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From: sdl@MITRE-BEDFORD.ARPA (Litvintchouk)
Newsgroups: net.emacs
Subject: Question of curiosity: who is still buying Unipress or CCA?
Message-ID: <8610051531.AA26585@mitre-bedford.ARPA>
Date: Sun, 5-Oct-86 11:31:25 EDT
Article-I.D.: mitre-be.8610051531.AA26585
Posted: Sun Oct  5 11:31:25 1986
Date-Received: Tue, 7-Oct-86 19:36:23 EDT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The MITRE Corp., Bedford, MA
Lines: 44


> Unipress also seems to be one or two steps ahead of Gnu when it comes to
> features like process control.  Recent versions of Unipress allow you to do
> things like run background processes and specify arbitrary pieces of MLisp
> code to be called whenever the process changes state.  I use this facility to
> compile programs and -- when the compilation is finished -- scan the error log
> buffer for certain "standard" error messages, fix the code involved, and
> restart the compilation.  All while I work on other things.

GNU Emacs has all these features too.  Examples (taken from the "help"
documentation):  

set-process-sentinel:
Give PROCESS the sentinel SENTINEL; nil for none.
The sentinel is called as a function when the process changes state.

set-process-filter:
Give PROCESS the filter function FILTER; nil means no filter.
When a process has a filter, each time it does output
the entire string of output is passed to the filter.

compile:
Compile the program including the current buffer.  Default: run `make'.
Runs COMMAND, a shell command, in a separate process asynchronously
with output going to the buffer *compilation*.
You can then use the command C-x ` to find the next error message
and move to the source code that caused it.


Even more importantly, processes, windows and buffers are all treated
as "first-class citizens" in GNU Emacs.  Thus, you can create complex
data structures containing processes, windows and/or buffers as atomic
objects.  This feature has tremendous potential for programming new
applications.


Steven Litvintchouk
MITRE Corporation
Burlington Road
Bedford, MA  01730
(617)271-7753

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