Merge branch 'master' into firefox-nix-addon-support

13 files changed, 311 insertions, 375 deletions

diff --git a/doc/builders/packages/emacs.section.md b/doc/builders/packages/emacs.section.md
new file mode 100644
index 00000000000..3829b3575bb
--- /dev/null
+++ b/doc/builders/packages/emacs.section.md
@@ -0,0 +1,119 @@
+# Emacs {#sec-emacs}
+
+## Configuring Emacs
+
+The Emacs package comes with some extra helpers to make it easier to configure. `emacsWithPackages` allows you to manage packages from ELPA. This means that you will not have to install that packages from within Emacs. For instance, if you wanted to use `company` `counsel`, `flycheck`, `ivy`, `magit`, `projectile`, and `use-package` you could use this as a `~/.config/nixpkgs/config.nix` override:
+
+```nix
+{
+  packageOverrides = pkgs: with pkgs; {
+    myEmacs = emacsWithPackages (epkgs: (with epkgs.melpaStablePackages; [
+      company
+      counsel
+      flycheck
+      ivy
+      magit
+      projectile
+      use-package
+    ]));
+  }
+}
+```
+
+You can install it like any other packages via `nix-env -iA myEmacs`. However, this will only install those packages. It will not `configure` them for us. To do this, we need to provide a configuration file. Luckily, it is possible to do this from within Nix! By modifying the above example, we can make Emacs load a custom config file. The key is to create a package that provide a `default.el` file in `/share/emacs/site-start/`. Emacs knows to load this file automatically when it starts.
+
+```nix
+{
+  packageOverrides = pkgs: with pkgs; rec {
+    myEmacsConfig = writeText "default.el" ''
+      ;; initialize package
+
+      (require 'package)
+      (package-initialize 'noactivate)
+      (eval-when-compile
+        (require 'use-package))
+
+      ;; load some packages
+
+      (use-package company
+        :bind ("<C-tab>" . company-complete)
+        :diminish company-mode
+        :commands (company-mode global-company-mode)
+        :defer 1
+        :config
+        (global-company-mode))
+
+      (use-package counsel
+        :commands (counsel-descbinds)
+        :bind (([remap execute-extended-command] . counsel-M-x)
+               ("C-x C-f" . counsel-find-file)
+               ("C-c g" . counsel-git)
+               ("C-c j" . counsel-git-grep)
+               ("C-c k" . counsel-ag)
+               ("C-x l" . counsel-locate)
+               ("M-y" . counsel-yank-pop)))
+
+      (use-package flycheck
+        :defer 2
+        :config (global-flycheck-mode))
+
+      (use-package ivy
+        :defer 1
+        :bind (("C-c C-r" . ivy-resume)
+               ("C-x C-b" . ivy-switch-buffer)
+               :map ivy-minibuffer-map
+               ("C-j" . ivy-call))
+        :diminish ivy-mode
+        :commands ivy-mode
+        :config
+        (ivy-mode 1))
+
+      (use-package magit
+        :defer
+        :if (executable-find "git")
+        :bind (("C-x g" . magit-status)
+               ("C-x G" . magit-dispatch-popup))
+        :init
+        (setq magit-completing-read-function 'ivy-completing-read))
+
+      (use-package projectile
+        :commands projectile-mode
+        :bind-keymap ("C-c p" . projectile-command-map)
+        :defer 5
+        :config
+        (projectile-global-mode))
+    '';
+
+    myEmacs = emacsWithPackages (epkgs: (with epkgs.melpaStablePackages; [
+      (runCommand "default.el" {} ''
+         mkdir -p $out/share/emacs/site-lisp
+         cp ${myEmacsConfig} $out/share/emacs/site-lisp/default.el
+       '')
+      company
+      counsel
+      flycheck
+      ivy
+      magit
+      projectile
+      use-package
+    ]));
+  };
+}
+```
+
+This provides a fairly full Emacs start file. It will load in addition to the user's presonal config. You can always disable it by passing `-q` to the Emacs command.
+
+Sometimes `emacsWithPackages` is not enough, as this package set has some priorities imposed on packages (with the lowest priority assigned to Melpa Unstable, and the highest for packages manually defined in `pkgs/top-level/emacs-packages.nix`). But you can't control this priorities when some package is installed as a dependency. You can override it on per-package-basis, providing all the required dependencies manually - but it's tedious and there is always a possibility that an unwanted dependency will sneak in through some other package. To completely override such a package you can use `overrideScope'`.
+
+```nix
+overrides = self: super: rec {
+  haskell-mode = self.melpaPackages.haskell-mode;
+  ...
