1 | # init.tcl -- |
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2 | # |
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3 | # Default system startup file for Tcl-based applications. Defines |
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4 | # "unknown" procedure and auto-load facilities. |
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5 | # |
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6 | # RCS: @(#) $Id: init.tcl,v 1.39.2.1 2000/08/07 21:31:33 hobbs Exp $ |
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7 | # |
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8 | # Copyright (c) 1991-1993 The Regents of the University of California. |
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9 | # Copyright (c) 1994-1996 Sun Microsystems, Inc. |
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10 | # Copyright (c) 1998-1999 Scriptics Corporation. |
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11 | # |
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12 | # See the file "license.terms" for information on usage and redistribution |
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13 | # of this file, and for a DISCLAIMER OF ALL WARRANTIES. |
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14 | # |
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15 | |
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16 | if {[info commands package] == ""} { |
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17 | error "version mismatch: library\nscripts expect Tcl version 7.5b1 or later but the loaded version is\nonly [info patchlevel]" |
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18 | } |
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19 | package require -exact Tcl 8.3 |
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20 | |
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21 | # Compute the auto path to use in this interpreter. |
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22 | # The values on the path come from several locations: |
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23 | # |
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24 | # The environment variable TCLLIBPATH |
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25 | # |
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26 | # tcl_library, which is the directory containing this init.tcl script. |
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27 | # tclInitScript.h searches around for the directory containing this |
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28 | # init.tcl and defines tcl_library to that location before sourcing it. |
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29 | # |
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30 | # The parent directory of tcl_library. Adding the parent |
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31 | # means that packages in peer directories will be found automatically. |
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32 | # |
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33 | # Also add the directory where the executable is located, plus ../lib |
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34 | # relative to that path. |
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35 | # |
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36 | # tcl_pkgPath, which is set by the platform-specific initialization routines |
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37 | # On UNIX it is compiled in |
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38 | # On Windows, it is not used |
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39 | # On Macintosh it is "Tool Command Language" in the Extensions folder |
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40 | |
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41 | if {![info exists auto_path]} { |
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42 | if {[info exist env(TCLLIBPATH)]} { |
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43 | set auto_path $env(TCLLIBPATH) |
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44 | } else { |
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45 | set auto_path "" |
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46 | } |
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47 | } |
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48 | if {[string compare [info library] {}]} { |
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49 | foreach __dir [list [info library] [file dirname [info library]]] { |
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50 | if {[lsearch -exact $auto_path $__dir] < 0} { |
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51 | lappend auto_path $__dir |
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52 | } |
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53 | } |
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54 | } |
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55 | set __dir [file join [file dirname [file dirname \ |
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56 | [info nameofexecutable]]] lib] |
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57 | if {[lsearch -exact $auto_path $__dir] < 0} { |
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58 | lappend auto_path $__dir |
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59 | } |
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60 | if {[info exist tcl_pkgPath]} { |
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61 | foreach __dir $tcl_pkgPath { |
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62 | if {[lsearch -exact $auto_path $__dir] < 0} { |
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63 | lappend auto_path $__dir |
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64 | } |
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65 | } |
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66 | } |
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67 | if {[info exists __dir]} { |
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68 | unset __dir |
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69 | } |
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70 | |
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71 | # Windows specific end of initialization |
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72 | |
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73 | if {(![interp issafe]) && [string equal $tcl_platform(platform) "windows"]} { |
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74 | namespace eval tcl { |
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75 | proc envTraceProc {lo n1 n2 op} { |
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76 | set x $::env($n2) |
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77 | set ::env($lo) $x |
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78 | set ::env([string toupper $lo]) $x |
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79 | } |
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80 | } |
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81 | foreach p [array names env] { |
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82 | set u [string toupper $p] |
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83 | if {[string compare $u $p]} { |
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84 | switch -- $u { |
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85 | COMSPEC - |
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86 | PATH { |
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87 | if {![info exists env($u)]} { |
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88 | set env($u) $env($p) |
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89 | } |
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90 | trace variable env($p) w [list tcl::envTraceProc $p] |
