[gimp/osx-build: 38/46] OS X build: use the help locale from the system's preferences

[Sven Claussner <sclaussner src gnome org>]

commit 7c28f64511a4fc3d33fcf9d50583feb4f811f80c
Author: Simone Karin Lehmann <simone lisanet de>
Date:   Wed Jun 4 19:16:13 2014 +0200

    OS X build: use the help locale from the system's preferences
    
    Adaptions by Sven Claussner:
    - Only use this language if the user chose language="System Language" in
    Preferences/Interface.
    - Add some code comments.

 app/widgets/Makefile.am |   19 +++++---
 app/widgets/gimphelp.c  |  104 ++++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 115 insertions(+), 8 deletions(-)
---
diff --git a/app/widgets/Makefile.am b/app/widgets/Makefile.am
index 55dacc5..05d4164 100644
--- a/app/widgets/Makefile.am
+++ b/app/widgets/Makefile.am
@@ -1,18 +1,23 @@
 ## Process this file with automake to produce Makefile.in
 
+if PLATFORM_OSX
+xobjective_c = "-xobjective-c"
+endif
+
 AM_CPPFLAGS = \
         -DISO_CODES_LOCATION=\"$(ISO_CODES_LOCATION)\"         \
         -DISO_CODES_LOCALEDIR=\"$(ISO_CODES_LOCALEDIR)\"       \
        -DG_LOG_DOMAIN=\"Gimp-Widgets\"
 
 INCLUDES = \
-       -I$(top_builddir)       \
-       -I$(top_srcdir)         \
+       -I$(top_builddir)               \
+       -I$(top_srcdir)                 \
        -I$(top_builddir)/app   \
-       -I$(top_srcdir)/app     \
-       $(GEGL_CFLAGS)          \
-       $(GTK_CFLAGS)           \
-       -I$(includedir)
+       -I$(top_srcdir)/app             \
+       $(GEGL_CFLAGS)                  \
+       $(GTK_CFLAGS)                   \
+       -I$(includedir)                 \
+       $(xobjective_c)
 
 noinst_LIBRARIES = libappwidgets.a
 
@@ -434,4 +439,4 @@ widgets-enums.c: $(srcdir)/widgets-enums.h $(GIMP_MKENUMS)
                --dtail "    { 0, NULL, NULL }\n  };\n\n  static GType type = 0;\n\n  if (G_UNLIKELY (! 
type))\n    {\n      type = g_ type@_register_static (\"@EnumName \", values);\n      
gimp_type_set_translation_context (type, \"@enumnick \");\n      gimp_ type@_set_value_descriptions (type, 
descs);\n    }\n\n  return type;\n}\n" \
                $(srcdir)/widgets-enums.h > xgen-wec \
        && cp xgen-wec $(@F) \
-       && rm -f xgen-wec
+       && rm -f xgen-wec
\ No newline at end of file
diff --git a/app/widgets/gimphelp.c b/app/widgets/gimphelp.c
index e817ad9..a995706 100644
--- a/app/widgets/gimphelp.c
+++ b/app/widgets/gimphelp.c
@@ -23,6 +23,10 @@
 
 #include <string.h>
 
+#ifdef PLATFORM_OSX
+#import <Foundation/Foundation.h>
+#endif
+
 #include <gtk/gtk.h>
 
 #include "libgimpbase/gimpbase.h"
@@ -561,15 +565,113 @@ gimp_help_get_default_domain_uri (Gimp *gimp)
   return uri;
 }
 
+/**
+ * gimp_help_get_locales:
+ *
+ * @gimp:   the GIMP instance with the configuration to read from
+ *
+ * Returns: a colon (:) separated list of language identifiers in descending
+ * order of priority. The function evaluates in this order:
+ * 1. (help-locales "") in the gimprc file
+ * 2. the UI language from Preferences/Interface.
+ * On OS X: If the user has set the UI language to 'System Language', then
+ * the UI language from the OS X's System Preferences is returned.
+ */
 static gchar *
 gimp_help_get_locales (Gimp *gimp)
 {
-  GimpGuiConfig *config = GIMP_GUI_CONFIG (gimp->config);
+  GimpGuiConfig *config = GIMP_GUI_CONFIG(gimp->config);
+
+#ifdef PLATFORM_OSX
+  NSAutoreleasePool *pool;
+  NSUserDefaults *defaults;
+  NSArray *langArray;
+  NSString *languagesList;
+  gchar *languages = NULL;
+#endif
 
+  /* First check for preferred help locales in gimprc. */
   if (config->help_locales && strlen (config->help_locales))
     return g_strdup (config->help_locales);
 
+  /* If no help locale is preferred, use the locale from Preferences/Interface*/
+#ifdef PLATFORM_OSX
+  /* If GIMP's preferred locale is set to 'System language', then
+   * g_get_language_names()[0] is 'C' and we have to get the value from
+   * the OS X System Preferences.
+   */
+  if (!strcmp(g_get_language_names()[0],"C"))
+    {
+      pool = [[NSAutoreleasePool alloc] init];
+
+      defaults = [NSUserDefaults standardUserDefaults];
+      langArray = [defaults stringArrayForKey: @"AppleLanguages"];
+      /* Although we only need the first entry, get them all. */
+      languagesList = [langArray componentsJoinedByString: @":"];
+
+      /* Translate them from Mac OS X (new UNIX style) to old UNIX style.*/
+       languagesList = [languagesList
+       stringByReplacingOccurrencesOfString: @"az-Latn"
+       withString: @"az"];
+
+       languagesList = [languagesList
+       stringByReplacingOccurrencesOfString: @"ga-dots"
+       withString: @"ga"];
+
+       languagesList = [languagesList
+       stringByReplacingOccurrencesOfString: @"mn-Cyrl"
+       withString: @"mn"];
+
+       languagesList = [languagesList
+       stringByReplacingOccurrencesOfString: @"ms-Latn"
+       withString: @"ms"];
+
+       languagesList = [languagesList
+       stringByReplacingOccurrencesOfString: @"tg-Cyrl"
+       withString: @"tz"];
+
+       languagesList = [languagesList
+       stringByReplacingOccurrencesOfString: @"tt-Cyrl"
+       withString: @"tt"];
+
+       languagesList = [languagesList
+       stringByReplacingOccurrencesOfString: @"zh-Hans"
+       withString: @"zh_CN"];
+
+       languagesList = [languagesList
+       stringByReplacingOccurrencesOfString: @"zh-Hant"
+       withString: @"zh_TW"];
+
+       languagesList = [languagesList
+       stringByReplacingOccurrencesOfString: @"Arab"
+       withString: @"arabic"];
+
+       languagesList = [languagesList
+       stringByReplacingOccurrencesOfString: @"Cyrl"
+       withString: @"cyrillic"];
+
+       languagesList = [languagesList
+       stringByReplacingOccurrencesOfString: @"Mong"
+       withString: @"mongolian"];
+
+       languagesList = [languagesList
+       stringByReplacingOccurrencesOfString: @"-"
+       withString: @"_"];
+
+       /* Ensure that the default language 'en' is there. */
+      languagesList = [languagesList stringByAppendingString: @":en"];
+
+      languages = g_strdup ([languagesList UTF8String]);
+
+      [pool drain];
+      return languages;
+    }
+  else
+  return g_strjoinv (":", (gchar **) g_get_language_names ());
+#else
   return g_strjoinv (":", (gchar **) g_get_language_names ());
+#endif
+
 }
 
 static gchar *