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https://github.com/magnars/expand-region.el

Emacs extension to increase selected region by semantic units.
https://github.com/magnars/expand-region.el

Last synced: 29 days ago
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Emacs extension to increase selected region by semantic units.

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# expand-region.el



Expand region increases the selected region by semantic units. Just keep

pressing the key until it selects what you want.



An example:



    (setq alphabet-start "abc def")



With the cursor at the `c`, it starts by marking the entire word `abc`, then

expand to the contents of the quotes `abc def`, then to the entire quote

`"abc def"`, then to the contents of the sexp `setq alphabet-start "abc def"`

and finally to the entire sexp.



You can set it up like this:



    (require 'expand-region)

    (global-set-key (kbd "C-=") 'er/expand-region)



If you expand too far, you can contract the region by pressing `-` (minus key),

or by prefixing the shortcut you defined with a negative argument: `C-- C-=`.



## Maintenance warning



I use this package every day, and have been doing so for years. It just works.

At least, it works for all my use cases. And if it breaks somehow, I fix it.



However, it has become painfully clear to me that I don't have time to fix

problems I don't have. It's been years since I could keep pace with the issues

and pull requests. Whenever I try, I keep getting feedback that my fix isn't

good enough by some standard I don't particularly care about.



So, I have closed the issue tracker and the pull requests. I hope you can

happily use this package, just like I do. If it doesn't work for you, then I'm

sorry. Thankfully Emacs is infinitely malleable, you can probably fix it

yourself.



TLDR: *I am still maintaining this package*, but I am no longer crowdsourcing a list of issues.



## Video



You can [watch an intro to expand-region at Emacs Rocks](http://emacsrocks.com/e09.html).



## Installation



I highly recommend installing expand-region through elpa.



It's available on [MELPA](https://melpa.org/):



    M-x package-install expand-region



Via [use-package](https://github.com/jwiegley/use-package):



    (use-package expand-region

      :bind ("C-=" . er/expand-region))



## Language support



Expand region works fairly well with most languages, due to the general

nature of the basic expansions:



    er/mark-word

    er/mark-symbol

    er/mark-symbol-with-prefix

    er/mark-next-accessor

    er/mark-method-call

    er/mark-inside-quotes

    er/mark-outside-quotes

    er/mark-inside-pairs

    er/mark-outside-pairs

    er/mark-comment

    er/mark-url

    er/mark-email

    er/mark-defun



However, most languages also will benefit from some specially crafted

expansions. For instance, expand-region comes with these extra expansions for

html-mode:



    er/mark-html-attribute

    er/mark-inner-tag

    er/mark-outer-tag



You can add your own expansions to the languages of your choice simply by

creating a function that looks around point to see if it's inside or looking

at the construct you want to mark, and if so - mark it.



There's plenty of examples to look at in these files.



After you make your function, add it to a buffer-local version of

the `er/try-expand-list`.



**Example:**



Let's say you want expand-region to also mark paragraphs and pages in

text-mode. Incidentally Emacs already comes with `mark-paragraph` and

`mark-page`. To add it to the try-list, do this:



    (defun er/add-text-mode-expansions ()

      (make-variable-buffer-local 'er/try-expand-list)

      (setq er/try-expand-list (append

                                er/try-expand-list

                                '(mark-paragraph

                                  mark-page))))



    (add-hook 'text-mode-hook 'er/add-text-mode-expansions)



Add that to its own file, and add it to the `expand-region.el`-file,

where it says "Mode-specific expansions"



**Warning:** Badly written expansions might slow down expand-region

dramatically. Remember to exit quickly before you start traversing

the entire document looking for constructs to mark.



## Contribute



If you make some nice expansions for your favorite mode, it would be

great if you opened a pull-request. The repo is at:



    https://github.com/magnars/expand-region.el



All changes must be accompanied by feature tests.

They are written in [Ecukes](http://ecukes.info), a Cucumber for Emacs.



To fetch the test dependencies, install

[cask](https://github.com/rejeep/cask.el) if you haven't already,

then:



    $ cd /path/to/expand-region

    $ cask



Run the tests with:



    $ ./run-tests.sh



If feature tests are missing for the mode you are changing, please make

sure to add a set of basic tests around the functionality you're changing.



## Contributors



* [Josh Johnston](https://github.com/joshwnj) contributed `er/contract-region`

* [Le Wang](https://github.com/lewang) contributed consistent handling of the mark ring, expanding into pairs/quotes just left of the cursor, and general code clean-up.

