wrapper: cd to --cwd earlier

[ocharles]

Currently, if haskell-language-server-wrapper is called with --cwd, a cradle will first be loaded and then the change of working directory will happen. This commit reorders this such that if --cwd is supplied, the very first action is to change directory. This means a cradle will be found with --cwd, rather than the directory that haskell-language-server-wrapper was called in.

[ocharles]

I'm not sure if this is or isn't correct, because it's not clear to me what --cwd is for. I'm using (or abusing) it at the moment because what I want to do is:

• Have my source code in ~/code
• Have a UnionFS file system in ~/code-hls that uses COW to mirror ~/code, but to not actually write changes to ~/code
• Run haskell-language-server while my current working directory is code, but have everything run from within ~/code-hls.

The reason I'm doing this is to try and work around haskell/hie-bios#195. The current behavior is that the hie-bios cradle constantly intereferes with my own cabal calls. I'm trying to sandbox haskell-language-server so it can do what it wants without stepping on my toes.

[ndmitchell]

My personal approach is that --cwd should always be the very first thing done, other than perhaps resolving paths passed on the command line (and even then, its debatable) - therefore I'm in solid agreement with this.

[fendor]

LGTM, thanks!