Re: master 1e3b0f2: Improve doc strings of project.el

[Dmitry Gutov]

On 20.06.2020 13:07, Eli Zaretskii wrote:
> In any case, my proposal was not about the API itself, it was more
> about the implementation of the API.  For example, we could have an
> implementation of the generic project-files API that consulted some
> list instead of asking the VCS or the filesystem to provide the files.

You can of course do this already, in 10 lines or so.

But imagine you did add such a backend where project-files returns an 
arbitrary list of files. And you use it.

How would project-switch-to-buffer consult it? Will it have to call 
project-files now, as opposed to just using project-root as the basis 
for comparison? And then compare buffer-file-name of all file-visiting 
buffers against that list?

That would work for smaller projects, but in large ones project-files is 
not instantaneous, so they will be penalized in performance by such an 
approach. And project-switch-to-buffer should work with all kinds of 
projects.

That also wouldn't solve the problem of non-file-visiting buffers like 
Grep from your example.