zsh occasionally starts with a spurious % (percent) sign #2244

itscool900 commented 2025年12月21日 11:41:54 +01:00

Foot Version

foot version: 1.25.0 -pgo +ime +graphemes -assertions

TERM environment variable

foot

Compositor Name and Version

river version 0.3.7

Distribution

Void Linux

Terminal multiplexer

No response

Shell, TUI, application

zsh

Server/standalone mode

• Standalone
• Server

Foot config

font=Droid Sans Mono:size=17.5
selection-target=both
[key-bindings]
scrollback-up-line=Page_Up
scrollback-down-line=Page_Down
show-urls-copy=Control+Shift+k

Description of Bug and Steps to Reproduce

Running foot with zsh as your default shell will occasionally start zsh with an inverted % on the first line, followed by the prompt on another. If you start foot as foot zsh -f it will always do this. Apparently, using powerlevel10k with instant prompt is one solution, but I would prefer a hardcoded one.

Relevant logs, stacktraces, etc.

No response

### Foot Version foot version: 1.25.0 -pgo +ime +graphemes -assertions ### TERM environment variable foot ### Compositor Name and Version river version 0.3.7 ### Distribution Void Linux ### Terminal multiplexer _No response_ ### Shell, TUI, application zsh ### Server/standalone mode - [x] Standalone - [x] Server ### Foot config ```ini font=Droid Sans Mono:size=17.5 selection-target=both [key-bindings] scrollback-up-line=Page_Up scrollback-down-line=Page_Down show-urls-copy=Control+Shift+k ``` ### Description of Bug and Steps to Reproduce Running foot with zsh as your default shell will occasionally start zsh with an inverted % on the first line, followed by the prompt on another. If you start foot as `foot zsh -f` it will always do this. Apparently, using powerlevel10k with instant prompt is one solution, but I would prefer a hardcoded one. ### Relevant logs, stacktraces, etc. _No response_

krobelus commented 2025年12月21日 13:45:45 +01:00

confirmed; reduces to

foot -e bash -c 'printf "\e[7m%%\e[0m%'$COLUMNS's\r\r\r\e[Je15%%"; read x'

confirmed; reduces to `foot -e bash -c 'printf "\e[7m%%\e[0m%'$COLUMNS's\r\r\r\e[Je15%%"; read x'`

itscool900 commented 2025年12月21日 14:24:04 +01:00

sorry? what's the thing that reduces to that?

sorry? what's the thing that reduces to that?

dnkl commented 2025年12月21日 15:10:52 +01:00

This pops up every now and then, so there are tons of duplicates... But in short, zsh (along with many other shells) don't handle multiple, rapid size changes at startup correctly. The % is just zsh way of saying there's no newline character, and it's just an artifact of the incorrect resize handling.

There's nothing to fix in foot (foot just reacts to, and passes on, resize events from the compositor), but it would be possible to implement a workaround for this, see #453.

This pops up every now and then, so there are tons of duplicates... But in short, zsh (along with many other shells) don't handle multiple, rapid size changes at startup correctly. The % is just zsh way of saying there's no newline character, and it's just an artifact of the incorrect resize handling. There's nothing to fix in foot (foot just reacts to, and passes on, resize events from the compositor), but it would be possible to implement a workaround for this, see https://codeberg.org/dnkl/foot/issues/453.