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91 | trace variable env($u) w [list tcl::envTraceProc $p] |
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92 | } |
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93 | } |
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94 | } |
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95 | } |
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96 | if {[info exists p]} { |
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97 | unset p |
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98 | } |
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99 | if {[info exists u]} { |
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100 | unset u |
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101 | } |
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102 | if {![info exists env(COMSPEC)]} { |
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103 | if {[string equal $tcl_platform(os) "Windows NT"]} { |
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104 | set env(COMSPEC) cmd.exe |
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105 | } else { |
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106 | set env(COMSPEC) command.com |
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107 | } |
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108 | } |
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109 | } |
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110 | |
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111 | # Setup the unknown package handler |
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112 | |
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113 | package unknown tclPkgUnknown |
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114 | |
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115 | # Conditionalize for presence of exec. |
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116 | |
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117 | if {[llength [info commands exec]] == 0} { |
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118 | |
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119 | # Some machines, such as the Macintosh, do not have exec. Also, on all |
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120 | # platforms, safe interpreters do not have exec. |
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121 | |
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122 | set auto_noexec 1 |
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123 | } |
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124 | set errorCode "" |
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125 | set errorInfo "" |
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126 | |
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127 | # Define a log command (which can be overwitten to log errors |
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128 | # differently, specially when stderr is not available) |
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129 | |
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130 | if {[llength [info commands tclLog]] == 0} { |
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131 | proc tclLog {string} { |
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132 | catch {puts stderr $string} |
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133 | } |
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134 | } |
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135 | |
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136 | # unknown -- |
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137 | # This procedure is called when a Tcl command is invoked that doesn't |
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138 | # exist in the interpreter. It takes the following steps to make the |
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139 | # command available: |
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140 | # |
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141 | # 1. See if the command has the form "namespace inscope ns cmd" and |
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142 | # if so, concatenate its arguments onto the end and evaluate it. |
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143 | # 2. See if the autoload facility can locate the command in a |
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144 | # Tcl script file. If so, load it and execute it. |
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145 | # 3. If the command was invoked interactively at top-level: |
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146 | # (a) see if the command exists as an executable UNIX program. |
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147 | # If so, "exec" the command. |
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148 | # (b) see if the command requests csh-like history substitution |
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149 | # in one of the common forms !!, !<number>, or ^old^new. If |
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150 | # so, emulate csh's history substitution. |
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151 | # (c) see if the command is a unique abbreviation for another |
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152 | # command. If so, invoke the command. |
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153 | # |
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154 | # Arguments: |
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155 | # args - A list whose elements are the words of the original |
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156 | # command, including the command name. |
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157 | |
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158 | proc unknown args { |
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159 | global auto_noexec auto_noload env unknown_pending tcl_interactive |
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160 | global errorCode errorInfo |
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161 | |
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162 | # If the command word has the form "namespace inscope ns cmd" |
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163 | # then concatenate its arguments onto the end and evaluate it. |
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164 | |
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165 | set cmd [lindex $args 0] |
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166 | if {[regexp "^namespace\[ \t\n\]+inscope" $cmd] && [llength $cmd] == 4} { |
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167 | set arglist [lrange $args 1 end] |
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168 | set ret [catch {uplevel $cmd $arglist} result] |
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169 | if {$ret == 0} { |
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170 | return $result |
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171 | } else { |
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172 | return -code $ret -errorcode $errorCode $result |
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173 | } |
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174 | } |
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175 | |
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176 | # Save the values of errorCode and errorInfo variables, since they |
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177 | # may get modified if caught errors occur below. The variables will |
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178 | # be restored just before re-executing the missing command. |
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179 | |
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180 | set savedErrorCode $errorCode |
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181 | set savedErrorInfo $errorInfo |
