Evas: Add API to reinit the language and use it in elementary.

Summary:
evas_common_language_from_locale_* functions kept static pointers
inside of its functions. Once these function was called, it was never reset.
It made big problems for harfbuzz and hyphenation. Also, Elementary
provides elm_language_set() API. Then we need to support it fully.
@fix

Test Plan: Test case for hyphenation is included in Evas test suite.

Reviewers: raster, tasn, herdsman, woohyun, z-wony, Blackmole, minudf

Subscribers: cedric, jpeg

Differential Revision: https://phab.enlightenment.org/D3864

src/lib/elementary/elm_main.c

@@ -1180,6 +1180,7 @@ EAPI void
 elm_language_set(const char *lang)
 {
    setlocale(LC_ALL, lang);
+   evas_language_reinit();
    _elm_win_translate();
    edje_language_set(lang);
 }

src/lib/evas/Evas_Common.h

@@ -5115,6 +5115,16 @@ EAPI int  evas_string_char_prev_get(const char *str, int pos, int *decoded) EINA
  */
 EAPI int  evas_string_char_len_get(const char *str) EINA_WARN_UNUSED_RESULT EINA_ARG_NONNULL(1);
 
+/**
+ * Reinitialize language from the environment.
+ *
+ * The locale can change while a process is running. This call tells evas to
+ * reload the locale from the environment like it does on start.
+ * @ingroup Evas_Utils
+ * @since 1.18
+ */
+EAPI void                    evas_language_reinit(void);
+
 /**
  * @defgroup Evas_Keys Key Input Functions
  *

src/lib/evas/canvas/evas_main.c

@@ -705,4 +705,10 @@ evas_ector_get(Evas_Public_Data *e)
    return e->engine.ector;
 }
 
+EAPI void
+evas_language_reinit(void)
+{
+   evas_common_language_reinit();
+}
+
 #include "canvas/evas_canvas.eo.c"

src/lib/evas/common/language/evas_language_utils.c

@@ -45,6 +45,9 @@
 #define EXPLICIT_SCRIPT(script) \
    (((script) != EVAS_SCRIPT_UNKNOWN) && ((script) > EVAS_SCRIPT_INHERITED))
 
+static char lang[6]; /* FIXME: Maximum length I know about */
+static char lang_full[32];
+
 static Evas_Script_Type
 _evas_common_language_char_script_search(Eina_Unicode unicode)
 {
@@ -135,7 +138,6 @@ evas_common_language_script_type_get(const Eina_Unicode *str, size_t len)
 const char *
 evas_common_language_from_locale_get(void)
 {
-   static char lang[6]; /* FIXME: Maximum length I know about */
    if (*lang) return lang;
 
    const char *locale;
@@ -163,8 +165,7 @@ evas_common_language_from_locale_get(void)
 const char *
 evas_common_language_from_locale_full_get(void)
 {
-   static char lang[32];
-   if (*lang) return lang;
+   if (*lang_full) return lang_full;
 
    const char *locale;
    locale = setlocale(LC_MESSAGES, NULL);
@@ -177,14 +178,20 @@ evas_common_language_from_locale_full_get(void)
              if ((c == '.') || (c == '@') || (c == ' ')) /* Looks like en_US.UTF8 or de_DE@euro or aa_ER UTF-8*/
                 break;
           }
-        strncpy(lang, locale, i);
-        lang[i] = '\0';
-        return lang;
+        strncpy(lang_full, locale, i);
+        lang_full[i] = '\0';
+        return lang_full;
      }
 
    return "";
 }
 
+void
+evas_common_language_reinit(void)
+{
+   *lang = *lang_full = '\0';
+}
+
 /*
  * @}
  */

src/lib/evas/common/language/evas_language_utils.h

@@ -131,5 +131,8 @@ evas_common_language_from_locale_get(void);
 
 const char *
 evas_common_language_from_locale_full_get(void);
+
+void
+evas_common_language_reinit(void);
 #endif
 

src/tests/evas/evas_test_textblock.c

@@ -3911,11 +3911,31 @@ _hyphenation_width_stress(Evas_Object *tb, Evas_Textblock_Cursor *cur)
 START_TEST(evas_textblock_hyphenation)
 {
    START_TB_TEST();
+   Evas_Coord w, fw;
+
+   const char *buf = "Automati-";
+   evas_object_textblock_text_markup_set(tb, buf);
+   evas_object_textblock_size_formatted_get(tb, &w, NULL);
+   evas_object_resize(tb, w, 100);
+
+   setlocale(LC_MESSAGES, "en_US.UTF-8");
+   /* Language should be reinitialized after calling setlocale(). */
+   evas_language_reinit();
+
+   buf = "Automatically";
+   evas_object_textblock_text_markup_set(tb, buf);
+   evas_textblock_cursor_format_prepend(cur, "<wrap=hyphenation>");
+   evas_object_textblock_size_formatted_get(tb, &fw, NULL);
+   ck_assert_int_eq(w, fw);
+
+   /* Restore locale */
+   setlocale(LC_MESSAGES, "C");
+   evas_language_reinit();
 
    /* SHY-HYPHEN (&shy;) */
    /* Note: placing &shy; in a ligature is errornuos, so for the sake
     * of this test, it was removed from the "officia" word */
-   const char *buf =
+   buf =
       "Lorem ipsum dolor sit amet, cons&shy;ectetur adipisicing elit,"
       " sed do eiusmod tempor incididunt ut labore et dolore magna aliqua."
       " Ut enim ad minim veniam, quis nostrud exer&shy;citation ullamco"
@@ -3928,7 +3948,8 @@ START_TEST(evas_textblock_hyphenation)
    evas_object_textblock_text_markup_set(tb, buf);
 
    /* Dictionary + locale fallback (en_US) */
-   setlocale(LC_MESSAGES, "en_US.UTF8");
+   setlocale(LC_MESSAGES, "en_US.UTF-8");
+   evas_language_reinit();
 
    /* Mixture of Dictionary with SHY-HYPHEN */
    _hyphenation_width_stress(tb, cur);