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# init.tcl --
#
# Default system startup file for Tcl-based applications. Defines
# "unknown" procedure and auto-load facilities.
#
# RCS: @(#) $Id: init.tcl,v 1.55.2.6 2005/07/22 21:59:40 dgp Exp $
#
# Copyright (c) 1991-1993 The Regents of the University of California.
# Copyright (c) 1994-1996 Sun Microsystems, Inc.
# Copyright (c) 1998-1999 Scriptics Corporation.
#
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
#
if {[info commands package] == ""} {
error "version mismatch: library\nscripts expect Tcl version 7.5b1 or later but the loaded version is\nonly [info patchlevel]"
}
package require -exact Tcl 8.4
# Compute the auto path to use in this interpreter.
# The values on the path come from several locations:
#
# The environment variable TCLLIBPATH
#
# tcl_library, which is the directory containing this init.tcl script.
# tclInitScript.h searches around for the directory containing this
# init.tcl and defines tcl_library to that location before sourcing it.
#
# The parent directory of tcl_library. Adding the parent
# means that packages in peer directories will be found automatically.
#
# Also add the directory ../lib relative to the directory where the
# executable is located. This is meant to find binary packages for the
# same architecture as the current executable.
#
# tcl_pkgPath, which is set by the platform-specific initialization routines
# On UNIX it is compiled in
# On Windows, it is not used
# On Macintosh it is "Tool Command Language" in the Extensions folder
if {![info exists auto_path]} {
if {[info exists env(TCLLIBPATH)]} {
set auto_path $env(TCLLIBPATH)
} else {
set auto_path ""
}
}
namespace eval tcl {
variable Dir
if {[info library] ne ""} {
foreach Dir [list [info library] [file dirname [info library]]] {
if {[lsearch -exact $::auto_path $Dir] < 0} {
lappend ::auto_path $Dir
}
}
}
if {[info exists ::tcl_pkgPath]} {
foreach Dir $::tcl_pkgPath {
if {[lsearch -exact $::auto_path $Dir] < 0} {
lappend ::auto_path $Dir
}
}
}
}
# Windows specific end of initialization
if {(![interp issafe]) && $tcl_platform(platform) eq "windows"} {
namespace eval tcl {
proc EnvTraceProc {lo n1 n2 op} {
set x $::env($n2)
set ::env($lo) $x
set ::env([string toupper $lo]) $x
}
proc InitWinEnv {} {
global env tcl_platform
foreach p [array names env] {
set u [string toupper $p]
if {$u ne $p} {
switch -- $u {
COMSPEC -
PATH {
if {![info exists env($u)]} {
set env($u) $env($p)
}
trace add variable env($p) write \
[namespace code [list EnvTraceProc $p]]
trace add variable env($u) write \
[namespace code [list EnvTraceProc $p]]
}
}
}
}
if {![info exists env(COMSPEC)]} {
if {$tcl_platform(os) eq "Windows NT"} {
set env(COMSPEC) cmd.exe
} else {
set env(COMSPEC) command.com
}
}
}
InitWinEnv
}
}
# Setup the unknown package handler
package unknown tclPkgUnknown
if {![interp issafe]} {
# setup platform specific unknown package handlers
if {$::tcl_platform(platform) eq "unix"
&& $::tcl_platform(os) eq "Darwin"} {
package unknown [list tcl::MacOSXPkgUnknown [package unknown]]
}
if {$::tcl_platform(platform) eq "macintosh"} {
package unknown [list tcl::MacPkgUnknown [package unknown]]
}
}
# Conditionalize for presence of exec.
if {[namespace which -command exec] eq ""} {
# Some machines, such as the Macintosh, do not have exec. Also, on all
# platforms, safe interpreters do not have exec.
set auto_noexec 1
}
set errorCode ""
set errorInfo ""
