set GUI font inside function

Hi everyone,

I'm not sure that's right way to do this, but here's the thing. I want to switch my Vim between dark scheme and light scheme. However, the `colorscheme` is not the only thing that should be switched. I want to switch the font, and indent guides color as well. So I've came up with this function:

    fun! DarkScheme()

        colorscheme molokai

        set gfn=Monaco\ 10

        call DarkIndentGuides()

    endf

But when I'm using external monitor, I want my font to be bigger than 10. So I want to pass the font size as parameter. I've tried

    fun! DarkScheme(n)

        colorscheme molokai

        set gfn="Monaco ".a:n

        " and set gfn="Monaco\ ".a:n 

        " and also set gfn=Monaco\ a:n

        call DarkIndentGuides()

    endf

but it's not working. It ignores the font size in any of these examples. How do I do that? Thanks!

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