neojski / evil-matchit

Vim matchit ported into Emacs

evil-matchit (v2.3.3)

Vim matchit.vim by Benji Fisher ported into Emacs.

Press “%” to jump between matched tags in Emacs. For example, in HTML “<div>” and “</div>” are a pair of tags.

Many modern languages are supported:

• HTML
• Python
• Java
• C++/C
• Javascript
• Typescript
• React JSX (rjsx-mode, react-mode)
• JSON
• OCaml
• Markdown
• Perl
• Latex
• CMake
• Org-mode (match tag of org-mode and tags of other languages embedded in org file)
• Ruby
• Elixir
• Bash
• Lua
• PHP
• Fortran
• SQL
• Laravel Blade Templating
• Vim script
• Verilog
• Emacs email (message-mode)

This package uses Evil as its vi layer!

Tested on Emacs 24.3, 24.4, 24.5, 25.1

Why use evil-matchit

• No learning curve. Press “%” to jump. That’s all!
• Stable. Usage of Evil API is minimized
• Perfect integration with Evil
• Support any modern languages (html/java/c/c++/python/latex/javascript …)
• Powerful. If you mix jsp, freemarker, html, jquery template or any weird syntax into one file, it still works!
• Extendable. Write a plugin for it takes only 5 minutes
• Long term support

Screen cast for python:

Install

It’s already uploaded to http://melpa.org/.

Set up

Insert below code into your ~/.emacs:

(require 'evil-matchit)
(global-evil-matchit-mode 1)

Alternatively, you can enable evil-matchit-mode along a major mode by adding turn-on-evil-matchit-mode to the mode hook.

Usage

Press “%” to jump inside between tag pair in normal mode or visual mode (you press “v” to switch to visual mode). Please note evil-matchit is smart enough to detect the tag automatically.

Tag pair could be open/closed html tag, or character pair like “{}” “[]” “()”, or the single/double quote(s) at the two ends of the string.

Inner/outer text object “%” is also created. It roughly equals the region when you press “%” from evil-matchit.

Press “va%” to select line(s) wrapped by tags including tags themselves. `M-x evilmi-select-items` does the same thing.

Press “da%” to delete line(s) wrapped by tags including tags themselves. `M-x evilmi-delete-items` does the same thing.

All commands support numeric argument like “3%”, “5va%” or “9da%”

Pressing “3%” jumps to a line 3 percentage down the file. It’s the default behavior in original evil-mode. You can `(setq evilmi-may-jump-by-percentage nil)` to turn off this feature. Then “3%” will jump 3 times.

Please note only “evil-visual-state” and “evil-normal-state” are officially supported.

If you need visually select lines, I strongly recommend using “evilmi-select-items” instead.

This is actually an advantage of Emacs, you can tweak the select region without go into visual state at all.

Advanced tips

Support new major modes

In order to apply three matching rules evilmi-template, evilmi-simple, and evilmi-html on mhtml-mode, please insert below code after your evil-nerd-commenter setup:

(evilmi-load-plugin-rules '(mhtml-mode) '(template simple html))

Use evilmi-select-items instead press “%” in evil-visual-state

evilmi-select-items is more robust and provides more functionality. It works even when evil-mode is not loaded.

So you’d better stick to evilmi-select-items if possible.

Add new tags into existing languages

Use ruby as an example.

If you want to add more tags into ruby, you can do two things:

• You need define the regular expression to extract keyword
• You need define the open/middle/closed tags

Open evil-matchit-ruby.el whole structure is like,

(defvar evilmi-ruby-extract-keyword-howtos '())
(defvar evilmi-ruby-match-tags '())
;; more code here ...
(provide 'evil-matchit-ruby)

So you setup in ~/.emacs is as below:

(eval-after-load 'evil-matchit-ruby
  '(progn
     (add-to-list 'evilmi-ruby-extract-keyword-howtos '("^[ \t]*\\([a-z]+\\)\\( .*\\| *\\)$" 1))
     (add-to-list 'evilmi-ruby-match-tags '(("unless" "if") ("elsif" "else") "end"))
     ))

Re-define keybinding

All you need to do is to define function evilmi-customize-keybinding before turning on evil-match-mode:

The shortcut % is defined in evilmi-shortcut. It’s the name of text object and shortcut of evilmi-jump-items. Some people prefer set it to “m”.

