Minor enhancement to the base Tk Console. Additional change. (Tcl recipe) by Mike Collins

ActiveState Code (http://code.activestate.com/recipes/523001/)

# console.tcl --
#
# This code constructs the console window for an application.  It
# can be used by non-unix systems that do not have built-in support
# for shells.
#
# RCS: @(#) $Id: console.tcl,v 1.22.2.3 2005/05/31 04:58:00 hobbs Exp $
#
# Copyright (c) 1995-1997 Sun Microsystems, Inc.
# Copyright (c) 1998-2000 Ajuba Solutions.
#
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
#

# TODO: history - remember partially written command

namespace eval ::tk::console {
    variable blinkTime   500 ; # msecs to blink braced range for
    variable blinkRange  1   ; # enable blinking of the entire braced range
    variable magicKeys   1   ; # enable brace matching and proc/var recognition
    variable maxLines    600 ; # maximum # of lines buffered in console
    variable showMatches 1   ; # show multiple expand matches

    variable inPlugin [info exists embed_args]
    variable defaultPrompt  ; # default prompt if tcl_prompt1 isn't used


    if {$inPlugin} {
    set defaultPrompt {subst {[history nextid] % }}
    } else {
    set defaultPrompt {subst {([file tail [pwd]]) [history nextid] % }}
    }
}

# simple compat function for tkcon code added for this console
interp alias {} EvalAttached {} consoleinterp eval

# ::tk::ConsoleInit --
# This procedure constructs and configures the console windows.
#
# Arguments:
#   None.

proc ::tk::ConsoleInit {} {
    global tcl_platform

    if {![consoleinterp eval {set tcl_interactive}]} {
    wm withdraw .
    }

    if {[string equal $tcl_platform(platform) "macintosh"]
        || [string equal [tk windowingsystem] "aqua"]} {
    set mod "Cmd"
    } else {
    set mod "Ctrl"
    }

    if {[catch {menu .menubar} err]} { bgerror "INIT: $err" }
    .menubar add cascade -label File -menu .menubar.file -underline 0
    .menubar add cascade -label Edit -menu .menubar.edit -underline 0

    menu .menubar.file -tearoff 0
    .menubar.file add command -label [mc "Source..."] \
        -underline 0 -command tk::ConsoleSource
    .menubar.file add command -label [mc "Hide Console"] \
        -underline 0 -command {wm withdraw .}
    .menubar.file add command -label [mc "Clear Console"] \
        -underline 0 -command {.console delete 1.0 "promptEnd linestart"}
   if {[string equal $tcl_platform(platform) "macintosh"]
       || [string equal [tk windowingsystem] "aqua"]} {
    .menubar.file add command -label [mc "Quit"] \
        -command exit -accel Cmd-Q
    } else {
    .menubar.file add command -label [mc "Exit"] \
        -underline 1 -command exit
    }

    menu .menubar.edit -tearoff 0
    .menubar.edit add command -label [mc "Cut"] -underline 2 \
        -command { event generate .console <<Cut>> } -accel "$mod+X"
    .menubar.edit add command -label [mc "Copy"] -underline 0 \
        -command { event generate .console <<Copy>> } -accel "$mod+C"
    .menubar.edit add command -label [mc "Paste"] -underline 1 \
        -command { event generate .console <<Paste>> } -accel "$mod+V"

    if {[string compare $tcl_platform(platform) "windows"]} {
    .menubar.edit add command -label [mc "Clear"] -underline 2 \
        -command { event generate .console <<Clear>> }
    } else {
    .menubar.edit add command -label [mc "Delete"] -underline 0 \
        -command { event generate .console <<Clear>> } -accel "Del"

    .menubar add cascade -label Help -menu .menubar.help -underline 0
    menu .menubar.help -tearoff 0
    .menubar.help add command -label [mc "About..."] \
        -underline 0 -command tk::ConsoleAbout
    }

