Practical Programming in Tcl & Tk, Third Edition

Introspection

The info commands operation returns all the commands that are currently visible. It is described in more detail on page 179. You can limit the information returned with a string match pattern. You can also include a namespace specifier in the pattern to see what is visible in a namespace. Remember that global commands and imported commands are visible, so info commands returns more than just what is defined by the namespace. Example 14-5 uses namespace origin, which returns the original name of imported commands, to sort out the commands that are really defined in a namespace:

Example 14-5 Listing commands defined by a namespace.

proc Namespace_List {{namespace {}}} { if {[string length $namespace] == 0} { # Determine the namespace ...