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|
# package.tcl --
#
# utility procs formerly in init.tcl which can be loaded on demand
# for package management.
#
# RCS: @(#) $Id: package.tcl,v 1.1.2.6 1999/04/01 23:21:33 welch Exp $
#
# Copyright (c) 1991-1993 The Regents of the University of California.
# Copyright (c) 1994-1998 Sun Microsystems, Inc.
#
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
#
# pkg_compareExtension --
#
# Used internally by pkg_mkIndex to compare the extension of a file to
# a given extension. On Windows, it uses a case-insensitive comparison
# because the file system can be file insensitive.
#
# Arguments:
# fileName name of a file whose extension is compared
# ext (optional) The extension to compare against; you must
# provide the starting dot.
# Defaults to [info sharedlibextension]
#
# Results:
# Returns 1 if the extension matches, 0 otherwise
proc pkg_compareExtension { fileName {ext {}} } {
global tcl_platform
if {[string length $ext] == 0} {
set ext [info sharedlibextension]
}
if {[string compare $tcl_platform(platform) "windows"] == 0} {
return [expr {[string compare \
[string tolower [file extension $fileName]] \
[string tolower $ext]] == 0}]
} else {
return [expr {[string compare [file extension $fileName] $ext] == 0}]
}
}
# pkg_mkIndex --
# This procedure creates a package index in a given directory. The
# package index consists of a "pkgIndex.tcl" file whose contents are
# a Tcl script that sets up package information with "package require"
# commands. The commands describe all of the packages defined by the
# files given as arguments.
#
# Arguments:
# -direct (optional) If this flag is present, the generated
# code in pkgMkIndex.tcl will cause the package to be
# loaded when "package require" is executed, rather
# than lazily when the first reference to an exported
# procedure in the package is made.
# -verbose (optional) Verbose output; the name of each file that
# was successfully rocessed is printed out. Additionally,
# if processing of a file failed a message is printed.
# -load pat (optional) Preload any packages whose names match
# the pattern. Used to handle DLLs that depend on
# other packages during their Init procedure.
# dir - Name of the directory in which to create the index.
# args - Any number of additional arguments, each giving
# a glob pattern that matches the names of one or
# more shared libraries or Tcl script files in
# dir.
proc pkg_mkIndex {args} {
global errorCode errorInfo
set usage {"pkg_mkIndex ?-direct? ?-verbose? ?-load pattern? ?--? dir ?pattern ...?"};
set argCount [llength $args]
if {$argCount < 1} {
return -code error "wrong # args: should be\n$usage"
}
set more ""
set direct 0
set doVerbose 0
set loadPat ""
for {set idx 0} {$idx < $argCount} {incr idx} {
set flag [lindex $args $idx]
switch -glob -- $flag {
-- {
# done with the flags
incr idx
break
}
-verbose {
set doVerbose 1
}
-direct {
set direct 1
append more " -direct"
}
-load {
incr idx
set loadPat [lindex $args $idx]
append more " -load $loadPat"
}
-* {
return -code error "unknown flag $flag: should be\n$usage"
}
default {
# done with the flags
break
}
}
}
set dir [lindex $args $idx]
set patternList [lrange $args [expr {$idx + 1}] end]
if {[llength $patternList] == 0} {
set patternList [list "*.tcl" "*[info sharedlibextension]"]
}
append index "# Tcl package index file, version 1.1\n"
append index "# This file is generated by the \"pkg_mkIndex$more\" command\n"
append index "# and sourced either when an application starts up or\n"
append index "# by a \"package unknown\" script. It invokes the\n"
append index "# \"package ifneeded\" command to set up package-related\n"
append index "# information so that packages will be loaded automatically\n"
append index "# in response to \"package require\" commands. When this\n"
append index "# script is sourced, the variable \$dir must contain the\n"
append index "# full path name of this file's directory.\n"
set oldDir [pwd]
