Implement dependents check in drop command

Also, add support for commands to return program status.

1 files changed, 1 insertions, 1 deletions

diff --git a/bpkg/help b/bpkg/help
index 9c81e7e..8bd5596 100644
--- a/bpkg/help
+++ b/bpkg/help
@@ -12,7 +12,7 @@
 
 namespace bpkg
 {
-  void
+  int
   help (const help_options&,
         const string& topic,
         void (*usage) (std::ostream&));