# Define a log command (which can be overwitten to log errors
# differently, specially when stderr is not available)
if {[namespace which -command tclLog] eq ""} {
proc tclLog {string} {
catch {puts stderr $string}
}
}
# unknown --
# This procedure is called when a Tcl command is invoked that doesn't
# exist in the interpreter. It takes the following steps to make the
# command available:
#
# 1. See if the command has the form "namespace inscope ns cmd" and
# if so, concatenate its arguments onto the end and evaluate it.
# 2. See if the autoload facility can locate the command in a
# Tcl script file. If so, load it and execute it.
# 3. If the command was invoked interactively at top-level:
# (a) see if the command exists as an executable UNIX program.
# If so, "exec" the command.
# (b) see if the command requests csh-like history substitution
# in one of the common forms !!, !<number>, or ^old^new. If
# so, emulate csh's history substitution.
# (c) see if the command is a unique abbreviation for another
# command. If so, invoke the command.
#
# Arguments:
# args - A list whose elements are the words of the original
# command, including the command name.
proc unknown args {
global auto_noexec auto_noload env unknown_pending tcl_interactive
global errorCode errorInfo
# If the command word has the form "namespace inscope ns cmd"
# then concatenate its arguments onto the end and evaluate it.
set cmd [lindex $args 0]
if {[regexp "^:*namespace\[ \t\n\]+inscope" $cmd] && [llength $cmd] == 4} {
set arglist [lrange $args 1 end]
set ret [catch {uplevel 1 ::$cmd $arglist} result]
if {$ret == 0} {
return $result
} else {
return -code $ret -errorcode $errorCode $result
}
}
# Save the values of errorCode and errorInfo variables, since they
# may get modified if caught errors occur below. The variables will
# be restored just before re-executing the missing command.
# Safety check in case something unsets the variables
# ::errorInfo or ::errorCode. [Bug 1063707]
if {![info exists errorCode]} {
set errorCode ""
}
if {![info exists errorInfo]} {
set errorInfo ""
}
set savedErrorCode $errorCode
set savedErrorInfo $errorInfo
set name $cmd
if {![info exists auto_noload]} {
#
# Make sure we're not trying to load the same proc twice.
#
if {[info exists unknown_pending($name)]} {
return -code error "self-referential recursion in \"unknown\" for command \"$name\"";
}
set unknown_pending($name) pending;
set ret [catch {auto_load $name [uplevel 1 {::namespace current}]} msg]
unset unknown_pending($name);
if {$ret != 0} {
append errorInfo "\n (autoloading \"$name\")"
return -code $ret -errorcode $errorCode -errorinfo $errorInfo $msg
}
if {![array size unknown_pending]} {
unset unknown_pending
}
if {$msg} {
set errorCode $savedErrorCode
set errorInfo $savedErrorInfo
set code [catch {uplevel 1 $args} msg]
if {$code == 1} {
#
# Compute stack trace contribution from the [uplevel].
# Note the dependence on how Tcl_AddErrorInfo, etc.
# construct the stack trace.
#
set cinfo $args
set ellipsis ""
while {[string bytelength $cinfo] > 150} {
set cinfo [string range $cinfo 0 end-1]
set ellipsis "..."
}
append cinfo $ellipsis "\"\n (\"uplevel\" body line 1)"
append cinfo "\n invoked from within"
append cinfo "\n\"uplevel 1 \$args\""
#
# Try each possible form of the stack trace
# and trim the extra contribution from the matching case
#
set expect "$msg\n while executing\n\"$cinfo"
if {$errorInfo eq $expect} {
#
# The stack has only the eval from the expanded command
# Do not generate any stack trace here.
#
return -code error -errorcode $errorCode $msg
}
#
# Stack trace is nested, trim off just the contribution
# from the extra "eval" of $args due to the "catch" above.
#
set expect "\n invoked from within\n\"$cinfo"
set exlen [string length $expect]
set eilen [string length $errorInfo]
set i [expr {$eilen - $exlen - 1}]
set einfo [string range $errorInfo 0 $i]
