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https://github.com/elixir-editors/emacs-elixir
Emacs major mode for Elixir
https://github.com/elixir-editors/emacs-elixir
Last synced: about 1 month ago
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Emacs major mode for Elixir
- Host: GitHub
- URL: https://github.com/elixir-editors/emacs-elixir
- Owner: elixir-editors
- Created: 2013-04-03T22:53:59.000Z (over 11 years ago)
- Default Branch: master
- Last Pushed: 2023-06-26T17:40:10.000Z (over 1 year ago)
- Last Synced: 2024-08-02T01:26:19.280Z (4 months ago)
- Language: Emacs Lisp
- Size: 677 KB
- Stars: 446
- Watchers: 25
- Forks: 94
- Open Issues: 41
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- Contributing: CONTRIBUTING.md
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README
[![License GPL 3][badge-license]](http://www.gnu.org/licenses/gpl-3.0.txt)
[](https://github.com/elixir-editors/emacs-elixir/actions)
[](https://elpa.nongnu.org/nongnu/elixir-mode.html)
[](http://stable.melpa.org/#/elixir-mode)
[](http://melpa.org/#/elixir-mode)
> **WARNING**
> There is a built-in Elixir mode with tree-sitter support from Emacs 30+ that can also be used with Emacs 29
> This repository is for an older elixir-mode built with SMIE (Simple Minded Indentation Engine) which is not
> as advanced as tree-sitter for a language like Elixir.
# Elixir Mode
Provides font-locking, indentation and navigation support for the
[Elixir programming language.](http://elixir-lang.org/)
## Installation
`elixir-mode` is available on [NON-GNU ELPA](https://elpa.nongnu.org/),
[MELPA STABLE](https://stable.melpa.org/) and [MELPA](https://melpa.org/).
### Via package.el
`package.el` is the built-in package manager in Emacs.
You can install `elixir-mode` with the following command:
M-x package-install [RET] elixir-mode [RET]
or by adding this bit of Emacs Lisp code to your Emacs initialization file
(`.emacs` or `init.el`):
```el
(unless (package-installed-p 'elixir-mode)
(package-install 'elixir-mode))
```
If the installation doesn't work try refreshing the package list:
M-x package-refresh-contents [RET]
Keep in mind that MELPA packages are built automatically from
the `master` branch, meaning bugs might creep in there from time to
time. Never-the-less, installing from MELPA is the recommended way of
obtaining `Elixir-Mode`.
MELPA Stable contains packages released from our tags.
### Via use-package
Since Emacs 29, `use-package` is a built-in feature. For versions prior to 29
one can also install it from MELPA (and MELPA Stable).
To install elixir-mode using `use-package` one can:
``` elisp
(use-package elixir-mode
:ensure t)
```
## Usage
### Interactive Commands
Command (For the M-x prompt.)
Description
elixir-mode
Switches to elixir-mode.
elixir-mode-open-github
Open the GitHub page for Elixir.
elixir-mode-open-elixir-home
Go to Elixir README in the browser.
elixir-mode-open-docs-master
Open the Elixir documentation for the master.
elixir-mode-open-docs-stable
Open the Elixir documentation for the latest stable release.
elixir-mode-show-version
Print version info for elixir-mode.
### Configuration
Any file that matches the glob `*.ex[s]` or `*.elixir` is
automatically opened in elixir-mode, but you can change this
functionality easily.
```lisp
;; Highlights *.elixir2 as well
(add-to-list 'auto-mode-alist '("\\.elixir2\\'" . elixir-mode))
```
### Keymapping
Keymaps can be added to the `elixir-mode-map` variable.
### Pairing
[Smartparens](https://github.com/Fuco1/smartparens) has direct support for Elixir.
Alternatively, if you want to use `ruby-end-mode`, you can add the following to your `elixir-mode-hook`:
```lisp
(add-to-list 'elixir-mode-hook
(defun auto-activate-ruby-end-mode-for-elixir-mode ()
(set (make-variable-buffer-local 'ruby-end-expand-keywords-before-re)
"\\(?:^\\|\\s-+\\)\\(?:do\\)")
(set (make-variable-buffer-local 'ruby-end-check-statement-modifiers) nil)
(ruby-end-mode +1)))
```
## Notes
This package is tested only with a single version of OTP and 3 versions of Elixir. Please, always report versions
(Emacs, Elixir and Erlang/OTP) when raising issues.
## Elixir Tooling Integration
You can use [web-mode.el](http://web-mode.org) to edit elixir templates (eex files).
[mix.el](https://github.com/ayrat555/mix.el) provides a minor mode for integration with Mix, a build tool that ships with Elixir.
[exunit.el](https://github.com/ananthakumaran/exunit.el) provides `ExUnit` integration.
## Elixir Format
This mode can call mix for formatting code. When inside an elixir buffer, just type `M-x elixir-format`.
