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<section id="writing-a-search-provider">
<h1>Writing a Search Provider<a class="headerlink" href="#writing-a-search-provider" title="Permalink to this headline">#</a></h1>
<p>Search is a central concept in the GNOME user experience. The search entry in
the shell overview is the place to go for quick searches.</p>
<p>A search provider is a mechanism by which an application can expose its search
capabilities to GNOME Shell. When the user types anything in the shell’s search
entry, the text is forwarded to all known search providers, and the results are
relayed back for display.</p>
<p>In the shell overview, search hits are grouped against their respective
applications and a maximum of three is shown per application. The user can
either select an individual result, in which case the application <em>SHOULD</em> open
it; or she can select the application icon, in which case it <em>COULD</em> show an
in-app view of all the results from this specific application without any
limitation.</p>
<p>The exact meaning of open depends on the application in question. Files and
Documents offer a preview of the item’s content; Software shows an UI to install
the application; and Terminal windows are simply brought into focus. If
possible, the applications SHOULD offer a way to go ‘back’ to its search view,
which should be pre-populated with the same search that was done in the shell.
This lets the user continue to refine his search inside the application.</p>
<p>Applications should be prepared to handle repeated queries as the user types
more characters into the shell search entry.</p>
<section id="basics">
<h2>Basics<a class="headerlink" href="#basics" title="Permalink to this headline">#</a></h2>
<p>For an application to become a search provider, it should implement the
following D-Bus interface:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o">&lt;</span><span class="n">node</span><span class="o">&gt;</span>
<span class="o">&lt;</span><span class="n">interface</span> <span class="n">name</span><span class="o">=</span><span class="s2">&quot;org.gnome.Shell.SearchProvider2&quot;</span><span class="o">&gt;</span>
<span class="o">&lt;</span><span class="n">method</span> <span class="n">name</span><span class="o">=</span><span class="s2">&quot;GetInitialResultSet&quot;</span><span class="o">&gt;</span>
<span class="o">&lt;</span><span class="n">arg</span> <span class="nb">type</span><span class="o">=</span><span class="s2">&quot;as&quot;</span> <span class="n">name</span><span class="o">=</span><span class="s2">&quot;terms&quot;</span> <span class="n">direction</span><span class="o">=</span><span class="s2">&quot;in&quot;</span> <span class="o">/&gt;</span>
<span class="o">&lt;</span><span class="n">arg</span> <span class="nb">type</span><span class="o">=</span><span class="s2">&quot;as&quot;</span> <span class="n">name</span><span class="o">=</span><span class="s2">&quot;results&quot;</span> <span class="n">direction</span><span class="o">=</span><span class="s2">&quot;out&quot;</span> <span class="o">/&gt;</span>
<span class="o">&lt;/</span><span class="n">method</span><span class="o">&gt;</span>
<span class="o">&lt;</span><span class="n">method</span> <span class="n">name</span><span class="o">=</span><span class="s2">&quot;GetSubsearchResultSet&quot;</span><span class="o">&gt;</span>
<span class="o">&lt;</span><span class="n">arg</span> <span class="nb">type</span><span class="o">=</span><span class="s2">&quot;as&quot;</span> <span class="n">name</span><span class="o">=</span><span class="s2">&quot;previous_results&quot;</span> <span class="n">direction</span><span class="o">=</span><span class="s2">&quot;in&quot;</span> <span class="o">/&gt;</span>
<span class="o">&lt;</span><span class="n">arg</span> <span class="nb">type</span><span class="o">=</span><span class="s2">&quot;as&quot;</span> <span class="n">name</span><span class="o">=</span><span class="s2">&quot;terms&quot;</span> <span class="n">direction</span><span class="o">=</span><span class="s2">&quot;in&quot;</span> <span class="o">/&gt;</span>
<span class="o">&lt;</span><span class="n">arg</span> <span class="nb">type</span><span class="o">=</span><span class="s2">&quot;as&quot;</span> <span class="n">name</span><span class="o">=</span><span class="s2">&quot;results&quot;</span> <span class="n">direction</span><span class="o">=</span><span class="s2">&quot;out&quot;</span> <span class="o">/&gt;</span>