    . configure -menu .menubar


    set con [text .console  -yscrollcommand [list .sb set] -setgrid true]
    scrollbar .sb -command [list $con yview]
    pack .sb -side right -fill both
    pack $con -fill both -expand 1 -side left
    switch -exact $tcl_platform(platform) {
    "macintosh" {
        $con configure -font {Monaco 9 normal} -highlightthickness 0
    }
    "windows" {
        $con configure -font systemfixed
    }
    "unix" {
        if {[string equal [tk windowingsystem] "aqua"]} {
        $con configure -font {Monaco 9 normal} -highlightthickness 0
        }
    }
    }


    #added for right click menu
    if {[catch {menu .cutPasteMenu -tearoff 0 -type normal} err]} { bgerror "INIT: $err" }
#     .cutPasteMenu add command -label [mc "Cut"] -underline 2 \
#       -command { event generate .console <<Cut>> } -accel "$mod+X"
    .cutPasteMenu add command -label [mc "Copy"] -underline 0 \
        -command { event generate .console <<Copy>> } -accel "$mod+C"
    .cutPasteMenu add command -label [mc "Paste"] -underline 1 \
        -command { event generate .console <<Paste>> } -accel "$mod+V"
#     .cutPasteMenu  add command -label [mc "Clear"] -underline 2 \
#       -command { event generate .console <<Clear>> }

    ConsoleBind $con

    $con tag configure stderr   -foreground red
    $con tag configure stdin    -foreground blue
    $con tag configure prompt   -foreground \#8F4433
    $con tag configure proc -foreground \#008800
    $con tag configure var  -background \#FFC0D0
    $con tag raise sel
    $con tag configure blink    -background \#FFFF00
    $con tag configure find -background \#FFFF00

    focus $con

    # changed this so as not to leave a wish.exe left running
    wm protocol . WM_DELETE_WINDOW {
        if {[wm state .]=="normal"} {
#             destroy .
            exit
        } else {
            wm withdraw .
        }
    }
    wm title . [mc "Console"]
    flush stdout
    $con mark set output [$con index "end - 1 char"]
    tk::TextSetCursor $con end
    $con mark set promptEnd insert
    $con mark gravity promptEnd left

    # this is the binding that pops the menu
    # and additionally enables/disables the copy function
    # based on if you have selected any data
    bind all <Button-3> {
        .cutPasteMenu entryconfigure 0 -state normal
        if {[catch {%W get sel.first sel.last}]} {
            .cutPasteMenu entryconfigure 0 -state disabled
        }
        tk_popup .cutPasteMenu [winfo pointerx %W] [winfo pointery %W]
    }

    # A variant of ConsolePrompt to avoid a 'puts' call
    set w $con
    set temp [$w index "end - 1 char"]
    $w mark set output end
    if {![consoleinterp eval "info exists tcl_prompt1"]} {
    set string [EvalAttached $::tk::console::defaultPrompt]
    $w insert output $string stdout
    }
    $w mark set output $temp
    ::tk::TextSetCursor $w end
    $w mark set promptEnd insert
    $w mark gravity promptEnd left

    if {$tcl_platform(platform) eq "windows"} {
    # Subtle work-around to erase the '% ' that tclMain.c prints out
    after idle [list $con delete 1.0 output]
    }
}

# ::tk::ConsoleSource --
#
# Prompts the user for a file to source in the main interpreter.
#
# Arguments:
# None.

proc ::tk::ConsoleSource {} {
    set filename [tk_getOpenFile -defaultextension .tcl -parent . \
        -title [mc "Select a file to source"] \
        -filetypes [list \
        [list [mc "Tcl Scripts"] .tcl] \
        [list [mc "All Files"] *]]]
    if {[string compare $filename ""]} {
        set cmd [list source $filename]
    if {[catch {consoleinterp eval $cmd} result]} {
        ConsoleOutput stderr "$result\n"
    }
    }
}

# ::tk::ConsoleInvoke --
# Processes the command line input.  If the command is complete it
# is evaled in the main interpreter.  Otherwise, the continuation
# prompt is added and more input may be added.
#
# Arguments:
# None.

