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This pull request splits the developer documentation into `CONTRIBUTING.md` and `DEVELOPING.md`. `CONTRIBUTING.md` now contains an additional paragraph, instructing contributors to create an issue before submitting a pull request. The introduction of this additional step was discussed at this year's FOSS4G conference. This new step would also affect contributions from core developers.
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# Developing | ||
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## Setting up development environment | ||
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You will obviously start by | ||
[forking](https://github.com/openlayers/ol3/fork) the ol3 repository. | ||
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### Travis CI | ||
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The Travis CI hook is enabled on the Github repository. This means every pull request | ||
is run through a full test suite to ensure it compiles and passes the tests. Failing | ||
pull requests will not be merged. | ||
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Although not mandatory, it is also recommended to set up Travis CI for your ol3 fork. | ||
For that go to your ol3 fork's Service Hooks page and set up the Travis hook. | ||
Then every time you push to your fork, the test suite will be run. This means | ||
errors can be caught before creating a pull request. For those making | ||
small or occasional contributions, this may be enough to check that your contributions | ||
are ok; in this case, you do not need to install the build tools on your local environment | ||
as described below. | ||
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### Development dependencies | ||
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The minimum requirements are: | ||
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* GNU Make | ||
* Git | ||
* [Node.js](http://nodejs.org/) (0.10.x or higher) | ||
* Python 2.6 or 2.7 with a couple of extra modules (see below) | ||
* Java 7 (JRE and JDK) | ||
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The executables `git`, `node`, `python` and `java` should be in your `PATH`. | ||
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You can check your configuration by running: | ||
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$ make check-deps | ||
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To install the Node.js dependencies run | ||
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$ npm install | ||
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To install the extra Python modules, run: | ||
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$ sudo pip install -r requirements.txt | ||
or | ||
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$ cat requirements.txt | sudo xargs easy_install | ||
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depending on your OS and Python installation. | ||
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(You can also install the Python modules in a Python virtual environment if you want to.) | ||
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## Working with the build tool | ||
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As an ol3 developer you will use `make` to run build targets defined in the | ||
`Makefile` located at the root of the repository. The `Makefile` includes | ||
targets for running the linter, the compiler, the tests, etc. | ||
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The usage of `make` is as follows: | ||
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$ make <target> | ||
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where `<target>` is the name of the build target you want to execute. For | ||
example: | ||
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$ make test | ||
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The main build targets are `serve`, `lint`, `build`, `test`, and `check`. The | ||
latter is a meta-target that basically runs `lint`, `build`, and `test`. | ||
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The `serve` target starts a node-based web server, which we will refer to as the *dev server*. You'll need to start that server for running the examples and the tests in a browser. More information on that further down. | ||
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Other targets include `apidoc` and `ci`. The latter is the target used on Travis CI. See ol3's [Travis configuration file](https://github.com/openlayers/ol3/blob/master/.travis.yml). | ||
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## Running the `check` target | ||
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The `check` target is to be run before pushing code to GitHub and opening pull | ||
requests. Branches that don't pass `check` won't pass the integration tests, | ||
and have therefore no chance of being merged into `master`. | ||
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To run the `check` target: | ||
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$ make check | ||
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If you want to run the full suite of integration tests, see "Running the integration | ||
tests" below. | ||
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## Running examples | ||
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To run the examples you first need to start the dev server: | ||
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$ make serve | ||
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Then, just point your browser <http://localhost:3000/build/examples> in your browser. For example <http://localhost:3000/build/examples/side-by-side.html>. | ||
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Run examples against the `ol.js` standalone build: | ||
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The examples can also be run against the `ol.js` standalone build, just like | ||
the examples [hosted](http://openlayers.org/en/master/examples/) on GitHub. | ||
Start by executing the `host-examples` build target: | ||
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$ make host-examples | ||
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After running `host-examples` you can now open the examples index page in the browser: <http://localhost:3000/build/hosted/master/examples/>. (This assumes that you still have the dev server running.) | ||
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Append `?mode=raw` to make the example work in full debug mode. In raw mode the OpenLayers and Closure Library scripts are loaded individually by the Closure Library's `base.js` script (which the example page loads and executes before any other script). | ||
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## Running tests | ||
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To run the tests in a browser start the dev server (`make serve`) and open <http://localhost:3000/test/index.html> in the browser. | ||
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To run the tests on the console (headless testing with PhantomJS) use the `test` target: | ||
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$ make test | ||
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See also the test-specific [README](../master/test/README.md). | ||
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## Running the integration tests | ||
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When you submit a pull request the [Travis continuous integration | ||
server](https://travis-ci.org/) will run a full suite of tests, including | ||
building all versions of the library and checking that all of the examples | ||
work. You will receive an email with the results, and the status will be | ||
displayed in the pull request. | ||
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To run the full suite of integration tests use the `ci` target: | ||
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$ make ci | ||
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Running the full suite of integration tests currently takes 5-10 minutes. | ||
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This makes sure that your commit won't break the build. It also runs JSDoc3 to | ||
make sure that there are no invalid API doc directives. | ||
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## Adding examples | ||
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Adding functionality often implies adding one or several examples. This | ||
section provides explanations related to adding examples. | ||
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The examples are located in the `examples` directory. Adding a new example | ||
implies creating two or three files in this directory, an `.html` file, a `.js` | ||
file, and, optionally, a `.css` file. | ||
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You can use `simple.js` and `simple.html` as templates for new examples. | ||
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### Use of the `goog` namespace in examples | ||
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Short story: the ol3 examples should not use the `goog` namespace, except | ||
for `goog.require`. | ||
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Longer story: we want that the ol3 examples work in multiple modes, with the | ||
standalone lib (which has implications of the symbols and properties we | ||
export), and compiled together with the ol3 library. | ||
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Compiling the examples together with the library makes it mandatory to declare dependencies with `goog.require` statements. |