#
# For now verify that $errorInfo consists of what we are about
# to return plus what we expected to trim off.
#
if {$errorInfo ne "$einfo$expect"} {
error "Tcl bug: unexpected stack trace in \"unknown\"" {} \
[list CORE UNKNOWN BADTRACE $expect $errorInfo]
}
return -code error -errorcode $errorCode \
-errorinfo $einfo $msg
} else {
return -code $code $msg
}
}
}
if {([info level] == 1) && [info script] eq "" \
&& [info exists tcl_interactive] && $tcl_interactive} {
if {![info exists auto_noexec]} {
set new [auto_execok $name]
if {$new ne ""} {
set errorCode $savedErrorCode
set errorInfo $savedErrorInfo
set redir ""
if {[namespace which -command console] eq ""} {
set redir ">&@stdout <@stdin"
}
return [uplevel 1 exec $redir $new [lrange $args 1 end]]
}
}
set errorCode $savedErrorCode
set errorInfo $savedErrorInfo
if {$name eq "!!"} {
set newcmd [history event]
} elseif {[regexp {^!(.+)$} $name -> event]} {
set newcmd [history event $event]
} elseif {[regexp {^\^([^^]*)\^([^^]*)\^?$} $name -> old new]} {
set newcmd [history event -1]
catch {regsub -all -- $old $newcmd $new newcmd}
}
if {[info exists newcmd]} {
tclLog $newcmd
history change $newcmd 0
return [uplevel 1 $newcmd]
}
set ret [catch {set candidates [info commands $name*]} msg]
if {$name eq "::"} {
set name ""
}
if {$ret != 0} {
return -code $ret -errorcode $errorCode \
"error in unknown while checking if \"$name\" is\
a unique command abbreviation:\n$msg"
}
# Handle empty $name separately due to strangeness in [string first]
if {$name eq ""} {
if {[llength $candidates] != 1} {
return -code error "empty command name \"\""
}
return [uplevel 1 [lreplace $args 0 0 [lindex $candidates 0]]]
}
# Filter out bogus matches when $name contained
# a glob-special char [Bug 946952]
set cmds [list]
foreach x $candidates {
if {[string first $name $x] == 0} {
lappend cmds $x
}
}
if {[llength $cmds] == 1} {
return [uplevel 1 [lreplace $args 0 0 [lindex $cmds 0]]]
}
if {[llength $cmds]} {
return -code error "ambiguous command name \"$name\": [lsort $cmds]"
}
}
return -code error "invalid command name \"$name\""
}
# auto_load --
# Checks a collection of library directories to see if a procedure
# is defined in one of them. If so, it sources the appropriate
# library file to create the procedure. Returns 1 if it successfully
# loaded the procedure, 0 otherwise.
#
# Arguments:
# cmd - Name of the command to find and load.
# namespace (optional) The namespace where the command is being used - must be
# a canonical namespace as returned [namespace current]
# for instance. If not given, namespace current is used.
proc auto_load {cmd {namespace {}}} {
global auto_index auto_oldpath auto_path
if {$namespace eq ""} {
set namespace [uplevel 1 [list ::namespace current]]
}
set nameList [auto_qualify $cmd $namespace]
# workaround non canonical auto_index entries that might be around
# from older auto_mkindex versions
lappend nameList $cmd
foreach name $nameList {
if {[info exists auto_index($name)]} {
namespace eval :: $auto_index($name)
# There's a couple of ways to look for a command of a given
# name. One is to use
# info commands $name
# Unfortunately, if the name has glob-magic chars in it like *
# or [], it may not match. For our purposes here, a better
# route is to use
# namespace which -command $name
if {[namespace which -command $name] ne ""} {
return 1
}
}
}
if {![info exists auto_path]} {
return 0
}
if {![auto_load_index]} {
return 0
}
foreach name $nameList {
if {[info exists auto_index($name)]} {
namespace eval :: $auto_index($name)
if {[namespace which -command $name] ne ""} {
return 1
}
}
}
return 0
}
# auto_load_index --
# Loads the contents of tclIndex files on the auto_path directory
# list. This is usually invoked within auto_load to load the index
# of available commands. Returns 1 if the index is loaded, and 0 if
# the index is already loaded and up to date.
#
# Arguments:
# None.
proc auto_load_index {} {
global auto_index auto_oldpath auto_path errorInfo errorCode
if {[info exists auto_oldpath] && $auto_oldpath eq $auto_path} {
return 0
}
set auto_oldpath $auto_path
# Check if we are a safe interpreter. In that case, we support only
# newer format tclIndex files.
set issafe [interp issafe]
for {set i [expr {[llength $auto_path] - 1}]} {$i >= 0} {incr i -1} {
set dir [lindex $auto_path $i]
set f ""
if {$issafe} {
catch {source [file join $dir tclIndex]}
} elseif {[catch {set f [open [file join $dir tclIndex]]}]} {
continue
} else {
set error [catch {
set id [gets $f]
if {$id eq "# Tcl autoload index file, version 2.0"} {
eval [read $f]
} elseif {$id eq "# Tcl autoload index file: each line identifies a Tcl"} {
while {[gets $f line] >= 0} {
if {[string index $line 0] eq "#"
|| ([llength $line] != 2)} {
continue
}
set name [lindex $line 0]
set auto_index($name) \
"source [file join $dir [lindex $line 1]]"
}
} else {
error "[file join $dir tclIndex] isn't a proper Tcl index file"
}
} msg]
