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<h4>This Page</h4>
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<ul class="toc">
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<li><a href="#example">Example</a></li>
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<div class="col-sm-9 doc-styling">
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<h1><i class="glyphicon glyphicon-cog"></i> <code class="obj">add_build_program</code> <span class="sig">(<code>cls, program</code>)</span></h1>
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<ul class=page-meta>
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<li>Method of <a href="../">Environment</a></li>
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</ul>
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<p>This is very experimental API and used to register build programs for
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custom source objects. This can be used to implement virtual items. This
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works in combination with <a href="../generator/" class="ref">generator</a> and
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<a href="../urlresolver/" class="ref">urlresolver</a> and is responsible for generating
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artifacts out of source objects.</p>
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<h2 id="example">Example</h2><div class="hll"><pre><span></span><span class="kn">from</span> <span class="nn">lektor.sourceobj</span> <span class="kn">import</span> <span class="n">VirtualSourceObject</span>
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<span class="kn">from</span> <span class="nn">lektor.build_programs</span> <span class="kn">import</span> <span class="n">BuildProgram</span>
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<span class="kn">from</span> <span class="nn">lektor.utils</span> <span class="kn">import</span> <span class="n">build_url</span>
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<span class="k">class</span> <span class="nc">Source</span><span class="p">(</span><span class="n">VirtualSourceObject</span><span class="p">):</span>
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<span class="nd">@property</span>
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<span class="k">def</span> <span class="nf">path</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
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<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">record</span><span class="o">.</span><span class="n">path</span> <span class="o">+</span> <span class="s1">'@source'</span>
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<span class="nd">@property</span>
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<span class="k">def</span> <span class="nf">source_content</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
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<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">record</span><span class="o">.</span><span class="n">source_filename</span><span class="p">)</span> <span class="k">as</span> <span class="n">f</span><span class="p">:</span>
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<span class="k">return</span> <span class="n">f</span><span class="o">.</span><span class="n">read</span><span class="p">()</span><span class="o">.</span><span class="n">decode</span><span class="p">(</span><span class="s1">'utf-8'</span><span class="p">)</span>
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<span class="nd">@property</span>
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<span class="k">def</span> <span class="nf">url_path</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
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<span class="k">return</span> <span class="n">build_url</span><span class="p">([</span><span class="bp">self</span><span class="o">.</span><span class="n">record</span><span class="o">.</span><span class="n">url_path</span><span class="p">,</span> <span class="s1">'source.txt'</span><span class="p">])</span>
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<span class="k">class</span> <span class="nc">SourceBuildProgram</span><span class="p">(</span><span class="n">BuildProgram</span><span class="p">):</span>
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<span class="k">def</span> <span class="nf">produce_artifacts</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">declare_artifact</span><span class="p">(</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">source</span><span class="o">.</span><span class="n">url_path</span><span class="p">,</span>
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<span class="n">sources</span><span class="o">=</span><span class="nb">list</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">source</span><span class="o">.</span><span class="n">iter_source_filenames</span><span class="p">()))</span>
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<span class="k">def</span> <span class="nf">build_artifact</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">artifact</span><span class="p">):</span>
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<span class="n">artifact</span><span class="o">.</span><span class="n">render_template_into</span><span class="p">(</span><span class="s1">'view_source.html'</span><span class="p">,</span>
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<span class="n">this</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">source</span><span class="p">)</span>
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<span class="n">env</span><span class="o">.</span><span class="n">add_build_program</span><span class="p">(</span><span class="n">Source</span><span class="p">,</span> <span class="n">SourceBuildProgram</span><span class="p">)</span>
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<span class="nd">@env</span><span class="o">.</span><span class="n">virtualpathresolver</span><span class="p">(</span><span class="s1">'source'</span><span class="p">)</span>
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<span class="k">def</span> <span class="nf">resolve_virtual_path</span><span class="p">(</span><span class="n">record</span><span class="p">,</span> <span class="n">pieces</span><span class="p">):</span>
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<span class="k">if</span> <span class="ow">not</span> <span class="n">pieces</span><span class="p">:</span>
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<span class="k">return</span> <span class="n">Source</span><span class="p">(</span><span class="n">record</span><span class="p">)</span>
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</pre></div>
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<p>And here the example <code>view_source.html</code> template:</p>
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<div class="hll"><pre><span></span><span class="p"><</span><span class="nt">h2</span><span class="p">></span>Source for <span class="cp">{{</span> <span class="nv">this.parent.path</span> <span class="cp">}}</span><span class="p"></</span><span class="nt">h2</span><span class="p">></span>
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<span class="p"><</span><span class="nt">pre</span><span class="p">></span><span class="cp">{{</span> <span class="nv">this.source_content</span> <span class="cp">}}</span><span class="p"></</span><span class="nt">pre</span><span class="p">></span>
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</pre></div>
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