Use different tags generator dependent on project language about counsel-etags

[redguardtoo]

See counsel-etags-update-tags-backend in latest code.

(setq counsel-etags-update-tags-backend
      (lambda (src-dir)
        (cond
         ((string-match "myproj1" src-dir)
          (shell-command "rust-tags ~/projs/myproj1"))
         (t
          (counsel-etags-scan-dir-internal src-dir)))))

[Opioid]

When I try the code you provided I get a message about "Wrong number of arguments: (lambda (src-dir) [...]), 0". Any idea what that could mean?
(EDIT: I'm not sure if I updated after your last changes. I will try again tomorrow on that machine.)

Is there a way to try to guess the project languange? E.g. look for Cargo.toml to detect rust or maybe a .counseletags file to make per project configurations?

[Opioid]

It works! Thanks!

I am still interested in a way to handle this in a more generic way, or at least control the settings per project. Do you have any ideas?

[redguardtoo]

Could you give me an example? What's the project directory layout?

[Opioid]

The easiest way I can think of, would be to have something like a .counesl-etags file in the root folder, containing counsel-etags-update-tags-backend = rusty-etags or whatever. Then you could configure on a per project basis from within the project.

Another possibility would maybe be to somehow couple it to the current major-mode. So in my example, if we are in rust-mode then always use the following backend. For another-mode use this-and-that and for all other cases use the default.

I also noticed, that generating the TAGS file the first time indeed works with the specified backend, but subsequent updates don't work for some reason.

Messages-buffer contains this for initial creation:

counsel-etags-scan-dir called => e:/projects/workspace/projects/bud/
Fetching source and metadata ...
Creating tags for: ["bud"] ...

Messages-buffer contains this for updates:

Making tags completion table for e:/projects/workspace/projects/bud/TAGS...done

So maybe it is not calling the same backend?

[redguardtoo]

Use .dir-locals.el, see https://www.gnu.org/software/emacs/manual/html_node/emacs/Directory-Variables.html

counsel-etags-update-tags-backend is used to create tags file. The backend runs every 3 minutes and it's a quiet process.

The last message is output of API tags-completion-table which is NOT used by counsel-etags.

I don't know which 3rd party plugins is using it. Maybe company-etags from company-mode?

[Opioid]

Ok, I can use .dir-locals.el!

Hm. For some reason I thought the TAGS are updated on save as well. If it is always updated after counsel-etags-update-interval, I just wasn't patient enough.