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Re: Translate or remove escape codes from stream

From: Thomas Dickey
Subject: Re: Translate or remove escape codes from stream
Date: Mon, 6 Jun 2011 18:24:29 -0400 (EDT)

On Mon, 6 Jun 2011, Jeff Barnes wrote:

A couple of weeks ago, the Bug-ncurses list provided very helpful tips for 
capturing the stderr output from a library and printw'ing it to a WINDOW *.

Some of what I'm getting in the WINDOW * includes stuff like the following:

0:00:10.491677352 ^[[333m18212^[[00m  0x80efa30 ^[[32;01mINFO   ^[[00m ^[[00;01;37;41m 
GST_ELEMENT_FACTORY gstelementfactory.c:403:gst_element_factory_create:^[[00m creating 
element "pipeline"

0:00:10.494354913 ^[[333m18212^[[00m  0x80efa30 ^[[32;01mINFO   ^[[00m ^[[00;01;36m  
GST_PLUGIN_LOADING gstplugin.c:660:gst_plugin_load_file:^[[00m plugin 
"/opt/fsmd/lib/gstreamer-0.10/libgstneonhttpsrc.so" loaded



From gst-launch, the output looks great! Nice colors. No escape codes. But from 
my program, well, I'd like to have human readable text. What would be really 
great is if there were a quick and easy fix to translate the escape codes to 
their ncurses attributes counterparts. But I'd bet that the escape codes are 
different from terminal to terminal and the GST_DEBUG output uses terminfo and 
such to figure out what the escape codes are.

If I can't translate the escape codes in a strait-forward way, the second best 
option would be to just remove them from the string that goes to the window.

Anybody know of code examples to do either?

Most of the strings (at least, most of the ones you'll see) are ANSI-formatted. Something like


There also could be escapes from "col", which are


Also, you can get backspaces.  In vile's utility program "vile-manfilt",
I handled that sort of thing (though it in turn emits markup for vile,
to color things).

Thomas E. Dickey

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