[gedit/wip/merge-encoding-settings: 17/23] gedit_settings_get_candidate_encodings()

[Sébastien Wilmet <swilmet src gnome org>]

commit 1ae511aa3706d72db7793957652a1cc3b0f5c85a
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Sat Mar 28 15:56:30 2015 +0100

    gedit_settings_get_candidate_encodings()
    
    So it is implemented in only one place.

 gedit/gedit-encoding-items.c   |   53 +++---------------------------
 gedit/gedit-encodings-dialog.c |   10 ++----
 gedit/gedit-settings.c         |   69 ++++++++++++++++++++++++++++++++++++++++
 gedit/gedit-settings.h         |    2 +
 gedit/gedit-tab.c              |   25 ++-------------
 5 files changed, 83 insertions(+), 76 deletions(-)
---
diff --git a/gedit/gedit-encoding-items.c b/gedit/gedit-encoding-items.c
index e580a72..4954325 100644
--- a/gedit/gedit-encoding-items.c
+++ b/gedit/gedit-encoding-items.c
@@ -74,58 +74,20 @@ gedit_encoding_item_get_name (GeditEncodingItem *item)
 GSList *
 gedit_encoding_items_get (void)
 {
-       const GtkSourceEncoding *utf8_encoding;
        const GtkSourceEncoding *current_encoding;
-       GSettings *settings;
-       gchar **settings_strv;
        GSList *encodings;
-       GSList *ret = NULL;
+       GSList *items = NULL;
        GSList *l;
 
-       utf8_encoding = gtk_source_encoding_get_utf8 ();
-       current_encoding = gtk_source_encoding_get_current ();
-
-       settings = g_settings_new ("org.gnome.gedit.preferences.encodings");
-
-       settings_strv = g_settings_get_strv (settings, GEDIT_SETTINGS_CANDIDATE_ENCODINGS);
-
-       /* First take the candidate encodings from GSettings. If the gsetting is
-        * empty, take the default candidates of GtkSourceEncoding.
-        */
-       if (settings_strv != NULL && settings_strv[0] != NULL)
-       {
-               encodings = _gedit_utils_encoding_strv_to_list ((const gchar * const *)settings_strv);
+       encodings = gedit_settings_get_candidate_encodings ();
 
-               /* Ensure that UTF-8 is present. */
-               if (utf8_encoding != current_encoding &&
-                   g_slist_find (encodings, utf8_encoding) == NULL)
-               {
-                       encodings = g_slist_prepend (encodings, (gpointer)utf8_encoding);
-               }
-
-               /* Ensure that the current locale encoding is present (if not
-                * present, it must be the first encoding).
-                */
-               if (g_slist_find (encodings, current_encoding) == NULL)
-               {
-                       encodings = g_slist_prepend (encodings, (gpointer)current_encoding);
-               }
-       }
-       else
-       {
-               encodings = gtk_source_encoding_get_default_candidates ();
-       }
+       current_encoding = gtk_source_encoding_get_current ();
 
        for (l = encodings; l != NULL; l = l->next)
        {
                const GtkSourceEncoding *enc = l->data;
                gchar *name;
 
-               if (enc == NULL)
-               {
-                       continue;
-               }
-
                if (enc == current_encoding)
                {
                        name = g_strdup_printf (_("Current Locale (%s)"),
@@ -136,15 +98,12 @@ gedit_encoding_items_get (void)
                        name = gtk_source_encoding_to_string (enc);
                }
 
-               ret = g_slist_prepend (ret, gedit_encoding_item_new (enc, name));
+               items = g_slist_prepend (items, gedit_encoding_item_new (enc, name));
        }
 
-       ret = g_slist_reverse (ret);
-
-       g_object_unref (settings);
-       g_strfreev (settings_strv);
        g_slist_free (encodings);
-       return ret;
+
+       return g_slist_reverse (items);
 }
 
