chromium: add module

modules/misc/news.nix

@@ -750,6 +750,13 @@ in
           using this option.
         '';
       }
+
+      {
+        time = "2018-08-19T20:46:09+00:00";
+        message = ''
+          A new modules is available: 'programs.chromium'.
+        '';
+      }
     ];
   };
 }

modules/modules.nix

@@ -28,6 +28,7 @@ let
     ./programs/bash.nix
     ./programs/beets.nix
     ./programs/browserpass.nix
+    ./programs/chromium.nix
     ./programs/command-not-found/command-not-found.nix
     ./programs/direnv.nix
     ./programs/eclipse.nix

modules/programs/chromium.nix

@@ -0,0 +1,93 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  browserModule = defaultPkg: name: visible:
+    let
+      browser = (builtins.parseDrvName defaultPkg.name).name;
+    in
+      {
+        enable = mkOption {
+          inherit visible;
+          default = false;
+          example = true;
+          description = "Whether to enable ${name}.";
+          type = lib.types.bool;
+        };
+
+        package = mkOption {
+          inherit visible;
+          type = types.package;
+          default = defaultPkg;
+          defaultText = "pkgs.${browser}";
+          description = "The ${name} package to use.";
+        };
+
+        extensions = mkOption {
+          inherit visible;
+          type = types.listOf types.str;
+          default = [];
+          example = literalExample ''
+            [
+              "chlffgpmiacpedhhbkiomidkjlcfhogd" # pushbullet
+              "mbniclmhobmnbdlbpiphghaielnnpgdp" # lightshot
+              "gcbommkclmclpchllfjekcdonpmejbdp" # https everywhere
+              "cjpalhdlnbpafiamejdnhcphjbkeiagm" # ublock origin
+            ]
+          '';
+          description = ''
+            List of ${name} extensions to install.
+            To find the extension ID, check its URL on the
+            <link xlink:href="https://chrome.google.com/webstore/category/extensions">Chrome Web Store</link>.
+          '';
+        };
+      };
+
+  browserConfig = cfg:
+    let
+
+      browser = (builtins.parseDrvName cfg.package).name;
+
+      darwinDirs = {
+        chromium = "Chromium";
+        google-chrome = "Google/Chrome";
+        google-chrome-beta = "Google/Chrome Beta";
+        google-chrome-dev = "Google/Chrome Dev";
+      };
+
+      configDir = if pkgs.stdenv.isDarwin
+        then "Library/Application Support/${getAttr browser darwinDirs}"
+        else "${config.xdg.configHome}/${browser}";
+
+      extensionJson = ext: {
+        target = "${configDir}/External Extensions/${ext}.json";
+        text = builtins.toJSON {
+          external_update_url = "https://clients2.google.com/service/update2/crx";
+        };
+      };
+
+    in
+      mkIf cfg.enable {
+        home.packages = [ cfg.package ];
+        home.file = map extensionJson cfg.extensions;
+      };
+
+in
+
+{
+  options.programs = {
+    chromium = browserModule pkgs.chromium "Chromium" true;
+    google-chrome = browserModule pkgs.google-chrome "Google Chrome" false;
+    google-chrome-beta = browserModule pkgs.google-chrome-beta "Google Chrome Beta" false;
+    google-chrome-dev = browserModule pkgs.google-chrome-dev "Google Chrome Dev" false;
+  };
+
+  config = mkMerge [
+    (browserConfig config.programs.chromium)
+    (browserConfig config.programs.google-chrome)
+    (browserConfig config.programs.google-chrome-beta)
+    (browserConfig config.programs.google-chrome-dev)
+  ];
+}