+};
+((emacsPackagesGen emacs).overrideScope' overrides).emacsWithPackages
+  (p: with p; [
+    # here both these package will use haskell-mode of our own choice
+    ghc-mod
+    dante
+  ])
+```
diff --git a/doc/builders/packages/emacs.xml b/doc/builders/packages/emacs.xml
deleted file mode 100644
index 9cce7c40863..00000000000
--- a/doc/builders/packages/emacs.xml
+++ /dev/null
@@ -1,131 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="sec-emacs">
- <title>Emacs</title>
-
- <section xml:id="sec-emacs-config">
-  <title>Configuring Emacs</title>
-
-  <para>
-   The Emacs package comes with some extra helpers to make it easier to configure. <varname>emacsWithPackages</varname> allows you to manage packages from ELPA. This means that you will not have to install that packages from within Emacs. For instance, if you wanted to use <literal>company</literal>, <literal>counsel</literal>, <literal>flycheck</literal>, <literal>ivy</literal>, <literal>magit</literal>, <literal>projectile</literal>, and <literal>use-package</literal> you could use this as a <filename>~/.config/nixpkgs/config.nix</filename> override:
-  </para>
-
-<screen>
-{
-  packageOverrides = pkgs: with pkgs; {
-    myEmacs = emacsWithPackages (epkgs: (with epkgs.melpaStablePackages; [
-      company
-      counsel
-      flycheck
-      ivy
-      magit
-      projectile
-      use-package
-    ]));
-  }
-}
-</screen>
-
-  <para>
-   You can install it like any other packages via <command>nix-env -iA myEmacs</command>. However, this will only install those packages. It will not <literal>configure</literal> them for us. To do this, we need to provide a configuration file. Luckily, it is possible to do this from within Nix! By modifying the above example, we can make Emacs load a custom config file. The key is to create a package that provide a <filename>default.el</filename> file in <filename>/share/emacs/site-start/</filename>. Emacs knows to load this file automatically when it starts.
-  </para>
-
-<screen>
-{
-  packageOverrides = pkgs: with pkgs; rec {
-    myEmacsConfig = writeText "default.el" ''
-;; initialize package
-
-(require 'package)
-(package-initialize 'noactivate)
-(eval-when-compile
-  (require 'use-package))
-
-;; load some packages
-
-(use-package company
-  :bind ("&lt;C-tab&gt;" . company-complete)
-  :diminish company-mode
-  :commands (company-mode global-company-mode)
-  :defer 1
-  :config
-  (global-company-mode))
-
-(use-package counsel
-  :commands (counsel-descbinds)
-  :bind (([remap execute-extended-command] . counsel-M-x)
-         ("C-x C-f" . counsel-find-file)
-         ("C-c g" . counsel-git)
-         ("C-c j" . counsel-git-grep)
-         ("C-c k" . counsel-ag)
-         ("C-x l" . counsel-locate)
-         ("M-y" . counsel-yank-pop)))
-
-(use-package flycheck
-  :defer 2
-  :config (global-flycheck-mode))
-
-(use-package ivy
-  :defer 1
-  :bind (("C-c C-r" . ivy-resume)
-         ("C-x C-b" . ivy-switch-buffer)
-         :map ivy-minibuffer-map
-         ("C-j" . ivy-call))
-  :diminish ivy-mode
-  :commands ivy-mode
-  :config
-  (ivy-mode 1))
-
-(use-package magit
-  :defer
-  :if (executable-find "git")
-  :bind (("C-x g" . magit-status)
-         ("C-x G" . magit-dispatch-popup))
-  :init
-  (setq magit-completing-read-function 'ivy-completing-read))
-
-(use-package projectile
-  :commands projectile-mode
-  :bind-keymap ("C-c p" . projectile-command-map)
-  :defer 5
-  :config
-  (projectile-global-mode))
-    '';
-    myEmacs = emacsWithPackages (epkgs: (with epkgs.melpaStablePackages; [
-      (runCommand "default.el" {} ''
-mkdir -p $out/share/emacs/site-lisp
-cp ${myEmacsConfig} $out/share/emacs/site-lisp/default.el
-'')
-      company
-      counsel
-      flycheck
-      ivy
-      magit
-      projectile
-      use-package
-    ]));
-  };
-}
-</screen>
-
-  <para>
-   This provides a fairly full Emacs start file. It will load in addition to the user's presonal config. You can always disable it by passing <command>-q</command> to the Emacs command.
-  </para>
-
-  <para>
-   Sometimes <varname>emacsWithPackages</varname> is not enough, as this package set has some priorities imposed on packages (with the lowest priority assigned to Melpa Unstable, and the highest for packages manually defined in <filename>pkgs/top-level/emacs-packages.nix</filename>). But you can't control this priorities when some package is installed as a dependency. You can override it on per-package-basis, providing all the required dependencies manually - but it's tedious and there is always a possibility that an unwanted dependency will sneak in through some other package. To completely override such a package you can use <varname>overrideScope'</varname>.
