Introspection

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	Practical Programming in Tcl & Tk, Third Edition By Brent B. Welch
	Table of Contents
	Chapter 14.  Namespaces

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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 of our caller       set namespace [uplevel {namespace current}]    }    set result {}    foreach cmd [info commands ${namespace}::*] {       if {[namespace origin $cmd] == $cmd} {          lappend result $cmd       }    }    return [lsort $result] } 

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