[recipes] Add locale setting for temperature conversion

[Matthias Clasen <matthiasc src gnome org>]

commit 3bb40fa27b1c1f0425ca1f72c5339cfb887e860c
Author: Paxana Amanda Xander <VeganBikePunk Gmail com>
Date:   Wed May 10 19:26:03 2017 -0700

    Add locale setting for temperature conversion
    
    In addition to Fahrenheit and Celsius, added locale to the possible
    options for preferred temperature.  If locale is selected, it looks
    for a locale and chooses the preferred temperature unit for that
    area (generally Fahrenheit in the US and Celsius elsewhere).
    
    https://bugzilla.gnome.org/show_bug.cgi?id=778695

 data/org.gnome.Recipes.gschema.xml |    3 ++-
 src/gr-recipe-formatter.c          |   24 ++++++++++++++++++++++--
 2 files changed, 24 insertions(+), 3 deletions(-)
---
diff --git a/data/org.gnome.Recipes.gschema.xml b/data/org.gnome.Recipes.gschema.xml
index c35f17c..ad32a99 100644
--- a/data/org.gnome.Recipes.gschema.xml
+++ b/data/org.gnome.Recipes.gschema.xml
@@ -4,6 +4,7 @@
   <enum id="org.gnome.recipes.TemperatureUnit">
     <value nick="celsius" value="0"/>
     <value nick="fahrenheit" value="1"/>
+    <value nick="locale" value="2"/>
   </enum>
 
   <schema path="/org/gnome/recipes/" id="org.gnome.Recipes" gettext-domain="gnome-recipes">
@@ -69,7 +70,7 @@
     </key>
 
       <key name="temperature-unit" enum="org.gnome.recipes.TemperatureUnit">
-      <default>'celsius'</default>
+      <default>'locale'</default>
       <summary>The setting for which unit temperatures should be displayed in. </summary>
       <description>
       The setting for which unit temperatures should be displayed in.  Default is celsius.
diff --git a/src/gr-recipe-formatter.c b/src/gr-recipe-formatter.c
index 77de0be..0de372c 100644
--- a/src/gr-recipe-formatter.c
+++ b/src/gr-recipe-formatter.c
@@ -24,6 +24,8 @@
 #include "gr-settings.h"
 #include <stdlib.h>
 #include <glib/gi18n.h>
+#include <locale.h>
+#include <langinfo.h>
 
 #include "gr-recipe-formatter.h"
 #include "gr-ingredients-list.h"
@@ -34,14 +36,32 @@
 
 typedef enum {
         GR_TEMPERATURE_UNIT_CELSIUS    = 0,
-        GR_TEMPERATURE_UNIT_FAHRENHEIT = 1
+        GR_TEMPERATURE_UNIT_FAHRENHEIT = 1,
+        GR_TEMPERATURE_UNIT_LOCALE = 2
 } GrTemperatureUnit;
 
 static gint
 get_temperature_unit (void)
 {
+        gint unit;
+        const gchar *fmt;
+
         GSettings *settings = gr_settings_get();
-        return  g_settings_get_enum (settings, "temperature-unit"); }
+        unit =  g_settings_get_enum (settings, "temperature-unit"); 
+        if (unit == GR_TEMPERATURE_UNIT_CELSIUS || unit == GR_TEMPERATURE_UNIT_FAHRENHEIT) {
+                ;}
+        else if (unit == GR_TEMPERATURE_UNIT_LOCALE) {
+
+
+
+                fmt = nl_langinfo (_NL_MEASUREMENT_MEASUREMENT);
+                if (fmt && *fmt == 2)
+                        unit = GR_TEMPERATURE_UNIT_FAHRENHEIT;
+                else
+                        unit = GR_TEMPERATURE_UNIT_CELSIUS;
+        } 
+        return unit;
+        }
 
 char *
 gr_recipe_format (GrRecipe *recipe)