From ddffa1f247346fa19b2c556edc01ab93ccc648e1 Mon Sep 17 00:00:00 2001
From: Bruno BELANYI <bruno@belanyi.fr>
Date: Fri, 7 May 2021 17:12:48 +0200
Subject: [PATCH] modules: documentation: add linux man pages option

I want to be able to read about syscalls or the C library.
---
 modules/documentation.nix | 28 ++++++++++++++++++----------
 1 file changed, 18 insertions(+), 10 deletions(-)

diff --git a/modules/documentation.nix b/modules/documentation.nix
index 093c4cd..8948778 100644
--- a/modules/documentation.nix
+++ b/modules/documentation.nix
@@ -1,4 +1,4 @@
-{ config, lib, ... }:
+{ config, lib, pkgs, ... }:
 let
   cfg = config.my.module.documentation;
 in
@@ -10,23 +10,31 @@ in
 
     info.enable = mkDisableOption "Documentation aimed at developers";
 
-    man.enable = mkDisableOption "Documentation aimed at developers";
+    man = {
+      enable = mkDisableOption "Documentation aimed at developers";
+
+      linux = mkDisableOption "Linux man pages (section 2 & 3)";
+    };
 
     nixos.enable = mkDisableOption "NixOS documentation";
   };
 
-  config.documentation = {
-    enable = cfg.enable;
+  config = lib.mkIf cfg.enable {
+    documentation = {
+      enable = true;
 
-    dev.enable = cfg.dev.enable;
+      dev.enable = cfg.dev.enable;
 
-    info.enable = cfg.info.enable;
+      info.enable = cfg.info.enable;
 
-    man = {
-      enable = cfg.man.enable;
-      generateCaches = true;
+      man = {
+        enable = cfg.man.enable;
+        generateCaches = true;
+      };
+
+      nixos.enable = cfg.nixos.enable;
     };
 
-    nixos.enable = cfg.nixos.enable;
+    environment.systemPackages = lib.optional cfg.man.linux pkgs.manpages;
   };
 }