MessageDialog confirm(std::string("File exists!  Overwrite ") +
-                                   filename + "?",
-                                 true,
-                                 Gtk::MESSAGE_WARNING,
-                                 Gtk::BUTTONS_YES_NO,
-                                 true);
+      Gtk::MessageDialog confirm(
+        fmt::format(_("File exists!  Overwrite {}?"), filename),
+        true,
+        Gtk::MESSAGE_WARNING,
+        Gtk::BUTTONS_YES_NO,
+        true);
       confirm.set_transient_for(dialog);
       if (confirm.run() != Gtk::RESPONSE_YES) {
         return;
diff --git a/src/i18n.hpp b/src/i18n.hpp
new file mode 100644
index 0000000..4cf082d
--- /dev/null
+++ b/src/i18n.hpp
@@ -0,0 +1,15 @@
+// Copyright 2022 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef PATCHAGE_I18N_HPP
+#define PATCHAGE_I18N_HPP
+
+#include <libintl.h>
+
+/// Mark a string literal as translatable
+#define _(msgid) gettext(msgid)
+
+/// Mark a string literal as non-translatable
+// #define N_(msgid) (msgid)
+
+#endif // PATCHAGE_I18N_HPP
diff --git a/src/main.cpp b/src/main.cpp
index 4466e15..d76413f 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -21,6 +21,10 @@
 #include <glibmm/ustring.h>
 #include <gtkmm/main.h>
 
+#if USE_GETTEXT
+#  include <libintl.h>
+#endif
+
 #include <cstring>
 #include <exception>
 #include <iostream>
@@ -94,6 +98,13 @@ main(int argc, char** argv)
   set_bundle_environment();
 #endif
 
+#if USE_GETTEXT
+  setlocale(LC_ALL, "");
+  bindtextdomain("patchage", PATCHAGE_LOCALE_DIR);
+  bind_textdomain_codeset("patchage", "UTF-8");
+  textdomain("patchage");
+#endif
+
   try {
     Glib::thread_init();
 
diff --git a/src/patchage.ui.in b/src/patchage.ui.in
index c63566a..89d749d 100644
--- a/src/patchage.ui.in
+++ b/src/patchage.ui.in
@@ -362,7 +362,7 @@
                         <child>
                           <object class="GtkLabel" id="latency_label">
                             <property name="can_focus">False</property>
-                            <property name="label" translatable="yes">frames @ ? kHz (? ms)</property>
+                            <property name="label" translatable="yes">frames at ? kHz (? ms)</property>
                           </object>
                           <packing>
                             <property name="expand">False</property>
@@ -388,7 +388,7 @@
                   <object class="GtkLabel" id="dropouts_label">
                     <property name="can_focus">False</property>
                     <property name="visible">False</property>
-                    <property name="label" translatable="yes"> Dropouts: 0</property>
+                    <property name="label" translatable="yes">Dropouts: {}</property>
                   </object>
                 </child>
               </object>
@@ -502,7 +502,7 @@
     <property name="version">@PATCHAGE_VERSION@</property>
     <property name="copyright" translatable="no">© 2005-2022 David Robillard
 © 2008 Nedko Arnaudov</property>
-    <property name="comments" translatable="yes">A JACK and ALSA front-end.</property>
+    <property name="comments" translatable="yes">A modular patchbay for JACK and ALSA applications.</property>
     <property name="website">http://drobilla.net/software/patchage</property>
     <property name="license" translatable="no">                    GNU GENERAL PUBLIC LICENSE
                        Version 3, 29 June 2007
diff --git a/src/patchage_config.h b/src/patchage_config.h
index e5f56df..6c3ad90 100644
--- a/src/patchage_config.h
+++ b/src/patchage_config.h
@@ -46,6 +46,19 @@
 #    endif
 #  endif
 
+// GNU gettext()
+#  ifndef HAVE_GETTEXT
+#    ifdef __has_include
+#      if __has_include(<libintl.h>)
+#        define HAVE_GETTEXT 1
+#      else
+#        define HAVE_GETTEXT 0
+#      endif
+#    else
+#      define HAVE_GETTEXT 0
+#    endif
+#  endif
+
 // JACK metadata API
 #  ifndef HAVE_JACK_METADATA
 #    ifdef __has_include
@@ -75,6 +88,12 @@
 #  define USE_DLADDR 0
 #endif
 
+#if HAVE_GETTEXT
+#  define USE_GETTEXT 1
+#else
+#  define USE_GETTEXT 0
+#endif
+
 #if HAVE_JACK_METADATA
 #  define USE_JACK_METADATA 1
 #else