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  <div class="section" id="developers">
<h1>Developers<a class="headerlink" href="#developers" title="Permalink to this headline"></a></h1>
<p>If you are a developer and use pyexiv2 in your project, you will find here
useful information.</p>
<div class="section" id="getting-the-code">
<h2>Getting the code<a class="headerlink" href="#getting-the-code" title="Permalink to this headline"></a></h2>
<p>pyexiv2&#8217;s source code is versioned with
<a class="reference external" href="http://bazaar.canonical.com/">bazaar</a>, and all the branches, including the
main development focus (sometimes referred to as <em>trunk</em>), are hosted on
<a class="reference external" href="https://code.launchpad.net/pyexiv2">Launchpad</a>.</p>
<p>To get a working copy of the latest revision of the development branch, just
issue the following command in a terminal:</p>
<div class="highlight-python"><pre>bzr branch lp:pyexiv2</pre>
</div>
<p>If you need to get a specific revision identified by a tag (all releases of
pyexiv2 are tagged), use the following command:</p>
<div class="highlight-python"><pre>bzr branch -r tag:tag_name lp:pyexiv2</pre>
</div>
<p>A list of all the available tags can be obtained using the <tt class="docutils literal"><span class="pre">bzr</span> <span class="pre">tags</span></tt>
command:</p>
<div class="highlight-python"><pre>osomon@granuja:~/dev/pyexiv2$ bzr tags
release-0.1          60
release-0.1.1        73
release-0.1.2        99
release-0.1.3        99.1.6
release-0.2.0        296
release-0.2.1        306
release-0.2.2        318
release-0.3.0        349</pre>
</div>
</div>
<div class="section" id="dependencies">
<h2>Dependencies<a class="headerlink" href="#dependencies" title="Permalink to this headline"></a></h2>
<p>You will need the following dependencies installed on your system to build and
use pyexiv2:</p>
<ul class="simple">
<li><a class="reference external" href="http://python.org/download/">Python</a> ≥ 2.6</li>
<li><a class="reference external" href="http://www.boost.org/libs/python/doc/">boost.python</a> ≥ 1.35</li>
<li><a class="reference external" href="http://exiv2.org/">libexiv2</a> ≥ 0.19</li>
<li><a class="reference external" href="http://scons.org/">SCons</a></li>
</ul>
<p>For Python, boost.python and libexiv2, the development files are needed
(-dev packages).
A typical list of packages to install on a Debian/Ubuntu system is:</p>
<div class="highlight-python"><pre>python-all-dev libboost-python-dev libexiv2-dev scons</pre>
</div>
<p>Some unit tests have a dependency on
<a class="reference external" href="http://pytz.sourceforge.net/">python-tz</a>.
This dependency is optional: the corresponding tests will be skipped if it is
not present on the system.</p>
<p>Additionally, if you want to cross-compile pyexiv2 for Windows and generate a
Windows installer, you will need the following dependencies:</p>
<ul class="simple">
<li><a class="reference external" href="http://www.mingw.org/">MinGW</a></li>
<li><a class="reference external" href="http://7-zip.org/">7-Zip</a></li>
<li><a class="reference external" href="http://nsis.sourceforge.net/">NSIS</a></li>
</ul>
<p>A typical list of packages to install on a Debian/Ubuntu system is:</p>
<div class="highlight-python"><pre>mingw32 p7zip-full nsis</pre>
</div>
</div>
<div class="section" id="building-and-installing">
<h2>Building and installing<a class="headerlink" href="#building-and-installing" title="Permalink to this headline"></a></h2>
<div class="section" id="linux">
<h3>Linux<a class="headerlink" href="#linux" title="Permalink to this headline"></a></h3>
<p>Building pyexiv2 is as simple as invoking <tt class="docutils literal"><span class="pre">scons</span></tt> in the top-level directory:</p>
<div class="highlight-python"><pre>osomon@granuja:~/dev/pyexiv2$ scons
scons: Reading SConscript files ...
scons: done reading SConscript files.
scons: Building targets ...
g++ -o build/exiv2wrapper.os -c -fPIC -I/usr/include/python2.7 src/exiv2wrapper.cpp
g++ -o build/exiv2wrapper_python.os -c -fPIC -I/usr/include/python2.7 src/exiv2wrapper_python.cpp
g++ -o build/libexiv2python.so -shared build/exiv2wrapper.os build/exiv2wrapper_python.os -lboost_python -lexiv2
scons: done building targets.</pre>
</div>
<p>The result of the build process is a shared library, <tt class="docutils literal"><span class="pre">libexiv2python.so</span></tt>, in
the build directory:</p>
<div class="highlight-python"><pre>osomon@granuja:~/dev/pyexiv2$ ls build/
exiv2wrapper.os  exiv2wrapper_python.os  libexiv2python.so</pre>
</div>
<p>To install pyexiv2 system-wide, just invoke <tt class="docutils literal"><span class="pre">scons</span> <span class="pre">install</span></tt>.
You will most likely need administrative privileges to proceed.
