package forget ?package package ...?
Removes all information about each specified package from this interpreter, including information provided by both package ifneeded and package provide.
See also:
RS 2004-02-05: package forget does not remove resources that a package has brought with it. I'm not sure whether it unloads a DLL (8.5 will have unload), but I could verify that it does not remove namespaces created by a package. Now if a package is well-behaved (i.e. creates a single namespace named like itself, in which all variables, commands, and possible child namespaces go), the cleanup could be done with
namespace delete ::pkgName
Unloading could be combined with this:
namespace eval ::pkgName {
set unload {}
trace var ::pkgName::unload u {unload pkgName[info sharedlib] ;#}
}Is that so?
schlenk 2004-02-05: Sorry to say that, but that is only the case for simple packages. Interestingly binary packages are probably a bit better at cleanup, as Tcl_CreateObjCmd has a delete callback slot, so if the command gets deleted by the namespace delete, it would have a chance to cleanup afterwards.
Only if the package author has some precautions in place, like this:
namespace eval ::foo {
variable cleanup 0
proc cleanup {} {
# do cleanup
}
trace add variable ::foo::cleanup unset ::foo::cleanup
}This is kind of a hack to detect namespace deletion, but it actually works (which surprised me, since the doc for unset traces says the var is already gone, so i assumed the namespace was already gone too).