Re: Prompt messed up if PS1 contains ANSI escape sequences

[alex xmb ratchev]

u have to \[ esc-seq \]
eg inside \[ and \]

PS1=$'\u\[\e[1m\]\h\[\e[0m- '

should display hostname bold

On Thu, Sep 7, 2023, 14:55 Gioele Barabucci <gioele@svario.it> wrote:

> Bash 5.2.15 (Debian 12) will produce erroneous output when PS1 contains
> escape sequences. It will also misplace the cursor and corrupt the state
> of the current line.
>
> To replicate this issue:
>
> 1. Modify PS1 to contain one or more ANSI escape sequences, for example
> "\e[45m" (tput setab 5, changes the background color to purple) or
> "\e(B\e[m" (tput sgr0, reset for xterm terminals):
>
>      $ PS1="x$(printf '\e(B\e[m') \\\$ "
>
> 2. Press the up arrow to recall the last command. The command line will
> now show [■ indicates the position of the cursor]:
>
>      x $ PS1="x$(printf '\e(B\e[m') \\\$ "■
>
> 3. Press the down arrow to go back to the empty prompt.
>
> What one should see at this point is just the prompt
>
>      x $ ■
>
> Instead, left-overs from the recalled line will be visible and the
> cursor will be placed in the wrong spot:
>
>      x $ PS1="x■
>
> The amount of garbage left on the prompt is proportional to the number
> of escape sequences:
>
> PS1="x$(printf '\e(B\e[m')\\\$ " => 6 left-over chars
> PS1="x$(printf '\e(B\e[m%.0s' {1..2})\\\$ " => 12 left-over chars
> PS1="x$(printf '\e(B\e[m%.0s' {1..4})\\\$ " => 24 left-over chars
>
> Tested with TERM = linux, xterm, xterm-256color.
>
> Regards,
>
> (This bug has also been reported at <https://bugs.debian.org/1051388>.)
>
> --
> Gioele Barabucci
>
>