-  </para>
-
-<screen>
-overrides = self: super: rec {
-  haskell-mode = self.melpaPackages.haskell-mode;
-  ...
-};
-((emacsPackagesGen emacs).overrideScope' overrides).emacsWithPackages (p: with p; [
-  # here both these package will use haskell-mode of our own choice
-  ghc-mod
-  dante
-])
-</screen>
- </section>
-</section>
diff --git a/doc/builders/packages/index.xml b/doc/builders/packages/index.xml
index 6d7537bb36d..c2e7ef9bf61 100644
--- a/doc/builders/packages/index.xml
+++ b/doc/builders/packages/index.xml
@@ -9,18 +9,18 @@
  <xi:include href="dlib.xml" />
  <xi:include href="eclipse.xml" />
  <xi:include href="elm.xml" />
- <xi:include href="emacs.xml" />
+ <xi:include href="emacs.section.xml" />
  <xi:include href="firefox.section.xml" />
  <xi:include href="ibus.xml" />
  <xi:include href="kakoune.section.xml" />
- <xi:include href="linux.xml" />
+ <xi:include href="linux.section.xml" />
  <xi:include href="locales.xml" />
- <xi:include href="nginx.xml" />
- <xi:include href="opengl.xml" />
+ <xi:include href="nginx.section.xml" />
+ <xi:include href="opengl.section.xml" />
  <xi:include href="shell-helpers.xml" />
  <xi:include href="steam.xml" />
  <xi:include href="cataclysm-dda.section.xml" />
  <xi:include href="urxvt.xml" />
- <xi:include href="weechat.xml" />
- <xi:include href="xorg.xml" />
+ <xi:include href="weechat.section.xml" />
+ <xi:include href="xorg.section.xml" />
 </chapter>
diff --git a/doc/builders/packages/linux.section.md b/doc/builders/packages/linux.section.md
new file mode 100644
index 00000000000..1b8d6eda749
--- /dev/null
+++ b/doc/builders/packages/linux.section.md
@@ -0,0 +1,41 @@
+# Linux kernel {#sec-linux-kernel}
+
+The Nix expressions to build the Linux kernel are in [`pkgs/os-specific/linux/kernel`](https://github.com/NixOS/nixpkgs/blob/master/pkgs/os-specific/linux/kernel).
+
+The function that builds the kernel has an argument `kernelPatches` which should be a list of `{name, patch, extraConfig}` attribute sets, where `name` is the name of the patch (which is included in the kernel’s `meta.description` attribute), `patch` is the patch itself (possibly compressed), and `extraConfig` (optional) is a string specifying extra options to be concatenated to the kernel configuration file (`.config`).
+
+The kernel derivation exports an attribute `features` specifying whether optional functionality is or isn’t enabled. This is used in NixOS to implement kernel-specific behaviour. For instance, if the kernel has the `iwlwifi` feature (i.e. has built-in support for Intel wireless chipsets), then NixOS doesn’t have to build the external `iwlwifi` package:
+
+```nix
+modulesTree = [kernel]
+  ++ pkgs.lib.optional (!kernel.features ? iwlwifi) kernelPackages.iwlwifi
+  ++ ...;
+```
+
+How to add a new (major) version of the Linux kernel to Nixpkgs:
+
+1.  Copy the old Nix expression (e.g. `linux-2.6.21.nix`) to the new one (e.g. `linux-2.6.22.nix`) and update it.
+
+2.  Add the new kernel to `all-packages.nix` (e.g., create an attribute `kernel_2_6_22`).
+
+3.  Now we’re going to update the kernel configuration. First unpack the kernel. Then for each supported platform (`i686`, `x86_64`, `uml`) do the following:
+
+    1.  Make an copy from the old config (e.g. `config-2.6.21-i686-smp`) to the new one (e.g. `config-2.6.22-i686-smp`).
+
+    2.  Copy the config file for this platform (e.g. `config-2.6.22-i686-smp`) to `.config` in the kernel source tree.
+
+    3.  Run `make oldconfig ARCH={i386,x86_64,um}` and answer all questions. (For the uml configuration, also add `SHELL=bash`.) Make sure to keep the configuration consistent between platforms (i.e. don’t enable some feature on `i686` and disable it on `x86_64`).
+
+    4.  If needed you can also run `make menuconfig`:
+
+        ```ShellSession
+        $ nix-env -i ncurses
+        $ export NIX_CFLAGS_LINK=-lncurses
+        $ make menuconfig ARCH=arch
+        ```
+
+    5.  Copy `.config` over the new config file (e.g. `config-2.6.22-i686-smp`).