<span class="o">&lt;/</span><span class="n">method</span><span class="o">&gt;</span>
<span class="o">&lt;</span><span class="n">method</span> <span class="n">name</span><span class="o">=</span><span class="s2">&quot;GetResultMetas&quot;</span><span class="o">&gt;</span>
<span class="o">&lt;</span><span class="n">arg</span> <span class="nb">type</span><span class="o">=</span><span class="s2">&quot;as&quot;</span> <span class="n">name</span><span class="o">=</span><span class="s2">&quot;identifiers&quot;</span> <span class="n">direction</span><span class="o">=</span><span class="s2">&quot;in&quot;</span> <span class="o">/&gt;</span>
<span class="o">&lt;</span><span class="n">arg</span> <span class="nb">type</span><span class="o">=</span><span class="s2">&quot;aa</span><span class="si">{sv}</span><span class="s2">&quot;</span> <span class="n">name</span><span class="o">=</span><span class="s2">&quot;metas&quot;</span> <span class="n">direction</span><span class="o">=</span><span class="s2">&quot;out&quot;</span> <span class="o">/&gt;</span>
<span class="o">&lt;/</span><span class="n">method</span><span class="o">&gt;</span>
<span class="o">&lt;</span><span class="n">method</span> <span class="n">name</span><span class="o">=</span><span class="s2">&quot;ActivateResult&quot;</span><span class="o">&gt;</span>
<span class="o">&lt;</span><span class="n">arg</span> <span class="nb">type</span><span class="o">=</span><span class="s2">&quot;s&quot;</span> <span class="n">name</span><span class="o">=</span><span class="s2">&quot;identifier&quot;</span> <span class="n">direction</span><span class="o">=</span><span class="s2">&quot;in&quot;</span> <span class="o">/&gt;</span>
<span class="o">&lt;</span><span class="n">arg</span> <span class="nb">type</span><span class="o">=</span><span class="s2">&quot;as&quot;</span> <span class="n">name</span><span class="o">=</span><span class="s2">&quot;terms&quot;</span> <span class="n">direction</span><span class="o">=</span><span class="s2">&quot;in&quot;</span> <span class="o">/&gt;</span>
<span class="o">&lt;</span><span class="n">arg</span> <span class="nb">type</span><span class="o">=</span><span class="s2">&quot;u&quot;</span> <span class="n">name</span><span class="o">=</span><span class="s2">&quot;timestamp&quot;</span> <span class="n">direction</span><span class="o">=</span><span class="s2">&quot;in&quot;</span> <span class="o">/&gt;</span>
<span class="o">&lt;/</span><span class="n">method</span><span class="o">&gt;</span>
<span class="o">&lt;</span><span class="n">method</span> <span class="n">name</span><span class="o">=</span><span class="s2">&quot;LaunchSearch&quot;</span><span class="o">&gt;</span>
<span class="o">&lt;</span><span class="n">arg</span> <span class="nb">type</span><span class="o">=</span><span class="s2">&quot;as&quot;</span> <span class="n">name</span><span class="o">=</span><span class="s2">&quot;terms&quot;</span> <span class="n">direction</span><span class="o">=</span><span class="s2">&quot;in&quot;</span> <span class="o">/&gt;</span>
<span class="o">&lt;</span><span class="n">arg</span> <span class="nb">type</span><span class="o">=</span><span class="s2">&quot;u&quot;</span> <span class="n">name</span><span class="o">=</span><span class="s2">&quot;timestamp&quot;</span> <span class="n">direction</span><span class="o">=</span><span class="s2">&quot;in&quot;</span> <span class="o">/&gt;</span>
<span class="o">&lt;/</span><span class="n">method</span><span class="o">&gt;</span>
<span class="o">&lt;/</span><span class="n">interface</span><span class="o">&gt;</span>
<span class="o">&lt;/</span><span class="n">node</span><span class="o">&gt;</span>
</pre></div>
</div>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>You can also find a copy of this D-Bus interface definition at
<code class="docutils literal notranslate"><span class="pre">$(datadir)/dbus-1/interfaces/org.gnome.ShellSearchProvider2.xml</span></code></p>
</div>
<section id="registering-a-new-search-provider">
<h3>Registering a new search provider<a class="headerlink" href="#registering-a-new-search-provider" title="Permalink to this headline">#</a></h3>
<p>In order to register the search provider with GNOME Shell, you must provide a