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182 | set name [lindex $args 0] |
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183 | if {![info exists auto_noload]} { |
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184 | # |
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185 | # Make sure we're not trying to load the same proc twice. |
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186 | # |
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187 | if {[info exists unknown_pending($name)]} { |
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188 | return -code error "self-referential recursion in \"unknown\" for command \"$name\""; |
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189 | } |
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190 | set unknown_pending($name) pending; |
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191 | set ret [catch {auto_load $name [uplevel 1 {namespace current}]} msg] |
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192 | unset unknown_pending($name); |
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193 | if {$ret != 0} { |
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194 | append errorInfo "\n (autoloading \"$name\")" |
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195 | return -code $ret -errorcode $errorCode -errorinfo $errorInfo $msg |
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196 | } |
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197 | if {![array size unknown_pending]} { |
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198 | unset unknown_pending |
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199 | } |
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200 | if {$msg} { |
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201 | set errorCode $savedErrorCode |
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202 | set errorInfo $savedErrorInfo |
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203 | set code [catch {uplevel 1 $args} msg] |
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204 | if {$code == 1} { |
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205 | # |
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206 | # Strip the last five lines off the error stack (they're |
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207 | # from the "uplevel" command). |
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208 | # |
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209 | |
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210 | set new [split $errorInfo \n] |
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211 | set new [join [lrange $new 0 [expr {[llength $new] - 6}]] \n] |
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212 | return -code error -errorcode $errorCode \ |
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213 | -errorinfo $new $msg |
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214 | } else { |
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215 | return -code $code $msg |
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216 | } |
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217 | } |
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218 | } |
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219 | |
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220 | if {([info level] == 1) && [string equal [info script] ""] \ |
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221 | && [info exists tcl_interactive] && $tcl_interactive} { |
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222 | if {![info exists auto_noexec]} { |
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223 | set new [auto_execok $name] |
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224 | if {[string compare {} $new]} { |
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225 | set errorCode $savedErrorCode |
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226 | set errorInfo $savedErrorInfo |
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227 | set redir "" |
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228 | if {[string equal [info commands console] ""]} { |
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229 | set redir ">&@stdout <@stdin" |
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230 | } |
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231 | return [uplevel exec $redir $new [lrange $args 1 end]] |
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232 | } |
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233 | } |
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234 | set errorCode $savedErrorCode |
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235 | set errorInfo $savedErrorInfo |
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236 | if {[string equal $name "!!"]} { |
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237 | set newcmd [history event] |
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238 | } elseif {[regexp {^!(.+)$} $name dummy event]} { |
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239 | set newcmd [history event $event] |
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240 | } elseif {[regexp {^\^([^^]*)\^([^^]*)\^?$} $name dummy old new]} { |
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241 | set newcmd [history event -1] |
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242 | catch {regsub -all -- $old $newcmd $new newcmd} |
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243 | } |
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244 | if {[info exists newcmd]} { |
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245 | tclLog $newcmd |
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246 | history change $newcmd 0 |
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247 | return [uplevel $newcmd] |
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248 | } |
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249 | |
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250 | set ret [catch {set cmds [info commands $name*]} msg] |
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251 | if {[string equal $name "::"]} { |
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252 | set name "" |
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253 | } |
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254 | if {$ret != 0} { |
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255 | return -code $ret -errorcode $errorCode \ |
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256 | "error in unknown while checking if \"$name\" is a unique command abbreviation: $msg" |
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257 | } |
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258 | if {[llength $cmds] == 1} { |
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259 | return [uplevel [lreplace $args 0 0 $cmds]] |
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260 | } |
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261 | if {[llength $cmds]} { |
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262 | if {[string equal $name ""]} { |
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263 | return -code error "empty command name \"\"" |
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264 | } else { |
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265 | return -code error \ |
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266 | "ambiguous command name \"$name\": [lsort $cmds]" |
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267 | } |
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268 | } |
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269 | } |
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270 | return -code error "invalid command name \"$name\"" |
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271 | } |
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272 | |