+
+4.  Test building the kernel: `nix-build -A kernel_2_6_22`. If it compiles, ship it! For extra credit, try booting NixOS with it.
+
+5.  It may be that the new kernel requires updating the external kernel modules and kernel-dependent packages listed in the `linuxPackagesFor` function in `all-packages.nix` (such as the NVIDIA drivers, AUFS, etc.). If the updated packages aren’t backwards compatible with older kernels, you may need to keep the older versions around.
diff --git a/doc/builders/packages/linux.xml b/doc/builders/packages/linux.xml
deleted file mode 100644
index 72d0e21493b..00000000000
--- a/doc/builders/packages/linux.xml
+++ /dev/null
@@ -1,85 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="sec-linux-kernel">
- <title>Linux kernel</title>
-
- <para>
-  The Nix expressions to build the Linux kernel are in <link
-xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/os-specific/linux/kernel"><filename>pkgs/os-specific/linux/kernel</filename></link>.
- </para>
-
- <para>
-  The function that builds the kernel has an argument <varname>kernelPatches</varname> which should be a list of <literal>{name, patch, extraConfig}</literal> attribute sets, where <varname>name</varname> is the name of the patch (which is included in the kernel’s <varname>meta.description</varname> attribute), <varname>patch</varname> is the patch itself (possibly compressed), and <varname>extraConfig</varname> (optional) is a string specifying extra options to be concatenated to the kernel configuration file (<filename>.config</filename>).
- </para>
-
- <para>
-  The kernel derivation exports an attribute <varname>features</varname> specifying whether optional functionality is or isn’t enabled. This is used in NixOS to implement kernel-specific behaviour. For instance, if the kernel has the <varname>iwlwifi</varname> feature (i.e. has built-in support for Intel wireless chipsets), then NixOS doesn’t have to build the external <varname>iwlwifi</varname> package:
-<programlisting>
-modulesTree = [kernel]
-  ++ pkgs.lib.optional (!kernel.features ? iwlwifi) kernelPackages.iwlwifi
-  ++ ...;
-</programlisting>
- </para>
-
- <para>
-  How to add a new (major) version of the Linux kernel to Nixpkgs:
-  <orderedlist>
-   <listitem>
-    <para>
-     Copy the old Nix expression (e.g. <filename>linux-2.6.21.nix</filename>) to the new one (e.g. <filename>linux-2.6.22.nix</filename>) and update it.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Add the new kernel to <filename>all-packages.nix</filename> (e.g., create an attribute <varname>kernel_2_6_22</varname>).
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Now we’re going to update the kernel configuration. First unpack the kernel. Then for each supported platform (<literal>i686</literal>, <literal>x86_64</literal>, <literal>uml</literal>) do the following:
-     <orderedlist>
-      <listitem>
-       <para>
-        Make an copy from the old config (e.g. <filename>config-2.6.21-i686-smp</filename>) to the new one (e.g. <filename>config-2.6.22-i686-smp</filename>).
-       </para>
-      </listitem>
-      <listitem>
-       <para>
-        Copy the config file for this platform (e.g. <filename>config-2.6.22-i686-smp</filename>) to <filename>.config</filename> in the kernel source tree.
-       </para>
-      </listitem>
-      <listitem>
-       <para>
-        Run <literal>make oldconfig ARCH=<replaceable>{i386,x86_64,um}</replaceable></literal> and answer all questions. (For the uml configuration, also add <literal>SHELL=bash</literal>.) Make sure to keep the configuration consistent between platforms (i.e. don’t enable some feature on <literal>i686</literal> and disable it on <literal>x86_64</literal>).
-       </para>
-      </listitem>
-      <listitem>
-       <para>
-        If needed you can also run <literal>make menuconfig</literal>:
-<screen>
-<prompt>$ </prompt>nix-env -i ncurses
-<prompt>$ </prompt>export NIX_CFLAGS_LINK=-lncurses
-<prompt>$ </prompt>make menuconfig ARCH=<replaceable>arch</replaceable></screen>
-       </para>
-      </listitem>
-      <listitem>
-       <para>
-        Copy <filename>.config</filename> over the new config file (e.g. <filename>config-2.6.22-i686-smp</filename>).
-       </para>
-      </listitem>
-     </orderedlist>
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Test building the kernel: <literal>nix-build -A kernel_2_6_22</literal>. If it compiles, ship it! For extra credit, try booting NixOS with it.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     It may be that the new kernel requires updating the external kernel modules and kernel-dependent packages listed in the <varname>linuxPackagesFor</varname> function in <filename>all-packages.nix</filename> (such as the NVIDIA drivers, AUFS, etc.). If the updated packages aren’t backwards compatible with older kernels, you may need to keep the older versions around.