The <tt class="docutils literal"><span class="pre">--user</span></tt> switch will install pyexiv2 in the current
<a class="reference external" href="http://www.python.org/dev/peps/pep-0370/">user site directory</a>
(Python ≥ 2.6 is required).</p>
<p>Note to packagers:
if <a class="reference external" href="http://www.gnu.org/prep/standards/html_node/DESTDIR.html">DESTDIR</a> is
specified on the command line when invoking <tt class="docutils literal"><span class="pre">scons</span> <span class="pre">install</span></tt>, its value will be
prepended to each installed target file.</p>
</div>
<div class="section" id="windows">
<h3>Windows<a class="headerlink" href="#windows" title="Permalink to this headline"></a></h3>
<p>The top-level directory of the development branch contains a shell script named
<tt class="docutils literal"><span class="pre">cross-compile.sh</span></tt> that retrieves all the dependencies required and
cross-compiles pyexiv2 for Windows on a Linux host.
Read the comments in the header of the script to know the pre-requisites.</p>
<p>The result of the compilation is a DLL, <tt class="docutils literal"><span class="pre">libexiv2python.pyd</span></tt>, in the build
directory. This file and the <tt class="docutils literal"><span class="pre">pyexiv2</span></tt> folder in <tt class="docutils literal"><span class="pre">src</span></tt> should be copied to
the system-wide site directory of a Python 2.7 setup
(typically <tt class="docutils literal"><span class="pre">C:\Python27\Lib\site-packages\</span></tt>) or to the user site directory
(<tt class="docutils literal"><span class="pre">%APPDATA%\Python\Python27\site-packages\</span></tt>).</p>
<p>The top-level directory of the branch also contains an NSIS installer script
named <tt class="docutils literal"><span class="pre">win32-installer.nsi</span></tt>.
From the top-level directory of the branch, run the following command:</p>
<div class="highlight-python"><pre>makensis win32-installer.nsi</pre>
</div>
<p>This will generate a ready-to-distribute installer executable named
<tt class="docutils literal"><span class="pre">pyexiv2-0.3-setup.exe</span></tt>.</p>
</div>
</div>
<div class="section" id="documentation">
<h2>Documentation<a class="headerlink" href="#documentation" title="Permalink to this headline"></a></h2>
<p>The present documentation is generated using
<a class="reference external" href="http://sphinx.pocoo.org/">Sphinx</a> from reStructuredText sources found in the
doc/ directory. Invoke <tt class="docutils literal"><span class="pre">scons</span> <span class="pre">doc</span></tt> to (re)build the HTML documentation.
Alternatively, you can issue the following command:</p>
<div class="highlight-python"><pre>sphinx-build -b html doc/ doc/_build/</pre>
</div>
<p>The index of the documentation will then be found under doc/_build/index.html.</p>
</div>
<div class="section" id="unit-tests">
<h2>Unit tests<a class="headerlink" href="#unit-tests" title="Permalink to this headline"></a></h2>
<p>pyexiv2&#8217;s source comes with a battery of unit tests, in the test/ directory.
To run them, invoke <tt class="docutils literal"><span class="pre">scons</span> <span class="pre">test</span></tt>.
Alternatively, you can execute the <tt class="docutils literal"><span class="pre">TestsRunner.py</span></tt> script.</p>
</div>
<div class="section" id="contributing">
<h2>Contributing<a class="headerlink" href="#contributing" title="Permalink to this headline"></a></h2>
<p>pyexiv2 is Free Software, meaning that you are encouraged to use it, modify it
to suit your needs, contribute back improvements, and redistribute it.</p>
<p><a class="reference external" href="https://bugs.launchpad.net/pyexiv2">Bugs</a> are tracked on Launchpad.
There is a team called
<a class="reference external" href="https://launchpad.net/~pyexiv2-developers">pyexiv2-developers</a> open to anyone
interested in following development on pyexiv2. Don&#8217;t hesitate to subscribe to
the team (you don&#8217;t need to actually contribute!) and to the associated mailing
list.</p>
<p>There are several ways in which you can contribute to improve pyexiv2:</p>
<ul class="simple">
<li>Use it;</li>
<li>Give your feedback and discuss issues and feature requests on the
mailing list;</li>
<li>Report bugs, write patches;</li>
<li>Package it for your favorite distribution/OS.</li>
</ul>
<p>When reporting a bug, don&#8217;t forget to include the following information in the
report:</p>
<ul class="simple">
<li>version of pyexiv2</li>
<li>version of libexiv2 it was compiled against</li>
<li>a minimal script that reliably reproduces the issue</li>
<li>a sample image file with which the bug can reliably be reproduced</li>
</ul>
</div>
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  <h3><a href="index.html">Table Of Contents</a></h3>
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<li><a class="reference internal" href="#">Developers</a><ul>
<li><a class="reference internal" href="#getting-the-code">Getting the code</a></li>
<li><a class="reference internal" href="#dependencies">Dependencies</a></li>
<li><a class="reference internal" href="#building-and-installing">Building and installing</a><ul>
<li><a class="reference internal" href="#linux">Linux</a></li>
<li><a class="reference internal" href="#windows">Windows</a></li>
</ul>
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<li><a class="reference internal" href="#documentation">Documentation</a></li>
<li><a class="reference internal" href="#unit-tests">Unit tests</a></li>
<li><a class="reference internal" href="#contributing">Contributing</a></li>
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