Contributing

If you're not familiar with pdf.js first see the readme getting started section.

Contributing Code

An overview how to contribute code to the pdf.js project. The basic workflow:

1. fork
2. feature branch
3. make changes
4. run lint and testing
5. push changes to your fork/branch
6. create pull request
7. code review & automated testing
8. merge into the master

The Bare Necessities

• git client
• git hub account
• python - http://www.python.org/download/
• node - http://nodejs.org/
• gjslint - Use version 2.3.5 https://developers.google.com/closure/utilities/docs/linter_howto
• (for Windows, see Setting up pdf.js Development Environment for Windows)

Before you make any changes to the code you'll probably want jump down to the section on "Generating Reference Images" to create the reference snapshot images so you can run the test framework and check for regressions.

If you're familiar with github and doing feature branches you can skip down to "4) Run Lint and Testing"...

1) Fork

To fork the repository you'll need to sign up for a github account. Once you have an account just click the little fork button up top. Now that you have your fork you'll need to clone it (replace <YOUR USERNAME>):

git clone git://github.com/<YOUR USERNAME>/pdf.js.git

It's useful to have the upstream repository registered as well

git remote add upstream git://github.com/mozilla/pdf.js.git

and periodically fetch it using git fetch upstream.

2) Branch

We try to do everything in feature branches. For example, to create and switch to a type 3 font branch use:

git checkout -b type3fontsupport upstream/master

3) Changes

Now that you have new branch created you can edit/add/delete files. Follow the standard git workflow to stage and locally commit your changes -- there are lots of guides that explain git.

If the branch contains lot of small commits, you might be asked to squash the commits. You can use git rebase option or follow the Squashing Commits instructions.

4) Run Lint and Testing

Run Lint

Make sure your code follows our style guides, run from the pdf.js folder:

node make lint

Run Testing

To ensure your changes didn't introduce any regressions you'll need to run the testing framework. There are four basic types of tests:

• load - just checks if the pdf file can be loaded without crashing
• eq - a reference test which takes correctly rendered snapshots and compares them to the snapshots created by the current code
• fbf - a forward back forward test
• unit tests - jasmine unit tests that are run separately from the above tests

Generating Reference Images

The reference tests require you to generate the original snapshots for comparison. The snapshots should be generated before you make any changes. If you have already made some changes git stash your work. Then make sure you have setup a browser_manifest file. There are templates located in test/resources/browser_manifests/. Copy one of the templates (replace <your os> with mac, linux, or win).

cp test/resources/browser_manifests/browser_manifest.json.<your os> test/resources/browser_manifests/browser_manifest.json

Then edit the manifest in your favorite editor and make sure it points to the browser(s) you want to use for generating the reference images.

Now we can generate the reference images:

cd test/
python test.py -m --browserManifestFile=resources/browser_manifests/browser_manifest.json

You can then run the test suite from the pdf.js root folder:

node make test

Running Unit Tests Separately

Unit tests are run when node make test is run but they can also be run separately two different ways:

1. In browser - A web server has to be setup to host the pdf.js files. Tests will be executed by opening the <url-to-pdf.js>/test/unit/unit_test.html page. If the web server is created by using node make server command, the URL will be http://localhost:8888/test/unit/unit_test.html.
2. Command Line - node make unittest which will run all the test using the regression test framework.

5) Push Changes

After lint and all tests pass, push changes to your fork/branch on github:

git push origin type3fontsupport

6) Pull Request

Create a pull request on github for your feature branch. The code will then be reviewed and tested further by our pdfbot.

7) Code Review & Further Testing

In addition to the github pull request workflow, it's highly recommended that you setup some form of communication with pdf.js team via #pdfjs IRC channel at irc.mozilla.org or e-mail. That will help to find a reviewer for your patch and speed up the review process.

A collaborator will kick off further testing and do a code review.

8) Merging to Master

If all goes well a collaborator will merge all your changes into the main repo.