Per-language project-search-path, was: Re: Unified project interface

[Dmitry Gutov]

On 07/31/2015 07:13 PM, Stephen Leake wrote:

> The elisp project (depending on current Emacs version) will only want to
> search one of:
>
> (lisp)
> (lisp lisp-emacs-24)
> (lisp lisp-emacs-23)
>
> The Ada project will only want to search the "ada" and "build"
> directories (for the Makefile and Ada project file).

By the way, do you think project-search-path should have a major-mode 
(or language) argument? Or maybe depend on it implicitly, via the 
current buffer?

ede-source-paths dispatches on both PROJECT and MODE; to reuse it (in 
the ede project backend), we'd have to produce the mode argument.

The caveats with the given choices are:

- Users can use different major modes for the same files. Normally, 
project support shouldn't affect that.

- We have no registry of languages, AFAIK. And different languages can 
be spelled differently (C++ vs Cpp, Fortran vs F77, Objective-C vs ObjC).

- Just prescribing to use the current buffer in whatever way the project 
backend wants could be the most flexible, but it doesn't solve either 
difficulty.

We could ask a similar question for project-ignores as well, though I'd 
rather not go that far. It needs a DIRECTORY argument already.