-    </para>
-   </listitem>
-  </orderedlist>
- </para>
-</section>
diff --git a/doc/builders/packages/nginx.section.md b/doc/builders/packages/nginx.section.md
new file mode 100644
index 00000000000..154c21f9b36
--- /dev/null
+++ b/doc/builders/packages/nginx.section.md
@@ -0,0 +1,11 @@
+# Nginx {#sec-nginx}
+
+[Nginx](https://nginx.org) is a reverse proxy and lightweight webserver.
+
+## ETags on static files served from the Nix store {#sec-nginx-etag}
+
+HTTP has a couple different mechanisms for caching to prevent clients from having to download the same content repeatedly if a resource has not changed since the last time it was requested. When nginx is used as a server for static files, it implements the caching mechanism based on the [`Last-Modified`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Last-Modified) response header automatically; unfortunately, it works by using filesystem timestamps to determine the value of the `Last-Modified` header. This doesn't give the desired behavior when the file is in the Nix store, because all file timestamps are set to 0 (for reasons related to build reproducibility).
+
+Fortunately, HTTP supports an alternative (and more effective) caching mechanism: the [`ETag`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/ETag) response header. The value of the `ETag` header specifies some identifier for the particular content that the server is sending (e.g. a hash). When a client makes a second request for the same resource, it sends that value back in an `If-None-Match` header. If the ETag value is unchanged, then the server does not need to resend the content.
+
+As of NixOS 19.09, the nginx package in Nixpkgs is patched such that when nginx serves a file out of `/nix/store`, the hash in the store path is used as the `ETag` header in the HTTP response, thus providing proper caching functionality. This happens automatically; you do not need to do modify any configuration to get this behavior.
diff --git a/doc/builders/packages/nginx.xml b/doc/builders/packages/nginx.xml
deleted file mode 100644
index 65854ba0236..00000000000
--- a/doc/builders/packages/nginx.xml
+++ /dev/null
@@ -1,25 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="sec-nginx">
- <title>Nginx</title>
-
- <para>
-  <link xlink:href="https://nginx.org/">Nginx</link> is a reverse proxy and lightweight webserver.
- </para>
-
- <section xml:id="sec-nginx-etag">
-  <title>ETags on static files served from the Nix store</title>
-
-  <para>
-   HTTP has a couple different mechanisms for caching to prevent clients from having to download the same content repeatedly if a resource has not changed since the last time it was requested. When nginx is used as a server for static files, it implements the caching mechanism based on the <link xlink:href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Last-Modified"><literal>Last-Modified</literal></link> response header automatically; unfortunately, it works by using filesystem timestamps to determine the value of the <literal>Last-Modified</literal> header. This doesn't give the desired behavior when the file is in the Nix store, because all file timestamps are set to 0 (for reasons related to build reproducibility).
-  </para>
-
-  <para>
-   Fortunately, HTTP supports an alternative (and more effective) caching mechanism: the <link xlink:href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/ETag"><literal>ETag</literal></link> response header. The value of the <literal>ETag</literal> header specifies some identifier for the particular content that the server is sending (e.g. a hash). When a client makes a second request for the same resource, it sends that value back in an <literal>If-None-Match</literal> header. If the ETag value is unchanged, then the server does not need to resend the content.
-  </para>
-
-  <para>
-   As of NixOS 19.09, the nginx package in Nixpkgs is patched such that when nginx serves a file out of <filename>/nix/store</filename>, the hash in the store path is used as the <literal>ETag</literal> header in the HTTP response, thus providing proper caching functionality. This happens automatically; you do not need to do modify any configuration to get this behavior.
-  </para>
- </section>
-</section>
diff --git a/doc/builders/packages/opengl.section.md b/doc/builders/packages/opengl.section.md
new file mode 100644
index 00000000000..6866bf89221
--- /dev/null
+++ b/doc/builders/packages/opengl.section.md
@@ -0,0 +1,15 @@
+# OpenGL {#sec-opengl}
+
+OpenGL support varies depending on which hardware is used and which drivers are available and loaded.
+
+Broadly, we support both GL vendors: Mesa and NVIDIA.
+
+## NixOS Desktop
+
+The NixOS desktop or other non-headless configurations are the primary target for OpenGL libraries and applications. The current solution for discovering which drivers are available is based on [libglvnd](https://gitlab.freedesktop.org/glvnd/libglvnd). `libglvnd` performs "vendor-neutral dispatch", trying a variety of techniques to find the system's GL implementation. In practice, this will be either via standard GLX for X11 users or EGL for Wayland users, and supporting either NVIDIA or Mesa extensions.
