[recipes] Added setting for preferred temperature unit.

[Matthias Clasen <matthiasc src gnome org>]

commit c39338398e2629effeabdcc05c91e244836ae7ea
Author: Ekta Nandwani <mailnandwaniekta gmail com>
Date:   Wed Apr 26 13:09:26 2017 +0530

    Added setting for preferred temperature unit.
    
    Added a enum setting in data/org.gnome/recipes.gchema.xml for
    whether to display temperatures in celcius or fahrenheit, with the
    default set to the more internationally recognized celcius.
    
    gr-recipe-formatter.c now finds that setting and converts the temp
    to the preferred unit.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=778695

 data/org.gnome.Recipes.gschema.xml |   13 +++++++++++++
 src/gr-recipe-formatter.c          |   28 ++++++++++++++++++++++++++--
 2 files changed, 39 insertions(+), 2 deletions(-)
---
diff --git a/data/org.gnome.Recipes.gschema.xml b/data/org.gnome.Recipes.gschema.xml
index 4e8b660..c35f17c 100644
--- a/data/org.gnome.Recipes.gschema.xml
+++ b/data/org.gnome.Recipes.gschema.xml
@@ -1,6 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <schemalist>
 
+  <enum id="org.gnome.recipes.TemperatureUnit">
+    <value nick="celsius" value="0"/>
+    <value nick="fahrenheit" value="1"/>
+  </enum>
+
   <schema path="/org/gnome/recipes/" id="org.gnome.Recipes" gettext-domain="gnome-recipes">
 
     <key type="s" name="user">
@@ -63,6 +68,14 @@
       </description>
     </key>
 
+      <key name="temperature-unit" enum="org.gnome.recipes.TemperatureUnit">
+      <default>'celsius'</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.
+      </description>
+    </key>
+
   </schema>
 
 </schemalist>
diff --git a/src/gr-recipe-formatter.c b/src/gr-recipe-formatter.c
index 92880d7..32ade0e 100644
--- a/src/gr-recipe-formatter.c
+++ b/src/gr-recipe-formatter.c
@@ -19,7 +19,9 @@
  */
 
 #include "config.h"
-
+#include <stdbool.h>
+#include <gtk/gtk.h>
+#include "gr-settings.h"
 #include <stdlib.h>
 #include <glib/gi18n.h>
 
@@ -30,6 +32,17 @@
 #include "gr-recipe-store.h"
 #include "gr-utils.h"
 
+typedef enum {
+        GR_TEMPERATURE_UNIT_CELSIUS    = 0,
+        GR_TEMPERATURE_UNIT_FAHRENHEIT = 1
+} GrTemperatureUnit;
+
+static gint
+get_temperature_unit (void)
+{
+        GSettings *settings = gr_settings_get();
+        return  g_settings_get_enum (settings, "temperature-unit"); }
+
 char *
 gr_recipe_format (GrRecipe *recipe)
 {
@@ -129,6 +142,7 @@ gr_recipe_parse_instructions (const char *instructions,
         GPtrArray *step_array;
         g_auto(GStrv) steps = NULL;
         int i;
+        gint user_unit = get_temperature_unit ();
 
         step_array = g_ptr_array_new_with_free_func (recipe_step_free);
 
@@ -163,7 +177,17 @@ gr_recipe_parse_instructions (const char *instructions,
                                         unit = "℃";
                                 }
                                 num = atoi (p + strlen ("[temperature:"));
-
+                                
+                                if ((strcmp (unit, "℃") == 0 && (user_unit == GR_TEMPERATURE_UNIT_CELSIUS)) 
|| (strcmp (unit, "℉") == 0 && (user_unit == GR_TEMPERATURE_UNIT_FAHRENHEIT))) 
+                                        {
+                                ;}
+                                else if (strcmp (unit, "℃") == 0 && (user_unit == 
GR_TEMPERATURE_UNIT_FAHRENHEIT)) {
+                                        num = (num * 1.8) + 32;
+                                        unit = "℉"; }
+                                else if (strcmp (unit, "℉") == 0 && (user_unit == 
GR_TEMPERATURE_UNIT_CELSIUS)){
+                                        num = (num - 32) / 1.8;
+                                        unit = "℃"; }
+                                
                                 tmp = g_strdup_printf ("%s%d%s%s", prefix, num, unit, q + 1);
                                 g_free (step);
                                 step = tmp;