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  <div class="section" id="contribute-code">
<span id="contribute-code"></span><h1>Contribute Code<a class="headerlink" href="#contribute-code" title="Permalink to this headline">¶</a></h1>
<p>We sincerely appreciate your contributions. You can use fork and pull request
workflow to merge your code.</p>
<div class="section" id="code-requirements">
<span id="code-requirements"></span><h2>Code Requirements<a class="headerlink" href="#code-requirements" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li>Your code must be fully documented by
<a class="reference external" href="http://www.stack.nl/~dimitri/doxygen/">doxygen</a> style.</li>
<li>Make sure the compiler option WITH_STYLE_CHECK is on and the compiler
passes the code style check.</li>
<li>All code must have unit test.</li>
<li>Pass all unit tests.</li>
</ul>
<p>The following tutorial guides you into submitting your contibution.</p>
</div>
<div class="section" id="creating-a-fork">
<span id="creating-a-fork"></span><h2><a class="reference external" href="https://help.github.com/articles/fork-a-repo/">Creating a Fork</a><a class="headerlink" href="#creating-a-fork" title="Permalink to this headline">¶</a></h2>
<p>Just head over to the GitHub page and click the &#8220;Fork&#8221; button.
It&#8217;s just that simple.</p>
</div>
<div class="section" id="clone">
<span id="clone"></span><h2>Clone<a class="headerlink" href="#clone" title="Permalink to this headline">¶</a></h2>
<p>Paddle is currently using <a class="reference external" href="http://nvie.com/posts/a-successful-git-branching-model/">git-flow branching model</a>.
The <strong>develop</strong> is the main branch, and other user&#8217;s branches are feature branches.</p>
<p>Once you&#8217;ve created a fork, you can use your favorite git client to clone your
repo or just head straight to the command line:</p>
<div class="highlight-shell"><div class="highlight"><pre><span></span><span class="c1"># Clone your fork to your local machine</span>
git clone --branch develop https://github.com/USERNAME/Paddle.git
</pre></div>
</div>
<p>If your repository doesn&#8217;t contain <strong>develop</strong> branch, just create it by your own.</p>
<div class="highlight-shell"><div class="highlight"><pre><span></span>git clone https://github.com/USERNAME/Paddle.git Paddle
<span class="nb">cd</span> Paddle
git checkout -b develop  <span class="c1"># create develop branch.</span>
git remote add upstream https://github.com/PaddlePaddle/Paddle.git  <span class="c1"># add upstream to baidu/Paddle</span>
git pull upstream develop  <span class="c1"># update to upstream</span>
</pre></div>
</div>
<p>Then you can start to develop by making a local developement branch</p>
<div class="highlight-shell"><div class="highlight"><pre><span></span>git checkout -b MY_COOL_STUFF_BRANCH
</pre></div>
</div>
</div>
<div class="section" id="using-pre-commit-hook">
<span id="using-pre-commit-hook"></span><h2>Using <code class="docutils literal"><span class="pre">pre-commit</span></code> hook<a class="headerlink" href="#using-pre-commit-hook" title="Permalink to this headline">¶</a></h2>
<p>Paddle developers use <a class="reference external" href="http://pre-commit.com/">pre-commit</a> tool to manage git
pre-commit hooks. It can help us format source codes (cpp, python), check some
basic thing before commit (only one EOL for each file, do not add a huge file
in git). <code class="docutils literal"><span class="pre">pre-commit</span></code> tests is a part of unit tests in Travis-CI now, every
PR doesn&#8217;t fit hook can not be merged into Paddle.</p>
<p>To use <a class="reference external" href="http://pre-commit.com/">pre-commit</a>, you should install it by
<code class="docutils literal"><span class="pre">pip</span> <span class="pre">install</span> <span class="pre">pre-commit</span></code>, and currently, Paddle uses <code class="docutils literal"><span class="pre">clang-format</span></code> to format
c/cpp sources. Please make sure clang-format 3.8+ installed.</p>
<p>Then just run <code class="docutils literal"><span class="pre">pre-commit</span> <span class="pre">install</span></code> in your Paddle clone directory. When you
commit your code, the pre-commit hook will check the local code if there is
anything not suitable to commit, and so on.</p>
</div>
<div class="section" id="commit">
<span id="commit"></span><h2>Commit<a class="headerlink" href="#commit" title="Permalink to this headline">¶</a></h2>
<p>Commit your changes by following command lines:</p>
<div class="highlight-shell"><div class="highlight"><pre><span></span><span class="c1"># show the working tree status</span>
git status
<span class="c1"># add modified files</span>
git add xx
env <span class="nv">EDITOR</span><span class="o">=</span>vim git commit  <span class="c1"># You can write your comments by vim/nano/emacs.</span>
</pre></div>
</div>
<p>The first line of commit infomation is the title. The second and later lines
are the details if any.</p>
</div>
<div class="section" id="keeping-fork-up-to-date">
<span id="keeping-fork-up-to-date"></span><h2>Keeping Fork Up to Date<a class="headerlink" href="#keeping-fork-up-to-date" title="Permalink to this headline">¶</a></h2>
<p>Before pull your request, you should sync your code from the latest PaddlePaddle.
