Export lem-base::*current-buffer*?

[kchanqvq]

What is the current way to temporarily change (current-buffer) (like with-current-buffer in Emacs)? Although setter to current-buffer is exported, implementing with-current-buffer using the setter is not thread-safe. The best way seems to be just bind *current-buffer*, however currently it is internal to lem-base which suggest it is only used for internal implementation. Can we export this symbol instead?

[cxxxr]

I believe that active use of dynamic scopes should be avoided except in a few cases, such as testing.
I don't think dynamic scope is necessary since the operator provided by lem explicitly specifies the arguments, but what kind of case is there?

[kchanqvq]

I agree with you from language design view point, that one should pass buffer as argument (conveniently packaged in point objects) in favor of with-current-buffer and current-buffer. Being said that, lem already provides and exports current-buffer which seems mostly useful to the coding style that relies on current buffer as a dynamic context. Then it might as well export something equivalent to with-current-buffer.

The concrete use case is that I'm writing a compatibility layer to run Emacs Lisp directly on lem. I have got surprisingly far! Lem design seems to follow very closely to that of Emacs. (I'm not familiar with the design process of lem, is this intended?) I've ported quite a few Emacs functions relying on current-buffer, and I also need to port with-current-buffer. I can do still do that if lem-base::*current-buffer* is not exported -- I just need to maintain my own el-compat:*current-buffer* instead, but I find this awkward given that there's already lem-base:current-buffer and lem-base::*current-buffer*.

[cxxxr]

I see.
well, maybe it might be good idea to provide a with-current-buffer macro.