Bug #685051 Adding --mid-search option to --list

This will enable users to find a row with a text matching the
middle of the row.

Consider the following list:

    Little piggy one
    Little piggy two
    Little piggy three

As a user I would expect that entering 'th' would focus the last row, because
it's the first one that contains 'th'

1 files changed, 14 insertions, 0 deletions

diff --git a/src/tree.c b/src/tree.c
index a8b324f7..819f9a8e 100644
--- a/src/tree.c
+++ b/src/tree.c
@@ -298,6 +298,17 @@ zenity_tree_fill_entries (GtkTreeView  *tree_view,
   }
 }
 
+static gboolean
+zenity_mid_search_func (GtkTreeModel *model, gint column,
+                    const gchar *key, GtkTreeIter *iter,
+                    gpointer search_data)
+{
+    gchar *iter_string = NULL;
+    gtk_tree_model_get (model, iter, column, &iter_string, -1); 
+    return  ! g_strrstr (g_utf8_strdown(iter_string, -1), 
+                         g_utf8_strdown(key, -1)) != NULL;
+}
+
 static void
 zenity_cell_edited_callback (GtkCellRendererText *cell, 
                              const gchar         *path_string, 
@@ -564,6 +575,9 @@ zenity_tree (ZenityData *data, ZenityTreeData *tree_data)
 
   zenity_util_show_dialog (dialog, data->attach);
 
+  if (tree_data->mid_search)
+    gtk_tree_view_set_search_equal_func(GTK_TREE_VIEW(tree_view), (GtkTreeViewSearchEqualFunc) zenity_mid_search_func, model, NULL);
+
   if(data->timeout_delay > 0) {
     g_timeout_add_seconds (data->timeout_delay, (GSourceFunc) zenity_util_timeout_handle, dialog);
   }