Qt: Dynamic languages

- get language as soon as possible (before creating any Qt objects) to make all
  translations working
- dynamic list of supported languages
- runtime change of GUI language (no need to restart application)
- add flags icons support
- search for *.qm languages in buildin resources, then
  data dir called "languages" (main directory in sources or
  /usr/share/wireshark/languages), then user directory
  (UNIX: ~/.wireshark/languages); "languages" directory should contains
  files wireshark_xx.qm where xx is language code (en, en_GB, etc.),
  and optional xx.svg for flag icon
- try to fix some untranslated manually-created UI items
  (need manual reset text of those components)

Change-Id: I62ca8a8cddce47cec9dbcad6b0bd68b6cfd92229
Reviewed-on: https://code.wireshark.org/review/5041
Tested-by: Michal Labedzki <michal.labedzki@tieto.com>
Reviewed-by: Michal Labedzki <michal.labedzki@tieto.com>

1 files changed, 135 insertions, 0 deletions

diff --git a/ui/language.c b/ui/language.c
new file mode 100644
index 0000000000..9e6af04f72
--- /dev/null
+++ b/ui/language.c
@@ -0,0 +1,135 @@
+/* language.c
+ * Language "preference" handling routines
+ * Copyright 2014, Michal Labedzki for Tieto Corporation
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+
+#include <stdlib.h>
+#include <errno.h>
+
+#include <epan/epan.h>
+#include <epan/prefs.h>
+#include <epan/prefs-int.h>
+
+#include <wsutil/filesystem.h>
+#include <wsutil/file_util.h>
+
+#include "ui/language.h"
+#include "ui/simple_dialog.h"
+
+#define LANGUAGE_FILE_NAME      "language"
+#define LANGUAGE_PREF_LANGUAGE  "language"
+
+char *language = NULL;
+
+/* set one user's recent common file key/value pair */
+static prefs_set_pref_e
+read_language_pref(gchar *key, const gchar *value,
+                   void *private_data _U_, gboolean return_range_errors _U_)
+{
+    if (strcmp(key, LANGUAGE_PREF_LANGUAGE) == 0) {
+        if (language)
+            g_free(language);
+        if (!value || (value && !*value))
+            language = g_strdup("auto");
+        else
+            language = g_strdup(value);
+    }
+
+    return PREFS_SET_OK;
+}
+
+void
+read_language_prefs(void)
+{
+    char       *rf_path;
+    FILE       *rf;
+
+    rf_path = get_persconffile_path(LANGUAGE_FILE_NAME, FALSE);
+
+    if ((rf = ws_fopen(rf_path, "r")) != NULL) {
+        read_prefs_file(rf_path, rf, read_language_pref, NULL);
+
+        fclose(rf);
+    }
+
+    g_free(rf_path);
+}
+
+gboolean
+write_language_prefs(void)
+{
+    char        *pf_dir_path;
+    char        *rf_path;
+    FILE        *rf;
+
+    /* To do:
+    * - Split output lines longer than MAX_VAL_LEN
+    * - Create a function for the preference directory check/creation
+    *   so that duplication can be avoided with filter.c
+    */
+
+    /* Create the directory that holds personal configuration files, if
+        necessary.  */
+    if (create_persconffile_dir(&pf_dir_path) == -1) {
+        simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
+        "Can't create directory\n\"%s\"\nfor language file: %s.", pf_dir_path,
+        g_strerror(errno));
+        g_free(pf_dir_path);
+        return FALSE;
+    }
+
+    rf_path = get_persconffile_path(LANGUAGE_FILE_NAME, FALSE);
+    if ((rf = ws_fopen(rf_path, "w")) == NULL) {
+        simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
+        "Can't open recent file\n\"%s\": %s.", rf_path,
+        g_strerror(errno));
+        g_free(rf_path);
+        return FALSE;
+    }
+    g_free(rf_path);
+
+    fputs("# Language settings file for Wireshark " VERSION ".\n"
+        "#\n"
+        "# This file is regenerated each time Wireshark is quit.\n"
+        "# So be careful, if you want to make manual changes here.\n"
+        "\n", rf);
+
+    fprintf(rf, LANGUAGE_PREF_LANGUAGE ": %s\n", language);
+
+    fclose(rf);
+
+    return TRUE;
+}
+
+/*
+ * Editor modelines  -  http://www.wireshark.org/tools/modelines.html
+ *
+ * Local variables:
+ * c-basic-offset: 4
+ * tab-width: 8
+ * indent-tabs-mode: nil
+ * End:
+ *
+ * vi: set shiftwidth=4 tabstop=8 expandtab:
+ * :indentSize=4:tabSize=8:noTabs=true:
+ */