Autocomplete known keywords

[gradha]

It is weird that vim knows a set of keywords which have to be highlited, but they are not used for autocompletion when pressing Ctrl+P. Is there any vim option to make these keywords available for Ctrl+P?

[zah]

Hmm, what is bound to your Ctrl+P? Weren't you using the ctrl-p vim plugin?
Depending on how you get your auto-completions, it's possible to achieve what you want in general.

[gradha]

I don't have any binding in my .vimrc for ctrl+p and the only plugins I'm using are nimrod.vim and syntactic. AFAICS the cltr+p completion behaviour is the standard completion I've been getting for ages on all the platforms I've tried and it is a simple string matching search for keywords existing in the current buffer and maybe those included by #include/#import files in c++/objc.

[zah]

First of all, I must mention that nimrod.vim is designed to work with neocomplcache, so anyone who stumbles at this thread should consider using it (or refer to the docs for the most up-to-date recommendation).

Now, vanilla vim can be configured to do something similar to what you want by setting the nimrod syntax file as a dictionary for completion. An example is provided here:
http://vim.wikia.com/wiki/Completion_using_a_syntax_file