+
+## Nix on GNU/Linux
+
+If you are using a non-NixOS GNU/Linux/X11 desktop with free software video drivers, consider launching OpenGL-dependent programs from Nixpkgs with Nixpkgs versions of `libglvnd` and `mesa.drivers` in `LD_LIBRARY_PATH`. For Mesa drivers, the Linux kernel version doesn't have to match nixpkgs.
+
+For proprietary video drivers you might have luck with also adding the corresponding video driver package.
diff --git a/doc/builders/packages/opengl.xml b/doc/builders/packages/opengl.xml
deleted file mode 100644
index dfd64b18858..00000000000
--- a/doc/builders/packages/opengl.xml
+++ /dev/null
@@ -1,9 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="sec-opengl">
- <title>OpenGL</title>
-
- <para>
-  Packages that use OpenGL have NixOS desktop as their primary target. The current solution for loading the GPU-specific drivers is based on <literal>libglvnd</literal> and looks for the driver implementation in <literal>LD_LIBRARY_PATH</literal>. If you are using a non-NixOS GNU/Linux/X11 desktop with free software video drivers, consider launching OpenGL-dependent programs from Nixpkgs with Nixpkgs versions of <literal>libglvnd</literal> and <literal>mesa.drivers</literal> in <literal>LD_LIBRARY_PATH</literal>. For proprietary video drivers you might have luck with also adding the corresponding video driver package.
- </para>
-</section>
diff --git a/doc/builders/packages/weechat.section.md b/doc/builders/packages/weechat.section.md
new file mode 100644
index 00000000000..1d99b00e632
--- /dev/null
+++ b/doc/builders/packages/weechat.section.md
@@ -0,0 +1,85 @@
+# Weechat {#sec-weechat}
+
+Weechat can be configured to include your choice of plugins, reducing its closure size from the default configuration which includes all available plugins. To make use of this functionality, install an expression that overrides its configuration such as
+
+```nix
+weechat.override {configure = {availablePlugins, ...}: {
+    plugins = with availablePlugins; [ python perl ];
+  }
+}
+```
+
+If the `configure` function returns an attrset without the `plugins` attribute, `availablePlugins` will be used automatically.
+
+The plugins currently available are `python`, `perl`, `ruby`, `guile`, `tcl` and `lua`.
+
+The python and perl plugins allows the addition of extra libraries. For instance, the `inotify.py` script in `weechat-scripts` requires D-Bus or libnotify, and the `fish.py` script requires `pycrypto`. To use these scripts, use the plugin's `withPackages` attribute:
+
+```nix
+weechat.override { configure = {availablePlugins, ...}: {
+    plugins = with availablePlugins; [
+            (python.withPackages (ps: with ps; [ pycrypto python-dbus ]))
+        ];
+    };
+}
+```
+
+In order to also keep all default plugins installed, it is possible to use the following method:
+
+```nix
+weechat.override { configure = { availablePlugins, ... }: {
+  plugins = builtins.attrValues (availablePlugins // {
+    python = availablePlugins.python.withPackages (ps: with ps; [ pycrypto python-dbus ]);
+  });
+}; }
+```
+
+WeeChat allows to set defaults on startup using the `--run-command`. The `configure` method can be used to pass commands to the program:
+
+```nix
+weechat.override {
+  configure = { availablePlugins, ... }: {
+    init = ''
+      /set foo bar
+      /server add freenode chat.freenode.org
+    '';
+  };
+}
+```
+
+Further values can be added to the list of commands when running `weechat --run-command "your-commands"`.
+
+Additionally it's possible to specify scripts to be loaded when starting `weechat`. These will be loaded before the commands from `init`:
+
+```nix
+weechat.override {
+  configure = { availablePlugins, ... }: {
+    scripts = with pkgs.weechatScripts; [
+      weechat-xmpp weechat-matrix-bridge wee-slack
+    ];
+    init = ''
+      /set plugins.var.python.jabber.key "val"
+    '':
+  };
+}
+```
+
+In `nixpkgs` there's a subpackage which contains derivations for WeeChat scripts. Such derivations expect a `passthru.scripts` attribute which contains a list of all scripts inside the store path. Furthermore all scripts have to live in `$out/share`. An exemplary derivation looks like this:
+
+```nix
+{ stdenv, fetchurl }:
+
+stdenv.mkDerivation {
+  name = "exemplary-weechat-script";
+  src = fetchurl {
+    url = "https://scripts.tld/your-scripts.tar.gz";
+    sha256 = "...";
+  };
+  passthru.scripts = [ "foo.py" "bar.lua" ];
+  installPhase = ''
+    mkdir $out/share
+    cp foo.py $out/share
+    cp bar.lua $out/share
+  '';
+}
+```
diff --git a/doc/builders/packages/weechat.xml b/doc/builders/packages/weechat.xml
deleted file mode 100644
index a110d3f491c..00000000000
--- a/doc/builders/packages/weechat.xml
+++ /dev/null
@@ -1,85 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="sec-weechat">
- <title>Weechat</title>
-
- <para>
-  Weechat can be configured to include your choice of plugins, reducing its closure size from the default configuration which includes all available plugins. To make use of this functionality, install an expression that overrides its configuration such as
-<programlisting>weechat.override {configure = {availablePlugins, ...}: {
-    plugins = with availablePlugins; [ python perl ];
-  }
-}</programlisting>
-  If the <literal>configure</literal> function returns an attrset without the <literal>plugins</literal> attribute, <literal>availablePlugins</literal> will be used automatically.
