[glom] glom_get_locale_date_format(): Make this work even when LANGUAGE is set.

[Murray Cumming <murrayc src gnome org>]

commit 3d41e98a96e206be78f58bb775d54c19b31ef186
Author: Murray Cumming <murrayc murrayc com>
Date:   Mon Jan 19 09:12:12 2015 +0100

    glom_get_locale_date_format(): Make this work even when LANGUAGE is set.
    
    By temporarily unsetting LANGUAGE while getting LC_TIME via
    setlocale(LC_TIME, NULL). As Geary does already too.

 glom/libglom/data_structure/glomconversions.cc |   17 +++++++++++++++++
 tests/test_glom_date_in_locales_lc_time.sh.in  |   18 +++++++++++++-----
 2 files changed, 30 insertions(+), 5 deletions(-)
---
diff --git a/glom/libglom/data_structure/glomconversions.cc b/glom/libglom/data_structure/glomconversions.cc
index 3d43770..a17bf87 100644
--- a/glom/libglom/data_structure/glomconversions.cc
+++ b/glom/libglom/data_structure/glomconversions.cc
@@ -89,6 +89,17 @@ static inline const char* glom_get_locale_date_format()
   if(!c_locale_date_format)
   {
     //Get the current LC_TIME value:
+
+    //Unset LANGUAGE because it affects what setlocale(LC_TIME, NULL) returns,
+    //though it doesn't affect what, for instance, printf() uses. So unsetting
+    //it lets us get the correct LC_TIME locale.
+    const char* ENV_LANGUAGE = "LANGUAGE";
+    char* language = getenv(ENV_LANGUAGE);
+    if(language)
+      language = g_strdup(language);
+
+    setenv(ENV_LANGUAGE, "", 1 /* replace */);
+
     //We copy the string because setlocale() probably returns the same array
     //each time.
     //Even when the LC_TIME environment variable is not set, we still seem
@@ -139,8 +150,14 @@ static inline const char* glom_get_locale_date_format()
       setlocale(LC_MESSAGES, old_lc_messages);
     }
 
+    //Restore this:
+    if(language) { //setenv() can't take NULL for this.
+      setenv(ENV_LANGUAGE, language, 1 /* replace */);
+   }
+
     g_free(old_lc_messages);
     g_free(lc_time);
+    g_free(language);
   }
 
   //std::cout << G_STRFUNC << ": c_locale_date_format=" << c_locale_date_format << std::endl;
diff --git a/tests/test_glom_date_in_locales_lc_time.sh.in b/tests/test_glom_date_in_locales_lc_time.sh.in
index 42bc84a..5ef357b 100644
--- a/tests/test_glom_date_in_locales_lc_time.sh.in
+++ b/tests/test_glom_date_in_locales_lc_time.sh.in
@@ -26,18 +26,26 @@ function test_date {
 
   echo testing with LANG="$lang" and LC_TIME="$lc_time"
   export LANG="$lang"
+  export LC_TIME="$lc_time"
 
-  # We don't set LANGUAGE because that seems to affect what setlocale() returns
-  # for LC_TIME (so we can't get the translated "%x"),
-  # though LC_TIME still affects printf(),
-  # Maybe we need to handle that too.
-  #  export LANGUAGE="$lang"
+  @abs_top_builddir@/glom/glom --debug-date-check || exit 1
+}
+
+function test_date_with_language {
+  lang="$1"
+  lc_time="$2"       
+
+  echo testing with LANG="$lang" and LC_TIME="$lc_time"
+  export LANG="$lang"
+  export LANGUAGE="$lang"
   export LC_TIME="$lc_time"
 
   @abs_top_builddir@/glom/glom --debug-date-check || exit 1
 }
 
 test_date "en_US.UTF-8" "en_GB.UTF-8"
+test_date_with_language "en_US.UTF-8" "en_GB.UTF-8"
 test_date "en_US.UTF-8" "es_ES.UTF-8"
+test_date_with_language "en_US.UTF-8" "es_ES.UTF-8"