proc ::tk::ConsoleInvoke {args} {
    set ranges [.console tag ranges input]
    set cmd ""
    if {[llength $ranges]} {
    set pos 0
    while {[string compare [lindex $ranges $pos] ""]} {
        set start [lindex $ranges $pos]
        set end [lindex $ranges [incr pos]]
        append cmd [.console get $start $end]
        incr pos
    }
    }
    if {[string equal $cmd ""]} {
    ConsolePrompt
    } elseif {[info complete $cmd]} {
    .console mark set output end
    .console tag delete input
    set result [consoleinterp record $cmd]
    if {[string compare $result ""]} {
        puts $result
    }
    ConsoleHistory reset
    ConsolePrompt
    } else {
    ConsolePrompt partial
    }
    .console yview -pickplace insert
}

# ::tk::ConsoleHistory --
# This procedure implements command line history for the
# console.  In general is evals the history command in the
# main interpreter to obtain the history.  The variable
# ::tk::HistNum is used to store the current location in the history.
#
# Arguments:
# cmd - Which action to take: prev, next, reset.

set ::tk::HistNum 1
proc ::tk::ConsoleHistory {cmd} {
    variable HistNum

    switch $cmd {
        prev {
        incr HistNum -1
        if {$HistNum == 0} {
        set cmd {history event [expr {[history nextid] -1}]}
        } else {
        set cmd "history event $HistNum"
        }
            if {[catch {consoleinterp eval $cmd} cmd]} {
                incr HistNum
                return
            }
           .console delete promptEnd end
           .console insert promptEnd $cmd {input stdin}
        }
        next {
        incr HistNum
        if {$HistNum == 0} {
        set cmd {history event [expr {[history nextid] -1}]}
        } elseif {$HistNum > 0} {
        set cmd ""
        set HistNum 1
        } else {
        set cmd "history event $HistNum"
        }
        if {[string compare $cmd ""]} {
        catch {consoleinterp eval $cmd} cmd
        }
        .console delete promptEnd end
        .console insert promptEnd $cmd {input stdin}
        }
        reset {
            set HistNum 1
        }
    }
}

# ::tk::ConsolePrompt --
# This procedure draws the prompt.  If tcl_prompt1 or tcl_prompt2
# exists in the main interpreter it will be called to generate the 
# prompt.  Otherwise, a hard coded default prompt is printed.
#
# Arguments:
# partial - Flag to specify which prompt to print.

proc ::tk::ConsolePrompt {{partial normal}} {
    set w .console
    if {[string equal $partial "normal"]} {
    set temp [$w index "end - 1 char"]
    $w mark set output end
        if {[consoleinterp eval "info exists tcl_prompt1"]} {
            consoleinterp eval "eval \[set tcl_prompt1\]"
        } else {
            puts -nonewline [EvalAttached $::tk::console::defaultPrompt]
        }
    } else {
    set temp [$w index output]
    $w mark set output end
        if {[consoleinterp eval "info exists tcl_prompt2"]} {
            consoleinterp eval "eval \[set tcl_prompt2\]"
        } else {
        puts -nonewline "> "
        }
    }
    flush stdout
    $w mark set output $temp
    ::tk::TextSetCursor $w end
    $w mark set promptEnd insert
    $w mark gravity promptEnd left
    ::tk::console::ConstrainBuffer $w $::tk::console::maxLines
    $w see end
}

# ::tk::ConsoleBind --
# This procedure first ensures that the default bindings for the Text
# class have been defined.  Then certain bindings are overridden for
# the class.
#
# Arguments:
# None.

proc ::tk::ConsoleBind {w} {
    bindtags $w [list $w Console PostConsole [winfo toplevel $w] all]

    ## Get all Text bindings into Console
    foreach ev [bind Text] { bind Console $ev [bind Text $ev] }
    ## We really didn't want the newline insertion...
    bind Console <Control-Key-o> {}
    ## ...or any Control-v binding (would block <<Paste>>)
    bind Console <Control-Key-v> {}

    # For the moment, transpose isn't enabled until the console
    # gets and overhaul of how it handles input -- hobbs
    bind Console <Control-Key-t> {}

