Mailing List Archive

On 2024-04-10, WordWeaver Evangelist via Python-list <python-list@python.org> wrote:

> I have a simple question. I use the following textPrompt in some of my Jython modules:
> '\nYour choice is? (A B C D E): ', maxChars=1, autoAccept=False, forceUppercase=True)

> Is there a way to add an ANSI color code to the end where the
> conditions are, so that the color of the user’s input is of a color
> of my choosing, instead of just white?

I'm not sure what is meant by "the end where the conditions are", nor
do I know what "textPrompt" refers to.

Are you asking how to put a second escape sequence at the end of the
string literal after the colon?

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On 11/04/24 06:50, WordWeaver Evangelist via Python-list wrote:
> I have a simple question. I use the following textPrompt in some of my Jython modules:
> '\nYour choice is? (A B C D E): ', maxChars=1, autoAccept=False, forceUppercase=True)
> Is there a way to add an ANSI color code to the end where the conditions are, so that the color of the user’s input is of a color of my choosing, instead of just white?
> Thank you very much in advance.
> Kind regards,
> Bill Kochman

Haven't tried using any of theses techniques, but may define input()
color, as well as print():-

How to print colored terminal text in Python
MAR 06, 2024
...
https://byby.dev/py-print-colored-terminal-text

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On 10/04/2024 19:50, WordWeaver Evangelist via Python-list wrote:

> I have a simple question. I use the following textPrompt in some of my Jython modules:
> '\nYour choice is? (A B C D E): ', maxChars=1, autoAccept=False, forceUppercase=True)
> Is there a way to add an ANSI color code to the end

Normally, for any kind of fancy terminal work, I'd say use curses.
But I suspect Jython may not support curses?

On the offchance it does do curses it would look like:

import curses

def main(scr):
if curses.has_colors(): # check the terminal supports color
curses.start_color(). # init the color system
curses.init_pair(1,curses.COLOR_YELLOW,curses.COLOR_BLUE)

# Now start adding text coloring as desired...
scr.addstr(0,0,"This string is yellow and blue",
curses.color_pair(1))

scr.refresh(). # make it visible
else: scr.addstr("Sorry, no colors available")

curses.wrapper(main)

HTH
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Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
http://www.amazon.com/author/alan_gauld
Follow my photo-blog on Flickr at:
http://www.flickr.com/photos/alangauldphotos


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On Thu, 11 Apr 2024 04:50:49 +1000 WordWeaver Evangelist via Python-list
wrote:

>Hello List,
>
>I have a simple question. I use the following textPrompt in some of my Jython modules:
> '\nYour choice is? (A B C D E): ', maxChars=1, autoAccept=False, forceUppercase=True)
>Is there a way to add an ANSI color code to the end where the conditions are, so that the color of the user’s input is of a color of my choosing, instead of just white?
>Thank you very much in advance.
>Kind regards,
>Bill Kochman

Over the years, I've tried different mechanisms for applying colors until
I got my hands on f-stings; then I created a tiny module with all the
colors (cR, cG, etc) which made my life so much simpler (attached). The
module includes background colors (bX); but I very rarely use those.

Then, I just use the module like this:

# place the module in a directory where your script is
# e.g., $ mkdir mymods (rename as desired)
from mymods.colors import *
# or just include the contents inline

# this simply switches from one color to the next
print( f"{cR}red, {cB}blue, {cG}green {cO}are colors." )

# color just the response
ans = input( f"Answer?: {cG}" ) # turn off color on next line
print( f"{cO}You entered: {cY}{ans}{cO}" )
# ^^^^

# to turn off each color (white commas), change the above to:
print( f"{cR}red{cO}, {cB}blue{cO}, {cG}green {cO}are colors." )

On Windows, you'll need to add this *before* using the colors:
import os
if os.name == 'nt': # Only if we are running on Windows
from ctypes import windll
w = windll.kernel32
# enable ANSI VT100 colors on Windows.
w.SetConsoleMode(w.GetStdHandle(-11), 7)

HTH,
Pierre
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On 4/10/2024 6:41 PM, Alan Gauld via Python-list wrote:
> On 10/04/2024 19:50, WordWeaver Evangelist via Python-list wrote:
>
>> I have a simple question. I use the following textPrompt in some of my Jython modules:
>> '\nYour choice is? (A B C D E): ', maxChars=1, autoAccept=False, forceUppercase=True)
>> Is there a way to add an ANSI color code to the end
>
> Normally, for any kind of fancy terminal work, I'd say use curses.
> But I suspect Jython may not support curses?
>
> On the offchance it does do curses it would look like:
>
> import curses
>
> def main(scr):
> if curses.has_colors(): # check the terminal supports color
> curses.start_color(). # init the color system
> curses.init_pair(1,curses.COLOR_YELLOW,curses.COLOR_BLUE)
>
> # Now start adding text coloring as desired...
> scr.addstr(0,0,"This string is yellow and blue",
> curses.color_pair(1))
>
> scr.refresh(). # make it visible
> else: scr.addstr("Sorry, no colors available")
>
> curses.wrapper(main)
>
> HTH

Curses is a C module, and there is a Python interface to it. Jython
would have to find an equivalent Java library. Still, isn't the case
that the terminal color output commands are pretty standard? They could
just be stuck into the output string. Doing more fancy things, like
moving the cursor arbitrarily, probably differ but the OP just mentioned
colors.

