How to tell which colorscheme a Vim session currently uses

Question

You can set the Vim color scheme by issuing

:colorscheme SCHEME_NAME

but, oddly enough, you can\'t get the currently used scheme by is

Answer 1

There's no guaranteed way (as a colour scheme is essentially a load of vim commands that are sourced). However, by convention there should be a variable g:colors_name that is set to the name of the colour scheme.

Therefore, try this:

echo g:colors_name

If you get E121, it's either a poorly made colour scheme or it's the default one.

A shinier way of doing this is (for recent versions of vim):

function! ShowColourSchemeName()
    try
        echo g:colors_name
    catch /^Vim:E121/
        echo "default"
    endtry
endfunction

Then do:

:call ShowColourSchemeName()

If it says "default", do :colorscheme default and see if the colours change. If they do, you're using a malformed colour scheme and there's not a lot you can do about it other than manually switching themes until you recognise it.

The variable g:colors_name is documented here:

:help colorscheme