    # Ignore all Alt, Meta, and Control keypresses unless explicitly bound.
    # Otherwise, if a widget binding for one of these is defined, the

    bind Console <Alt-KeyPress> {# nothing }
    bind Console <Meta-KeyPress> {# nothing}
    bind Console <Control-KeyPress> {# nothing}

    foreach {ev key} {
    <<Console_Prev>>        <Key-Up>
    <<Console_Next>>        <Key-Down>
    <<Console_NextImmediate>>   <Control-Key-n>
    <<Console_PrevImmediate>>   <Control-Key-p>
    <<Console_PrevSearch>>      <Control-Key-r>
    <<Console_NextSearch>>      <Control-Key-s>

    <<Console_Expand>>      <Key-Tab>
    <<Console_Expand>>      <Key-Escape>
    <<Console_ExpandFile>>      <Control-Shift-Key-F>
    <<Console_ExpandProc>>      <Control-Shift-Key-P>
    <<Console_ExpandVar>>       <Control-Shift-Key-V>
    <<Console_Tab>>         <Control-Key-i>
    <<Console_Tab>>         <Meta-Key-i>
    <<Console_Eval>>        <Key-Return>
    <<Console_Eval>>        <Key-KP_Enter>

    <<Console_Clear>>       <Control-Key-l>
    <<Console_KillLine>>        <Control-Key-k>
    <<Console_Transpose>>       <Control-Key-t>
    <<Console_ClearLine>>       <Control-Key-u>
    <<Console_SaveCommand>>     <Control-Key-z>
    } {
    event add $ev $key
    bind Console $key {}
    }

    bind Console <<Console_Expand>> {
    if {[%W compare insert > promptEnd]} {::tk::console::Expand %W}
    }
    bind Console <<Console_ExpandFile>> {
    if {[%W compare insert > promptEnd]} {::tk::console::Expand %W path}
    }
    bind Console <<Console_ExpandProc>> {
    if {[%W compare insert > promptEnd]} {::tk::console::Expand %W proc}
    }
    bind Console <<Console_ExpandVar>> {
    if {[%W compare insert > promptEnd]} {::tk::console::Expand %W var}
    }
    bind Console <<Console_Eval>> {
    %W mark set insert {end - 1c}
    tk::ConsoleInsert %W "\n"
    tk::ConsoleInvoke
    break
    }
    bind Console <Delete> {
    if {[string compare {} [%W tag nextrange sel 1.0 end]] \
        && [%W compare sel.first >= promptEnd]} {
        %W delete sel.first sel.last
    } elseif {[%W compare insert >= promptEnd]} {
        %W delete insert
        %W see insert
    }
    }
    bind Console <BackSpace> {
    if {[string compare {} [%W tag nextrange sel 1.0 end]] \
        && [%W compare sel.first >= promptEnd]} {
        %W delete sel.first sel.last
    } elseif {[%W compare insert != 1.0] && \
        [%W compare insert > promptEnd]} {
        %W delete insert-1c
        %W see insert
    }
    }
    bind Console <Control-h> [bind Console <BackSpace>]

