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Available Glish Clients

The Glish system comes with a very modest number of clients.^15.1 Source code for these clients resides in the clients/ subdirectory of the Glish source tree; installing Glish (see § 16.7, page , below) includes installing these clients, so they are generally available for use.

The available clients will grow with time and contributions are welcome. The clients presently available:

test_client simply copies its arguments to stdout and then reports to stderr the name and value (string representation) of any events it receives.
echo_client ``echoes" back any event it receives, using the same name and value. It also generates an initial echo_args event listing the arguments with which it was invoked (if any).
timer generates events at periodic intervals. timer is invoked with two optional arguments, the flag -oneshot and a floating-point value indicating how long the initial timeout should last. timer waits this many seconds and generates a ready event whose value is the number of seconds it waited. If -oneshot is not specified then timer ``rearms" itself and goes off again after the same number of seconds elapse.
Anytime timer receives an interval event it interprets the event's value as a double value indicating the new timeout period. It then resets its timer and begins waiting for this new period of time. The original setting of -oneshot remains in effect.
If no initial time is specified when timer begins executing then it simply waits until it receives an interval event.
For example, the following generates a ready event approximately every 1.5 seconds:
```
    t := client( "timer", 1.5 )
    whenever t->ready do
        print "timer went off after", $value, "seconds"
```
glishtk makes the Tk widgets available to Glish scripts (see § 11, page ).

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