Dive site: implement purge of unused dive sites

Add a "purge unused dive sites" button to the dive site list.
Connect it to a new PurgeUnusedDiveSites command. Implementation
was trivial: simply copy the DeleteDiveSites command.

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

1 files changed, 15 insertions, 0 deletions

diff --git a/desktop-widgets/command_divesite.h b/desktop-widgets/command_divesite.h
index 58b3aabf5..9661bbffd 100644
--- a/desktop-widgets/command_divesite.h
+++ b/desktop-widgets/command_divesite.h
@@ -43,6 +43,21 @@ private:
 	std::vector<OwningDiveSitePtr> sitesToAdd;
 };
 
+class PurgeUnusedDiveSites : public Base {
+public:
+	PurgeUnusedDiveSites();
+private:
+	bool workToBeDone() override;
+	void undo() override;
+	void redo() override;
+
+	// For redo
+	std::vector<dive_site *> sitesToRemove;
+
+	// For undo
+	std::vector<OwningDiveSitePtr> sitesToAdd;
+};
+
 class EditDiveSiteName : public Base {
 public:
 	EditDiveSiteName(dive_site *ds, const QString &name);