Undo: make weight-deletion an undoable action

This one is a bit more complicated than weight adding, because the
multiple-dive case is not well defined. If multiple dives are selected,
this implementation will search for weights that are identical to the
weight deleted in the currently shown dive. The position of the weight
in the list is ignored.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

2 files changed, 15 insertions, 2 deletions

diff --git a/core/equipment.c b/core/equipment.c
index 39505a39d..bd1a0b4e3 100644
--- a/core/equipment.c
+++ b/core/equipment.c
@@ -111,12 +111,24 @@ void add_weightsystem_description(const weightsystem_t *weightsystem)
 	}
 }
 
+weightsystem_t clone_weightsystem(weightsystem_t ws)
+{
+	weightsystem_t res = { ws.weight, copy_string(ws.description) };
+	return res;
+}
+
 /* Add a clone of a weightsystem to the end of a weightsystem table.
  * Cloned in means that the description-string is copied. */
 void add_cloned_weightsystem(struct weightsystem_table *t, weightsystem_t ws)
 {
-	weightsystem_t w_clone = { ws.weight, copy_string(ws.description) };
-	add_to_weightsystem_table(t, t->nr, w_clone);
+	add_to_weightsystem_table(t, t->nr, clone_weightsystem(ws));
+}
+
+/* Add a clone of a weightsystem to the end of a weightsystem table.
+ * Cloned in means that the description-string is copied. */
+void add_cloned_weightsystem_at(struct weightsystem_table *t, weightsystem_t ws)
+{
+	add_to_weightsystem_table(t, t->nr, clone_weightsystem(ws));
 }
 
 /* Add a clone of a cylinder to the end of a cylinder table.
diff --git a/core/equipment.h b/core/equipment.h
index 86e23f9f8..687e794a5 100644
--- a/core/equipment.h
+++ b/core/equipment.h
@@ -67,6 +67,7 @@ struct weightsystem_table {
 
 extern int cylinderuse_from_text(const char *text);
 extern void copy_weights(const struct weightsystem_table *s, struct weightsystem_table *d);
+extern weightsystem_t clone_weightsystem(weightsystem_t ws);
 extern void copy_cylinder_types(const struct dive *s, struct dive *d);
 extern void add_cloned_weightsystem(struct weightsystem_table *t, weightsystem_t ws);
 extern cylinder_t *add_empty_cylinder(struct cylinder_table *t);