[issue12972] Color prompt + readline
report at bugs.python.org
Tue Sep 13 17:29:32 CEST 2011
New submission from Damian <atagar1 at gmail.com>:
Hi, when using terminal coloring codes (for instance '\x1b[32mhello world\x1b[0m' for a green 'hello world') the raw_input function and readline module behave well except under a very specific use case...
import readline # provides history via up/down
prompt = '\x1b[32m>>> \x1b[0m' # green '>>> ' prompt
This provides a green prompt and up/down cycles through prior input. This works well as long as the input is shorter than the prompt string length (in this case 13 characters). However, if the input is longer than the prompt then up/down thinks that the first thirteen rendered characters now belong to the prompt. For instance...
atagar at fenrir:~/Desktop/arm$ python tmp.py
Press up, then down to get back to a blank prompt. You'll have...
This is probably due to a len() check on the raw_input argument...
>>> len('>>> http://do')
>>> len('\x1b[32m>>> \x1b[0m')
I'm at a bit of a loss for investigating this further - help would be appreciated! -Damian
title: Color prompt + readline
versions: Python 2.6
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