To do this, you&#8217;ll need to add a remote at first:</p>
<div class="highlight-shell"><div class="highlight"><pre><span></span><span class="c1"># see the current configured remote repository</span>
git remote -v
<span class="c1"># add upstream repository</span>
git remote add upstream https://github.com/PaddlePaddle/Paddle.git
<span class="c1"># verify the new upstream</span>
git remote -v
</pre></div>
</div>
<p>Update your fork with the latest upstream changes:</p>
<div class="highlight-shell"><div class="highlight"><pre><span></span>git pull --rebase upstream develop
</pre></div>
</div>
<p>If there are no unique commits locally, git will simply perform a fast-forward.
However, if you have been making changes (in the vast majority of cases you
probably shouldn&#8217;t be), you may have to deal with conflicts.</p>
<p>Now, your local master branch is up-to-date with everything modified upstream.</p>
</div>
<div class="section" id="push-to-github">
<span id="push-to-github"></span><h2>Push to GitHub<a class="headerlink" href="#push-to-github" title="Permalink to this headline">¶</a></h2>
<div class="highlight-shell"><div class="highlight"><pre><span></span><span class="c1"># push to your repository in Github</span>
git push -u origin MY_COOL_STUFF_BRANCH  <span class="c1"># create remote branch MY_COOL_STUFF_BRANCH to origin.</span>
</pre></div>
</div>
</div>
<div class="section" id="pull-request">
<span id="pull-request"></span><h2>Pull Request<a class="headerlink" href="#pull-request" title="Permalink to this headline">¶</a></h2>
<p>Go to the page for your fork on GitHub, select your development branch,
and click the <strong>pull request button</strong>.</p>
</div>
<div class="section" id="update-your-pull-request-with-the-lastest-version">
<span id="update-your-pull-request-with-the-lastest-version"></span><h2>Update your pull request with the lastest version<a class="headerlink" href="#update-your-pull-request-with-the-lastest-version" title="Permalink to this headline">¶</a></h2>
<p>During the code review, your pull request may become stale because new commits in
baidu/Paddle. GitHub allows autmotic update if there is no conflict. You can do this
by clicking the &#8220;Update Branch&#8221; button in your pull request page. However, in the case
of conflict, you need to do the update manually. You need to do the following on
your local repository:</p>
<div class="highlight-shell"><div class="highlight"><pre><span></span>git checkout MY_COOL_STUFF_BRANCH
git pull upstream develop
<span class="c1"># You may need to resolve the conflict according to the git prompt.</span>
<span class="c1"># Make and test your code.</span>
git push origin MY_COOL_STUFF_BRANCH
</pre></div>
</div>
<p>Now your Pull Request is updated with the latest version.</p>
</div>
<div class="section" id="revise-your-pull-request">
<span id="revise-your-pull-request"></span><h2>Revise your pull request<a class="headerlink" href="#revise-your-pull-request" title="Permalink to this headline">¶</a></h2>
<p>When you revise your pull request according to reviewer&#8217;s comments, please use &#8216;git commit&#8217; instead of &#8216;git commit &#8211;amend&#8217; to commit your changes so that the reviewers can see the difference between the new pull requrest and the old pull request.</p>
<p>The possible commands are</p>
<div class="highlight-shell"><div class="highlight"><pre><span></span>git checkout MY_COOL_STUFF_BRANCH
git pull upstream develop   <span class="c1"># update local to newest code base.</span>
<span class="c1"># May be some conflicts will occured.</span>
<span class="c1"># And develop your cool stuff</span>
env <span class="nv">EDITOR</span><span class="o">=</span>vim git commit  <span class="c1"># add your revise log</span>
git push origin MY_COOL_STUFF_BRANCH
</pre></div>
</div>
</div>
</div>


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