Add support for `_ZO_FZF_OPTS_FILE` similar to `FZF_DEFAULT_OPTS_FILE`.

[sakkada]

First of all, thank you for such great tool!)

In zoxide/src/cmd/query.rs we have:

    fn get_fzf() -> Result<FzfChild> {
        let mut fzf = Fzf::new()?;
        if let Some(fzf_opts) = config::fzf_opts() {
            fzf.env("FZF_DEFAULT_OPTS", fzf_opts)
        } else {
            fzf.args([
                // Search mode
                "--exact",
                .
                .
                .
            ])
            .enable_preview()
        }
        .spawn()

It will be convenient to have ability to overwrite FZF_DEFAULT_OPTS_FILE for current fzf call within zoxide to allow redefine whole bunch of settings in one file without having a mess in different containers, like in *.bat files, *.sh, .vifmrc, etc.

That way if I want to have different configs for cmd/pwsh/bash/zsh/fish and for vifm, I will just set _ZO_FZF_OPTS_FILE value to desired file paths, configs will be stored in files and managed easily.

[abghim]

Hello, I was hoping for the same feature to be shipped! After seeing this, I just decided to make it myself. Got the feature working on my local.

Could you see if this would work for you? You can build from source here https://github.com/abghim/zoxide before my PR is reviewed by the developers.

git clone https://github.com/abghim/zoxide && cd zoxide
cargo b --release

# export environment variable pointing to your desired file, for example ~/.fzf.zoxide
export _ZO_FZF_OPTS_FILE=~/.fzf.zoxide

# check that fzf recognizes those options
target/release/zoxide query -i # this is the same as `zi`, but zi aliases to whatever `zoxide` is in the path, not to this specific build

Have a great day!