key/value file in <code class="docutils literal notranslate"><span class="pre">$(datadir)/gnome-shell/search-providers</span></code> for your provider.</p>
<p>Let’s assume that we have an application called “Foo Bar” that is D-Bus
activatable, where “Foo” is the project-wide namespace and “Bar” is the name of the
application. Then we can create a file called <code class="docutils literal notranslate"><span class="pre">foo.bar.search-provider.ini</span></code> as:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="p">[</span><span class="n">Shell</span> <span class="n">Search</span> <span class="n">Provider</span><span class="p">]</span>
<span class="n">DesktopId</span><span class="o">=</span><span class="n">foo</span><span class="o">.</span><span class="n">Bar</span><span class="o">.</span><span class="n">desktop</span>
<span class="n">BusName</span><span class="o">=</span><span class="n">foo</span><span class="o">.</span><span class="n">Bar</span>
<span class="n">ObjectPath</span><span class="o">=/</span><span class="n">foo</span><span class="o">/</span><span class="n">Bar</span><span class="o">/</span><span class="n">SearchProvider</span>
<span class="n">Version</span><span class="o">=</span><span class="mi">2</span>
</pre></div>
</div>
<p>After you restart the Shell, the queries will now be forwarded to the search
provider using the given D-Bus name.</p>
</section>
</section>
<section id="configuration">
<h2>Configuration<a class="headerlink" href="#configuration" title="Permalink to this headline">#</a></h2>
<p>The GNOME control-center has a settings panel that allows the user to configure
which search providers to use in the shell, and in what order to show their
results. This is handled completely between the control-center and the shell,
your application is not involved other than providing the name its desktop file
in the <code class="docutils literal notranslate"><span class="pre">DesktopId</span></code> key. Both the shell and the control-center use this key to find
the icon and name to use in the UI to represent your search provider.</p>
</section>
<section id="details">
<h2>Details<a class="headerlink" href="#details" title="Permalink to this headline">#</a></h2>
<p>Keep in mind is that activating the search provider by entering text in the
shell search entry should not visibly launch the application. It is still
possible to implement the search provider in the same binary as the application
itself (which has the advantage that you can share the search implementation
between the search provider and the in-application search); just make sure that
activating the application starts it in ‘service’ mode. The <code class="docutils literal notranslate"><span class="pre">startup()</span></code>
virtual function should not open any windows, that should only be done in
<code class="docutils literal notranslate"><span class="pre">activate()</span></code> or <code class="docutils literal notranslate"><span class="pre">open()</span></code>.</p>
<p>Another point to keep in mind is that searching in the shell should not affect
the UI of your application if it is already running until the user explicitly
chooses to open (one or all) search results with the application. Once the user
does that, it is expected that you reuse the already open window and switch it
to the search view.</p>
<p>All methods of the SearchProvider interface should be implemented
asynchronously, in particular, you should handle overlapping subsearch requests,
as the user keeps typing in the shell search entry. A common way to deal with
this is to cancel the previous search request when a new one comes in.</p>
</section>
<section id="the-searchprovider-interface">
<h2>The SearchProvider interface<a class="headerlink" href="#the-searchprovider-interface" title="Permalink to this headline">#</a></h2>
<section id="getinitialresultset-as-as">
<h3><code class="docutils literal notranslate"><span class="pre">GetInitialResultSet</span></code> :: <code class="docutils literal notranslate"><span class="pre">(as)</span></code> → <code class="docutils literal notranslate"><span class="pre">(as)</span></code><a class="headerlink" href="#getinitialresultset-as-as" title="Permalink to this headline">#</a></h3>
<p><code class="docutils literal notranslate"><span class="pre">GetInitialResultSet</span></code> is called when a new search is started. It gets an array
of search terms as arguments, and should return an array of result IDs.
