Persistent history (MRU files, :cmd's)?

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I’m using a similar hook which handles everything in one command:

hook global BufCreate [^*].* %{
    nop %sh{
        mru=~/.cache/kak-mru
        echo "$kak_buffile" | awk '!seen[$0]++' - "$mru" | sponge "$mru"
    }
}

I then execute this script from kakoune to get a list of files in fzf (uses kakoune.cr):

~ > cat .local/bin/kcr-fzf-mru
#!/bin/sh
# Jump to recent file in Kakoune.

kcr edit "$(fzf < ~/.cache/kak-mru)"
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