if {$f ne ""} {
close $f
}
if {$error} {
error $msg $errorInfo $errorCode
}
}
}
return 1
}
# auto_qualify --
#
# Compute a fully qualified names list for use in the auto_index array.
# For historical reasons, commands in the global namespace do not have leading
# :: in the index key. The list has two elements when the command name is
# relative (no leading ::) and the namespace is not the global one. Otherwise
# only one name is returned (and searched in the auto_index).
#
# Arguments -
# cmd The command name. Can be any name accepted for command
# invocations (Like "foo::::bar").
# namespace The namespace where the command is being used - must be
# a canonical namespace as returned by [namespace current]
# for instance.
proc auto_qualify {cmd namespace} {
# count separators and clean them up
# (making sure that foo:::::bar will be treated as foo::bar)
set n [regsub -all {::+} $cmd :: cmd]
# Ignore namespace if the name starts with ::
# Handle special case of only leading ::
# Before each return case we give an example of which category it is
# with the following form :
# ( inputCmd, inputNameSpace) -> output
if {[string match ::* $cmd]} {
if {$n > 1} {
# ( ::foo::bar , * ) -> ::foo::bar
return [list $cmd]
} else {
# ( ::global , * ) -> global
return [list [string range $cmd 2 end]]
}
}
# Potentially returning 2 elements to try :
# (if the current namespace is not the global one)
if {$n == 0} {
if {$namespace eq "::"} {
# ( nocolons , :: ) -> nocolons
return [list $cmd]
} else {
# ( nocolons , ::sub ) -> ::sub::nocolons nocolons
return [list ${namespace}::$cmd $cmd]
}
} elseif {$namespace eq "::"} {
# ( foo::bar , :: ) -> ::foo::bar
return [list ::$cmd]
} else {
# ( foo::bar , ::sub ) -> ::sub::foo::bar ::foo::bar
return [list ${namespace}::$cmd ::$cmd]
}
}
# auto_import --
#
# Invoked during "namespace import" to make see if the imported commands
# reside in an autoloaded library. If so, the commands are loaded so
# that they will be available for the import links. If not, then this
# procedure does nothing.
#
# Arguments -
# pattern The pattern of commands being imported (like "foo::*")
# a canonical namespace as returned by [namespace current]
proc auto_import {pattern} {
global auto_index
# If no namespace is specified, this will be an error case
if {![string match *::* $pattern]} {
return
}
set ns [uplevel 1 [list ::namespace current]]
set patternList [auto_qualify $pattern $ns]
auto_load_index
foreach pattern $patternList {
foreach name [array names auto_index $pattern] {
if {([namespace which -command $name] eq "")
&& ([namespace qualifiers $pattern] eq [namespace qualifiers $name])} {
namespace eval :: $auto_index($name)
}
}
}
}
# auto_execok --
#
# Returns string that indicates name of program to execute if
# name corresponds to a shell builtin or an executable in the
# Windows search path, or "" otherwise. Builds an associative
# array auto_execs that caches information about previous checks,
# for speed.
#
# Arguments:
# name - Name of a command.
if {$tcl_platform(platform) eq "windows"} {
# Windows version.
#
# Note that info executable doesn't work under Windows, so we have to
# look for files with .exe, .com, or .bat extensions. Also, the path
# may be in the Path or PATH environment variables, and path
# components are separated with semicolons, not colons as under Unix.
#
proc auto_execok name {
global auto_execs env tcl_platform
if {[info exists auto_execs($name)]} {
return $auto_execs($name)
}
set auto_execs($name) ""
set shellBuiltins [list cls copy date del erase dir echo mkdir \
md rename ren rmdir rd time type ver vol]
if {$tcl_platform(os) eq "Windows NT"} {
# NT includes the 'start' built-in
lappend shellBuiltins "start"
}
if {[info exists env(PATHEXT)]} {
# Add an initial ; to have the {} extension check first.
set execExtensions [split ";$env(PATHEXT)" ";"]
} else {
set execExtensions [list {} .com .exe .bat]