 /* ex:set ts=8 noet: */
diff --git a/gedit/gedit-encodings-dialog.c b/gedit/gedit-encodings-dialog.c
index ea476ed..e0cdf84 100644
--- a/gedit/gedit-encodings-dialog.c
+++ b/gedit/gedit-encodings-dialog.c
@@ -93,7 +93,7 @@ get_chosen_encodings_list (GeditEncodingsDialog *dialog)
                iter_set = gtk_tree_model_iter_next (model, &iter);
        }
 
-       return ret;
+       return g_slist_reverse (ret);
 }
 
 static void
@@ -119,6 +119,7 @@ gedit_encodings_dialog_response (GtkDialog *gtk_dialog,
                        enc_list = get_chosen_encodings_list (dialog);
                        enc_strv = _gedit_utils_encoding_list_to_strv (enc_list);
 
+                       /* TODO save setting only if list modified. */
                        g_settings_set_strv (dialog->priv->enc_settings,
                                             GEDIT_SETTINGS_CANDIDATE_ENCODINGS,
                                             (const gchar * const *)enc_strv);
@@ -419,17 +420,13 @@ down_button_clicked_cb (GtkWidget            *button,
 static void
 init_liststores (GeditEncodingsDialog *dialog)
 {
-       gchar **enc_strv;
        GSList *chosen_encodings;
        GSList *all_encodings;
        GSList *l;
 
        /* Chosen encodings */
 
-       enc_strv = g_settings_get_strv (dialog->priv->enc_settings,
-                                       GEDIT_SETTINGS_CANDIDATE_ENCODINGS);
-
-       chosen_encodings = _gedit_utils_encoding_strv_to_list ((const gchar * const *)enc_strv);
+       chosen_encodings = gedit_settings_get_candidate_encodings ();
 
        for (l = chosen_encodings; l != NULL; l = l->next)
        {
@@ -453,7 +450,6 @@ init_liststores (GeditEncodingsDialog *dialog)
                append_encoding (dialog->priv->liststore_available, cur_encoding);
        }
 
-       g_strfreev (enc_strv);
        g_slist_free (chosen_encodings);
        g_slist_free (all_encodings);
 }
diff --git a/gedit/gedit-settings.c b/gedit/gedit-settings.c
index 1d38144..acc41ad 100644
--- a/gedit/gedit-settings.c
+++ b/gedit/gedit-settings.c
@@ -33,6 +33,7 @@
 #include "gedit-app.h"
 #include "gedit-view.h"
 #include "gedit-window.h"
+#include "gedit-utils.h"
 
 #define GEDIT_SETTINGS_LOCKDOWN_COMMAND_LINE "disable-command-line"
 #define GEDIT_SETTINGS_LOCKDOWN_PRINTING "disable-printing"
@@ -492,4 +493,72 @@ gedit_settings_set_list (GSettings    *settings,
        g_free (values);
 }
 