* [Raimon Grau](https://github.com/kidd) added support for when transient-mark-mode is off.

* [Roland Walker](https://github.com/rolandwalker) added option to copy the contents of the most recent action to a register, and some fixes.

* [Damien Cassou](https://github.com/DamienCassou) added option to continue expanding/contracting with fast keys after initial expand.

* [Sylvain Rousseau](https://github.com/thisirs) fixed loads of little annoyances.

* [Ryan Mulligan](https://github.com/ryantm) cleaned up a lot of byte compilation warnings.

* [Lefteris Karapetsas](https://github.com/LefterisJP) added subword-mode expansions.



### Language specific contributions



* [Matt Briggs](https://github.com/mbriggs), [Jorge Dias](https://github.com/diasjorge) and [Le Wang](https://github.com/lewang) contributed Ruby expansions.

* [Ivan Andrus](https://github.com/gvol), [fgeller](https://github.com/fgeller), [edmccard](https://github.com/edmccard) and [Rotem Yaari](https://github.com/vmalloc) contributed Python expansions.

* [François Févotte](https://github.com/ffevotte) contributed C and C++ expansions.

* [Ivan Andrus](https://github.com/gvol) contributed text-mode, LaTeX-mode and nxml-mode expansions.

* [Gleb Peregud](https://github.com/gleber) contributed Erlang expansions.

* [Mark Hepburn](https://github.com/markhepburn) contributed Octave expansions.

* [Rotem Yaari](https://github.com/vmalloc) also contributed an adapter for the region expansion in web-mode.

* [Kang-min Liu](https://github.com/gugod) contributed Perl expansions.

* [Alexis Gallagher](https://github.com/algal) contributs Standard ML expansions.

* [Matt Price](https://github.com/titaniumbones) improved on org-mode expansions.

* [Maksim Grinman](https://github.com/maksle) added inner-quotes expansion for nxml-mode.

* [Andrea Orru](https://github.com/AndreaOrru) added `expand-region-smart-cursor`.



Thanks!



## Changelog



### From 0.11 to 0.12 (WIP)



* Option `expand-region-subword-enabled` to enable subword expansions

* Improve web-mode expansions (Renato F)

* Fixes for cc-mode expansions (Wilfred Hughes)

* Fixes for org-mode expansions (Wilfred Hughes)

* Fix unnecessary unfolding in org-mode

* Fix bug with transient-mark-mode (Russell Black)

* Fix problems with auto-loading (Philippe Vaucher, Wilfred Hughes)



### From 0.10 to 0.11



* Option `expand-region-smart-cursor` to keep cursor at beginning of region if it is there (Andrea Orru)

* Add subword-mode expansions (Lefteris Karapetsas)

* Improve enh-ruby-mode expansions (Ryan Davis)

* Improve nxml-mode expansions (Maksim Grinman)

* Improve org-mode expansions (Matt Price)

* Improve js-mode expansions

* Better performance

* Lots of bugfixes



### From 0.9 to 0.10



* Smarter expansion of ruby heredoc contents (Steve Purcell)

* Add enh-ruby-mode expansions (Bradley Wright)

* Add basic expansion er/mark-defun

* Big cleanup of byte compilation warnings (Ryan Mulligan)

* Better performance

* Lots of bugfixes



### From 0.8 to 0.9



* Improve org-, clojure-, python-, latex-, cc- and ruby-modes

* Add basic expansions: email and url

* Add sml-mode expansions (Alexis Gallagher)

* Add cperl-mode expansions (Kang-min Liu)

* Add octave-mode expansions (Mark Hepburn)

* Add web-mode expansions (Rotem Yaari)

* Use Carton for dev-dependencies

* Fix bad behavior in minibuffer (Sylvain Rousseau)

* More robust comment expansions

* Improve loading of expansions for all major modes



### From 0.7 to 0.8



* Improve js-, ruby-, python- and latex-modes

* Support built-in javascript-mode

* Handle narrowed buffers correctly

* Include mode-specific expansions when autoloading

* Provide option to copy the contents of the most recent action to a register

* Add cc-mode specific expansions

* Add customization to turn off skipping whitespace when expanding

* Continue expanding/contracting with one key press (optional)



## License



Copyright (C) 2011-2019 Magnar Sveen



Author: Magnar Sveen 

Keywords: marking region



This program 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 .