    bind Console <Home> {
    if {[%W compare insert < promptEnd]} {
        tk::TextSetCursor %W {insert linestart}
    } else {
        tk::TextSetCursor %W promptEnd
    }
    }
    bind Console <Control-a> [bind Console <Home>]
    bind Console <End> {
    tk::TextSetCursor %W {insert lineend}
    }
    bind Console <Control-e> [bind Console <End>]
    bind Console <Control-d> {
    if {[%W compare insert < promptEnd]} break
    %W delete insert
    }
    bind Console <<Console_KillLine>> {
    if {[%W compare insert < promptEnd]} break
    if {[%W compare insert == {insert lineend}]} {
        %W delete insert
    } else {
        %W delete insert {insert lineend}
    }
    }
    bind Console <<Console_Clear>> {
    ## Clear console display
    %W delete 1.0 "promptEnd linestart"
    }
    bind Console <<Console_ClearLine>> {
    ## Clear command line (Unix shell staple)
    %W delete promptEnd end
    }
    bind Console <Meta-d> {
    if {[%W compare insert >= promptEnd]} {
        %W delete insert {insert wordend}
    }
    }
    bind Console <Meta-BackSpace> {
    if {[%W compare {insert -1c wordstart} >= promptEnd]} {
        %W delete {insert -1c wordstart} insert
    }
    }
    bind Console <Meta-d> {
    if {[%W compare insert >= promptEnd]} {
        %W delete insert {insert wordend}
    }
    }
    bind Console <Meta-BackSpace> {
    if {[%W compare {insert -1c wordstart} >= promptEnd]} {
        %W delete {insert -1c wordstart} insert
    }
    }
    bind Console <Meta-Delete> {
    if {[%W compare insert >= promptEnd]} {
        %W delete insert {insert wordend}
    }
    }
    bind Console <<Console_Prev>> {
    tk::ConsoleHistory prev
    }
    bind Console <<Console_Next>> {
    tk::ConsoleHistory next
    }
    bind Console <Insert> {
    catch {tk::ConsoleInsert %W [::tk::GetSelection %W PRIMARY]}
    }
    bind Console <KeyPress> {
    tk::ConsoleInsert %W %A
    }
    bind Console <F9> {
    eval destroy [winfo child .]
    if {[string equal $tcl_platform(platform) "macintosh"]} {
        if {[catch {source [file join $tk_library console.tcl]}]} {source -rsrc console}
    } else {
        source [file join $tk_library console.tcl]
    }
    }
    if {[string equal $::tcl_platform(platform) "macintosh"]
       || [string equal [tk windowingsystem] "aqua"]} {
        bind Console <Command-q> {
        exit
        }
    }
    bind Console <<Cut>> {
        # Same as the copy event
        clipboard clear -displayof %W
    if {![catch {set data [%W get sel.first sel.last]}]} {
        clipboard append -displayof %W $data
    }
    }
    bind Console <<Copy>> {
        clipboard clear -displayof %W
    if {![catch {set data [%W get sel.first sel.last]}]} {
        clipboard append -displayof %W $data
    }
    }
    bind Console <<Paste>> {
    catch {
        set clip [::tk::GetSelection %W CLIPBOARD]
        set list [split $clip \n\r]
        tk::ConsoleInsert %W [lindex $list 0]
        foreach x [lrange $list 1 end] {
        %W mark set insert {end - 1c}
        tk::ConsoleInsert %W "\n"
        tk::ConsoleInvoke
        tk::ConsoleInsert %W $x
        }
    }
    }

    ##
    ## Bindings for doing special things based on certain keys
    ##
    bind PostConsole <Key-parenright> {
    if {[string compare \\ [%W get insert-2c]]} {
        ::tk::console::MatchPair %W \( \) promptEnd
    }
    }
    bind PostConsole <Key-bracketright> {
    if {[string compare \\ [%W get insert-2c]]} {
        ::tk::console::MatchPair %W \[ \] promptEnd
    }
    }
    bind PostConsole <Key-braceright> {
    if {[string compare \\ [%W get insert-2c]]} {
        ::tk::console::MatchPair %W \{ \} promptEnd
    }
    }
    bind PostConsole <Key-quotedbl> {
    if {[string compare \\ [%W get insert-2c]]} {
        ::tk::console::MatchQuote %W promptEnd
    }
    }

    bind PostConsole <KeyPress> {
    if {"%A" != ""} {
        ::tk::console::TagProc %W
    }
    break
    }
}

# ::tk::ConsoleInsert --
# Insert a string into a text at the point of the insertion cursor.
# If there is a selection in the text, and it covers the point of the
# insertion cursor, then delete the selection before inserting.  Insertion
# is restricted to the prompt area.
#
# Arguments:
# w -       The text window in which to insert the string
# s -       The string to insert (usually just a single character)

proc ::tk::ConsoleInsert {w s} {
    if {[string equal $s ""]} {
    return
    }
    catch {
    if {[$w compare sel.first <= insert]
        && [$w compare sel.last >= insert]} {
        $w tag remove sel sel.first promptEnd
        $w delete sel.first sel.last
    }
    }
    if {[$w compare insert < promptEnd]} {
    $w mark set insert end
    }
    $w insert insert $s {input stdin}
    $w see insert
}