To automate that, you can add this command to the `before-save` hook.
``` elisp
;; Create a buffer-local hook to run elixir-format on save, only when we enable elixir-mode.
(add-hook 'elixir-mode-hook
(lambda () (add-hook 'before-save-hook 'elixir-format nil t)))
```
To use a `.formatter.exs` you can either set `elixir-format-arguments` globally to a path like this:
``` elisp
(setq elixir-format-arguments (list "--dot-formatter" "/path/to/.formatter.exs"))
```
or you set `elixir-format-arguments` in a hook like this:
``` elisp
(add-hook 'elixir-format-hook (lambda ()
(if (projectile-project-p)
(setq elixir-format-arguments
(list "--dot-formatter"
(concat (locate-dominating-file buffer-file-name ".formatter.exs") ".formatter.exs")))
(setq elixir-format-arguments nil))))
```
In this example we use [Projectile](https://github.com/bbatsov/projectile) to determine if we are in a project and then set `elixir-format-arguments` accordingly.
Please note that this code snippet may cause unhappiness if there is no `.formatter.exs` file available.
## Tips & Tricks
### Prettify symbols
Emacs supports [font ligatures](https://en.wikipedia.org/wiki/Ligature_(writing)). For enabling it for Elixir
you can add it to your configuration:
``` elisp
(add-hook
'elixir-mode-hook
(lambda ()
(push '(">=" . ?\u2265) prettify-symbols-alist)
(push '("<=" . ?\u2264) prettify-symbols-alist)
(push '("!=" . ?\u2260) prettify-symbols-alist)
(push '("==" . ?\u2A75) prettify-symbols-alist)
(push '("=~" . ?\u2245) prettify-symbols-alist)
(push '("<-" . ?\u2190) prettify-symbols-alist)
(push '("->" . ?\u2192) prettify-symbols-alist)
(push '("<-" . ?\u2190) prettify-symbols-alist)
(push '("|>" . ?\u25B7) prettify-symbols-alist)))
;; Or if you use use-packge
(use-package elixir-mode
:hook (elixir-mode . (lambda ()
(push '(">=" . ?\u2265) prettify-symbols-alist)
(push '("<=" . ?\u2264) prettify-symbols-alist)
(push '("!=" . ?\u2260) prettify-symbols-alist)
(push '("==" . ?\u2A75) prettify-symbols-alist)
(push '("=~" . ?\u2245) prettify-symbols-alist)
(push '("<-" . ?\u2190) prettify-symbols-alist)
(push '("->" . ?\u2192) prettify-symbols-alist)
(push '("<-" . ?\u2190) prettify-symbols-alist)
(push '("|>" . ?\u25B7) prettify-symbols-alist))))
```
### Formatting
If you have issues with the formatter provided by this package, you can try
using the format function of language servers. Elixir-ls supports this.
One way to configure this with `eglot` and `use-package` would be:
``` elisp
(use-package elixir-mode
:hook (elixir-mode . eglot-ensure)
(before-save . eglot-format))
```
### Syntax highlighting for LiveView (and similar techniques for other syntaxes)
When you need different major modes in the SAME buffer, Emacs do not provide a standard way.
There is an external package that can help here by adding more than one major mode called `poly-mode`.
A possible configuration would be:
``` elisp
;; Assumes web-mode and elixir-mode are already set up
;;
(use-package polymode
:mode ("\.ex$" . poly-elixir-web-mode)
:config
(define-hostmode poly-elixir-hostmode :mode 'elixir-mode)
(define-innermode poly-liveview-expr-elixir-innermode
:mode 'web-mode
:head-matcher (rx line-start (* space) "~H" (= 3 (char "\"'")) line-end)
:tail-matcher (rx line-start (* space) (= 3 (char "\"'")) line-end)
:head-mode 'host
:tail-mode 'host
:allow-nested nil
:keep-in-mode 'host
:fallback-mode 'host)
(define-polymode poly-elixir-web-mode
:hostmode 'poly-elixir-hostmode
:innermodes '(poly-liveview-expr-elixir-innermode))
)
(setq web-mode-engines-alist '(("elixir" . "\\.ex\\'")))
```
## History
This mode is based on the [Emacs mode by secondplanet](https://github.com/secondplanet/elixir-mode).
## Contributing
Please read [CONTRIBUTING.md](https://github.com/elixir-editors/emacs-elixir/blob/master/CONTRIBUTING.md) for guidelines on how to contribute to this project.
## License
Copyright © 2011-2017 Samuel Tonini, Matt DeBoard, Andreas Fuchs, secondplanet and [contributors](https://github.com/elixir-editors/emacs-elixir/contributors).
Distributed under the GNU General Public License, version 3
[badge-license]: https://img.shields.io/badge/license-GPL_3-green.svg