- </para>
-
- <para>
-  The plugins currently available are <literal>python</literal>, <literal>perl</literal>, <literal>ruby</literal>, <literal>guile</literal>, <literal>tcl</literal> and <literal>lua</literal>.
- </para>
-
- <para>
-  The python and perl plugins allows the addition of extra libraries. For instance, the <literal>inotify.py</literal> script in weechat-scripts requires D-Bus or libnotify, and the <literal>fish.py</literal> script requires pycrypto. To use these scripts, use the plugin's <literal>withPackages</literal> attribute:
-<programlisting>weechat.override { configure = {availablePlugins, ...}: {
-    plugins = with availablePlugins; [
-            (python.withPackages (ps: with ps; [ pycrypto python-dbus ]))
-        ];
-    };
-}
-</programlisting>
- </para>
-
- <para>
-  In order to also keep all default plugins installed, it is possible to use the following method:
-<programlisting>weechat.override { configure = { availablePlugins, ... }: {
-  plugins = builtins.attrValues (availablePlugins // {
-    python = availablePlugins.python.withPackages (ps: with ps; [ pycrypto python-dbus ]);
-  });
-}; }
-</programlisting>
- </para>
-
- <para>
-  WeeChat allows to set defaults on startup using the <literal>--run-command</literal>. The <literal>configure</literal> method can be used to pass commands to the program:
-<programlisting>weechat.override {
-  configure = { availablePlugins, ... }: {
-    init = ''
-      /set foo bar
-      /server add freenode chat.freenode.org
-    '';
-  };
-}</programlisting>
-  Further values can be added to the list of commands when running <literal>weechat --run-command "your-commands"</literal>.
- </para>
-
- <para>
-  Additionally it's possible to specify scripts to be loaded when starting <literal>weechat</literal>. These will be loaded before the commands from <literal>init</literal>:
-<programlisting>weechat.override {
-  configure = { availablePlugins, ... }: {
-    scripts = with pkgs.weechatScripts; [
-      weechat-xmpp weechat-matrix-bridge wee-slack
-    ];
-    init = ''
-      /set plugins.var.python.jabber.key "val"
-    '':
-  };
-}</programlisting>
- </para>
-
- <para>
-  In <literal>nixpkgs</literal> there's a subpackage which contains derivations for WeeChat scripts. Such derivations expect a <literal>passthru.scripts</literal> attribute which contains a list of all scripts inside the store path. Furthermore all scripts have to live in <literal>$out/share</literal>. An exemplary derivation looks like this:
-<programlisting>{ stdenv, fetchurl }:
-
-stdenv.mkDerivation {
-  name = "exemplary-weechat-script";
-  src = fetchurl {
-    url = "https://scripts.tld/your-scripts.tar.gz";
-    sha256 = "...";
-  };
-  passthru.scripts = [ "foo.py" "bar.lua" ];
-  installPhase = ''
-    mkdir $out/share
-    cp foo.py $out/share
-    cp bar.lua $out/share
-  '';
-}</programlisting>
- </para>
-</section>
diff --git a/doc/builders/packages/xorg.section.md b/doc/builders/packages/xorg.section.md
new file mode 100644
index 00000000000..be220a25404
--- /dev/null
+++ b/doc/builders/packages/xorg.section.md
@@ -0,0 +1,34 @@
+# X.org {#sec-xorg}
+
+The Nix expressions for the X.org packages reside in `pkgs/servers/x11/xorg/default.nix`. This file is automatically generated from lists of tarballs in an X.org release. As such it should not be modified directly; rather, you should modify the lists, the generator script or the file `pkgs/servers/x11/xorg/overrides.nix`, in which you can override or add to the derivations produced by the generator.
