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I recently tweaked a bit my PS1. The code as follows:

PS1='$(if [[ $? != 0 ]]; then echo " \e[91m\e[0m"; fi) \u $(assemble_prompt)$ '

The missing char is from nerd-fonts and doesn't matter in my question (as well as assemble_prompt function).

The problem I encountered is a broken PS1 when I shrink terminal window size to the size of a prompt (approx.). Then it seem to ignore PS1 setting and sets PS1 to $ chars only (see screenshot). Note then when I start typing it simply overrides my custom prompt in this occasion.

PS1 went bananas

I narrowed the problem to an if clause that adds "fail" char if previous command was unsuccessful. If I remove that part everything works as expected.

Is there a way to keep if clause part but fix the issue with PS1 reset when the window size is too small?

P.S. I use rxvt-unicode as my terminal but the problem persists in all other terminals also (tested xterm, st).

1 Answer 1

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You probably want to enclose the terminal control codes in \[...\] to tell Bash that they aren't actually printing characters. Otherwise they will confuse the shell when tries to count how wide the prompt is.

So use "\[\e[91m\]xxx\[\e[0m\]".

From the manual:

\[  Begin a sequence of non-printing characters. 
    This could be used to embed a terminal control sequence into the prompt.
\]  End a sequence of non-printing characters.
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  • Damn, that fixed the problem. Thanks! I missed that point about making them not printable.
    – ddnomad
    Apr 9, 2017 at 16:50

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