Change keybinding of evilmi-jump-items and name of the text object,

(setq evilmi-shortcut "m")
(global-evil-matchit-mode 1)

Change keybinding only,

(defun evilmi-customize-keybinding ()
  (evil-define-key 'normal evil-matchit-mode-map
    "%" 'evilmi-jump-items))
(global-evil-matchit-mode 1)

Jump between the two end of the “string”

Please note the definition of “string” could be customized by user.

For example, we could treat C comment as string wrapper by “/”.

Here is the setup to jump between the two ends of the C comment:

(setq evilmi-quote-chars (string-to-list "'\"/"))

Match case-sensitive tags?

It’s decided by the Emacs global variable “case-fold-search”. You need not care about it because the major mode will set this flag automatically.

Python

You can turn on evilmi-always-simple-jump to match brackets at first.

Thus, you disable our advanced algorithm which I highly recommend.

Some people may prefer simpler algorithm in python-mode.

Developer guide

Create plugin to support new language

Simple. You only need define two functions and tell evil-matchit in which major-mode they should be used.

A complete setup:

;; detect tag in current line and return the result in variable rlt
;; the rlt will be used by evilmi-mylang-jump as the first parameter.
;; if NO tag found, the rlt SHOULD be nil
;;
;; @return the data to be used by evilmi-mylang-jump which should be a list
;;         the first element of the list is the position of cursor before jump
;;         we use it to select/delete tag. The other elements of the list could
;;         be any data type
(defun evilmi-mylang-find-tag ()
  (list position-of-open-end "anything-you-like" "anything-you-like"))

;; @parama rlt result from evilmi-mylang-find-tag
;; @param NUM numeric argument when user press "%" to match tag
;; @return the matching tag position in theory, useful only for
;;         selecting or deleting text between matching tags and tags
(defun evilmi-mylang-jump (rlt NUM)
  (message "rlt=%s" rlt)
  ;; if we need select region between tags (including tags itself)
  ;; we get the beginning of region by reading the first element of
  ;; rlt
  (push-mark (nth 0 rlt) t t)
  ;; say 999 is the where we jump to
  (goto-char 999)
  ;; If you need know where is the end of the region for region operation,
  ;; you need return the end of region at the end of function
  ;; region operation means selection/deletion of region.
  888)

;; Notify evil-matchit how to use above functions
(evilmi-load-plugin-rules '(mylang-mode) '(mylan))

Place above code into your ~/.emacs, after the line “(global-evil-matchit-mode 1)”

Use SDK

For example, it only takes 3 steps to create a new rule script to match tags in script like Ruby/Lua/Bash/VimScript,

Step 1, create evil-matchit-script.el,

(require 'evil-matchit-sdk)

;; ruby/bash/lua/vimrc
(defvar evilmi-script-match-tags
  '((("unless" "if") ("elif" "elsif" "elseif" "else") ( "end" "fi" "endif"))
    ("begin" ("rescue" "ensure") "end")
    ("case" ("when" "else") ("esac" "end"))
    (("fun!" "function!" "class" "def" "while" "function" "do") () ("end" "endfun" "endfunction"))
    ("repeat" ()  "until"))
  "The table we look up match tags. This is a three column table.
The first column contains the open tag(s).
The second column contains the middle tag(s).
The third column contains the closed tags(s).
The forth *optional* column defines the relationship between open and close tags. It could be MONOGAMY
")

;;;###autoload
(defun evilmi-script-get-tag ()
  (evilmi-sdk-get-tag evilmi-script-match-tags
                      evilmi-sdk-extract-keyword-howtos))

;;;###autoload
(defun evilmi-script-jump (rlt num)
  (evilmi-sdk-jump rlt
                   num
                   evilmi-script-match-tags
                   evilmi-sdk-extract-keyword-howtos))

(provide 'evil-matchit-script)

Step 2, make sure the directory of evil-matchit-script.el is added into load-path.

Step 3, add below code to ~/.emacs.,

(evilmi-load-plugin-rules '(ruby-mode lua-mode) '(script))

APIs

• evilmi-load-plugin-rules
• evilmi-current-font-among-fonts-p
• evilmi-in-comment-p
• evilmi-in-string-or-doc-p

Contact me

Report bugs at https://github.com/redguardtoo/evil-matchit.