summaryrefslogtreecommitdiffstats
path: root/library/demos/rmt
blob: 423c4a68204f7005e5ad7413d8315ffb1b4bbb7e (plain)
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
#!/bin/sh
# the next line restarts using wish \
exec wish "$0" ${1+"$@"}

# 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.

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.

. configure -menu [menu .menu]
menu .menu.file
menu .menu.file.apps  -postcommand fillAppsMenu
.menu add cascade  -label "File"  -underline 0  -menu .menu.file
.menu.file add cascade  -label "Select Application"  -underline 0 \
	-menu .menu.file.apps
.menu.file add command  -label "Quit"  -command "destroy ."  -underline 0

# Create text window and scrollbar.

text .t -relief sunken -bd 2 -yscrollcommand ".s set" -setgrid true
scrollbar .s -command ".t yview"
grid .t .s -sticky nsew
grid rowconfigure . 0 -weight 1
grid columnconfigure . 0 -weight 1

# 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 configure -font {Courier 12}
.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 {} {
    set m .menu.file.apps
    catch {$m delete 0 last}
    foreach i [lsort [winfo interps]] {
	$m add command -label $i -command [list newApp $i]
    }
    $m add command -label local -command {newApp local}
}

set app [winfo name .]
prompt
focus .t

# Local Variables:
# mode: tcl
# End: