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# Contributing to Vimium
You'd like to fix a bug or implement a feature? Great! Check out the bugs on our issues tracker, or implement
one of the suggestions there that have been tagged "help wanted". If you have a suggestion of your own, start
a discussion on the issues tracker or on the
[mailing list](http://groups.google.com/group/vimium-dev?hl=en). If it mirrors a similar feature in another
browser or in Vim itself, let us know. Once you've picked something to work on, add a comment to the
respective issue so others don't duplicate your effort.
## Reporting Issues
Please include the following when reporting an issue:
1. Chrome and OS Version: `chrome://version`
1. Vimium Version: `chrome://extensions`
## Installing From Source
Vimium is written in Coffeescript, which compiles to Javascript. To
install Vimium from source:
1. Install [Coffeescript](http://coffeescript.org/#installation).
1. Run `cake build` from within your vimium directory. Any coffeescript files you change will now be automatically compiled to Javascript.
1. Navigate to `chrome://extensions`
1. Toggle into Developer Mode
1. Click on "Load Unpacked Extension..."
1. Select the Vimium directory.
## Development tips
1. Run `cake autobuild` to watch for changes to coffee files, and have the .js files automatically
regenerated
## Running the tests
Our tests use [shoulda.js](https://github.com/philc/shoulda.js) and [PhantomJS](http://phantomjs.org/). To run the tests:
1. `git submodule update --init --recursive` -- this pulls in shoulda.js.
1. Install [PhantomJS](http://phantomjs.org/download.html).
1. `npm install path` to install the [Node.js Path module](http://nodejs.org/api/path.html), used by the test runner.
1. `cake build` to compile `*.coffee` to `*.js`
1. `cake test` to run the tests.
## Code Coverage
You can find out which portions of code need them by looking at our coverage reports. To generate these
reports:
1. Download [JSCoverage](http://siliconforks.com/jscoverage/download.html) or `brew install jscoverage`
1. `npm install temp`
1. `cake coverage` will generate a coverage report in the form of a JSON file (`jscoverage.json`), which can
then be viewed using [jscoverage-report](https://github.com/int3/jscoverage-report). See
jscoverage-report's [README](https://github.com/int3/jscoverage-report#jscoverage-report) for more details.
## Coding Style
* We follow the recommendations from
[this style guide](https://github.com/polarmobile/coffeescript-style-guide).
* We follow two major differences from this style guide:
* Wrap lines at 110 characters instead of 80.
* Use double-quoted strings by default.
* When writing comments, uppercase the first letter of your sentence, and put a period at the end.
* If you have a short conditional, feel free to put it on one line:
# No
if i < 10
return
# Yes
return if i < 10
## Pull Requests
When you're done with your changes, send us a pull request on Github. Feel free to include a change to the
CREDITS file with your patch.
## What makes for a good feature request/contribution to Vimium?
Good features:
* Useful for lots of Vimium users
* Require no/little documentation
* Useful without configuration
* Intuitive or leverage strong convention from Vim
* Work robustly on most/all sites
Less-good features:
* Are very niche, and so aren't useful for many Vimium users
* Require explanation
* Require configuration before it becomes useful
* Unintuitive, or they don't leverage a strong convention from Vim
* Might be flaky and don't work in many cases
We use these guidelines, in addition to the code complexity, when deciding whether to merge in a pull request.
If you're worried that a feature you plan to build won't be a good fit for core Vimium, just open a github
issue for discussion or send an email to the Vimium mailing list.
## How to release Vimium to the Chrome Store
This process is currently only done by Phil or Ilya.
1. Increment the version number in manifest.json
2. Update the Changelog in README.md
You can see a summary of commits since the last version: `git log --oneline v1.45..`
3. Push your commits
4. Create a git tag for this newly released version
git tag -a v1.45 -m "v1.45 release"
5. Run `cake package`
6. Take the distributable found in `dist` and upload it
[here](https://chrome.google.com/webstore/developer/dashboard)
7. Update the description in the Chrome store to include the latest version's release notes
8. Celebrate
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