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<h4>This Page</h4>
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<li><a href="#example">Example</a></li>
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<h1><i class="glyphicon glyphicon-cog"></i> <code class="obj">publish</code>
<span class="sig">(<code>target_url,</code> <code>credentials=None,</code> <code>**extra</code>)</span></h1>
<ul class=page-meta>
<li>Method of <a href="../">Publisher</a></li>
<li>New in Lektor Version <em>2.0</em></li>
</ul>
<p>This method implements the actual publishing process. It's supposed to
implement a generator that reports the progress of the publishing. If at any
point something happens that would cause an error for the deployment this can
be signalled with the <a href="../fail/" class="ref">fail</a> method which aborts the execution
and reports an error.</p>
<p>The parameters to the function are as follows:</p>
<ul>
<li><code>target_url</code>: a URL object with the parsed URL. This object comes from the
Werkzeug library and gives access to the individual parts of a URL by the
exposed attributes (<a href="https://werkzeug.palletsprojects.com/en/2.0.x/urls/" class="ext">Read about the URL object</a>).</li>
<li><code>credentials</code>: an optional dictionary with command line supplied credentials.
Note that these credentials might be completely absent and the keys which are
provided might change with future versions of Lektor.</li>
<li><code>**extra</code>: for forwards compatibility publishers are required to ignore extra
keyword arguments.</li>
</ul>
<p>Each line in the generator must be a string which is then either logged to
the output in the console or in the deploy/publish window in the admin UI.</p>
<h2 id="example">Example</h2><p>This example implements a simple publisher that just copies all built files
into a new location.</p>
<div class="hll"><pre><span></span><span class="kn">import</span> <span class="nn">os</span>
<span class="kn">import</span> <span class="nn">shutil</span>
<span class="kn">from</span> <span class="nn">lektor.publisher</span> <span class="kn">import</span> <span class="n">Publisher</span>
<span class="k">class</span> <span class="nc">CopyPublisher</span><span class="p">(</span><span class="n">Publisher</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">publish</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">target_url</span><span class="p">,</span> <span class="n">credentials</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="o">**</span><span class="n">extra</span><span class="p">):</span>
<span class="n">src_path</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">output_path</span>
<span class="n">dst_path</span> <span class="o">=</span> <span class="n">target_url</span><span class="o">.</span><span class="n">path</span>
<span class="n">strip</span> <span class="o">=</span> <span class="nb">len</span><span class="p">(</span><span class="n">src_path</span><span class="p">)</span> <span class="o">+</span> <span class="mi">1</span>
<span class="k">for</span> <span class="n">path</span><span class="p">,</span> <span class="n">folders</span><span class="p">,</span> <span class="n">filenames</span> <span class="ow">in</span> <span class="n">os</span><span class="o">.</span><span class="n">walk</span><span class="p">(</span><span class="n">src_path</span><span class="p">):</span>
<span class="c1"># Ignore the .lektor folder.</span>
<span class="n">folders</span><span class="p">[:]</span> <span class="o">=</span> <span class="p">[</span><span class="n">x</span> <span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="n">folders</span> <span class="k">if</span> <span class="n">x</span> <span class="o">!=</span> <span class="s1">&#39;.lektor&#39;</span><span class="p">]</span>
<span class="c1"># Copy all files over</span>
<span class="k">for</span> <span class="n">filename</span> <span class="ow">in</span> <span class="n">filenames</span><span class="p">:</span>
<span class="n">full_path</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">src_path</span><span class="p">,</span> <span class="n">path</span><span class="p">,</span> <span class="n">filename</span><span class="p">)</span>
<span class="n">dst</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">path</span><span class="p">,</span> <span class="n">full_path</span><span class="p">[</span><span class="n">strip</span><span class="p">:])</span>
<span class="c1"># Make sure the destination folder exists.</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">os</span><span class="o">.</span><span class="n">makedirs</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">dirname</span><span class="p">(</span><span class="n">dst</span><span class="p">))</span>
<span class="k">except</span> <span class="p">(</span><span class="ne">OSError</span><span class="p">,</span> <span class="ne">IOError</span><span class="p">):</span>
<span class="k">pass</span>
<span class="c1"># Copy the file</span>
<span class="k">yield</span> <span class="s1">&#39;Copy </span><span class="si">%s</span><span class="s1">&#39;</span> <span class="o">%</span> <span class="n">filename</span>
<span class="n">shutil</span><span class="o">.</span><span class="n">copy</span><span class="p">(</span><span class="n">full_path</span><span class="p">,</span> <span class="n">dst</span><span class="p">)</span>
<span class="k">yield</span> <span class="s1">&#39;Done&#39;</span>
<span class="k">class</span> <span class="nc">MyPlugin</span><span class="p">(</span><span class="n">Plugin</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">on_setup_env</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">**</span><span class="n">extra</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">env</span><span class="o">.</span><span class="n">add_publisher</span><span class="p">(</span><span class="s1">&#39;copy&#39;</span><span class="p">,</span> <span class="n">CopyPublisher</span><span class="p">)</span>
</pre></div>
<p>This publisher registers with the <code>copy</code> scheme and could be used like this:</p>
<div class="hll"><pre><span></span><span class="na">target_url</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">copy:///path/to/destination/folder</span>
</pre></div>
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