Setting Environment Variable in vimrc

Question

I want to set an environment variable in vimrc. The pseudo code of what I want to do is below

if(file x exists in current directory)
path = get absolute path of file x
env = path

How can I do this in vimrc?

Thanks

Answer 1

XY ing the problem a little bit vim supports the :cscope add command (see help entry :h E563 among others) to control which cscope database is currently in use.

That should be a more direct (and more controllable) method of doing what is desired here.

Answer 2

如果只需要影响Vim中的PATH，就很简单：

:let $PATH=...