Certain prompts do not display correctly in the console

[csgillespie]

System details:

Positron and OS details:

Positron Version: 2025.03.0 build 116
Code - OSS Version: 1.96.0
Commit: 7f0f938
Date: 2025-03-01T18:48:08.166Z
Electron: 32.2.6
Chromium: 128.0.6613.186
Node.js: 20.18.1
V8: 12.8.374.38-electron.0
OS: Linux x64 6.8.0-52-generic

Interpreter details:

R 4.4.0 (it's been a problem for a few versions, but I finally figured out what the issue was)

Describe the issue:

The prompt doesn't like "-" in the name (see images)

Steps to reproduce the issue:

# Sets the prompt as you would expect
prompt::set_prompt("update >")
prompt::set_prompt("update-thing >")

# Adds an additional line break - I think it's the "n" not being escaped?
prompt::set_prompt("update-news >")

Expected or desired behavior:

Were there any error messages in the UI, Output panel, or Developer Tools console?

[isabelizimm]

Thanks for the report! I was able to reproduce this as well. Curiously, Positron seems to respect the first time there is a - in the prompt, it is only the following changes that add the extra newlines.

[softwarenerd]

This is a weird bug. I've reproduced it in R 4.4.3. It doesn't appear to be limited to the use of a dash in the prompt. Several non-alphabetic characters result in the same issue. For example:

There is nothing wrong with the prompt that is coming from the R runtime. It looks correct.

[softwarenerd]

The real issue has nothing to do with the '-' character. Prompts of a certain length containing certain characters were the issue. For example, the following prompts will reproduce the issue:

prompt::set_prompt("word word >")
prompt::set_prompt("update-thing >")
prompt::set_prompt("update-news >")