vscode: add module

(cherry picked from commit 6ab6488e5a)

modules/misc/news.nix

@@ -895,6 +895,13 @@ in
           A new module is available: 'programs.jq'.
         '';
       }
+
+      {
+        time = "2019-01-07T17:35:19+00:00";
+        message = ''
+          A new module is available: 'programs.vscode'.
+        '';
+      }
     ];
   };
 }

modules/modules.nix

@@ -68,6 +68,7 @@ let
     ./programs/tmux.nix
     ./programs/urxvt.nix
     ./programs/vim.nix
+    ./programs/vscode.nix
     ./programs/zathura.nix
     ./programs/zsh.nix
     ./services/blueman-applet.nix

modules/programs/vscode.nix

@@ -0,0 +1,52 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  cfg = config.programs.vscode;
+
+in
+
+{
+  options = {
+    programs.vscode = {
+      enable = mkEnableOption "Visual Studio Code";
+
+      userSettings = mkOption {
+        type = types.attrs;
+        default = {};
+        example = literalExample ''
+          {
+            "update.channel" = "none";
+            "[nix]"."editor.tabSize" = 2;
+          }
+        '';
+        description = ''
+          Configuration written to
+          <filename>~/.config/Code/User/settings.json</filename>.
+        '';
+      };
+
+      extensions = mkOption {
+        type = types.listOf types.package;
+        default = [];
+        description = ''
+          The extensions Visual Studio Code should be started with.
+          These will override but not delete manually installed ones.
+        '';
+      };
+    };
+  };
+
+  config = mkIf cfg.enable {
+    home.packages = [
+      (pkgs.vscode-with-extensions.override {
+        vscodeExtensions = cfg.extensions;
+      })
+    ];
+
+    xdg.configFile."Code/User/settings.json".text =
+      builtins.toJSON cfg.userSettings;
+  };
+}