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273 | # auto_load -- |
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274 | # Checks a collection of library directories to see if a procedure |
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275 | # is defined in one of them. If so, it sources the appropriate |
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276 | # library file to create the procedure. Returns 1 if it successfully |
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277 | # loaded the procedure, 0 otherwise. |
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278 | # |
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279 | # Arguments: |
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280 | # cmd - Name of the command to find and load. |
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281 | # namespace (optional) The namespace where the command is being used - must be |
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282 | # a canonical namespace as returned [namespace current] |
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283 | # for instance. If not given, namespace current is used. |
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284 | |
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285 | proc auto_load {cmd {namespace {}}} { |
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286 | global auto_index auto_oldpath auto_path |
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287 | |
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288 | if {[string length $namespace] == 0} { |
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289 | set namespace [uplevel {namespace current}] |
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290 | } |
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291 | set nameList [auto_qualify $cmd $namespace] |
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292 | # workaround non canonical auto_index entries that might be around |
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293 | # from older auto_mkindex versions |
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294 | lappend nameList $cmd |
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295 | foreach name $nameList { |
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296 | if {[info exists auto_index($name)]} { |
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297 | uplevel #0 $auto_index($name) |
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298 | return [expr {[info commands $name] != ""}] |
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299 | } |
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300 | } |
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301 | if {![info exists auto_path]} { |
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302 | return 0 |
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303 | } |
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304 | |
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305 | if {![auto_load_index]} { |
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306 | return 0 |
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307 | } |
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308 | foreach name $nameList { |
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309 | if {[info exists auto_index($name)]} { |
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310 | uplevel #0 $auto_index($name) |
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311 | # There's a couple of ways to look for a command of a given |
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312 | # name. One is to use |
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313 | # info commands $name |
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314 | # Unfortunately, if the name has glob-magic chars in it like * |
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315 | # or [], it may not match. For our purposes here, a better |
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316 | # route is to use |
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317 | # namespace which -command $name |
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318 | if { ![string equal [namespace which -command $name] ""] } { |
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319 | return 1 |
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320 | } |
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321 | } |
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322 | } |
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323 | return 0 |
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324 | } |
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325 | |
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326 | # auto_load_index -- |
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327 | # Loads the contents of tclIndex files on the auto_path directory |
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328 | # list. This is usually invoked within auto_load to load the index |
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329 | # of available commands. Returns 1 if the index is loaded, and 0 if |
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330 | # the index is already loaded and up to date. |
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331 | # |
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332 | # Arguments: |
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333 | # None. |
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334 | |
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335 | proc auto_load_index {} { |
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336 | global auto_index auto_oldpath auto_path errorInfo errorCode |
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337 | |
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338 | if {[info exists auto_oldpath] && \ |
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339 | [string equal $auto_oldpath $auto_path]} { |
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340 | return 0 |
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341 | } |
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342 | set auto_oldpath $auto_path |
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343 | |
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344 | # Check if we are a safe interpreter. In that case, we support only |
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345 | # newer format tclIndex files. |
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346 | |
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347 | set issafe [interp issafe] |
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348 | for {set i [expr {[llength $auto_path] - 1}]} {$i >= 0} {incr i -1} { |
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349 | set dir [lindex $auto_path $i] |
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350 | set f "" |
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351 | if {$issafe} { |
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352 | catch {source [file join $dir tclIndex]} |
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353 | } elseif {[catch {set f [open [file join $dir tclIndex]]}]} { |
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354 | continue |
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355 | } else { |
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356 | set error [catch { |
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357 | set id [gets $f] |
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358 | if {[string equal $id \ |
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359 | "# Tcl autoload index file, version 2.0"]} { |
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360 | eval [read $f] |
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361 | } elseif {[string equal $id "# Tcl autoload index file: each line identifies a Tcl"]} { |
