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, 25 insertions, 0 deletions

diff --git a/desktop-widgets/command_divesite.cpp b/desktop-widgets/command_divesite.cpp
index a5dce00d1..3b35ddcc2 100644
--- a/desktop-widgets/command_divesite.cpp
+++ b/desktop-widgets/command_divesite.cpp
@@ -105,6 +105,31 @@ void DeleteDiveSites::undo()
 	sitesToRemove = std::move(addDiveSites(sitesToAdd));
 }
 
+PurgeUnusedDiveSites::PurgeUnusedDiveSites()
+{
+	setText(tr("purge unused dive sites"));
+	for (int i = 0; i < dive_site_table.nr; ++i) {
+		dive_site *ds = dive_site_table.dive_sites[i];
+		if (ds->dives.nr == 0)
+			sitesToRemove.push_back(ds);
+	}
+}
+
+bool PurgeUnusedDiveSites::workToBeDone()
+{
+	return !sitesToRemove.empty();
+}
+
+void PurgeUnusedDiveSites::redo()
+{
+	sitesToAdd = std::move(removeDiveSites(sitesToRemove));
+}
+
+void PurgeUnusedDiveSites::undo()
+{
+	sitesToRemove = std::move(addDiveSites(sitesToAdd));
+}
+
 // Helper function: swap C and Qt string
 static void swap(char *&c, QString &q)
 {