prompt-toolkit / prompt-toolkit/python-prompt-toolkit
prompt, with completer, causes line state Wonkiness on Windows 10 when scroll buffer isn't empty
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bug
- Dominant language
- Python
- Stars
- 10.6k
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Description
Isn't completely clear if this is a prompt issue or not, but here's the repro:
- Fire up command prompt, ensure it's using the new conhost (Use legacy console not selected).
- Insert a bunch of stuff into the scroll buffer and ensure window scrolls a bit down before continuing
- Using the toolkit API, prompt for input with a completer attached
- Specify input
- Note line state starts to get Wonky(tm) after a few inputs (1 or more). May need to repeat steps 2-4 a few more times.
Animated gif showing me simplying typing A-E, hitting enter between each letter.
And the sample code
from prompt_toolkit import prompt
from prompt_toolkit.contrib.completers import WordCompleter
import sys
for i in range(50):
print('--Scroll buffer filler--');
print('--End of scroll buffer filler--');
for i in range(5):
html_completer = WordCompleter(['<html>', '<body>', '<head>', '<title>'])
text = prompt('Prompt #%i: ' % i, completer = html_completer)
print('Answer #%i: %s' % (i, text))
Contributor guide
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by running the supplied Python sample using prompt and WordCompleter on Windows 10 with the new conhost and a non-empty scroll buffer. Reproduce the line-state corruption across repeated prompts, then verify that typing and completing input remains stable after the scroll buffer is populated.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- cli, operating-systems
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 35/100