#$Id: package.xotcl,v 1.7 2006/09/27 08:12:40 neumann Exp $
package provide xotcl::package 0.91

package require xotcl::mixinStrategy
package require XOTcl 1

rename package tcl_package

namespace eval ::xotcl::package {
    namespace import ::xotcl::*

    @ @File {description {
	Represent Tcl package loading command by an XOTcl
	object. Enables tracking, tracing, and verbose output
	of package loading
    }
    }
    @ Object package {
	description {
	    Supports all Tcl package options plus present and verbose.
	}
    }
    @ package proc present {args "packageName or -exact packageName"} {
	description {
	    Check whether a package is present or not. Similar to Tcl's 
	    package present, but works with Tcl < 8.3
	}
    }
    @ package proc verbose {v  "1 or 0"} {
	description {
	    Toggle verbose output on/off. If on, package prints the locations
	    from where packages are loaded to the screen. Default is off.
	}
    } 

    Object package
    package set component .
    package set verbose 0
    package proc unknown args {
      #puts stderr "unknown: package $args"
      namespace eval :: tcl_package $args
    }
    package proc verbose value {
	my set verbose $value
    }
    package proc present args {
	if {$::tcl_version<8.3} {
	    my instvar loaded
	    switch -exact -- [lindex $args 0] {
		-exact  {set pkg [lindex $args 1]}
		default {set pkg [lindex $args 0]}
	    }
	    if {[info exists loaded($pkg)]} {
		return $loaded($pkg)
	    } else {
		error "not found"
	    }
	} else {
	  namespace eval :: tcl_package present $args
	}
    }

    package proc require args {
	my instvar component verbose uses loaded
	set prevComponent $component
	if {[catch {set v [eval package present $args]} msg]} {
	    #puts stderr "we have to load $msg"
	    switch -exact -- [lindex $args 0] {
		-exact  {set pkg [lindex $args 1]}
		default {set pkg [lindex $args 0]}
	    }
	    set component $pkg
	    lappend uses($prevComponent) $component
	    set v [namespace eval :: tcl_package require $args]
	    if {$v ne "" && $verbose} {
		set path [lindex [tcl_package ifneeded $pkg $v] 1]
		puts "... $pkg $v loaded from '$path'"
		set loaded($pkg) $v   ;# loaded stuff needed for Tcl 8.0
	    }
	}
	set component $prevComponent
	return $v
    }

    Object package::tracker
    package::tracker set verbose 0
    package::tracker proc storeEntry {table index} {
	my instvar verbose $table
	set ${table}($index) "[package set component] [info script]"
	if {$verbose} {
	    puts  "... $table $index loaded from [info script]"
	}
    }
    package::tracker proc dump {} {
	my instvar class object instproc proc
	if {[info exist class]}    { parray class }
	if {[info exist object]}   { parray object }
	if {[info exist instproc]} { parray instproc }
	if {[info exist proc]}     { parray proc }
    }
    package::tracker proc start {} {
	::Class  add mixin [self]::M
	::Object add mixin [self]::M
    }

    Class package::tracker::M
    package::tracker::M instproc create {cls args} {
	set table [string tolower [string trimleft [self] :]]
	package::tracker storeEntry $table [lindex $args 0]
	next
	$cls add mixin [self class]
    }
    package::tracker::M instproc instproc args {
	package::tracker storeEntry instproc [self]->[lindex $args 0]
	next
    }
    package::tracker::M instproc proc args {
					    package::tracker storeEntry proc [self]->[lindex $args 0]
					    next
					}

    #package::tracker set verbose 1
    #package::tracker start
    #
    #Class A
    #A instproc p args {
    #    puts A
    #}
    #A proc pp args {
    #    a call 
    #}
    #Object o
    #o proc ppp args {
    #    another call
    #}
    #puts stderr ====================================================
    #package::tracker dump

    #puts stderr AUTO_PATH=$auto_path.

    namespace export package
    namespace eval package {
	namespace export tracker
	namespace eval tracker {
	    namespace export M
	}
    }
}

namespace import ::xotcl::package::*
namespace eval package {
    namespace import ::xotcl::package::package::*
    namespace eval tracker {
	namespace import ::xotcl::package::package::tracker::*
    }
}