0intro man page on Inferno
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INTRO(9) INTRO(9)
NAME
intro - introduction to Inferno Tk
DESCRIPTION
This section of the manual provides a reference for the Inferno Tk
implementation, which is accessed by Limbo programs via tk(2), and from
sh(1) via sh-tk(1).
The following pages were derived by Vita Nuova from documentation that
is
Copyright © 1990 The Regents of the University of California
Copyright © 1994-1996 Sun Microsystems, Inc.
See copyright(9) for the full copyright notice.
The format of the pages has changed to follow the format of the rest of
this manual, but more important, the content has been changed (typi‐
cally in small ways) to reflect the variant of Tk implemented by
Inferno.
Programming Interface
The interface to Inferno Tk is exclusively through the tk(2) module;
all the Tk commands described in this section of the manual are exce‐
cuted by passing them as strings to the cmd function in that module.
The Inferno Tk implementation is based on the Tk 4.0 documentation, but
there are many differences, probably the greatest of which is that
there is no associated Tcl implementation, so almost every Inferno
application using Tk will need to have some Limbo code associated with
it (the sh-tk(1) shell module can also fulful this rôle). See ``An
Overview of Limbo/Tk'' in Volume 2 for a tutorial-style introduction to
the use of Inferno Tk which summarises the differences from Tk 4.0.
Tk Commands
The command string passed to tk->cmd may contain one or more Tk com‐
mands, separated by semicolons. A semicolon is not a command separator
when it is nested in braces ({}) or brackets ([]) or it is escaped by a
backslash (\). Each command is divided into words: sequences of char‐
acters separated by one or more blanks and tabs.
There is also a `super quote' convention: at any point in the command
string a single quote mark (') means that the entire rest of the string
should be treated as one word.
A word beginning with an opening brace ({) continues until the balanc‐
ing closing brace (}) is reached. The outer brace characters are
stripped. A backslash can be used to escape a brace in this context.
Backslash characters not used to escape braces are left unchanged.
A word beginning with an opening bracket ([) continues until the bal‐
ancing closing bracket (]) is reached. The enclosed string is then
evaluated as if it were a command string, and the resulting value is
used as the contents of the word.
Single commands are executed in order until they are all done or an
error is encountered. By convention, an error is signaled by a return
value starting with an exclamation mark (!). The return value from
tk->cmd is the return value of the first error-producing command or
else the return value of the final single command.
To execute a single command, the first word is examined. It must either
begin with dot (.) in which case it must name an existing widget,
which will interpret the rest of the command according to its type, or
one of the following words, each of which is documented in a manual
page of that name in this section:
bind focus lower scrollbar
button frame menu see
canvas grab menubutton send
checkbutton grid pack text
cursor image radiobutton update
destroy label raise variable
entry listbox scale
Widget Options
Each manual page in this section documents the options that a particu‐
lar command will accept. A number of options are common to several of
the widgets and are named as ``standard options'' near the beginning of
the manual page for each widget. These options are documented in
options(9). The types of value required as arguments to options within
Inferno Tk are documented under types(9).
SEE ALSO
options(9), types(9), tk(2), sh-tk(1), tkcmd(1), wmlib(2), draw-
intro(2), ``An Overview of Limbo/Tk'' in Volume 2.
BUGS
The bracket ([]) command interpretation is not applied consistently
throughout the Inferno Tk commands (notably, the argument to the
send(9) command will not interpret this correctly). Moreover, if the
string to be substituted is significantly bigger than the command it
was substituting, then it will be truncated.
INTRO(9)
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