cd $dir
if {[catch {eval glob $patternList} fileList]} {
global errorCode errorInfo
cd $oldDir
return -code error -errorcode $errorCode -errorinfo $errorInfo $fileList
}
foreach file $fileList {
# For each file, figure out what commands and packages it provides.
# To do this, create a child interpreter, load the file into the
# interpreter, and get a list of the new commands and packages
# that are defined.
if {[string compare $file "pkgIndex.tcl"] == 0} {
continue
}
# Changed back to the original directory before initializing the
# slave in case TCL_LIBRARY is a relative path (e.g. in the test
# suite).
cd $oldDir
set c [interp create]
# Load into the child any packages currently loaded in the parent
# interpreter that match the -load pattern.
foreach pkg [info loaded] {
if {! [string match $loadPat [lindex $pkg 1]]} {
continue
}
if {[lindex $pkg 1] == "Tk"} {
$c eval {set argv {-geometry +0+0}}
}
if {[catch {
load [lindex $pkg 0] [lindex $pkg 1] $c
} err]} {
if {$doVerbose} {
tclLog "warning: load [lindex $pkg 0] [lindex $pkg 1]\nfailed with: $err"
}
} else {
if {$doVerbose} {
tclLog "loaded [lindex $pkg 0] [lindex $pkg 1]"
}
}
}
cd $dir
$c eval {
# Stub out the package command so packages can
# require other packages.
rename package __package_orig
proc package {what args} {
switch -- $what {
require { return ; # ignore transitive requires }
default { eval __package_orig {$what} $args }
}
}
proc tclPkgUnknown args {}
package unknown tclPkgUnknown
# Stub out the unknown command so package can call
# into each other during their initialilzation.
proc unknown {args} {}
# Stub out the auto_import mechanism
proc auto_import {args} {}
# reserve the ::tcl namespace for support procs
# and temporary variables. This might make it awkward
# to generate a pkgIndex.tcl file for the ::tcl namespace.
namespace eval ::tcl {
variable file ;# Current file being processed
variable direct ;# -direct flag value
variable x ;# Loop variable
variable debug ;# For debugging
variable type ;# "load" or "source", for -direct
variable namespaces ;# Existing namespaces (e.g., ::tcl)
variable packages ;# Existing packages (e.g., Tcl)
variable origCmds ;# Existing commands
variable newCmds ;# Newly created commands
variable newPkgs {} ;# Newly created packages
}
}
$c eval [list set ::tcl::file $file]
$c eval [list set ::tcl::direct $direct]
# Download needed procedures into the slave because we've
# just deleted the unknown procedure. This doesn't handle
# procedures with default arguments.
foreach p {pkg_compareExtension} {
$c eval [list proc $p [info args $p] [info body $p]]
}
if {[catch {
$c eval {
set ::tcl::debug "loading or sourcing"
# we need to track command defined by each package even in
# the -direct case, because they are needed internally by
# the "partial pkgIndex.tcl" step above.
proc ::tcl::GetAllNamespaces {{root ::}} {
set list $root
foreach ns [namespace children $root] {
eval lappend list [::tcl::GetAllNamespaces $ns]
}
return $list
}
# initialize the list of existing namespaces, packages, commands
foreach ::tcl::x [::tcl::GetAllNamespaces] {
set ::tcl::namespaces($::tcl::x) 1
}
foreach ::tcl::x [package names] {
set ::tcl::packages($::tcl::x) 1
}
set ::tcl::origCmds [info commands]
# Try to load the file if it has the shared library
# extension, otherwise source it. It's important not to
# try to load files that aren't shared libraries, because
# on some systems (like SunOS) the loader will abort the
# whole application when it gets an error.
if {[pkg_compareExtension $::tcl::file [info sharedlibextension]]} {
# The "file join ." command below is necessary.
# Without it, if the file name has no \'s and we're
# on UNIX, the load command will invoke the
# LD_LIBRARY_PATH search mechanism, which could cause
# the wrong file to be used.
set ::tcl::debug loading
load [file join . $::tcl::file]
