This is small proposal to improve erlang navigation when coding. It is a two piece adjustment:

In the Makefile

tags:
        find src include deps -name "*.[he]rl" -print | xargs etags -o TAGS

And in emacs, you can do this:

(defun le2m/erlang-update-tags ()
  (interactive)
  (let ((root (locate-dominating-file default-directory "Makefile")))
    (when root
      (let ((default-directory root))
        (shell-command "gmake tags")
        (message "Tags updated")))))

(advice-add 'erlang-compile :before #'le2m/erlang-update-tags)

When typing C-c C-k, the TAGS file will be “automagically” created

Let’s dive into some new language programming. Functional of course… Erlang!

In Openbsd, did some tweaks into the installation process…

~> doas pkg_add erlang rebar
~> ln -s /usr/local/bin/erl<version> ~/bin/erl # my personal bin directory
~> ln -s /usr/local/bin/rebar<version> ~/bin/rebar

It was not so obvious for me but it seems that rebar is to erlang like leiningen is to clojure. And as such, you can initialize your project quite easily

rebar new umbrella prj-name

Also your first time?

A bit more on rebar

You can see all templates and understand them better with

rebar new help

Now what?

Well, now with the template one can really program in Emacs. I am currently using erlang mode from this instruction. However, my load path was a bit different.

(setq load-path (cons  "/usr/local/lib/erlang<version>/lib/tools-<tools version>/emacs"
		     load-path))
(setq erlang-root-dir "/usr/local/erlang<version>")
(setq exec-path (cons "/usr/local/erlang<version>/bin" exec-path))
(require 'erlang-start)

Once that is fired up, in the *app*.erl file, C-c C-k to compile (quite ciderish… very comfy).

Doubts?

If in doubt with rebar

rebar help <command that clouds your mind>

If in doubt with erlang:

• learn some earlang for the greater good
• erlang official website
• more here in the future =]