+static void nr_data_func(GtkTreeViewColumn *col,
+ GtkCellRenderer *renderer,
+ GtkTreeModel *model,
+ GtkTreeIter *iter,
+ gpointer data)
+{
+ int idx, nr;
+ char buffer[40];
+
+ gtk_tree_model_get(model, iter, DIVE_INDEX, &idx, DIVE_NR, &nr, -1);
+ if (idx < 0)
+ *buffer = '\0';
+ else
+ snprintf(buffer, sizeof(buffer), "%d", nr);
+ g_object_set(renderer, "text", buffer, NULL);
+}
+
+/*
+ * Get "maximal" dive gas for a dive.
+ * Rules:
+ * - Trimix trumps nitrox (highest He wins, O2 breaks ties)
+ * - Nitrox trumps air (even if hypoxic)
+ * These are the same rules as the inter-dive sorting rules.
+ */
+static void get_dive_gas(struct dive *dive, int *o2_p, int *he_p, int *o2low_p)
+{
+ int i;
+ int maxo2 = -1, maxhe = -1, mino2 = 1000;
+
+ for (i = 0; i < MAX_CYLINDERS; i++) {
+ cylinder_t *cyl = dive->cylinder + i;
+ struct gasmix *mix = &cyl->gasmix;
+ int o2 = mix->o2.permille;
+ int he = mix->he.permille;
+
+ if (cylinder_none(cyl))
+ continue;
+ if (!o2)
+ o2 = AIR_PERMILLE;
+ if (o2 < mino2)
+ mino2 = o2;
+ if (he > maxhe)
+ goto newmax;
+ if (he < maxhe)
+ continue;
+ if (o2 <= maxo2)
+ continue;
+newmax:
+ maxhe = he;
+ maxo2 = o2;
+ }
+ /* All air? Show/sort as "air"/zero */
+ if (!maxhe && maxo2 == AIR_PERMILLE && mino2 == maxo2)
+ maxo2 = mino2 = 0;
+ *o2_p = maxo2;
+ *he_p = maxhe;
+ *o2low_p = mino2;
+}
+
+static gint nitrox_sort_func(GtkTreeModel *model,
+ GtkTreeIter *iter_a,
+ GtkTreeIter *iter_b,
+ gpointer user_data)
+{
+ int index_a, index_b;
+ struct dive *a, *b;
+ int a_o2, b_o2;
+ int a_he, b_he;
+ int a_o2low, b_o2low;
+
+ gtk_tree_model_get(model, iter_a, DIVE_INDEX, &index_a, -1);
+ gtk_tree_model_get(model, iter_b, DIVE_INDEX, &index_b, -1);
+ a = get_dive(index_a);
+ b = get_dive(index_b);
+ get_dive_gas(a, &a_o2, &a_he, &a_o2low);
+ get_dive_gas(b, &b_o2, &b_he, &b_o2low);
+
+ /* Sort by Helium first, O2 second */
+ if (a_he == b_he) {
+ if (a_o2 == b_o2)
+ return a_o2low - b_o2low;
+ return a_o2 - b_o2;
+ }
+ return a_he - b_he;
+}
+
+#define UTF8_ELLIPSIS "\xE2\x80\xA6"
+