# ::tk::ConsoleOutput --
#
# This routine is called directly by ConsolePutsCmd to cause a string
# to be displayed in the console.
#
# Arguments:
# dest -    The output tag to be used: either "stderr" or "stdout".
# string -  The string to be displayed.

proc ::tk::ConsoleOutput {dest string} {
    set w .console
    $w insert output $string $dest
    ::tk::console::ConstrainBuffer $w $::tk::console::maxLines
    $w see insert
}

# ::tk::ConsoleExit --
#
# This routine is called by ConsoleEventProc when the main window of
# the application is destroyed.  Don't call exit - that probably already
# happened.  Just delete our window.
#
# Arguments:
# None.

proc ::tk::ConsoleExit {} {
    destroy .
}

# ::tk::ConsoleAbout --
#
# This routine displays an About box to show Tcl/Tk version info.
#
# Arguments:
# None.

proc ::tk::ConsoleAbout {} {
    tk_messageBox -type ok -message "[mc {Tcl for Windows}]

Tcl $::tcl_patchLevel
Tk $::tk_patchLevel"
}

# ::tk::console::TagProc --
#
# Tags a procedure in the console if it's recognized
# This procedure is not perfect.  However, making it perfect wastes
# too much CPU time...
#
# Arguments:
#   w   - console text widget

proc ::tk::console::TagProc w {
    if {!$::tk::console::magicKeys} { return }
    set exp "\[^\\\\\]\[\[ \t\n\r\;{}\"\$\]"
    set i [$w search -backwards -regexp $exp insert-1c promptEnd-1c]
    if {$i == ""} {set i promptEnd} else {append i +2c}
    regsub -all "\[\[\\\\\\?\\*\]" [$w get $i "insert-1c wordend"] {\\\0} c
    if {[llength [EvalAttached [list info commands $c]]]} {
    $w tag add proc $i "insert-1c wordend"
    } else {
    $w tag remove proc $i "insert-1c wordend"
    }
    if {[llength [EvalAttached [list info vars $c]]]} {
    $w tag add var $i "insert-1c wordend"
    } else {
    $w tag remove var $i "insert-1c wordend"
    }
}

# ::tk::console::MatchPair --
#
# Blinks a matching pair of characters
# c2 is assumed to be at the text index 'insert'.
# This proc is really loopy and took me an hour to figure out given
# all possible combinations with escaping except for escaped \'s.
# It doesn't take into account possible commenting... Oh well.  If
# anyone has something better, I'd like to see/use it.  This is really
# only efficient for small contexts.
#
# Arguments:
#   w   - console text widget
#   c1  - first char of pair
#   c2  - second char of pair
#
# Calls:    ::tk::console::Blink
 
proc ::tk::console::MatchPair {w c1 c2 {lim 1.0}} {
    if {!$::tk::console::magicKeys} { return }
    if {[string compare {} [set ix [$w search -back $c1 insert $lim]]]} {
    while {
        [string match {\\} [$w get $ix-1c]] &&
        [string compare {} [set ix [$w search -back $c1 $ix-1c $lim]]]
    } {}
    set i1 insert-1c
    while {[string compare {} $ix]} {
        set i0 $ix
        set j 0
        while {[string compare {} [set i0 [$w search $c2 $i0 $i1]]]} {
        append i0 +1c
        if {[string match {\\} [$w get $i0-2c]]} continue
        incr j
        }
        if {!$j} break
        set i1 $ix
        while {$j && [string compare {} \
            [set ix [$w search -back $c1 $ix $lim]]]} {
        if {[string match {\\} [$w get $ix-1c]]} continue
        incr j -1
        }
    }
    if {[string match {} $ix]} { set ix [$w index $lim] }
    } else { set ix [$w index $lim] }
    if {$::tk::console::blinkRange} {
    Blink $w $ix [$w index insert]
    } else {
    Blink $w $ix $ix+1c [$w index insert-1c] [$w index insert]
    }
}