+
+## Katamari Tarballs
+
+X.org upstream releases used to include [katamari](https://en.wiktionary.org/wiki/%E3%81%8B%E3%81%9F%E3%81%BE%E3%82%8A) releases, which included a holistic recommended version for each tarball, up until 7.7. To create a list of tarballs in a katamari release:
+
+```ShellSession
+export release="X11R7.7"
+export url="mirror://xorg/$release/src/everything/"
+cat $(PRINT_PATH=1 nix-prefetch-url $url | tail -n 1) \
+  | perl -e 'while (<>) { if (/(href|HREF)="([^"]*.bz2)"/) { print "$ENV{'url'}$2\n"; }; }' \
+  | sort > "tarballs-$release.list"
+```
+
+## Individual Tarballs
+
+The upstream release process for [X11R7.8](https://x.org/wiki/Releases/7.8/) does not include a planned katamari. Instead, each component of X.org is released as its own tarball. We maintain `pkgs/servers/x11/xorg/tarballs.list` as a list of tarballs for each individual package. This list includes X.org core libraries and protocol descriptions, extra newer X11 interface libraries, like `xorg.libxcb`, and classic utilities which are largely unused but still available if needed, like `xorg.imake`.
+
+## Generating Nix Expressions
+
+The generator is invoked as follows:
+
+```ShellSession
+cd pkgs/servers/x11/xorg
+<tarballs.list perl ./generate-expr-from-tarballs.pl
+```
+
+For each of the tarballs in the `.list` files, the script downloads it, unpacks it, and searches its `configure.ac` and `*.pc.in` files for dependencies. This information is used to generate `default.nix`. The generator caches downloaded tarballs between runs. Pay close attention to the `NOT FOUND: $NAME` messages at the end of the run, since they may indicate missing dependencies. (Some might be optional dependencies, however.)
+
+## Overriding the Generator
+
+If the expression for a package requires derivation attributes that the generator cannot figure out automatically (say, `patches` or a `postInstall` hook), you should modify `pkgs/servers/x11/xorg/overrides.nix`.
diff --git a/doc/builders/packages/xorg.xml b/doc/builders/packages/xorg.xml
deleted file mode 100644
index ebf4930cc09..00000000000
--- a/doc/builders/packages/xorg.xml
+++ /dev/null
@@ -1,34 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="sec-xorg">
- <title>X.org</title>
-
- <para>
-  The Nix expressions for the X.org packages reside in <filename>pkgs/servers/x11/xorg/default.nix</filename>. This file is automatically generated from lists of tarballs in an X.org release. As such it should not be modified directly; rather, you should modify the lists, the generator script or the file <filename>pkgs/servers/x11/xorg/overrides.nix</filename>, in which you can override or add to the derivations produced by the generator.
- </para>
-
- <para>
-  The generator is invoked as follows:
-<screen>
-<prompt>$ </prompt>cd pkgs/servers/x11/xorg
-<prompt>$ </prompt>cat tarballs-7.5.list extra.list old.list \
-  | perl ./generate-expr-from-tarballs.pl
-</screen>
-  For each of the tarballs in the <filename>.list</filename> files, the script downloads it, unpacks it, and searches its <filename>configure.ac</filename> and <filename>*.pc.in</filename> files for dependencies. This information is used to generate <filename>default.nix</filename>. The generator caches downloaded tarballs between runs. Pay close attention to the <literal>NOT FOUND: <replaceable>name</replaceable></literal> messages at the end of the run, since they may indicate missing dependencies. (Some might be optional dependencies, however.)
- </para>
-
- <para>
-  A file like <filename>tarballs-7.5.list</filename> contains all tarballs in a X.org release. It can be generated like this:
-<screen>
-<prompt>$ </prompt>export i="mirror://xorg/X11R7.4/src/everything/"
-<prompt>$ </prompt>cat $(PRINT_PATH=1 nix-prefetch-url $i | tail -n 1) \
-  | perl -e 'while (&lt;>) { if (/(href|HREF)="([^"]*.bz2)"/) { print "$ENV{'i'}$2\n"; }; }' \
-  | sort > tarballs-7.4.list
-</screen>
-  <filename>extra.list</filename> contains libraries that aren’t part of X.org proper, but are closely related to it, such as <literal>libxcb</literal>. <filename>old.list</filename> contains some packages that were removed from X.org, but are still needed by some people or by other packages (such as <varname>imake</varname>).
- </para>
-
- <para>
-  If the expression for a package requires derivation attributes that the generator cannot figure out automatically (say, <varname>patches</varname> or a <varname>postInstall</varname> hook), you should modify <filename>pkgs/servers/x11/xorg/overrides.nix</filename>.
- </para>
-</section>