gnome-shell will call <code class="docutils literal notranslate"><span class="pre">GetResultMetas</span></code> for (some) of these result IDs to get
details about the result that can be be displayed in the result list.</p>
</section>
<section id="getsubsearchresultset-as-as-as">
<h3><code class="docutils literal notranslate"><span class="pre">GetSubsearchResultSet</span></code> :: <code class="docutils literal notranslate"><span class="pre">(as,as)</span></code> → <code class="docutils literal notranslate"><span class="pre">(as)</span></code><a class="headerlink" href="#getsubsearchresultset-as-as-as" title="Permalink to this headline">#</a></h3>
<p><code class="docutils literal notranslate"><span class="pre">GetSubsearchResultSet</span></code> is called to refine the initial search results when
the user types more characters in the search entry. It gets the previous search
results and the current search terms as arguments, and should return an array of
result IDs, just like <code class="docutils literal notranslate"><span class="pre">GetInitialResulSet</span></code>.</p>
</section>
<section id="getresultmetas-as-aa-sv">
<h3><code class="docutils literal notranslate"><span class="pre">GetResultMetas</span></code> :: <code class="docutils literal notranslate"><span class="pre">(as)</span></code> → <code class="docutils literal notranslate"><span class="pre">(aa{sv})</span></code><a class="headerlink" href="#getresultmetas-as-aa-sv" title="Permalink to this headline">#</a></h3>
<p><code class="docutils literal notranslate"><span class="pre">GetResultMetas</span></code> is called to obtain detailed information for results. It gets
an array of result IDs as arguments, and should return a matching array of
dictionaries (ie one a{sv} for each passed-in result ID). The following pieces
of information should be provided for each result:</p>
<ul class="simple">
<li><p>“id”: the result ID</p></li>
<li><p>“name”: the display name for the result</p></li>
<li><p>“icon”: a serialized GIcon (see <code class="docutils literal notranslate"><span class="pre">g_icon_serialize()</span></code>), or alternatively,</p></li>
<li><p>“gicon”: a textual representation of a GIcon (see <code class="docutils literal notranslate"><span class="pre">g_icon_to_string()</span></code>), or alternatively,</p></li>
<li><p>“icon-data”: a tuple of type <code class="docutils literal notranslate"><span class="pre">(iiibiiay)</span></code> describing a pixbuf with width,
height, rowstride, has-alpha, bits-per-sample, n-channels, and image data</p></li>
<li><p>“description”: an optional short description (1-2 lines)</p></li>
<li><p>“clipboardText”: an optional text to send to the clipboard on activation</p></li>
</ul>
</section>
<section id="activateresult-s-as-u">
<h3><code class="docutils literal notranslate"><span class="pre">ActivateResult</span></code> :: <code class="docutils literal notranslate"><span class="pre">(s,as,u)</span></code> → <code class="docutils literal notranslate"><span class="pre">()</span></code><a class="headerlink" href="#activateresult-s-as-u" title="Permalink to this headline">#</a></h3>
<p><code class="docutils literal notranslate"><span class="pre">ActivateResult</span></code> is called when the user clicks on an individual result to
open it in the application. The arguments are the result ID, the current search
terms and a timestamp.</p>
</section>
<section id="launchsearch-as-u">
<h3><code class="docutils literal notranslate"><span class="pre">LaunchSearch</span></code> :: <code class="docutils literal notranslate"><span class="pre">(as,u)</span></code> → <code class="docutils literal notranslate"><span class="pre">()</span></code><a class="headerlink" href="#launchsearch-as-u" title="Permalink to this headline">#</a></h3>
<p><code class="docutils literal notranslate"><span class="pre">LaunchSearch</span></code> is called when the user clicks on the provider icon to display
more search results in the application. The arguments are the current search
terms and a timestamp.</p>
</section>
</section>
<section id="implementation">
<h2>Implementation<a class="headerlink" href="#implementation" title="Permalink to this headline">#</a></h2>
<p>You can add a search provider to an application that is using GtkApplication by
exporting the GDBusInterfaceSkeleton that implementing the search provider
interface in the dbus_register() vfunc. Often the search provider is in the same
binary as the application itself because it has the advantage of being able to
share the search implementation, but this is not mandatory.</p>
<p>Let’s assume that we have an application called Foo Bar, where Foo is the
project-wide namespace and Bar is the name of the application.</p>
<p>You should generate the <code class="docutils literal notranslate"><span class="pre">GDBusInterfaceSkeleton</span></code> using <code class="docutils literal notranslate"><span class="pre">gdbus-codegen</span></code>
through the “gnome” Meson module:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">gnome</span> <span class="o">=</span> <span class="n">import</span><span class="p">(</span><span class="s1">&#39;gnome&#39;</span><span class="p">)</span>
<span class="n">sp_sources</span> <span class="o">=</span> <span class="n">gnome</span><span class="o">.</span><span class="n">gdbus_codegen</span><span class="p">(</span>
