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Re: How to Add ANSI Color to User Response

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From: cs@cskk.id.au (Cameron Simpson)
Newsgroups: comp.lang.python
Subject: Re: How to Add ANSI Color to User Response
Date: Fri, 12 Apr 2024 07:41:05 +1000
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by: Cameron Simpson - Thu, 11 Apr 2024 21:41 UTC

On 10Apr2024 23:41, Alan Gauld <learn2program@gmail.com> wrote:
>Normally, for any kind of fancy terminal work, I'd say use curses.

My problem with curses is that it takes over the whole terminal - you
need to manage everything from that point on. Great if you want it (eg
some full-terminal tool like `top`) but complex overkill for small
interactive (or not interactive) commands which are basicly printing
lines of text. Which is what many of my scripts are.

That said, you don't _have_ to use curses to run the whole terminal. You
can use it to just look up the terminal capabilities and use those
strings. I haven't tried that for colours, but here's some same code
from my `cs.upd` module using curses to look up various cursor motion
type things:

... up the top ...
try:
import curses
except ImportError as curses_e:
warning("cannot import curses: %s", curses_e)
curses = None

... later we cache the available motions ...
try:
# pylint: disable=no-member
curses.setupterm(fd=backend_fd)
except TypeError:
pass
else:
for ti_name in (
'vi', # cursor invisible
'vs', # cursor visible
'cuu1', # cursor up one line
'dl1', # delete one line
'il1', # insert one line
'el', # clear to end of line
):
# pylint: disable=no-member
s = curses.tigetstr(ti_name)
if s is not None:
s = s.decode('ascii')
self._ti_strs[ti_name] = s

... then a method to access the cache ...
def ti_str(self, ti_name):
''' Fetch the terminfo capability string named `ti_name`.
Return the string or `None` if not available.
'''
return self._ti_strs.get(ti_name, None)

... and even later, use the method ...
# emit cursor_up
cursor_up = self.ti_str('cuu1')
movetxts.append(cursor_up * (to_slot - from_slot))

Generally, when I add ANSI colours I do it via a little module of my
own, `cs.ansi_colour`, which you can get from PyPI using `pip`.

The two most useful items in it for someone else are probably
`colourise` and `colourise_patterns`. Link:
https://github.com/cameron-simpson/css/blob/26504f1df55e1bbdef00c3ff7f0cb00b2babdc01/lib/python/cs/ansi_colour.py#L96

I particularly use it to automatically colour log messages on a
terminal, example code:
https://github.com/cameron-simpson/css/blob/26504f1df55e1bbdef00c3ff7f0cb00b2babdc01/lib/python/cs/logutils.py#L824

* * * * * THIS TERMINAL IS IN USE * * * * *

devel / comp.lang.python / Re: How to Add ANSI Color to User Response

Subject	Author
Re: How to Add ANSI Color to User Response	Cameron Simpson