Re: [PATCH v3 5/5] commit: refuse partial commits during conflict resolution

"Elijah Newren via GitGitGadget" [off-list ref] writes:

-	if (whence != FROM_COMMIT) {
-		if (whence == FROM_MERGE)
-			die(_("cannot do a partial commit during a merge."));
-		else if (is_from_cherry_pick(whence))
-			die(_("cannot do a partial commit during a cherry-pick."));
+	switch (sequencer_ongoing_operation(the_repository, whence)) {
+	case ONGOING_NONE:
+		break;
+	case ONGOING_MERGE:
+		die(_("cannot do a partial commit during a merge."));
+	case ONGOING_CHERRY_PICK:
+		die(_("cannot do a partial commit during a cherry-pick."));
+	case ONGOING_REBASE_EMPTY:
+		/*
+		 * A pick that became empty is not a conflict, and creating
+		 * a new commit (partial or not) poses no problem.
+		 */
+		break;
+	case ONGOING_REVERT:
+		die(_("cannot do a partial commit during a revert."));
+	case ONGOING_AM:
+		die(_("cannot do a partial commit during an am session."));
+	case ONGOING_REBASE_CONFLICT:
+		die(_("cannot do a partial commit while resolving conflicts during a rebase."));
 	}

Looks quite thorough.  
Deliberate ommission of "default:" is a plus ;-)