+static gboolean
+strv_is_empty (gchar **strv)
+{
+       if (strv == NULL || strv[0] == NULL)
+       {
+               return TRUE;
+       }
+
+       /* Contains one empty string. */
+       if (strv[1] == NULL && strv[0][0] == '\0')
+       {
+               return TRUE;
+       }
+
+       return FALSE;
+}
+
+/* Take in priority the candidate encodings from GSettings. If the gsetting is
+ * empty, take the default candidates of GtkSourceEncoding.
+ * Also, ensure that UTF-8 and the current locale encoding are present.
+ * TODO remove duplicates.
+ * Returns: a list of GtkSourceEncodings. Free with g_slist_free().
+ */
+GSList *
+gedit_settings_get_candidate_encodings (void)
+{
+       const GtkSourceEncoding *utf8_encoding;
+       const GtkSourceEncoding *current_encoding;
+       GSettings *settings;
+       gchar **settings_strv;
+       GSList *candidates;
+
+       utf8_encoding = gtk_source_encoding_get_utf8 ();
+       current_encoding = gtk_source_encoding_get_current ();
+
+       settings = g_settings_new ("org.gnome.gedit.preferences.encodings");
+
+       settings_strv = g_settings_get_strv (settings, GEDIT_SETTINGS_CANDIDATE_ENCODINGS);
+
+       if (strv_is_empty (settings_strv))
+       {
+               candidates = gtk_source_encoding_get_default_candidates ();
+       }
+       else
+       {
+               candidates = _gedit_utils_encoding_strv_to_list ((const gchar * const *)settings_strv);
+
+               /* Ensure that UTF-8 is present. */
+               if (utf8_encoding != current_encoding &&
+                   g_slist_find (candidates, utf8_encoding) == NULL)
+               {
+                       candidates = g_slist_prepend (candidates, (gpointer)utf8_encoding);
+               }
+
+               /* Ensure that the current locale encoding is present (if not
+                * present, it must be the first encoding).
+                */
+               if (g_slist_find (candidates, current_encoding) == NULL)
+               {
+                       candidates = g_slist_prepend (candidates, (gpointer)current_encoding);
+               }
+       }
+
+       g_object_unref (settings);
+       g_strfreev (settings_strv);
+       return candidates;
+}
+
 /* ex:set ts=8 noet: */
diff --git a/gedit/gedit-settings.h b/gedit/gedit-settings.h
index cd8228d..2b54af6 100644
--- a/gedit/gedit-settings.h
+++ b/gedit/gedit-settings.h
@@ -63,6 +63,8 @@ GeditLockdownMask      gedit_settings_get_lockdown                    (GeditSettings *gs);
 
 gchar                  *gedit_settings_get_system_font                 (GeditSettings *gs);
 
+GSList                 *gedit_settings_get_candidate_encodings         (void);
+
 /* Utility functions */
 GSList                 *gedit_settings_get_list                        (GSettings     *settings,
                                                                         const gchar   *key);
diff --git a/gedit/gedit-tab.c b/gedit/gedit-tab.c
index 4d345c7..5c1e207 100644
--- a/gedit/gedit-tab.c
+++ b/gedit/gedit-tab.c
@@ -1945,31 +1945,15 @@ end:
 static GSList *
 get_candidate_encodings (GeditTab *tab)
 {
+       GSList *candidates = NULL;
        GeditDocument *doc;
        GtkSourceFile *file;
-       GSettings *settings;
-       gchar **settings_strv;
        gchar *metadata_charset;
        const GtkSourceEncoding *file_encoding;
-       GSList *candidates = NULL;
-
-       settings = g_settings_new ("org.gnome.gedit.preferences.encodings");
 
-       settings_strv = g_settings_get_strv (settings, GEDIT_SETTINGS_CANDIDATE_ENCODINGS);
-
-       /* First take the candidate encodings from GSettings. If the gsetting is
-        * empty, take the default candidates of GtkSourceEncoding.
-        */
-       if (settings_strv != NULL && settings_strv[0] != NULL)
-       {
-               candidates = _gedit_utils_encoding_strv_to_list ((const gchar * const *)settings_strv);
-       }
-       else
-       {
-               candidates = gtk_source_encoding_get_default_candidates ();
-       }
+       candidates = gedit_settings_get_candidate_encodings ();
 
-       /* Then prepend the encoding stored in the metadata. */
+       /* Prepend the encoding stored in the metadata. */
        doc = gedit_tab_get_document (tab);
        metadata_charset = gedit_document_get_metadata (doc, GEDIT_METADATA_ATTRIBUTE_ENCODING);
 
@@ -1996,10 +1980,7 @@ get_candidate_encodings (GeditTab *tab)
                candidates = g_slist_prepend (candidates, (gpointer)file_encoding);
        }
 
-       g_object_unref (settings);
-       g_strfreev (settings_strv);
        g_free (metadata_charset);
-
        return candidates;
 }