<span class="s1">&#39;shell-search-provider-generated&#39;</span><span class="p">,</span>
<span class="n">sources</span><span class="p">:</span> <span class="s1">&#39;org.gnome.Shell.SearchProvider2.xml&#39;</span><span class="p">,</span>
<span class="n">interface_prefix</span> <span class="p">:</span> <span class="s1">&#39;org.gnome.&#39;</span><span class="p">,</span>
<span class="n">namespace</span> <span class="p">:</span> <span class="s1">&#39;Bar&#39;</span><span class="p">,</span>
<span class="p">)</span>
</pre></div>
</div>
<p>Then you will need to override the <code class="docutils literal notranslate"><span class="pre">dbus_register()</span></code> and <code class="docutils literal notranslate"><span class="pre">dbus_unregister()</span></code>
virtual functions of your <code class="docutils literal notranslate"><span class="pre">GtkApplication</span></code> in order to export and unexport the
interface at the given path:</p>
<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="n">G_DEFINE_TYPE</span><span class="w"> </span><span class="p">(</span><span class="n">BarApplication</span><span class="p">,</span><span class="w"> </span><span class="n">bar_application</span><span class="p">,</span><span class="w"> </span><span class="n">GTK_TYPE_APPLICATION</span><span class="p">);</span><span class="w"></span>
<span class="k">static</span><span class="w"> </span><span class="kt">void</span><span class="w"></span>
<span class="nf">bar_application_class_init</span><span class="w"> </span><span class="p">(</span><span class="n">BarApplicationClass</span><span class="w"> </span><span class="o">*</span><span class="n">class</span><span class="p">)</span><span class="w"></span>
<span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="n">GApplicationClass</span><span class="w"> </span><span class="o">*</span><span class="n">application_class</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">G_APPLICATION_CLASS</span><span class="w"> </span><span class="p">(</span><span class="n">class</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="n">application_class</span><span class="o">-&gt;</span><span class="n">dbus_register</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">bar_application_dbus_register</span><span class="p">;</span><span class="w"></span>
<span class="w"> </span><span class="n">application_class</span><span class="o">-&gt;</span><span class="n">dbus_unregister</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">bar_application_dbus_unregister</span><span class="p">;</span><span class="w"></span>
<span class="p">}</span><span class="w"></span>
<span class="n">GtkApplication</span><span class="w"> </span><span class="o">*</span><span class="w"></span>
<span class="nf">bar_application_new</span><span class="w"> </span><span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="w"></span>
<span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">g_object_new</span><span class="w"> </span><span class="p">(</span><span class="n">BAR_TYPE_APPLICATION</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="s">&quot;application-id&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;foo.bar&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nb">NULL</span><span class="p">);</span><span class="w"></span>
<span class="p">}</span><span class="w"></span>
<span class="k">static</span><span class="w"> </span><span class="n">gboolean</span><span class="w"></span>
<span class="nf">bar_application_dbus_register</span><span class="w"> </span><span class="p">(</span><span class="n">GApplication</span><span class="w"> </span><span class="o">*</span><span class="n">application</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="n">GDBusConnection</span><span class="w"> </span><span class="o">*</span><span class="n">connection</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">gchar</span><span class="w"> </span><span class="o">*</span><span class="n">object_path</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="n">GError</span><span class="w"> </span><span class="o">**</span><span class="n">error</span><span class="p">)</span><span class="w"></span>
<span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="n">BarApplication</span><span class="w"> </span><span class="o">*</span><span class="n">self</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">BAR_APPLICATION</span><span class="w"> </span><span class="p">(</span><span class="n">application</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="c1">// Chain up to the parent&#39;s implementation</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="o">!</span><span class="n">G_APPLICATION_CLASS</span><span class="w"> </span><span class="p">(</span><span class="n">bar_application_parent_class</span><span class="p">)</span><span class="w"></span>
<span class="w"> </span><span class="o">-&gt;</span><span class="n">dbus_register</span><span class="w"> </span><span class="p">(</span><span class="n">application</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="n">connection</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="n">object_path</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="n">error</span><span class="p">))</span><span class="w"></span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">FALSE</span><span class="p">;</span><span class="w"></span>
