receive man page

term::receive — General input from terminals

Synopsis

package require Tcl 8.4

package require term::receive ?0.1?

::term::receive::getch ?chan?

::term::receive::listen cmd ?chan?

cmd process string

cmd eof

::term::receive::unlisten ?chan?

Description

This package provides the most primitive commands for receiving characters to a terminal. They are in essence convenient wrappers around the builtin commands read and fileevent.

::term::receive::getch ?chan?
This command reads a single character from the channel with handle chan and returns it as the result of the command.

If not specified chan defaults to stdin.

It is the responsibility of the caller to make sure that the channel can provide single characters. On unix this can be done, for example, by using the command of package term::ansi::ctrl::unix.
::term::receive::listen cmd ?chan?

This command sets up a filevent listener for the channel with handle chan and invokes the command prefix cmd whenever characters have been received, or EOF was reached.

If not specified chan defaults to stdin.

The signature of the command prefix is

cmd process string
This method is invoked when characters were received, and string holds them for processing.
cmd eof
This method is invoked when EOF was reached on the channel we listen on. It will be the last call to be received by the callback.
::term::receive::unlisten ?chan?
This command disables the filevent listener for the channel with handle chan.

If not specified chan defaults to stdin.

Bugs, Ideas, Feedback

This document, and the package it describes, will undoubtedly contain bugs and other problems. Please report such in the category term of the Tcllib Trackers [http://core.tcl.tk/tcllib/reportlist]. Please also report any ideas for enhancements you may have for either package and/or documentation.

Keywords

character input, control, get character, listener, receiver, terminal

Category

Terminal control

Info

0.1 tcllib Terminal control