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Prevent multiple prompt resets in one execution cycle #368

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merged 2 commits into from
Nov 22, 2017

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mafredri
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The prompt ends up in a weird state when zle reset-prompt is called multiple times during one execution cycle. This can happen when multiple async tasks finish at nearly the same time. What happened here is that async_process_results called prompt_pure_async_callback multiple
times during it's execution. In turn, prompt_pure_async_callback did multiple calls to zle reset-prompt. My theory is that ZLE ends up in a weird state that is reset after all the current code has completed executing.

This behavior is observable when the prompt "moves upwards" and erases previous lines in the terminal.

Fixes #356.

The prompt ends up in a weird state when `zle reset-prompt` is called
multiple times during one execution cycle. This can happen when multiple
async tasks finish at nearly the same time. What happened here is that
`async_process_results` called `prompt_pure_async_callback` multiple
times during it's execution. In turn, `prompt_pure_async_callback` did
multiple calls to `zle reset-prompt`. My theory is that ZLE ends up in a
weird state that is reset after all the current code has completed
executing.

This behavior is observable when the prompt "moves upwards" and erases
previous lines in the terminal.

Fixes #356.
@sindresorhus sindresorhus merged commit a3b22b2 into master Nov 22, 2017
@sindresorhus sindresorhus deleted the async-render-fix branch November 22, 2017 06:36
@sindresorhus
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Yay. Super happy to have this fixed ✨

ahmedelgabri added a commit to ahmedelgabri/pure that referenced this pull request Dec 20, 2017
* upstream/master:
  Prevent multiple prompt resets in one execution cycle (sindresorhus#368)
  More thorough handling (hiding) of match results
  Avoid implicit creation of global var prompt_pure_git_arrows
  1.6.0
  Link to pure.zsh and async.zsh for better clarity (sindresorhus#358)
  Readme tweaks
  Link to a Pure-inspired prompt done in Rust
  Avoid implicit global var creation and cleanup (sindresorhus#347)
  Fix grammar in readme (sindresorhus#344)
kgrz added a commit to kgrz/pure that referenced this pull request May 1, 2018
* upstream/master: (21 commits)
  Fix wrong placement of localoptions during prompt init
  Fix line erasure when terminal output does not end in newline (sindresorhus#391)
  Try to detech SSH connection when SSH_CONNECTION is unset (sindresorhus#393)
  Always force BatchMode for the Git SSH command (sindresorhus#392)
  1.7.0
  Avoid setting title over serial console (sindresorhus#388)
  Hide virtualenv when explicitly disabled by the user (sindresorhus#381)
  Add install guide for Zplugin (sindresorhus#386)
  Update URL to Droid Sans Mono font (sindresorhus#387)
  Prevent multiple prompt resets in one execution cycle (sindresorhus#368)
  More thorough handling (hiding) of match results
  Avoid implicit creation of global var prompt_pure_git_arrows
  1.6.0
  Link to pure.zsh and async.zsh for better clarity (sindresorhus#358)
  Readme tweaks
  Link to a Pure-inspired prompt done in Rust
  Avoid implicit global var creation and cleanup (sindresorhus#347)
  Fix grammar in readme (sindresorhus#344)
  Update oh-my-zsh instructions in readme
  Remove extra $fpath from npm postinstall fail instructions
  ...
filipekiss added a commit to filipekiss/pure that referenced this pull request Apr 26, 2019
* upstream/master:
  Add pure-pwsh to the ports section of the readme (sindresorhus#467)
  Skip grep fork, use native zsh matching (sindresorhus#459)
  Add pure-now to Ports section in the readme (sindresorhus#458)
  1.9.0
  Update to zsh-async 1.7.1 and recover from unexpected worker death (sindresorhus#454)
  Add conda environment name to precmd (sindresorhus#440)
  Add Mímir to Ports section in the readme (sindresorhus#438)
  Avoid calling zle reset-prompt in precmd (sindresorhus#431)
  Simplify async tasks by not passing $PWD (sindresorhus#430)
  Abort git check if pwd has changed after invocation (sindresorhus#428)
  Update zsh-async to 1.7.0 (sindresorhus#429)
  1.8.0
  Advice against enabling incompatible Oh-My-Zsh plugins
  Show warning when Oh My Zsh themes are enabled (sindresorhus#426)
  Add support for VI-mode indicator (sindresorhus#405)
  Remove unused function for computing string length (sindresorhus#418)
  Update fpath-reference link (sindresorhus#417)
  Prevent IPv6 regexp from capturing the time (sindresorhus#413)
  Prevent hostname from showing up in local X sessions (sindresorhus#398)
  Make sure local HUP trap is unset during git fetch
  Improve the debug prompt (PS4) (sindresorhus#396)
  Show options as a table in readme (sindresorhus#407)
  Remove unfrequent FAQs from readme (sindresorhus#406)
  Prevent interactive prompts during git fetch (sindresorhus#397)
  Set title via atomic print statement (sindresorhus#399)
  Revert local prompt_opts, breaks promptinit
  Fix for setopt not taking effect when sourcing pure
  Fix prompt_pure_state on older versions of zsh
  Fix wrong placement of localoptions during prompt init
  Fix line erasure when terminal output does not end in newline (sindresorhus#391)
  Try to detech SSH connection when SSH_CONNECTION is unset (sindresorhus#393)
  Always force BatchMode for the Git SSH command (sindresorhus#392)
  1.7.0
  Avoid setting title over serial console (sindresorhus#388)
  Hide virtualenv when explicitly disabled by the user (sindresorhus#381)
  Add install guide for Zplugin (sindresorhus#386)
  Update URL to Droid Sans Mono font (sindresorhus#387)
  Prevent multiple prompt resets in one execution cycle (sindresorhus#368)
  More thorough handling (hiding) of match results
  Avoid implicit creation of global var prompt_pure_git_arrows
  1.6.0
  Link to pure.zsh and async.zsh for better clarity (sindresorhus#358)
  Readme tweaks
  Link to a Pure-inspired prompt done in Rust
  Avoid implicit global var creation and cleanup (sindresorhus#347)
kutsan pushed a commit to kutsan/pure that referenced this pull request Jun 19, 2023
* Update zsh-async to 1.6.0 for buffer status indicator

* Prevent multiple prompt resets in one execution cycle

The prompt ends up in a weird state when `zle reset-prompt` is called
multiple times during one execution cycle. This can happen when multiple
async tasks finish at nearly the same time. What happened here is that
`async_process_results` called `prompt_pure_async_callback` multiple
times during it's execution. In turn, `prompt_pure_async_callback` did
multiple calls to `zle reset-prompt`. My theory is that ZLE ends up in a
weird state that is reset after all the current code has completed
executing.

This behavior is observable when the prompt "moves upwards" and erases
previous lines in the terminal.

Fixes sindresorhus#356.
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2 participants