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On Wed, 10 Apr 2024 at 18:51, WordWeaver Evangelist via Python-list
<python-list@python.org> wrote:

> I have a simple question. I use the following textPrompt in some of my
> Jython modules:

> '\n [1;33mYour choice is? (A B C D E): ', maxChars=1, autoAccept=False, forceUppercase=True)

> Is there a way to add an ANSI color code to the end where the conditions
> are, so that the color of the user’s input is of a color of my choosing,
> instead of just white?

Hi Bill,

Here's a tutorial:
https://www.lihaoyi.com/post/BuildyourownCommandLinewithANSIescapecodes.html
Note the sentence: "once you print out the special code enabling a color,
the color persists forever until someone else prints out the code for
a different color, or prints out the Reset code to disable it."

Here's a more detailed specification:
https://en.wikipedia.org/wiki/ANSI_escape_code

And here's a conversation:
http://mywiki.wooledge.org/BashFAQ/037
(see the first sentence, and then under the heading "Discussion")
that might help you decide whether this approach will satisy your need in
your particular circumstances of operating system, Python version, and
terminal settings.
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On 2024-04-10, Alan Gauld via Python-list <python-list@python.org> wrote:
> On 10/04/2024 19:50, WordWeaver Evangelist via Python-list wrote:
>
>> I have a simple question. I use the following textPrompt in some of my Jython modules:
>> '\nYour choice is? (A B C D E): ', maxChars=1, autoAccept=False, forceUppercase=True)
>> Is there a way to add an ANSI color code to the end
>
> Normally, for any kind of fancy terminal work, I'd say use curses.

If you want to use the terminal escape sequences provided by terminfo
and ncurses, but don't want to use the ncurses windowing functions,
here are some notes on how to do that:

https://github.com/GrantEdwards/Python-curses-and-terminfo

That too is C-Python oriented, and I don't really know how to do the
same things using Jython.

--
Grant

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Pierre Fortin wrote:

> Over the years, I've tried different mechanisms for applying colors until
> I got my hands on f-stings; then I created a tiny module with all the
> colors (cR, cG, etc) which made my life so much simpler (attached).

Attachments are stripped off in this list.
It would be nice to see this tiny module of yours.
An URL or attach as inline text please.
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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
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On Thu, 11 Apr 2024 05:00:32 +0200 Gisle Vanem via Python-list wrote:

>Pierre Fortin wrote:
>
>> Over the years, I've tried different mechanisms for applying colors until
>> I got my hands on f-stings; then I created a tiny module with all the
>> colors (cR, cG, etc) which made my life so much simpler (attached).
>
>Attachments are stripped off in this list.
>It would be nice to see this tiny module of yours.
>An URL or attach as inline text please.

#!/bin/python
# -*- mode: python; -*-
# Copyright:
# 2024-Present, Pierre Fortin <pf@pfortin.com>
# License:
# GPLv3 or any later version: https://www.gnu.org/licenses/gpl-3.0.en.html
# Created:
# 2023-11-10 Initial script
# Updated:

# Usage: f"{cR}red text {cG}green text{cO}; colors off"
# or: print( cY, "yellow text", cO )

# VT100 type terminal colors
ESC = "\u001b";
# Foreground Colors
_black = f"{ESC}[30m"; _red = f"{ESC}[31m"; _green = f"{ESC}[32m"; _yellow = f"{ESC}[33m"
_blue = f"{ESC}[34m"; _magenta = f"{ESC}[35m"; _cyan = f"{ESC}[36m"; _white = f"{ESC}[37m"
# Background Colors
_black_ = f"{ESC}[40m"; _red_ = f"{ESC}[41m"; _green_ = f"{ESC}[42m"; _yellow_ = f"{ESC}[43m"
_blue_ = f"{ESC}[44m"; _magenta_ = f"{ESC}[45m"; _cyan_ = f"{ESC}[46m"; _white_ = f"{ESC}[47m"

_off = f"{ESC}[0m"
ANSIEraseLine = '\033[2K\033[1G'
EL = ANSIEraseLine # short alias

# Color abbreviations (shortcuts for f-sting use)
cK=_black; cR=_red; cG=_green; cY=_yellow; cB=_blue; cM=_magenta; cC=_cyan; cW=_white; cO=_off
# background colors; use {cO} to turn off any color
bK=_black_; bR=_red_; bG=_green_; bY=_yellow_; bB=_blue_; bM=_magenta_; bC=_cyan_; bW=_white_
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