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362 | while {[gets $f line] >= 0} { |
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363 | if {[string equal [string index $line 0] "#"] \ |
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364 | || ([llength $line] != 2)} { |
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365 | continue |
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366 | } |
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367 | set name [lindex $line 0] |
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368 | set auto_index($name) \ |
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369 | "source [file join $dir [lindex $line 1]]" |
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370 | } |
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371 | } else { |
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372 | error "[file join $dir tclIndex] isn't a proper Tcl index file" |
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373 | } |
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374 | } msg] |
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375 | if {[string compare $f ""]} { |
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376 | close $f |
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377 | } |
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378 | if {$error} { |
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379 | error $msg $errorInfo $errorCode |
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380 | } |
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381 | } |
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382 | } |
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383 | return 1 |
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384 | } |
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385 | |
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386 | # auto_qualify -- |
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387 | # |
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388 | # Compute a fully qualified names list for use in the auto_index array. |
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389 | # For historical reasons, commands in the global namespace do not have leading |
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390 | # :: in the index key. The list has two elements when the command name is |
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391 | # relative (no leading ::) and the namespace is not the global one. Otherwise |
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392 | # only one name is returned (and searched in the auto_index). |
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393 | # |
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394 | # Arguments - |
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395 | # cmd The command name. Can be any name accepted for command |
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396 | # invocations (Like "foo::::bar"). |
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397 | # namespace The namespace where the command is being used - must be |
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398 | # a canonical namespace as returned by [namespace current] |
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399 | # for instance. |
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400 | |
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401 | proc auto_qualify {cmd namespace} { |
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402 | |
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403 | # count separators and clean them up |
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404 | # (making sure that foo:::::bar will be treated as foo::bar) |
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405 | set n [regsub -all {::+} $cmd :: cmd] |
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406 | |
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407 | # Ignore namespace if the name starts with :: |
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408 | # Handle special case of only leading :: |
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409 | |
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410 | # Before each return case we give an example of which category it is |
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411 | # with the following form : |
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412 | # ( inputCmd, inputNameSpace) -> output |
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413 | |
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414 | if {[regexp {^::(.*)$} $cmd x tail]} { |
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415 | if {$n > 1} { |
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416 | # ( ::foo::bar , * ) -> ::foo::bar |
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417 | return [list $cmd] |
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418 | } else { |
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419 | # ( ::global , * ) -> global |
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420 | return [list $tail] |
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421 | } |
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422 | } |
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423 | |
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424 | # Potentially returning 2 elements to try : |
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425 | # (if the current namespace is not the global one) |
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426 | |
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427 | if {$n == 0} { |
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428 | if {[string equal $namespace ::]} { |
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429 | # ( nocolons , :: ) -> nocolons |
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430 | return [list $cmd] |
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431 | } else { |
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432 | # ( nocolons , ::sub ) -> ::sub::nocolons nocolons |
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433 | return [list ${namespace}::$cmd $cmd] |
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434 | } |
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435 | } elseif {[string equal $namespace ::]} { |
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436 | # ( foo::bar , :: ) -> ::foo::bar |
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437 | return [list ::$cmd] |
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438 | } else { |
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439 | # ( foo::bar , ::sub ) -> ::sub::foo::bar ::foo::bar |
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440 | return [list ${namespace}::$cmd ::$cmd] |
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441 | } |
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442 | } |
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443 | |
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444 | # auto_import -- |
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445 | # |
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446 | # Invoked during "namespace import" to make see if the imported commands |
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447 | # reside in an autoloaded library. If so, the commands are loaded so |
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448 | # that they will be available for the import links. If not, then this |
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449 | # procedure does nothing. |
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450 | # |
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451 | # Arguments - |
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452 | # pattern The pattern of commands being imported (like "foo::*") |