set ::tcl::type load
} else {
set ::tcl::debug sourcing
source $::tcl::file
set ::tcl::type source
}
# See what new namespaces appeared, and import commands
# from them. Only exported commands go into the index.
foreach ::tcl::x [::tcl::GetAllNamespaces] {
if {! [info exists ::tcl::namespaces($::tcl::x)]} {
namespace import -force ${::tcl::x}::*
}
}
# Figure out what commands appeared
foreach ::tcl::x [info commands] {
set ::tcl::newCmds($::tcl::x) 1
}
foreach ::tcl::x $::tcl::origCmds {
catch {unset ::tcl::newCmds($::tcl::x)}
}
foreach ::tcl::x [array names ::tcl::newCmds] {
# reverse engineer which namespace a command comes from
set ::tcl::abs [namespace origin $::tcl::x]
# special case so that global names have no leading
# ::, this is required by the unknown command
set ::tcl::abs [auto_qualify $::tcl::abs ::]
if {[string compare $::tcl::x $::tcl::abs] != 0} {
# Name changed during qualification
set ::tcl::newCmds($::tcl::abs) 1
unset ::tcl::newCmds($::tcl::x)
}
}
# Look through the packages that appeared, and if there is
# a version provided, then record it
foreach ::tcl::x [package names] {
if {([string compare [package provide $::tcl::x] ""] != 0) \
&& ![info exists ::tcl::packages($::tcl::x)]} {
lappend ::tcl::newPkgs \
[list $::tcl::x [package provide $::tcl::x]]
}
}
}
} msg] == 1} {
set what [$c eval set ::tcl::debug]
if {$doVerbose} {
tclLog "warning: error while $what $file: $msg"
}
} else {
set type [$c eval set ::tcl::type]
set cmds [lsort [$c eval array names ::tcl::newCmds]]
set pkgs [$c eval set ::tcl::newPkgs]
if {[llength $pkgs] > 1} {
tclLog "warning: \"$file\" provides more than one package ($pkgs)"
}
foreach pkg $pkgs {
# cmds is empty/not used in the direct case
lappend files($pkg) [list $file $type $cmds]
}
if {$doVerbose} {
tclLog "processed $file"
}
interp delete $c
}
}
foreach pkg [lsort [array names files]] {
append index "\npackage ifneeded $pkg "
if {$direct} {
set cmdList {}
foreach elem $files($pkg) {
set file [lindex $elem 0]
set type [lindex $elem 1]
lappend cmdList "\[list $type \[file join \$dir\
[list $file]\]\]"
}
append index [join $cmdList "\\n"]
} else {
append index "\[list tclPkgSetup \$dir [lrange $pkg 0 0]\
[lrange $pkg 1 1] [list $files($pkg)]\]"
}
}
set f [open pkgIndex.tcl w]
puts $f $index
close $f
cd $oldDir
}
# tclPkgSetup --
# This is a utility procedure use by pkgIndex.tcl files. It is invoked
# as part of a "package ifneeded" script. It calls "package provide"
# to indicate that a package is available, then sets entries in the
# auto_index array so that the package's files will be auto-loaded when
# the commands are used.
#
# Arguments:
# dir - Directory containing all the files for this package.
# pkg - Name of the package (no version number).
# version - Version number for the package, such as 2.1.3.
# files - List of files that constitute the package. Each
# element is a sub-list with three elements. The first
# is the name of a file relative to $dir, the second is
# "load" or "source", indicating whether the file is a
# loadable binary or a script to source, and the third
# is a list of commands defined by this file.
proc tclPkgSetup {dir pkg version files} {
global auto_index
package provide $pkg $version
foreach fileInfo $files {
set f [lindex $fileInfo 0]
set type [lindex $fileInfo 1]
foreach cmd [lindex $fileInfo 2] {
if {$type == "load"} {
set auto_index($cmd) [list load [file join $dir $f] $pkg]
} else {
set auto_index($cmd) [list source [file join $dir $f]]
}
}
}
}
# tclMacPkgSearch --
# The procedure is used on the Macintosh to search a given directory for files
# with a TEXT resource named "pkgIndex". If it exists it is sourced in to the
# interpreter to setup the package database.
proc tclMacPkgSearch {dir} {
foreach x [glob -nocomplain [file join $dir *.shlb]] {
if {[file isfile $x]} {
set res [resource open $x]
foreach y [resource list TEXT $res] {
if {$y == "pkgIndex"} {source -rsrc pkgIndex}
}
catch {resource close $res}
}
}
}
# tclPkgUnknown --
# This procedure provides the default for the "package unknown" function.
# It is invoked when a package that's needed can't be found. It scans
# the auto_path directories and their immediate children looking for
# pkgIndex.tcl files and sources any such files that are found to setup
# the package database. (On the Macintosh we also search for pkgIndex
# TEXT resources in all files.)
#
# Arguments:
# name - Name of desired package. Not used.
# version - Version of desired package. Not used.
# exact - Either "-exact" or omitted. Not used.
proc tclPkgUnknown {name version {exact {}}} {
global auto_path tcl_platform env
if {![info exists auto_path]} {
return
}
for {set i [expr {[llength $auto_path] - 1}]} {$i >= 0} {incr i -1} {
# we can't use glob in safe interps, so enclose the following
# in a catch statement
catch {
foreach file [glob -nocomplain [file join [lindex $auto_path $i] \
* pkgIndex.tcl]] {
set dir [file dirname $file]
if {[catch {source $file} msg]} {
tclLog "error reading package index file $file: $msg"
}
}
}
set dir [lindex $auto_path $i]
set file [file join $dir pkgIndex.tcl]
# safe interps usually don't have "file readable", nor stderr channel
if {[interp issafe] || [file readable $file]} {
if {[catch {source $file} msg] && ![interp issafe]} {
tclLog "error reading package index file $file: $msg"
}
}
# On the Macintosh we also look in the resource fork
# of shared libraries
# We can't use tclMacPkgSearch in safe interps because it uses glob
if {(![interp issafe]) && ($tcl_platform(platform) == "macintosh")} {
set dir [lindex $auto_path $i]
tclMacPkgSearch $dir
foreach x [glob -nocomplain [file join $dir *]] {
if {[file isdirectory $x]} {
set dir $x
tclMacPkgSearch $dir
}
}
}
}
}
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