# ::tk::console::MatchQuote --
#
# Blinks between matching quotes.
# Blinks just the quote if it's unmatched, otherwise blinks quoted string
# The quote to match is assumed to be at the text index 'insert'.
#
# Arguments:
#   w   - console text widget
#
# Calls:    ::tk::console::Blink
 
proc ::tk::console::MatchQuote {w {lim 1.0}} {
    if {!$::tk::console::magicKeys} { return }
    set i insert-1c
    set j 0
    while {[string compare [set i [$w search -back \" $i $lim]] {}]} {
    if {[string match {\\} [$w get $i-1c]]} continue
    if {!$j} {set i0 $i}
    incr j
    }
    if {$j&1} {
    if {$::tk::console::blinkRange} {
        Blink $w $i0 [$w index insert]
    } else {
        Blink $w $i0 $i0+1c [$w index insert-1c] [$w index insert]
    }
    } else {
    Blink $w [$w index insert-1c] [$w index insert]
    }
}

# ::tk::console::Blink --
#
# Blinks between n index pairs for a specified duration.
#
# Arguments:
#   w   - console text widget
#   i1  - start index to blink region
#   i2  - end index of blink region
#   dur - duration in usecs to blink for
#
# Outputs:
#   blinks selected characters in $w

proc ::tk::console::Blink {w args} {
    eval [list $w tag add blink] $args
    after $::tk::console::blinkTime [list $w] tag remove blink $args
}

# ::tk::console::ConstrainBuffer --
#
# This limits the amount of data in the text widget
# Called by Prompt and ConsoleOutput
#
# Arguments:
#   w   - console text widget
#   size    - # of lines to constrain to
#
# Outputs:
#   may delete data in console widget

proc ::tk::console::ConstrainBuffer {w size} {
    if {[$w index end] > $size} {
    $w delete 1.0 [expr {int([$w index end])-$size}].0
    }
}

# ::tk::console::Expand --
#
# Arguments:
# ARGS: w   - text widget in which to expand str
#   type    - type of expansion (path / proc / variable)
#
# Calls:    ::tk::console::Expand(Pathname|Procname|Variable)
#
# Outputs:  The string to match is expanded to the longest possible match.
#       If ::tk::console::showMatches is non-zero and the longest match
#       equaled the string to expand, then all possible matches are
#       output to stdout.  Triggers bell if no matches are found.
#
# Returns:  number of matches found

proc ::tk::console::Expand {w {type ""}} {
    set exp "\[^\\\\\]\[\[ \t\n\r\\\{\"\\\\\$\]"
    set tmp [$w search -backwards -regexp $exp insert-1c promptEnd-1c]
    if {$tmp == ""} {set tmp promptEnd} else {append tmp +2c}
    if {[$w compare $tmp >= insert]} { return }
    set str [$w get $tmp insert]
    switch -glob $type {
    path* { set res [ExpandPathname $str] }
    proc* { set res [ExpandProcname $str] }
    var*  { set res [ExpandVariable $str] }
    default {
        set res {}
        foreach t {Pathname Procname Variable} {
        if {![catch {Expand$t $str} res] && ($res != "")} { break }
        }
    }
    }
    set len [llength $res]
    if {$len} {
    set repl [lindex $res 0]
    $w delete $tmp insert
    $w insert $tmp $repl {input stdin}
    if {($len > 1) && $::tk::console::showMatches \
        && [string equal $repl $str]} {
        puts stdout [lsort [lreplace $res 0 0]]
    }
    } else { bell }
    return [incr len -1]
}

# ::tk::console::ExpandPathname --
#
# Expand a file pathname based on $str
# This is based on UNIX file name conventions
#
# Arguments:
#   str - partial file pathname to expand
#
# Calls:    ::tk::console::ExpandBestMatch
#
# Returns:  list containing longest unique match followed by all the
#       possible further matches
 