<span class="w"> </span><span class="n">g_autofree</span><span class="w"> </span><span class="n">search_provider_path</span><span class="w"> </span><span class="o">=</span><span class="w"></span>
<span class="w"> </span><span class="n">g_strconcat</span><span class="w"> </span><span class="p">(</span><span class="n">object_path</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;/SearchProvider&quot;</span><span class="p">,</span><span class="w"> </span><span class="nb">NULL</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="c1">// Export the SearchProvider interface to the given path</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="o">!</span><span class="n">bar_search_provider_dbus_export</span><span class="w"> </span><span class="p">(</span><span class="n">self</span><span class="o">-&gt;</span><span class="n">search_provider</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="n">connection</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="n">search_provider_path</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="n">error</span><span class="p">))</span><span class="w"></span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">FALSE</span><span class="p">;</span><span class="w"></span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">TRUE</span><span class="p">;</span><span class="w"></span>
<span class="p">}</span><span class="w"></span>
<span class="k">static</span><span class="w"> </span><span class="kt">void</span><span class="w"></span>
<span class="nf">bar_application_dbus_unregister</span><span class="w"> </span><span class="p">(</span><span class="n">GApplication</span><span class="w"> </span><span class="o">*</span><span class="n">application</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="n">GDBusConnection</span><span class="w"> </span><span class="o">*</span><span class="n">connection</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">gchar</span><span class="w"> </span><span class="o">*</span><span class="n">object_path</span><span class="p">)</span><span class="w"></span>
<span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="n">BarApplication</span><span class="w"> </span><span class="o">*</span><span class="n">self</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">BAR_APPLICATION</span><span class="w"> </span><span class="p">(</span><span class="n">application</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="n">g_autofree</span><span class="w"> </span><span class="kt">char</span><span class="w"> </span><span class="o">*</span><span class="n">search_provider_path</span><span class="w"> </span><span class="o">=</span><span class="w"></span>
<span class="w"> </span><span class="n">g_strconcat</span><span class="w"> </span><span class="p">(</span><span class="n">object_path</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;/SearchProvider&quot;</span><span class="p">,</span><span class="w"> </span><span class="nb">NULL</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="n">bar_search_provider_dbus_unexport</span><span class="w"> </span><span class="p">(</span><span class="n">self</span><span class="o">-&gt;</span><span class="n">search_provider</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="n">connection</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="n">search_provider_path</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="n">G_APPLICATION_CLASS</span><span class="w"> </span><span class="p">(</span><span class="n">bar_application_parent_class</span><span class="p">)</span><span class="w"></span>
<span class="w"> </span><span class="o">-&gt;</span><span class="n">dbus_unregister</span><span class="w"> </span><span class="p">(</span><span class="n">application</span><span class="p">,</span><span class="w"> </span><span class="n">connection</span><span class="p">,</span><span class="w"> </span><span class="n">object_path</span><span class="p">);</span><span class="w"></span>
<span class="p">}</span><span class="w"></span>
</pre></div>
</div>
<p>You will need to create a search provider object as the implementation of the
interface:</p>
<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="n">G_DECLARE_FINAL_TYPE</span><span class="w"> </span><span class="p">(</span><span class="n">BarSearchProvider</span><span class="p">,</span><span class="w"> </span><span class="n">bar_search_provider</span><span class="p">,</span><span class="w"> </span><span class="n">BAR</span><span class="p">,</span><span class="w"> </span><span class="n">SEARCH_PROVIDER</span><span class="p">,</span><span class="w"> </span><span class="n">GObject</span><span class="p">)</span><span class="w"></span>
<span class="k">struct</span><span class="w"> </span><span class="nc">_BarSearchProvider</span><span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="n">GObject</span><span class="w"> </span><span class="n">parent_instance</span><span class="p">;</span><span class="w"></span>
<span class="w"> </span><span class="n">ShellSearchProvider2</span><span class="w"> </span><span class="o">*</span><span class="n">skeleton</span><span class="p">;</span><span class="w"></span>
<span class="p">};</span><span class="w"></span>
