<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <link rel="stylesheet" href="../../../../static/styles.css?h=ae0cc228"> <link rel="stylesheet" href="../../../../static/pygments.css"> <link rel="shortcut icon" href="../../../../static/favicon.png?h=fa09bedd"> <title>add_build_program | Documentation | Lektor Static Content Management System</title> </head> <body class="default"> <nav class="navbar navbar-inverse navbar-static-top"> <div class="container"> <div class="navbar-header"> <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar"> <span class="sr-only">Toggle navigation</span> <span class="icon-bar"></span> <span class="icon-bar"></span> <span class="icon-bar"></span> </button> <a class="navbar-brand" href="../../../../">Lektor</a> </div> <div id="navbar" class="collapse navbar-collapse"> <ul class="nav navbar-nav"> <li><a href="../../../../downloads/">Download</a></li> <li class="active"><a href="../../../">Documentation</a></li> <li><a href="../../../../showcase/">Showcase</a></li> <li><a href="../../../../plugins/">Plugins</a></li> <li><a href="../../../../community/">Community</a></li> <li><a href="../../../../blog/">Blog</a></li> </ul> </div> </div> </nav> <div class="body-wrapper"> <div class="container"> <div class="row"> <div class="col-sm-3"> <ul class="tree-nav nocontent"> <li><a href="../../../">Welcome</a></li> <li><a href="../../../what/">What is Lektor</a> <li><a href="../../../installation/">Installation</a> <li><a href="../../../quickstart/">Quickstart</a> <li><a href="../../../project/">Project</a> <li><a href="../../../content/">Content</a> <li><a href="../../../templates/">Templates</a> <li><a href="../../../themes/">Themes</a> <li><a href="../../../guides/">Guides</a> <li><a href="../../../deployment/">Deployment</a> <li><a href="../../../plugins/">Plugins</a> <li><a href="../../../models/">Data Modelling</a> <li><a href="../../../cli/">Command Line</a> <li><a href="../../">API</a> <ul> <li><a href="../../build/">Build System</a> <li><a href="../../databags/">Databags</a> <li><a href="../../db/">Database</a> <li><a href="../">Environment</a> <ul> <li class="active"><a href="./">add_build_program()</a> <ul></ul> <li><a href="../add-publisher/">add_publisher()</a> <li><a href="../add-type/">add_type()</a> <li><a href="../generator/">generator()</a> <li><a href="../jinja-env/">jinja_env</a> <li><a href="../load-config/">load_config()</a> <li><a href="../load-plugins/">load_plugins()</a> <li><a href="../new-pad/">new_pad()</a> <li><a href="../render-template/">render_template()</a> <li><a href="../urlresolver/">urlresolver()</a> <li><a href="../virtualpathresolver/">virtualpathresolver()</a> </ul> <li><a href="../../plugins/">Plugins</a> <li><a href="../../project/">Project</a> <li><a href="../../publisher/">Publisher</a> <li><a href="../../templates/">Template API</a> <li><a href="../../utils/">Utilities</a> </ul> <li><a href="../../../search/">Search</a> </ul> <div class="visible-md-block visible-lg-block"> <h4>This Page</h4> <ul class="toc"> <li><a href="#example">Example</a></li> </ul> </div> </div> <div class="col-sm-9 doc-styling"> <h1><i class="glyphicon glyphicon-cog"></i> <code class="obj">add_build_program</code> <span class="sig">(<code>cls,</code> <code>program</code>)</span></h1> <ul class=page-meta> <li>Method of <a href="../">Environment</a></li> </ul> <p>This is very experimental API and used to register build programs for custom source objects. This can be used to implement virtual items. This works in combination with <a href="../generator/" class="ref">generator</a> and <a href="../urlresolver/" class="ref">urlresolver</a> and is responsible for generating artifacts out of source objects.</p> <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> <span class="kn">from</span> <span class="nn">lektor.build_programs</span> <span class="kn">import</span> <span class="n">BuildProgram</span> <span class="kn">from</span> <span class="nn">lektor.utils</span> <span class="kn">import</span> <span class="n">build_url</span> <span class="k">class</span> <span class="nc">Source</span><span class="p">(</span><span class="n">VirtualSourceObject</span><span class="p">):</span> <span class="nd">@property</span> <span class="k">def</span> <span class="nf">path</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <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> <span class="nd">@property</span> <span class="k">def</span> <span class="nf">source_content</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <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> <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> <span class="nd">@property</span> <span class="k">def</span> <span class="nf">url_path</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <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> <span class="k">class</span> <span class="nc">SourceBuildProgram</span><span class="p">(</span><span class="n">BuildProgram</span><span class="p">):</span> <span class="k">def</span> <span class="nf">produce_artifacts</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="bp">self</span><span class="o">.</span><span class="n">declare_artifact</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">url_path</span><span class="p">,</span> <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> <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> <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> <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> <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> <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> <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> <span class="k">if</span> <span class="ow">not</span> <span class="n">pieces</span><span class="p">:</span> <span class="k">return</span> <span class="n">Source</span><span class="p">(</span><span class="n">record</span><span class="p">)</span> </pre></div> <p>And here the example <code>view_source.html</code> template:</p> <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> <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> </pre></div> <div class="comment-box"> <h2>Comments</h2> <div id="disqus_thread"></div> <script> var disqus_config = function() { this.page.identifier = "/docs/api/environment/add-build-program"; this.page.url = "https://www.getlektor.com/docs/api/environment/add-build-program/"; }; (function() { var d = document, s = d.createElement('script'); s.src = '//lektordocumentation.disqus.com/embed.js'; s.setAttribute('data-timestamp', +new Date()); (d.head || d.body).appendChild(s); })(); </script> <noscript> Please enable JavaScript to view the <a 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