}
if {[lsearch -exact $shellBuiltins $name] != -1} {
# When this is command.com for some reason on Win2K, Tcl won't
# exec it unless the case is right, which this corrects. COMSPEC
# may not point to a real file, so do the check.
set cmd $env(COMSPEC)
if {[file exists $cmd]} {
set cmd [file attributes $cmd -shortname]
}
return [set auto_execs($name) [list $cmd /c $name]]
}
if {[llength [file split $name]] != 1} {
foreach ext $execExtensions {
set file ${name}${ext}
if {[file exists $file] && ![file isdirectory $file]} {
return [set auto_execs($name) [list $file]]
}
}
return ""
}
set path "[file dirname [info nameof]];.;"
if {[info exists env(WINDIR)]} {
set windir $env(WINDIR)
}
if {[info exists windir]} {
if {$tcl_platform(os) eq "Windows NT"} {
append path "$windir/system32;"
}
append path "$windir/system;$windir;"
}
foreach var {PATH Path path} {
if {[info exists env($var)]} {
append path ";$env($var)"
}
}
foreach dir [split $path {;}] {
# Skip already checked directories
if {[info exists checked($dir)] || $dir eq {}} { continue }
set checked($dir) {}
foreach ext $execExtensions {
set file [file join $dir ${name}${ext}]
if {[file exists $file] && ![file isdirectory $file]} {
return [set auto_execs($name) [list $file]]
}
}
}
return ""
}
} else {
# Unix version.
#
proc auto_execok name {
global auto_execs env
if {[info exists auto_execs($name)]} {
return $auto_execs($name)
}
set auto_execs($name) ""
if {[llength [file split $name]] != 1} {
if {[file executable $name] && ![file isdirectory $name]} {
set auto_execs($name) [list $name]
}
return $auto_execs($name)
}
foreach dir [split $env(PATH) :] {
if {$dir eq ""} {
set dir .
}
set file [file join $dir $name]
if {[file executable $file] && ![file isdirectory $file]} {
set auto_execs($name) [list $file]
return $auto_execs($name)
}
}
return ""
}
}
# ::tcl::CopyDirectory --
#
# This procedure is called by Tcl's core when attempts to call the
# filesystem's copydirectory function fail. The semantics of the call
# are that 'dest' does not yet exist, i.e. dest should become the exact
# image of src. If dest does exist, we throw an error.
#
# Note that making changes to this procedure can change the results
# of running Tcl's tests.
#
# Arguments:
# action - "renaming" or "copying"
# src - source directory
# dest - destination directory
proc tcl::CopyDirectory {action src dest} {
set nsrc [file normalize $src]
set ndest [file normalize $dest]
if {$action eq "renaming"} {
# Can't rename volumes. We could give a more precise
# error message here, but that would break the test suite.
if {[lsearch -exact [file volumes] $nsrc] != -1} {
return -code error "error $action \"$src\" to\
\"$dest\": trying to rename a volume or move a directory\
into itself"
}
}
if {[file exists $dest]} {
if {$nsrc eq $ndest} {
return -code error "error $action \"$src\" to\
\"$dest\": trying to rename a volume or move a directory\
into itself"
}
if {$action eq "copying"} {
return -code error "error $action \"$src\" to\
\"$dest\": file already exists"
} else {
# Depending on the platform, and on the current
# working directory, the directories '.', '..'
# can be returned in various combinations. Anyway,
# if any other file is returned, we must signal an error.
set existing [glob -nocomplain -directory $dest * .*]
eval [linsert \
[glob -nocomplain -directory $dest -type hidden * .*] 0 \
lappend existing]
foreach s $existing {
if {([file tail $s] ne ".") && ([file tail $s] ne "..")} {
return -code error "error $action \"$src\" to\
\"$dest\": file already exists"
}
}
}
} else {
if {[string first $nsrc $ndest] != -1} {
set srclen [expr {[llength [file split $nsrc]] -1}]
set ndest [lindex [file split $ndest] $srclen]
if {$ndest eq [file tail $nsrc]} {
return -code error "error $action \"$src\" to\
\"$dest\": trying to rename a volume or move a directory\
into itself"
}
}
file mkdir $dest
}
# Have to be careful to capture both visible and hidden files.
# We will also be more generous to the file system and not
# assume the hidden and non-hidden lists are non-overlapping.
#
# On Unix 'hidden' files begin with '.'. On other platforms
# or filesystems hidden files may have other interpretations.
set filelist [concat [glob -nocomplain -directory $src *] \
[glob -nocomplain -directory $src -types hidden *]]
foreach s [lsort -unique $filelist] {
if {([file tail $s] ne ".") && ([file tail $s] ne "..")} {
file copy $s [file join $dest [file tail $s]]
}
}
return
}
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