grab the output of command complete (C-D)

I am almost sure I was able to do this...

Example:

:colo <C-D>

shows the available colorschemes.

If I want to have them in a variable,

redir @a

colo ^D
redir END

does not work, in any variation of colo ^D I tried

(exe 'colo ^D', exe 'colo <C-D>', etc).

Help?

--

Renato Fabbri

Computer Science, ICMC-USP

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