Question

I have this in my .vimrc:

augroup filetype_colorscheme
        au BufEnter *
        \ if !exists('b:colors_name')
            \ | if &ft == "vim"
                \ | let b:colors_name = 'color_dark'
            \ | else
                \ | let b:colors_name = 'color_light'
            \ | endif
        \ | endif
        \ | exe 'colorscheme' b:colors_name
augroup END 

What it does:
When I open a .vim page it opens my dark colorscheme “color_dark.vim”
when I open whatever other page it opens my light colorscheme “color_light.vim”

This is very nice but it is not so nice in split windows.
Every time when I click in a split window with p.e. a text file, all split windows become light colored with the light colorscheme (even the .vim files).
When I switch to a vim file in a split window all other files in the other split windows become dark as well.

Is it possible to retain every filetype his own colorscheme in a split window?
What do I have to change in above code?

EDIT
If this is not possible would it be possible to disable above code when I enter in a split window? (in order to let me choose the colorscheme myself, the same for all split windows)

Answer 1

Colorschemes will always affect the entire vim instance. It is not possible to have a different color scheme per split window.

Edit 1: To answer your second question in the edit, you can probably add && winnr('$') == 1 to that first if to stop this from happening when you have multiple split windows open.

Edit 2: Whoops, the edit above would not work, however I think wrapping everything in another if should.

Edit 3: Missed a couple of pipes.

augroup filetype_colorscheme
        au BufEnter *
        \ | if winnr('$') == 1
                \ if !exists('b:colors_name')
                    \ | if &ft == "vim"
                        \ | let b:colors_name = 'color_dark'
                    \ | else
                        \ | let b:colors_name = 'color_light'
                    \ | endif
                \ | endif
                \ | exe 'colorscheme' b:colors_name
        \ | endif
augroup END