For those who prefer to manage default options in a file.
If the file is not found, fzf will exit with an error.
We're not setting a default value for it because:
1. it's hard to find a default value that can be universally agreed upon
2. to avoid fzf having to check for the existence of the file even when it's not used
- You would wonder why fzf implements directory traversal anyway when it's a filter program following the Unix philosophy.
But fzf has had [the traversal code for years][walker] to tackle the performance problem on Windows. And I decided to use the same approach on different platforms as well for the benefits listed above.
- Built-in traversal is now done using the excellent [charlievieth/fastwalk][fastwalk] library, which easily outperforms its competitors and supports safely following symlinks.
- Added `$FZF_DEFAULT_OPTS_FILE` to allow managing default options in a file
- See [#3618](https://github.com/junegunn/fzf/pull/3618)