isabella232 / editorconfig-emacs

EditorConfig plugin for Emacs

EditorConfig Emacs Plugin

This is an EditorConfig plugin for Emacs.

Getting Started

Install from MELPA

This package is available from MELPA and MELPA Stable. Install from these repositories and enable global minor-mode editorconfig-mode:

(editorconfig-mode 1)

Normally, enabling editorconfig-mode should be enough for this plugin to work: all other configurations are optional. This mode sets up hooks so that EditorConfig properties will be loaded and applied to the new buffers automatically when visiting files.

use-package

If you use use-package, add the following to your init.el file:

(use-package editorconfig
  :ensure t
  :config
  (editorconfig-mode 1))

Manual installation

Copy all .el files in this repository to ~/.emacs.d/lisp and add the following:

(add-to-list 'load-path "~/.emacs.d/lisp")
(require 'editorconfig)
(editorconfig-mode 1)

Supported properties

Current Emacs plugin coverage for EditorConfig's properties:

• indent_style
• indent_size
• tab_width
• end_of_line
• charset
• trim_trailing_whitespace
• insert_final_newline = true is supported
• insert_final_newline = false is not enforced (as in trailing newlines actually being removed automagically), we just buffer-locally override any preferences that would auto-add them to files .editorconfig marks as trailing-newline-free
• max_line_length
• file_type_ext (Experimental)
• file_type_emacs (Experimental)
• root (only used by EditorConfig core)

Not yet covered properties marked with over-strike – pull requests implementing missing features warmly welcomed! Typically, you will want to tie these to native functionality, or the configuration of existing packages handling the feature.

As several packages have their own handling of, say, indentation, we might not yet cover some mode you use, but we try to add the ones that show up on our radar.

File Type

This plugin has experimental supports for file_type_ext and file_type_emacs, which specify "file types" for files. As for Emacs, it means major-mode can be set.

file_type_ext When it is set to md for a.txt, for example, major-mode will be decided as if the file name would be a.txt.md (and thus markdown-mode is likely to be used).

file_type_emacs When it is set to markdown for a.txt, markdown-mode will be enabled when opening a.txt.

These property are experimental and their meanings might change in the future updates. When both are specified, file_type_ext takes precedence.

Customize

editorconfig-emacs provides some customize variables.

Here are some of these variables: for the full list of available variables, type M-x customize-group [RET] editorconfig [RET].

editorconfig-trim-whitespaces-mode

Buffer local minor-mode to use to trim trailing whitespaces.

If set, editorconfig will enable/disable this mode in accord with trim_trailing_whitespace property in .editorconfig. Otherwise, use Emacs built-in delete-trailing-whitespace function.

One possible value is ws-butler-mode, with which only lines touched get trimmed. To use it, add following to your init.el:

(setq editorconfig-trim-whitespaces-mode
      'ws-butler-mode)

editorconfig-after-apply-functions

(Formerly editorconfig-custom-hooks)

A list of functions which will be called after loading common EditorConfig settings, when you can set some custom variables.

For example, web-mode has several variables for indentation offset size and EditorConfig sets them at once by indent_size. You can stop indenting only blocks of web-mode by adding following to your init.el:

(add-hook 'editorconfig-after-apply-functions
  (lambda (props) (setq web-mode-block-padding 0)))

editorconfig-hack-properties-functions

A list of functions to alter property values before applying them.

These functions will be run after loading ".editorconfig" files and before applying them to current buffer, so that you can alter some properties from ".editorconfig" before they take effect.

For example, Makefile files always use tab characters for indentation: you can overwrite "indent_style" property when current major-mode is makefile-mode:

(add-hook 'editorconfig-hack-properties-functions
          '(lambda (props)
             (when (derived-mode-p 'makefile-mode)
               (puthash 'indent_style "tab" props))))

Troubleshooting

Enabling editorconfig-mode should be enough for normal cases.

When EditorConfig properties are not effective for unknown reason, we recommend first trying M-x editorconfig-display-current-properties.

This command will open a new buffer and display the EditorConfig properties loaded for current buffer. You can check if EditorConfig properties were not read for buffers at all, or they were loaded but did not take effect for some other reasons.

Indentation for new major-modes

Because most Emacs major-modes have their own indentation settings, this plugin requires explicit support for each major-mode for indent_size property.

By default this plugin ships with settings for many major-modes, but, sorry to say, it cannot be perfect. Especially it is difficult to support brand-new major-modes. Please feel free to submit issue or pull-request for such major-mode!

Supported major-modes and their indentation configs are defined in the variable editorconfig-indentation-alist.

Not work at all for FOO-mode!

Most cases properties are loaded just after visiting files when editorconfig-mode is enabled. But it is known that there are major-modes that this mechanism does not work for and require explicit call of editorconfig-apply.

Typically it will occur when the major-mode is not defined using define-derived-mode (rpm-spec-mode is an example for this). Please feel free to submit issues if you find such modes!

Submitting Bugs and Feature Requests

Bugs, feature requests, and other issues should be submitted to the issue tracker: https://github.com/editorconfig/editorconfig-emacs/issues

Development

Make and CMake must be installed to run the tests locally:

$ make test

To start a new Emacs process with current *.el and without loading user init file, run:

$ make sandbox

License

EditorConfig Emacs Plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see https://www.gnu.org/licenses/.