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#!/bin/sh
# the next line restarts using wish \
exec wish "$0" "$@"

# rmt --
# This script implements a simple remote-control mechanism for
# Tk applications.  It allows you to select an application and
# then type commands to that application.
#
# SCCS: @(#) rmt 1.10 96/06/24 16:42:38

wm title . "Tk Remote Controller"
wm iconname . "Tk Remote"
wm minsize . 1 1

# The global variable below keeps track of the remote application
# that we're sending to.  If it's an empty string then we execute
# the commands locally.

set app "local"

# The global variable below keeps track of whether we're in the
# middle of executing a command entered via the text.

set executing 0

# The global variable below keeps track of the last command executed,
# so it can be re-executed in response to !! commands.

set lastCommand ""

# Create menu bar.  Arrange to recreate all the information in the
# applications sub-menu whenever it is cascaded to.

frame .menu -relief raised -bd 2
pack .menu -side top -fill x
menubutton .menu.file -text "File" -menu .menu.file.m -underline 0
menu .menu.file.m
.menu.file.m add cascade -label "Select Application" \
        -menu .menu.file.m.apps -underline 0
.menu.file.m add command -label "Quit" -command "destroy ." -underline 0
menu .menu.file.m.apps  -postcommand fillAppsMenu
pack .menu.file -side left

# Create text window and scrollbar.

text .t -relief sunken -bd 2 -yscrollcommand ".s set" -setgrid true
scrollbar .s -command ".t yview"
pack .s -side right -fill both
pack .t -side left

# Create a binding to forward commands to the target application,
# plus modify many of the built-in bindings so that only information
# in the current command can be deleted (can still set the cursor
# earlier in the text and select and insert;  just can't delete).

bindtags .t {.t Text . all}
bind .t <Return> {
    .t mark set insert {end - 1c}
    .t insert insert \n
    invoke
    break
}
bind .t <Delete> {
    catch {.t tag remove sel sel.first promptEnd}
    if {[.t tag nextrange sel 1.0 end] == ""} {
        if [.t compare insert < promptEnd] {
            break
        }
    }
}
bind .t <BackSpace> {
    catch {.t tag remove sel sel.first promptEnd}
    if {[.t tag nextrange sel 1.0 end] == ""} {
        if [.t compare insert <= promptEnd] {
            break
        }
    }
}
bind .t <Control-d> {
    if [.t compare insert < promptEnd] {
        break
    }
}
bind .t <Control-k> {
    if [.t compare insert < promptEnd] {
        .t mark set insert promptEnd
    }
}
bind .t <Control-t> {
    if [.t compare insert < promptEnd] {
        break
    }
}
bind .t <Meta-d> {
    if [.t compare insert < promptEnd] {
        break
    }
}
bind .t <Meta-BackSpace> {
    if [.t compare insert <= promptEnd] {
        break
    }
}
bind .t <Control-h> {
    if [.t compare insert <= promptEnd] {
        break
    }
}
auto_load tkTextInsert
proc tkTextInsert {w s} {
    if {$s == ""} {
        return
    }
    catch {
        if {[$w compare sel.first <= insert]
                && [$w compare sel.last >= insert]} {
            $w tag remove sel sel.first promptEnd
            $w delete sel.first sel.last
        }
    }
    $w insert insert $s
    $w see insert
}

.t tag configure bold -font {Courier 12 bold}

# The procedure below is used to print out a prompt at the
# insertion point (which should be at the beginning of a line
# right now).

proc prompt {} {
    global app
    .t insert insert "$app: "
    .t mark set promptEnd {insert}
    .t mark gravity promptEnd left
    .t tag add bold {promptEnd linestart} promptEnd
}

# The procedure below executes a command (it takes everything on the
# current line after the prompt and either sends it to the remote
# application or executes it locally, depending on "app".

proc invoke {} {
    global app executing lastCommand
    set cmd [.t get promptEnd insert]
    incr executing 1
    if [info complete $cmd] {
        if {$cmd == "!!\n"} {
            set cmd $lastCommand
        } else {
            set lastCommand $cmd
        }
        if {$app == "local"} {
            set result [catch [list uplevel #0 $cmd] msg]
        } else {
            set result [catch [list send $app $cmd] msg]
        }
        if {$result != 0} {
            .t insert insert "Error: $msg\n"
        } else {
            if {$msg != ""} {
                .t insert insert $msg\n
            }
        }
        prompt
        .t mark set promptEnd insert
    }
    incr executing -1
    .t yview -pickplace insert
}

# The following procedure is invoked to change the application that
# we're talking to.  It also updates the prompt for the current
# command, unless we're in the middle of executing a command from
# the text item (in which case a new prompt is about to be output
# so there's no need to change the old one).

proc newApp appName {
    global app executing
    set app $appName
    if !$executing {
        .t mark gravity promptEnd right
        .t delete "promptEnd linestart" promptEnd
        .t insert promptEnd "$appName: "
        .t tag add bold "promptEnd linestart" promptEnd
        .t mark gravity promptEnd left
    }
    return {}
}

# The procedure below will fill in the applications sub-menu with a list
# of all the applications that currently exist.

proc fillAppsMenu {} {
    catch {.menu.file.m.apps delete 0 last}
    foreach i [lsort [winfo interps]] {
        .menu.file.m.apps add command -label $i -command [list newApp $i]
    }
    .menu.file.m.apps add command -label local -command {newApp local}
}

set app [winfo name .]
prompt
focus .t