<span class="n">G_DEFINE_TYPE</span><span class="w"> </span><span class="p">(</span><span class="n">BarSearchProvider</span><span class="p">,</span><span class="w"> </span><span class="n">bar_search_provider</span><span class="p">,</span><span class="w"> </span><span class="n">G_TYPE_OBJECT</span><span class="p">)</span><span class="w"></span>
<span class="k">static</span><span class="w"> </span><span class="kt">void</span><span class="w"></span>
<span class="n">bar_search_provider_init</span><span class="w"> </span><span class="p">(</span><span class="n">BarSearchProvider</span><span class="w"> </span><span class="o">*</span><span class="n">self</span><span class="p">)</span><span class="w"></span>
<span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="n">self</span><span class="o">-&gt;</span><span class="n">skeleton</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">shell_search_provider2_skeleton_new</span><span class="w"> </span><span class="p">();</span><span class="w"></span>
<span class="w"> </span><span class="n">g_signal_connect_swapped</span><span class="w"> </span><span class="p">(</span><span class="n">self</span><span class="o">-&gt;</span><span class="n">skeleton</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="s">&quot;handle-activate-result&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="n">G_CALLBACK</span><span class="w"> </span><span class="p">(</span><span class="n">bar_search_provider_activate_result</span><span class="p">),</span><span class="w"></span>
<span class="w"> </span><span class="n">self</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="n">g_signal_connect_swapped</span><span class="w"> </span><span class="p">(</span><span class="n">self</span><span class="o">-&gt;</span><span class="n">skeleton</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="s">&quot;handle-get-initial-result-set&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="n">G_CALLBACK</span><span class="w"> </span><span class="p">(</span><span class="n">bar_search_provider_get_initial_result_set</span><span class="p">),</span><span class="w"></span>
<span class="w"> </span><span class="n">self</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="n">g_signal_connect_swapped</span><span class="w"> </span><span class="p">(</span><span class="n">self</span><span class="o">-&gt;</span><span class="n">skeleton</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="s">&quot;handle-get-subsearch-result-set&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="n">G_CALLBACK</span><span class="w"> </span><span class="p">(</span><span class="n">bar_search_provider_get_subsearch_result_set</span><span class="p">),</span><span class="w"></span>
<span class="w"> </span><span class="n">self</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="n">g_signal_connect_swapped</span><span class="w"> </span><span class="p">(</span><span class="n">self</span><span class="o">-&gt;</span><span class="n">skeleton</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="s">&quot;handle-get-result-metas&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="n">G_CALLBACK</span><span class="w"> </span><span class="p">(</span><span class="n">bar_search_provider_get_result_metas</span><span class="p">),</span><span class="w"></span>
<span class="w"> </span><span class="n">self</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="n">g_signal_connect_swapped</span><span class="w"> </span><span class="p">(</span><span class="n">self</span><span class="o">-&gt;</span><span class="n">skeleton</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="s">&quot;handle-launch-search&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="n">G_CALLBACK</span><span class="w"> </span><span class="p">(</span><span class="n">bar_search_provider_launch_search</span><span class="p">),</span><span class="w"></span>
<span class="w"> </span><span class="n">self</span><span class="p">);</span><span class="w"></span>
<span class="p">}</span><span class="w"></span>
</pre></div>
</div>
<div class="admonition important">
<p class="admonition-title">Important</p>
<p>If your D-Bus method handlers are asynchronous, then you should hold a
reference to BarApplication using <code class="docutils literal notranslate"><span class="pre">g_application_hold()</span></code> and then release
the reference using <code class="docutils literal notranslate"><span class="pre">g_application_release()</span></code> when you are done. Use the
corresponding <code class="docutils literal notranslate"><span class="pre">shell_search_provider2_complete*</span></code> methods to indicate
completion and send back results, if any.</p>
</div>
<p>Here’s a pair of convenience wrapper methods for exporting and unexporting the
skeleton:</p>
<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="n">gboolean</span><span class="w"></span>
<span class="nf">bar_search_provider_dbus_export</span><span class="w"> </span><span class="p">(</span><span class="n">BarSearchProvider</span><span class="w"> </span><span class="o">*</span><span class="n">self</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="n">GDBusConnection</span><span class="w"> </span><span class="o">*</span><span class="n">connection</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">gchar</span><span class="w"> </span><span class="o">*</span><span class="n">object_path</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="n">GError</span><span class="w"> </span><span class="o">**</span><span class="n">error</span><span class="p">)</span><span class="w"></span>
