From e11f110b4bf7352cf6a0b3711d34312bf6e2e784 Mon Sep 17 00:00:00 2001
From: Roman Volosatovs <rvolosatovs@riseup.net>
Date: Sat, 18 Aug 2018 16:13:33 +0200
Subject: [PATCH] go: add module

(cherry picked from commit 0635423e7365e9dbccac2fa154f53a45e952898e)
---
 modules/misc/news.nix   |  7 ++++
 modules/modules.nix     |  1 +
 modules/programs/go.nix | 74 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 82 insertions(+)
 create mode 100644 modules/programs/go.nix

diff --git a/modules/misc/news.nix b/modules/misc/news.nix
index b8d4f86b3..9b3db5a4d 100644
--- a/modules/misc/news.nix
+++ b/modules/misc/news.nix
@@ -793,6 +793,13 @@ in
           A new module is available: 'programs.zathura'.
         '';
       }
+
+      {
+        time = "2018-09-20T22:10:45+00:00";
+        message = ''
+          A new module is available: 'programs.go'.
+        '';
+      }
     ];
   };
 }
diff --git a/modules/modules.nix b/modules/modules.nix
index a7f05eed4..703b22773 100644
--- a/modules/modules.nix
+++ b/modules/modules.nix
@@ -38,6 +38,7 @@ let
     ./programs/fzf.nix
     ./programs/git.nix
     ./programs/gnome-terminal.nix
+    ./programs/go.nix
     ./programs/home-manager.nix
     ./programs/htop.nix
     ./programs/info.nix
diff --git a/modules/programs/go.nix b/modules/programs/go.nix
new file mode 100644
index 000000000..d1817ae26
--- /dev/null
+++ b/modules/programs/go.nix
@@ -0,0 +1,74 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  cfg = config.programs.go;
+
+in
+
+{
+  meta.maintainers = [ maintainers.rvolosatovs ];
+
+  options = {
+    programs.go = {
+      enable = mkEnableOption "Go";
+
+      package = mkOption {
+        type = types.package;
+        default = pkgs.go;
+        defaultText = "pkgs.go";
+        description = "The Go package to use.";
+      };
+
+      packages = mkOption {
+        type = with types; attrsOf path;
+        default = {};
+        example = literalExample ''
+          {
+            "golang.org/x/time/rate" = builtins.fetchGit "https://go.googlesource.com/text";
+          }
+        '';
+        description = "Packages to add to GOPATH.";
+      };
+
+      goPath = mkOption {
+        type = with types; nullOr str;
+        default = null;
+        example = "go";
+        description = "GOPATH relative to HOME";
+      };
+
+      goBin = mkOption {
+        type = with types; nullOr str;
+        default = null;
+        example = ".local/bin.go";
+        description = "GOBIN relative to HOME";
+      };
+    };
+  };
+
+  config = mkIf cfg.enable (mkMerge [
+    {
+      home.packages = [ cfg.package ];
+
+      home.file =
+        let
+          goPath = if cfg.goPath != null then cfg.goPath else "go";
+
+          mkSrc = n: v: {
+            target = "${goPath}/src/${n}";
+            source = v;
+          };
+        in
+        mapAttrsToList mkSrc cfg.packages;
+    }
+    (mkIf (cfg.goPath != null) {
+      home.sessionVariables.GOPATH = builtins.toPath "${config.home.homeDirectory}/${cfg.goPath}";
+    })
+    (mkIf (cfg.goBin != null) {
+      home.sessionVariables.GOBIN = builtins.toPath "${config.home.homeDirectory}/${cfg.goBin}";
+    })
+  ]);
+}