define-command -docstring %{
    move-file <name>: move the file on the filesystem and the open buffer.
} -params 1 move-file %{
    nop %sh{
        old="${kak_bufname}"
        echo "rename-buffer $1 ; write" >$kak_command_fifo
        rm "$old"
    }
}
alias global mv move-file

define-command -docstring %{
    rename-file <name>: rename the file on filesystem and buffer,
    keeping the same directory.
} -params 1 rename-file %{
    nop %sh{
        dir="${kak_buffile%/*}"
        # base="${kak_buffile##/*}"
        new="${dir}/$1"
        echo "rename-buffer $new ; write" >$kak_command_fifo
        rm "$kak_buffile"
    }
}