proc ::tk::console::ExpandPathname str {
    set pwd [EvalAttached pwd]
    if {[catch {EvalAttached [list cd [file dirname $str]]} err]} {
    return -code error $err
    }
    set dir [file tail $str]
    ## Check to see if it was known to be a directory and keep the trailing
    ## slash if so (file tail cuts it off)
    if {[string match */ $str]} { append dir / }
    if {[catch {lsort [EvalAttached [list glob $dir*]]} m]} {
    set match {}
    } else {
    if {[llength $m] > 1} {
        global tcl_platform
        if {[string match windows $tcl_platform(platform)]} {
        ## Windows is screwy because it's case insensitive
        set tmp [ExpandBestMatch [string tolower $m] \
            [string tolower $dir]]
        ## Don't change case if we haven't changed the word
        if {[string length $dir]==[string length $tmp]} {
            set tmp $dir
        }
        } else {
        set tmp [ExpandBestMatch $m $dir]
        }
        if {[string match ?*/* $str]} {
        set tmp [file dirname $str]/$tmp
        } elseif {[string match /* $str]} {
        set tmp /$tmp
        }
        regsub -all { } $tmp {\\ } tmp
        set match [linsert $m 0 $tmp]
    } else {
        ## This may look goofy, but it handles spaces in path names
        eval append match $m
        if {[file isdir $match]} {append match /}
        if {[string match ?*/* $str]} {
        set match [file dirname $str]/$match
        } elseif {[string match /* $str]} {
        set match /$match
        }
        regsub -all { } $match {\\ } match
        ## Why is this one needed and the ones below aren't!!
        set match [list $match]
    }
    }
    EvalAttached [list cd $pwd]
    return $match
}

# ::tk::console::ExpandProcname --
#
# Expand a tcl proc name based on $str
#
# Arguments:
#   str - partial proc name to expand
#
# Calls:    ::tk::console::ExpandBestMatch
#
# Returns:  list containing longest unique match followed by all the
#       possible further matches

proc ::tk::console::ExpandProcname str {
    set match [EvalAttached [list info commands $str*]]
    if {[llength $match] == 0} {
    set ns [EvalAttached \
        "namespace children \[namespace current\] [list $str*]"]
    if {[llength $ns]==1} {
        set match [EvalAttached [list info commands ${ns}::*]]
    } else {
        set match $ns
    }
    }
    if {[llength $match] > 1} {
    regsub -all { } [ExpandBestMatch $match $str] {\\ } str
    set match [linsert $match 0 $str]
    } else {
    regsub -all { } $match {\\ } match
    }
    return $match
}

# ::tk::console::ExpandVariable --
#
# Expand a tcl variable name based on $str
#
# Arguments:
#   str - partial tcl var name to expand
#
# Calls:    ::tk::console::ExpandBestMatch
#
# Returns:  list containing longest unique match followed by all the
#       possible further matches

proc ::tk::console::ExpandVariable str {
    if {[regexp {([^\(]*)\((.*)} $str junk ary str]} {
    ## Looks like they're trying to expand an array.
    set match [EvalAttached [list array names $ary $str*]]
    if {[llength $match] > 1} {
        set vars $ary\([ExpandBestMatch $match $str]
        foreach var $match {lappend vars $ary\($var\)}
        return $vars
    } elseif {[llength $match] == 1} {
        set match $ary\($match\)
    }
    ## Space transformation avoided for array names.
    } else {
    set match [EvalAttached [list info vars $str*]]
    if {[llength $match] > 1} {
        regsub -all { } [ExpandBestMatch $match $str] {\\ } str
        set match [linsert $match 0 $str]
    } else {
        regsub -all { } $match {\\ } match
    }
    }
    return $match
}

# ::tk::console::ExpandBestMatch --
#
# Finds the best unique match in a list of names.
# The extra $e in this argument allows us to limit the innermost loop a little
# further.  This improves speed as $l becomes large or $e becomes long.
#
# Arguments:
#   l   - list to find best unique match in
#   e   - currently best known unique match
#
# Returns:  longest unique match in the list

proc ::tk::console::ExpandBestMatch {l {e {}}} {
    set ec [lindex $l 0]
    if {[llength $l]>1} {
    set e  [string length $e]; incr e -1
    set ei [string length $ec]; incr ei -1
    foreach l $l {
        while {$ei>=$e && [string first $ec $l]} {
        set ec [string range $ec 0 [incr ei -1]]
        }
    }
    }
    return $ec
}

# now initialize the console
::tk::ConsoleInit