1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221
|
#!/usr/bin/wish
#
# A Tcl shell in a text widget
# Brent Welch, from "Practical Programming in Tcl and Tk"
#
package provide tkshell 1.0
# "namespace eval" is needed to force the creation of the namespace,
# even if it doesn't actually evaluate anything. Otherwise, the use
# of "proc tkshell::..." generates an undefined namespace error.
namespace eval tkshell {}
#-----------------------------------------------
# Create a simple text widget with a Y scrollbar
#-----------------------------------------------
proc tkshell::YScrolled_Text { f args } {
frame $f
eval {text $f.text -wrap none \
-yscrollcommand [list $f.yscroll set]} $args
scrollbar $f.yscroll -orient vertical \
-command [list $f.text yview]
::grid $f.text $f.yscroll -sticky news
::grid rowconfigure $f 0 -weight 1
::grid columnconfigure $f 0 -weight 1
return $f.text
}
#-----------------------------------------------
# Add an X scrollbar
#-----------------------------------------------
proc tkshell::XScrolled_Text { f } {
::set t $f.text
$t configure -xscrollcommand [list $f.xscroll set]
catch {scrollbar $f.xscroll -orient horizontal \
-command [list $t xview]}
::grid $f.xscroll -sticky news
return $t
}
#-----------------------------------------------
# Remove an X scrollbar
#-----------------------------------------------
proc tkshell::NoXScrolled_Text { f } {
::set t $f.text
$t configure -xscrollcommand {}
::grid forget $f.xscroll
}
#---------------------------------------------------------
# Create the shell window in Tk
#---------------------------------------------------------
proc tkshell::MakeEvaluator { {t .eval} {prompt "tcl> "} {prefix ""}} {
global eval
# Text tags give script output, command errors, command
# results, and the prompt a different appearance
$t tag configure prompt -foreground brown3
$t tag configure result -foreground purple
$t tag configure stderr -foreground red
$t tag configure stdout -foreground blue
# Insert the prompt and initialize the limit mark
::set eval(prompt) $prompt
::set eval(prefix) $prefix
$t insert insert $eval(prompt) prompt
$t mark set limit insert
$t mark gravity limit left
focus $t
::set eval(text) $t
# Key bindings that limit input and eval things. The break in
# the bindings skips the default Text binding for the event.
bind $t <Return> {tkshell::EvalTypein ; break}
bind $t <BackSpace> {
if {[%W tag nextrange sel 1.0 end] != ""} {
%W delete sel.first sel.last
} elseif {[%W compare insert > limit]} {
%W delete insert-1c
%W see insert
}
break
}
bind $t <Key> {
if [%W compare insert < limit] {
%W mark set insert end
}
}
}
#-----------------------------------------------------------
# Evaluate everything between limit and end as a Tcl command
#-----------------------------------------------------------
proc tkshell::EvalTypein {} {
global eval
$eval(text) insert insert \n
::set command [$eval(text) get limit end]
if [info complete $command] {
$eval(text) mark set limit insert
tkshell::Eval $command
}
}
#-----------------------------------------------------------
# Echo the command and evaluate it
#-----------------------------------------------------------
proc tkshell::EvalEcho {command} {
global eval
$eval(text) mark set insert end
$eval(text) insert insert $command\n
tkshell::Eval $command
}
#-----------------------------------------------------------
# Evaluate a command and display its result
#-----------------------------------------------------------
proc tkshell::Eval {command} {
global eval
$eval(text) mark set insert end
::set fullcommand $eval(prefix)
append fullcommand $command
if [catch {interp eval $eval(slave) $fullcommand} result] {
$eval(text) insert insert $result error
} else {
$eval(text) insert insert $result result
}
if {[$eval(text) compare insert != "insert linestart"]} {
$eval(text) insert insert \n
}
$eval(text) insert insert $eval(prompt) prompt
$eval(text) see insert
$eval(text) mark set limit insert
return
}
#-----------------------------------------------------------
# Create and initialize the slave interpreter
#-----------------------------------------------------------
proc tkshell::SlaveInit {slave} {
global eval
interp create $slave
load {} Tk $slave
interp alias $slave reset {} tkshell::ResetAlias $slave
interp alias $slave puts {} tkshell::PutsAlias $slave
::set eval(slave) $slave
return $slave
}
#-----------------------------------------------------------
# Evaluate commands in the master interpreter
#-----------------------------------------------------------
proc tkshell::MainInit {} {
global eval
interp alias {} puts {} tkshell::PutsAlias {}
::set eval(slave) {}
}
#-----------------------------------------------------------
# The "reset" alias deletes the slave and starts a new one
#-----------------------------------------------------------
proc tkshell::ResetAlias {slave} {
interp delete $slave
SlaveInit $slave
}
#--------------------------------------------------------------
# The "puts" alias puts stdout and stderr into the text widget
#--------------------------------------------------------------
proc tkshell::PutsAlias {slave args} {
if {[llength $args] > 3} {
error "invalid arguments"
}
::set newline "\n"
if {[string match "-nonewline" [lindex $args 0]]} {
::set newline ""
::set args [lreplace $args 0 0]
}
if {[llength $args] == 1} {
::set chan stdout
::set string [lindex $args 0]$newline
} else {
::set chan [lindex $args 0]
::set string [lindex $args 1]$newline
}
if [regexp (stdout|stderr) $chan] {
global eval
$eval(text) mark gravity limit right
$eval(text) insert limit $string $chan
$eval(text) see limit
$eval(text) mark gravity limit left
} else {
puts -nonewline $chan $string
}
}
#--------------------------------------------------------------
# A few lines is all that's needed to run this thing.
#--------------------------------------------------------------
# tkshell::YScrolled_Text .eval -width 90 -height 5
# pack .eval -fill both -expand true
# tkshell::MakeEvaluator .eval.text "magic> "
# tkshell::MainInit
#--------------------------------------------------------------
|