fish-shell/share/functions/__fish_cursor_xterm.fish

function __fish_cursor_xterm -d 'Set cursor (xterm)'
    set -l shape $argv[1]

    switch "$shape"
        case block
            set shape 2
        case underscore
            set shape 4
        case line
            set shape 6
    end
    if contains blink $argv
        set shape (math $shape - 1)
    end
    echo -en "\e[$shape q"
end