Undo: make weight editing undoable

Implement the EditWeight undo command. Since there is common code
(storage of the old weight), this creates a common base class for
RemoveWeight and EditWeight. The model calls directly into the undo
command, which is somewhat unfortunate as it feels like a layering
violation. It's the easy thing to do for now.

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

1 files changed, 9 insertions, 0 deletions

diff --git a/core/equipment.c b/core/equipment.c
index e7ac327fd..07e468c1c 100644
--- a/core/equipment.c
+++ b/core/equipment.c
@@ -288,6 +288,15 @@ void remove_weightsystem(struct dive *dive, int idx)
 	remove_from_weightsystem_table(&dive->weightsystems, idx);
 }
 
+// ws is cloned.
+void set_weightsystem(struct dive *dive, int idx, weightsystem_t ws)
+{
+	if (idx < 0 || idx >= dive->weightsystems.nr)
+		return;
+	free_weightsystem(dive->weightsystems.weightsystems[idx]);
+	dive->weightsystems.weightsystems[idx] = clone_weightsystem(ws);
+}
+
 /* when planning a dive we need to make sure that all cylinders have a sane depth assigned
  * and if we are tracking gas consumption the pressures need to be reset to start = end = workingpressure */
 void reset_cylinders(struct dive *dive, bool track_gas)