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[
+<screen>
-$ docker images
+<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[
+<screen>
-$ docker images
+<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

@@ -38,7 +38,6 @@ buildContainer {
 
   readonly = false; <co xml:id='ex-ociTools-buildContainer-3' />
 }
-
 </programlisting>
    <calloutlist>
     <callout arearefs='ex-ociTools-buildContainer-1'>

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, ... }: {
+<programlisting>
+rxvt-unicode.override {
+  configure = { availablePlugins, ... }: {
     plugins = (builtins.attrValues availablePlugins) ++ [ custom-plugin ];
   };
-}</programlisting>
+}
+</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, ... }: {
+<programlisting>
+rxvt-unicode.override {
+  configure = { availablePlugins, ... }: {
     pluginsDeps = [ xsel ];
+  };
 }
-}</programlisting>
+</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, ... }: {
+<programlisting>
+rxvt-unicode.override {
+  configure = { availablePlugins, ... }: {
     perlDeps = with perlPackages; [ AnyEvent ];
+  };
 }
-}</programlisting>
+</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.

doc/languages-frameworks/ruby.xml

@@ -12,14 +12,14 @@
  </para>
 
 <screen>
-<![CDATA[$ cd pkgs/servers/monitoring
+<prompt>$ </prompt>cd pkgs/servers/monitoring
-$ mkdir sensu
+<prompt>$ </prompt>mkdir sensu
-$ cd sensu
+<prompt>$ </prompt>cd sensu
-$ cat > Gemfile
+<prompt>$ </prompt>cat > Gemfile
 source 'https://rubygems.org'
 gem 'sensu'
-$ $(nix-build '<nixpkgs>' -A bundix --no-out-link)/bin/bundix --magic
+<prompt>$ </prompt>$(nix-build '&lt;nixpkgs>' -A bundix --no-out-link)/bin/bundix --magic
-$ cat > default.nix
+<prompt>$ </prompt>cat > default.nix
 { lib, bundlerEnv, ruby }:
 
 bundlerEnv rec {
@@ -37,7 +37,7 @@ bundlerEnv rec {
     maintainers = with maintainers; [ theuni ];
     platforms   = platforms.unix;
   };
-}]]>
+}
 </screen>
 
  <para>
@@ -49,17 +49,16 @@ bundlerEnv rec {
  </para>
 
 <screen>
-<![CDATA[$ cd pkgs/servers/monitoring/sensu
+<prompt>$ </prompt>cd pkgs/servers/monitoring/sensu
-$ nix-shell -p bundler --run 'bundle lock --update'
+<prompt>$ </prompt>nix-shell -p bundler --run 'bundle lock --update'
-$ nix-shell -p bundix --run 'bundix'
+<prompt>$ </prompt>nix-shell -p bundix --run 'bundix'
-]]>
 </screen>
 
  <para>
   For tools written in Ruby - i.e. where the desire is to install a package and then execute e.g. <command>rake</command> at the command line, there is an alternative builder called <literal>bundlerApp</literal>. Set up the <filename>gemset.nix</filename> the same way, and then, for example:
  </para>
 
-<screen>
+<programlisting>
 <![CDATA[{ lib, bundlerApp }:
 
 bundlerApp {
@@ -75,7 +74,7 @@ bundlerApp {
     platforms   = platforms.unix;
   };
 }]]>
-</screen>
+</programlisting>
 
  <para>
   The chief advantage of <literal>bundlerApp</literal> over <literal>bundlerEnv</literal> is the executables introduced in the environment are precisely those selected in the <literal>exes</literal> list, as opposed to <literal>bundlerEnv</literal> which adds all the executables made available by gems in the gemset, which can mean e.g. <command>rspec</command> or <command>rake</command> in unpredictable versions available from various packages.

doc/languages-frameworks/texlive.xml

@@ -44,11 +44,11 @@ texlive.combine {
    <listitem>
     <para>
      You can list packages e.g. by <command>nix repl</command>.
-<programlisting><![CDATA[
+<programlisting>
-$ nix repl
+<prompt>$ </prompt>nix repl
-nix-repl> :l <nixpkgs>
+<prompt>nix-repl> </prompt>:l &lt;nixpkgs>
-nix-repl> texlive.collection-<TAB>
+<prompt>nix-repl> </prompt>texlive.collection-<keycap function="tab" />
-]]></programlisting>
+</programlisting>
     </para>
    </listitem>
    <listitem>

doc/stdenv/multiple-output.xml

@@ -67,7 +67,7 @@
     <para>
      <command>nix-env</command> silenty disregards the outputs selected by the user, and instead installs the outputs from <varname>meta.outputsToInstall</varname>. For example,
     </para>
-<programlisting>$ nix-env -iA nixpkgs.coreutils.info</programlisting>
+<screen><prompt>$ </prompt>nix-env -iA nixpkgs.coreutils.info</screen>
     <para>
      installs the <literal>"out"</literal> output (<varname>coreutils.meta.outputsToInstall</varname> is <literal>[ "out" ]</literal>) instead of the requested <literal>"info"</literal>.
     </para>

doc/using/configuration.xml

@@ -66,7 +66,7 @@
    <listitem>
     <para>
      For allowing the build of a broken package once, you can use an environment variable for a single invocation of the nix tools:
-<programlisting>$ export NIXPKGS_ALLOW_BROKEN=1</programlisting>
+<screen><prompt>$ </prompt>export NIXPKGS_ALLOW_BROKEN=1</screen>
     </para>
    </listitem>
    <listitem>
@@ -92,7 +92,7 @@
    <listitem>
     <para>
      For allowing the build of an unsupported package once, you can use an environment variable for a single invocation of the nix tools:
-<programlisting>$ export NIXPKGS_ALLOW_UNSUPPORTED_SYSTEM=1</programlisting>
+<screen><prompt>$ </prompt>export NIXPKGS_ALLOW_UNSUPPORTED_SYSTEM=1</screen>
     </para>
    </listitem>
    <listitem>
@@ -122,7 +122,7 @@
    <listitem>
     <para>
      To temporarily allow all unfree packages, you can use an environment variable for a single invocation of the nix tools:
-<programlisting>$ export NIXPKGS_ALLOW_UNFREE=1</programlisting>
+<screen><prompt>$ </prompt>export NIXPKGS_ALLOW_UNFREE=1</screen>
     </para>
    </listitem>
    <listitem>
@@ -187,7 +187,7 @@
    <listitem>
     <para>
      To temporarily allow all insecure packages, you can use an environment variable for a single invocation of the nix tools:
-<programlisting>$ export NIXPKGS_ALLOW_INSECURE=1</programlisting>
+<screen><prompt>$ </prompt>export NIXPKGS_ALLOW_INSECURE=1</screen>
     </para>
    </listitem>
    <listitem>

doc/using/overlays.xml

@@ -248,9 +248,9 @@ self: super:
        <literal>libblas.so.3</literal> and
        <literal>liblapack.so.3</literal>. For instance:
      </para>
-     <programlisting>
+<screen>
-$ LD_LIBRARY_PATH=$(nix-build -A mkl)/lib:$LD_LIBRARY_PATH nix-shell -p octave --run octave
+<prompt>$ </prompt>LD_LIBRARY_PATH=$(nix-build -A mkl)/lib:$LD_LIBRARY_PATH nix-shell -p octave --run octave
-     </programlisting>
+</screen>
      <para>
        Intel MKL requires an <literal>openmp</literal> implementation
        when running with multiple processors. By default,