junegunn/fzf

The prompt appears slowly

og900aero opened this issue · 2 comments

og900aero commented

Checklist

  • I have read through the manual page (man fzf)
  • I have searched through the existing issues
  • For bug reports, I have checked if the bug is reproducible in the latest version of fzf

Output of fzf --version

0.50.0 (f97d275)

OS

  • Linux
  • macOS
  • Windows
  • Etc.

Shell

  • bash
  • zsh
  • fish

Problem / Steps to reproduce

If I put eval "$(fzf --bash)" at the end of .bashrc,
then the prompt appears much slower than without it:

Without eval "$(fzf --bash)": 0.077sec
With eval "$(fzf --bash)": 0.419sec

Personally, I only added the eval "$(fzf --bash)" because of the CTRL+R function.
Maybe there is a special way to implement only the CTRL+R function in it and not need the eval "$(fzf --bash)"? Because then I think it would be possible to speed it up.

junegunn commented

Evaluating fzf --bash does take some time, but 340ms seems a bit too much. Can you measure the exact the time like so?

$ time fzf --bash > /dev/null

real    0m0.021s
user    0m0.003s
sys     0m0.009s
$ time eval "$(fzf --bash)"

real    0m0.051s
user    0m0.021s
sys     0m0.023s

Personally, I only added the eval "$(fzf --bash)" because of the CTRL+R function.

fzf --bash prints both scripts in https://github.com/junegunn/fzf/tree/master/shell. You can strip out the unwanted part as discussed in #3675,

$ time eval "$(fzf --bash | sed -n '/### key-bindings/,/### end/p')"

real    0m0.023s
user    0m0.005s
sys     0m0.012s

or you can just load the individual file (https://github.com/junegunn/fzf/blob/master/shell/key-bindings.bash) instead of using fzf --bash

og900aero commented

Thx for your answer. My values:

$ time fzf --bash > /dev/null

real    0m0.021s
user    0m0.017s
sys     0m0.006s

$ time eval "$(fzf --bash)"

real    0m0.440s
user    0m0.337s
sys     0m0.126s

$ time eval "$(fzf --bash | sed -n '/### key-bindings/,/### end/p')"

real    0m0.059s
user    0m0.035s
sys     0m0.030s

$ time source ~/key-bindings.bash

real    0m0.017s
user    0m0.011s
sys     0m0.007s

So I stay source keybindings.bash file. Thx for your help!
And thank you for your work. fzf is at least as important as a sed or awk command.

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