[recipes] Add completion for ingredients and units

[Matthias Clasen <matthiasc src gnome org>]

commit 2b4a27be64e378aa5ace5da81e2291e51d94b0d2
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Apr 20 22:35:06 2017 -0400

    Add completion for ingredients and units
    
    This is somewhat simple-minded, and not very efficient, but works.
    Future improvements:
    - Show and match the spelled-out unit name as well
    - Consider not showing the amount in each row
    - Show conversions, too

 src/gr-ingredients-viewer-row.c |  101 +++++++++++++++++++++++++++++++++++++++
 1 files changed, 101 insertions(+), 0 deletions(-)
---
diff --git a/src/gr-ingredients-viewer-row.c b/src/gr-ingredients-viewer-row.c
index 4631a1c..6a52c13 100644
--- a/src/gr-ingredients-viewer-row.c
+++ b/src/gr-ingredients-viewer-row.c
@@ -26,6 +26,7 @@
 #include "gr-ingredients-viewer-row.h"
 #include "gr-ingredients-viewer.h"
 #include "gr-ingredient.h"
+#include "gr-unit.h"
 
 
 struct _GrIngredientsViewerRow
@@ -429,9 +430,97 @@ drag_data_received (GtkWidget        *widget,
         g_signal_emit (source, signals[MOVE], 0, target);
 }
 
+static GtkTreeModel *
+get_ingredients_model (void)
+{
+        static GtkListStore *store = NULL;
+
+        if (store == NULL) {
+                const char **names;
+                int length;
+                int i;
+
+                store = gtk_list_store_new (1, G_TYPE_STRING);
+
+                names = gr_ingredient_get_names (&length);
+                for (i = 0; i < length; i++) {
+                        gtk_list_store_insert_with_values (store, NULL, -1,
+                                                           0, names[i],
+                                                           -1);
+                }
+        }
+
+        return GTK_TREE_MODEL (g_object_ref (store));
+}
+
+static void
+prepend_amount (GtkTreeModel *model,
+                GtkTreeIter  *iter,
+                GValue       *value,
+                gint          column,
+                gpointer      data)
+{
+        GrIngredientsViewerRow *row = data;
+        GtkTreeModelFilter *filter_model = GTK_TREE_MODEL_FILTER (model);
+        GtkTreeModel *child_model;
+        GtkTreeIter child_iter;
+        g_autofree char *unit = NULL;
+        g_autofree char *tmp = NULL;
+        g_autofree char *text = NULL;
+        g_auto(GStrv) strv = NULL;
+
+        text = g_strstrip (g_strdup (gtk_entry_get_text (GTK_ENTRY (row->unit_entry))));
+        strv = g_strsplit (text, " ", 2);
+
+        child_model = gtk_tree_model_filter_get_model (filter_model);
+        gtk_tree_model_filter_convert_iter_to_child_iter (filter_model, &child_iter, iter);
+
+        gtk_tree_model_get (child_model, &child_iter, column, &unit, -1);
+
+        tmp = g_strdup_printf ("%s %s", strv[0], unit);
+        g_value_set_string (value, tmp);
+}
+
+static GtkTreeModel *
+get_units_model (GrIngredientsViewerRow *row)
+{
+        static GtkListStore *store = NULL;
+        GtkTreeModel *model;
+        GType types[1];
+
+        if (store == NULL) {
+                const char **names;
+                int i;
+
+                store = gtk_list_store_new (1, G_TYPE_STRING);
+
+                names = gr_unit_get_names ();
+                for (i = 0; names[i]; i++) {
+                        gtk_list_store_insert_with_values (store, NULL, -1,
+                                                           0, names[i],
+                                                           -1);
+                }
+        }
+
+        model = gtk_tree_model_filter_new (GTK_TREE_MODEL (store), NULL);
+        types[0] = G_TYPE_STRING;
+        gtk_tree_model_filter_set_modify_func (GTK_TREE_MODEL_FILTER (model),
+                                               G_N_ELEMENTS (types),
+                                               types,
+                                               prepend_amount,
+                                               row,
+                                               NULL);
+
+        return model;
+}
+
 static void
 gr_ingredients_viewer_row_init (GrIngredientsViewerRow *self)
 {
+        g_autoptr(GtkEntryCompletion) completion = NULL;
+        g_autoptr(GtkTreeModel) ingredients_model = NULL;
+        g_autoptr(GtkTreeModel) units_model = NULL;
+
         gtk_widget_set_has_window (GTK_WIDGET (self), FALSE);
         gtk_widget_init_template (GTK_WIDGET (self));
 
@@ -441,4 +530,16 @@ gr_ingredients_viewer_row_init (GrIngredientsViewerRow *self)
 
         gtk_drag_dest_set (GTK_WIDGET (self), GTK_DEST_DEFAULT_ALL, entries, 1, GDK_ACTION_MOVE);
         g_signal_connect (self, "drag-data-received", G_CALLBACK (drag_data_received), NULL);
+
+        ingredients_model = get_ingredients_model ();
+        completion = gtk_entry_completion_new ();
+        gtk_entry_completion_set_model (completion, ingredients_model);
+        gtk_entry_completion_set_text_column (completion, 0);
+        gtk_entry_set_completion (GTK_ENTRY (self->ingredient_entry), completion);
+
+        units_model = get_units_model (self);
+        completion = gtk_entry_completion_new ();
+        gtk_entry_completion_set_model (completion, units_model);
+        gtk_entry_completion_set_text_column (completion, 0);
+        gtk_entry_set_completion (GTK_ENTRY (self->unit_entry), completion);
 }