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453 | # a canonical namespace as returned by [namespace current] |
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454 | |
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455 | proc auto_import {pattern} { |
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456 | global auto_index |
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457 | |
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458 | # If no namespace is specified, this will be an error case |
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459 | |
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460 | if {![string match *::* $pattern]} { |
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461 | return |
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462 | } |
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463 | |
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464 | set ns [uplevel namespace current] |
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465 | set patternList [auto_qualify $pattern $ns] |
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466 | |
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467 | auto_load_index |
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468 | |
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469 | foreach pattern $patternList { |
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470 | foreach name [array names auto_index] { |
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471 | if {[string match $pattern $name] && \ |
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472 | [string equal "" [info commands $name]]} { |
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473 | uplevel #0 $auto_index($name) |
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474 | } |
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475 | } |
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476 | } |
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477 | } |
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478 | |
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479 | # auto_execok -- |
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480 | # |
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481 | # Returns string that indicates name of program to execute if |
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482 | # name corresponds to a shell builtin or an executable in the |
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483 | # Windows search path, or "" otherwise. Builds an associative |
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484 | # array auto_execs that caches information about previous checks, |
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485 | # for speed. |
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486 | # |
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487 | # Arguments: |
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488 | # name - Name of a command. |
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489 | |
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490 | if {[string equal windows $tcl_platform(platform)]} { |
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491 | # Windows version. |
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492 | # |
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493 | # Note that info executable doesn't work under Windows, so we have to |
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494 | # look for files with .exe, .com, or .bat extensions. Also, the path |
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495 | # may be in the Path or PATH environment variables, and path |
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496 | # components are separated with semicolons, not colons as under Unix. |
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497 | # |
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498 | proc auto_execok name { |
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499 | global auto_execs env tcl_platform |
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500 | |
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501 | if {[info exists auto_execs($name)]} { |
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502 | return $auto_execs($name) |
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503 | } |
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504 | set auto_execs($name) "" |
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505 | |
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506 | set shellBuiltins [list cls copy date del erase dir echo mkdir \ |
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507 | md rename ren rmdir rd time type ver vol] |
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508 | if {[string equal $tcl_platform(os) "Windows NT"]} { |
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509 | # NT includes the 'start' built-in |
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510 | lappend shellBuiltins "start" |
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511 | } |
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512 | |
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513 | if {[lsearch -exact $shellBuiltins $name] != -1} { |
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514 | return [set auto_execs($name) [list $env(COMSPEC) /c $name]] |
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515 | } |
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516 | |
---|
517 | if {[llength [file split $name]] != 1} { |
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518 | foreach ext {{} .com .exe .bat} { |
---|
519 | set file ${name}${ext} |
---|
520 | if {[file exists $file] && ![file isdirectory $file]} { |
---|
521 | return [set auto_execs($name) [list $file]] |
---|
522 | } |
---|
523 | } |
---|
524 | return "" |
---|
525 | } |
---|
526 | |
---|
527 | set path "[file dirname [info nameof]];.;" |
---|
528 | if {[info exists env(WINDIR)]} { |
---|
529 | set windir $env(WINDIR) |
---|
530 | } |
---|
531 | if {[info exists windir]} { |
---|
532 | if {[string equal $tcl_platform(os) "Windows NT"]} { |
---|
533 | append path "$windir/system32;" |
---|
534 | } |
---|
535 | append path "$windir/system;$windir;" |
---|
536 | } |
---|
537 | |
---|
538 | foreach var {PATH Path path} { |
---|
539 | if {[info exists env($var)]} { |
---|
540 | append path ";$env($var)" |
---|
541 | } |
---|
542 | } |
---|
543 | |
---|
544 | foreach dir [split $path {;}] { |
---|
545 | # Skip already checked directories |
---|
546 | if {[info exists checked($dir)] || [string equal {} $dir]} { continue } |
---|
547 | set checked($dir) {} |
---|
548 | foreach ext {{} .com .exe .bat} { |
---|
549 | set file [file join $dir ${name}${ext}] |
---|
550 | if {[file exists $file] && ![file isdirectory $file]} { |
---|
551 | return [set auto_execs($name) [list $file]] |
---|
552 | } |
---|
553 | } |
---|
554 | } |
---|
555 | return "" |
---|
556 | } |
---|
557 | |
---|
558 | } else { |
---|
559 | # Unix version. |
---|
560 | # |
---|
561 | proc auto_execok name { |
---|
562 | global auto_execs env |
---|
563 | |
---|
564 | if {[info exists auto_execs($name)]} { |
---|
565 | return $auto_execs($name) |
---|
566 | } |
---|
567 | set auto_execs($name) "" |
---|
568 | if {[llength [file split $name]] != 1} { |
---|
569 | if {[file executable $name] && ![file isdirectory $name]} { |
---|
570 | set auto_execs($name) [list $name] |
---|
571 | } |
---|
572 | return $auto_execs($name) |
---|
573 | } |
---|
574 | foreach dir [split $env(PATH) :] { |
---|
575 | if {[string equal $dir ""]} { |
---|
576 | set dir . |
---|
577 | } |
---|
578 | set file [file join $dir $name] |
---|
579 | if {[file executable $file] && ![file isdirectory $file]} { |
---|
580 | set auto_execs($name) [list $file] |
---|
581 | return $auto_execs($name) |
---|
582 | } |
---|
583 | } |
---|
584 | return "" |
---|
585 | } |
---|
586 | |
---|
587 | } |
---|