terminal output reappears after clearing the element

Open Beginner friendly

#913 opened on Aug 26, 2026 0 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 2/5
Estimated time: 1-3 hours
Newbie friendliness: 84/100

Issue type: Bug
Clarity: Clearly specified
Activity status: Active
Tech stack: javascript, python
Domain: frontend, web-dev

Research direction

Start in transcrypt/modules/org/transcrypt/runtime.py at the Terminal implementation and the module-level print/input bindings linked in the issue. Check how init sets the element and how output rewrites it from self.buffer. Done means a clear() method resets both buffer and displayed content so later output does not restore stale text.

Written by the indexing model from the issue text.

Description

Problem

Output written to __terminal__ cannot be cleared. Clearing the target element from application code removes the rendered text only. The next print puts everything back.

Cause

__Terminal__ keeps the output history in self.buffer and rewrites the whole element from that buffer on every call:

https://github.com/TranscryptOrg/Transcrypt/blob/32b216bcd3cb08c81645528c1a108a78be0b2325/transcrypt/modules/org/transcrypt/__runtime__.py#L284-L288

The class offers no method to reset self.buffer. Replacing the module-level instance does not help either, because print and input are bound to the original instance when the runtime module is loaded:

https://github.com/TranscryptOrg/Transcrypt/blob/32b216bcd3cb08c81645528c1a108a78be0b2325/transcrypt/modules/org/transcrypt/__runtime__.py#L301-L304

Proposed fix

Add a clear() method that resets buffer and element together, so the buffer cannot restore stale output:

    def clear (self):
        self.buffer = ''

        if self.element:
            self.element.innerHTML = '_'

'_' is the initial content written by __init__, so clear() returns the terminal to its start state.

Workaround

Reset both parts by hand:

__terminal__.buffer = ''
__terminal__.element.innerHTML = ''

Version

Transcrypt 3.9.5

Contribution

I am happy to write the pull request for this change if the proposed approach is acceptable.

Dominant language: Python
Stars: 2.9k
Forks: 218
PR merge metrics: No merged PRs in 30d

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__terminal__ output reappears after clearing the element