<span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">g_dbus_interface_skeleton_export</span><span class="w"> </span><span class="p">(</span><span class="w"></span>
<span class="w"> </span><span class="n">G_DBUS_INTERFACE_SKELETON</span><span class="w"> </span><span class="p">(</span><span class="n">self</span><span class="o">-&gt;</span><span class="n">skeleton</span><span class="p">),</span><span class="w"></span>
<span class="w"> </span><span class="n">connection</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="n">object_path</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="n">error</span><span class="p">);</span><span class="w"></span>
<span class="p">}</span><span class="w"></span>
<span class="kt">void</span><span class="w"></span>
<span class="nf">bar_search_provider_dbus_unexport</span><span class="w"> </span><span class="p">(</span><span class="n">BarSearchProvider</span><span class="w"> </span><span class="o">*</span><span class="n">self</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="n">GDBusConnection</span><span class="w"> </span><span class="o">*</span><span class="n">connection</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">gchar</span><span class="w"> </span><span class="o">*</span><span class="n">object_path</span><span class="p">)</span><span class="w"></span>
<span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">g_dbus_interface_skeleton_has_connection</span><span class="w"> </span><span class="p">(</span><span class="w"></span>
<span class="w"> </span><span class="n">G_DBUS_INTERFACE_SKELETON</span><span class="w"> </span><span class="p">(</span><span class="n">self</span><span class="o">-&gt;</span><span class="n">skeleton</span><span class="p">),</span><span class="w"></span>
<span class="w"> </span><span class="n">connection</span><span class="p">))</span><span class="w"></span>
<span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="n">g_dbus_interface_skeleton_unexport_from_connection</span><span class="w"> </span><span class="p">(</span><span class="w"></span>
<span class="w"> </span><span class="n">G_DBUS_INTERFACE_SKELETON</span><span class="w"> </span><span class="p">(</span><span class="n">self</span><span class="o">-&gt;</span><span class="n">skeleton</span><span class="p">),</span><span class="w"></span>
<span class="w"> </span><span class="n">connection</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="p">}</span><span class="w"></span>
<span class="p">}</span><span class="w"></span>
</pre></div>
</div>
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<span class="toc-title">
Contents
</span>
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<div class="toc-tree-container">
<div class="toc-tree">
<ul>
<li><a class="reference internal" href="#">Writing a Search Provider</a><ul>
<li><a class="reference internal" href="#basics">Basics</a><ul>
<li><a class="reference internal" href="#registering-a-new-search-provider">Registering a new search provider</a></li>
</ul>
</li>
<li><a class="reference internal" href="#configuration">Configuration</a></li>
<li><a class="reference internal" href="#details">Details</a></li>
<li><a class="reference internal" href="#the-searchprovider-interface">The SearchProvider interface</a><ul>
<li><a class="reference internal" href="#getinitialresultset-as-as"><code class="docutils literal notranslate"><span class="pre">GetInitialResultSet</span></code> :: <code class="docutils literal notranslate"><span class="pre">(as)</span></code> → <code class="docutils literal notranslate"><span class="pre">(as)</span></code></a></li>
<li><a class="reference internal" href="#getsubsearchresultset-as-as-as"><code class="docutils literal notranslate"><span class="pre">GetSubsearchResultSet</span></code> :: <code class="docutils literal notranslate"><span class="pre">(as,as)</span></code> → <code class="docutils literal notranslate"><span class="pre">(as)</span></code></a></li>
<li><a class="reference internal" href="#getresultmetas-as-aa-sv"><code class="docutils literal notranslate"><span class="pre">GetResultMetas</span></code> :: <code class="docutils literal notranslate"><span class="pre">(as)</span></code> → <code class="docutils literal notranslate"><span class="pre">(aa{sv})</span></code></a></li>
<li><a class="reference internal" href="#activateresult-s-as-u"><code class="docutils literal notranslate"><span class="pre">ActivateResult</span></code> :: <code class="docutils literal notranslate"><span class="pre">(s,as,u)</span></code> → <code class="docutils literal notranslate"><span class="pre">()</span></code></a></li>
<li><a class="reference internal" href="#launchsearch-as-u"><code class="docutils literal notranslate"><span class="pre">LaunchSearch</span></code> :: <code class="docutils literal notranslate"><span class="pre">(as,u)</span></code> → <code class="docutils literal notranslate"><span class="pre">()</span></code></a></li>
</ul>
</li>
<li><a class="reference internal" href="#implementation">Implementation</a></li>
</ul>
</li>
</ul>
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