Moving to Doom Emacs!

.emacs.d/modules/lang/elixir/README.org

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+#+TITLE: lang/elixir
+#+DATE:  June 24, 2019
+#+SINCE: v2.0.9
+
+* Table of Contents :TOC_3:noexport:
+- [[#description][Description]]
+  - [[#module-flags][Module flags]]
+  - [[#plugins][Plugins]]
+- [[#prerequisites][Prerequisites]]
+  - [[#install-elixir][Install Elixir]]
+    - [[#with-asdf][With ~asdf~]]
+    - [[#arch-linux][Arch Linux]]
+    - [[#gentoo-linux][Gentoo Linux]]
+    - [[#opensuse][openSUSE]]
+- [[#features][Features]]
+
+* Description
+This module provides support for [[https://elixir-lang.org/][Elixir programming language]] via [[https://github.com/tonini/alchemist.el][alchemist.el]]
+or [[https://github.com/JakeBecker/elixir-ls/][elixir-ls]].
+
+** Module flags
++ ~+lsp~ Enable LSP support. Requires [[https://github.com/JakeBecker/elixir-ls/][elixir-ls]].
+
+** Plugins
++ [[https://github.com/elixir-editors/emacs-elixir][elixir-mode]]
++ [[https://github.com/tonini/alchemist.el][alchemist.el]]
++ [[https://github.com/aaronjensen/flycheck-credo][flycheck-credo]]
+
+* Prerequisites
+You should have Elixir installed, for example, via your distribution's package
+manager or a version management tool such as [[https://github.com/asdf-vm/asdf-elixir][asdf]].
+
+If you want to add support for LSP ([[modules/tools/lsp][:tools lsp]]), be sure to install [[https://github.com/JakeBecker/elixir-ls/][elixir-ls]]
+and enable ~:tools lsp~ in your ~init.el~.
+
+To support linting with [[https://github.com/rrrene/credo][credo]], add ~:tools flycheck~ to your ~init.el~
+** Install Elixir
+*** With ~asdf~
+#+BEGIN_SRC sh
+asdf plugin-add elixir
+asdf install elixir 1.9.1
+#+END_SRC
+*** Arch Linux
+#+BEGIN_SRC sh :dir /sudo::
+sudo pacman -S elixir
+#+END_SRC
+*** Gentoo Linux
+#+BEGIN_SRC sh :dir /sudo::
+sudo emerge -v dev-lang/elixir
+#+END_SRC
+
+*** openSUSE
+#+BEGIN_SRC sh :dir /sudo::
+sudo zypper install elixir
+#+END_SRC
+* Features
+- Code completion (~:completion company~)
+- Documentation lookup (~:tools lookup~)
+- Mix integration
+- Phoenix support
+- ~iex~ integration (~:tools eval~)
+- Syntax checking (~:tools flycheck~, using [[https://github.com/aaronjensen/flycheck-credo][flycheck-credo]]~)

.emacs.d/modules/lang/elixir/config.el

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+;;; lang/elixir/config.el -*- lexical-binding: t; -*-
+
+(after! projectile
+  (add-to-list 'projectile-project-root-files "mix.exs"))
+
+
+;;
+;;; Packages
+
+(use-package! elixir-mode
+  :defer t
+  :init
+  ;; Disable default smartparens config. There are too many pairs; we only want
+  ;; a subset of them (defined below).
+  (provide 'smartparens-elixir)
+  :config
+  (set-pretty-symbols! 'elixir-mode
+    ;; Functional
+    :def "def"
+    :lambda "fn"
+    ;; :src_block "do"
+    ;; :src_block_end "end"
+    ;; Flow
+    :not "!"
+    :in "in" :not-in "not in"
+    :and "and" :or "or"
+    :for "for"
+    :return "return" :yield "use")
+
+  ;; ...and only complete the basics
+  (sp-with-modes 'elixir-mode
+    (sp-local-pair "do" "end"
+                   :when '(("RET" "<evil-ret>"))
+                   :unless '(sp-in-comment-p sp-in-string-p)
+                   :post-handlers '("||\n[i]"))
+    (sp-local-pair "do " " end" :unless '(sp-in-comment-p sp-in-string-p))
+    (sp-local-pair "fn " " end" :unless '(sp-in-comment-p sp-in-string-p)))
+
+  (when (featurep! +lsp)
+    (add-hook 'elixir-mode-local-vars-hook #'lsp!))
+
+  (use-package! flycheck-credo
+    :when (featurep! :tools flycheck)
+    :config (flycheck-credo-setup)))
+
+
+(use-package! alchemist
+  :hook (elixir-mode . alchemist-mode)
+  :init
+  (after! elixir-mode
+    (set-lookup-handlers! 'elixir-mode
+      :definition #'alchemist-goto-definition-at-point
+      :documentation #'alchemist-help-search-at-point)
+    (set-eval-handler! 'elixir-mode #'alchemist-eval-region)
+    (set-repl-handler! 'elixir-mode #'alchemist-iex-project-run)))
+
+
+(use-package! alchemist-company
+  :when (featurep! :completion company)
+  :commands alchemist-company
+  :init
+  (after! elixir-mode
+    (set-company-backend! 'elixir-mode '(alchemist-company company-yasnippet)))
+  :config
+  ;; Alchemist doesn't use hook symbols to add these backends, so we have to use
+  ;; the entire closure to get rid of it.
+  (let ((fn (byte-compile (lambda () (add-to-list (make-local-variable 'company-backends) 'alchemist-company)))))
+    (remove-hook 'alchemist-mode-hook fn)
+    (remove-hook 'alchemist-iex-mode-hook fn)))

.emacs.d/modules/lang/elixir/packages.el

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+;; -*- no-byte-compile: t; -*-
+;;; lang/elixir/packages.el
+
+;; +elixir.el
+(package! elixir-mode)
+(package! alchemist)
+(when (featurep! :tools flycheck)
+  (package! flycheck-credo))