doc: Improve code listings

By adding prompts and removing unnecessary indentation.

doc/builders/images/dockertools.xml

@@ -132,11 +132,11 @@ buildImage {
    <para>
     By default <function>buildImage</function> will use a static date of one second past the UNIX Epoch. This allows <function>buildImage</function> to produce binary reproducible images. When listing images with <command>docker images</command>, the newly created images will be listed like this:
    </para>
-<screen><![CDATA[
-$ docker images
+<screen>
+<prompt>$ </prompt>docker images
 REPOSITORY   TAG      IMAGE ID       CREATED        SIZE
 hello        latest   08c791c7846e   48 years ago   25.2MB
-]]></screen>
+</screen>
    <para>
     You can break binary reproducibility but have a sorted, meaningful <literal>CREATED</literal> column by setting <literal>created</literal> to <literal>now</literal>.
    </para>
@@ -152,11 +152,11 @@ pkgs.dockerTools.buildImage {
 ]]></programlisting>
    <para>
     and now the Docker CLI will display a reasonable date and sort the images as expected:
-<screen><![CDATA[
-$ docker images
+<screen>
+<prompt>$ </prompt>docker images
 REPOSITORY   TAG      IMAGE ID       CREATED              SIZE
 hello        latest   de2bf4786de6   About a minute ago   25.2MB
-]]></screen>
+</screen>
     however, the produced images will not be binary reproducible.
    </para>
   </example>

doc/builders/images/ocitools.xml

@@ -38,8 +38,7 @@ buildContainer {
 
   readonly = false; <co xml:id='ex-ociTools-buildContainer-3' />
 }
-
-    </programlisting>
+</programlisting>
    <calloutlist>
     <callout arearefs='ex-ociTools-buildContainer-1'>
      <para>

doc/builders/packages/citrix.xml

@@ -22,10 +22,10 @@
   </para>
   <para>
    In order to set this up, you first have to <link xlink:href="https://its.uiowa.edu/support/article/102186">download the <literal>.cr</literal> file from the Netscaler Gateway</link>. After that you can configure the <command>selfservice</command> like this:
-   <screen>
-    <prompt>$ </prompt>storebrowse -C ~/Downloads/receiverconfig.cr
-    <prompt>$ </prompt>selfservice
-   </screen>
+<screen>
+<prompt>$ </prompt>storebrowse -C ~/Downloads/receiverconfig.cr
+<prompt>$ </prompt>selfservice
+</screen>
   </para>
  </section>
 

doc/builders/packages/urxvt.xml

@@ -18,10 +18,13 @@
    includes all available plugins. To make use of this functionality, use an
    overlay or directly install an expression that overrides its configuration,
    such as
-   <programlisting>rxvt-unicode.override { configure = { availablePlugins, ... }: {
+<programlisting>
+rxvt-unicode.override {
+  configure = { availablePlugins, ... }: {
     plugins = with availablePlugins; [ perls resize-font vtwheel ];
-  }
-}</programlisting>
+  };
+}
+</programlisting>
    If the <literal>configure</literal> function returns an attrset without the
    <literal>plugins</literal> attribute, <literal>availablePlugins</literal>
    will be used automatically.
@@ -30,18 +33,22 @@
   <para>
    In order to add plugins but also keep all default plugins installed, it is
    possible to use the following method:
-   <programlisting>rxvt-unicode.override { configure = { availablePlugins, ... }: {
-     plugins = (builtins.attrValues availablePlugins) ++ [ custom-plugin ];
-   };
-}</programlisting>
+<programlisting>
+rxvt-unicode.override {
+  configure = { availablePlugins, ... }: {
+    plugins = (builtins.attrValues availablePlugins) ++ [ custom-plugin ];
+  };
+}
+</programlisting>
   </para>
 
   <para>
    To get a list of all the plugins available, open the Nix REPL and run
-   <programlisting>$ nix repl
+<screen>
+<prompt>$ </prompt>nix repl
 :l &lt;nixpkgs&gt;
 map (p: p.name) pkgs.rxvt-unicode.plugins
-   </programlisting>
+</screen>
    Alternatively, if your shell is bash or zsh and have completion enabled,
    simply type <literal>nixpkgs.rxvt-unicode.plugins.&lt;tab&gt;</literal>.
   </para>
@@ -53,18 +60,24 @@ map (p: p.name) pkgs.rxvt-unicode.plugins
     <literal>extraDeps</literal> can be used, for example, to provide
     <literal>xsel</literal> (a clipboard manager) to the clipboard plugin,
     without installing it globally:
-    <programlisting>rxvt-unicode.override { configure = { availablePlugins, ... }: {
-     pluginsDeps = [ xsel ];
-   }
-}</programlisting>
+<programlisting>
+rxvt-unicode.override {
+  configure = { availablePlugins, ... }: {
+    pluginsDeps = [ xsel ];
+  };
+}
+</programlisting>
 
     <literal>perlDeps</literal> is a handy way to provide Perl packages to
     your custom plugins (in <literal>$HOME/.urxvt/ext</literal>). For example,
     if you need <literal>AnyEvent</literal> you can do:
-    <programlisting>rxvt-unicode.override { configure = { availablePlugins, ... }: {
-     perlDeps = with perlPackages; [ AnyEvent ];
-   }
-}</programlisting>
+<programlisting>
+rxvt-unicode.override {
+  configure = { availablePlugins, ... }: {
+    perlDeps = with perlPackages; [ AnyEvent ];
+  };
+}
+</programlisting>
   </para>
 
  </section>
@@ -90,7 +103,8 @@ map (p: p.name) pkgs.rxvt-unicode.plugins
   <para>
    If the plugin is itself a perl package that needs to be imported from
    other plugins or scripts, add the following passthrough:
-   <programlisting>passthru.perlPackages = [ "self" ];
+<programlisting>
+passthru.perlPackages = [ "self" ];
 </programlisting>
    This will make the urxvt wrapper pick up the dependency and set up the perl
    path accordingly.