From 7afefcf75dcebb55e895b8818a90b5d6d16524a2 Mon Sep 17 00:00:00 2001
From: Mario Rodas <marsam@users.noreply.github.com>
Date: Fri, 28 Dec 2018 07:00:00 -0500
Subject: [PATCH] opam: add module

---
 modules/misc/news.nix     |  7 ++++++
 modules/modules.nix       |  1 +
 modules/programs/opam.nix | 52 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 60 insertions(+)
 create mode 100644 modules/programs/opam.nix

diff --git a/modules/misc/news.nix b/modules/misc/news.nix
index 1ef1fe138..4af6d6aa5 100644
--- a/modules/misc/news.nix
+++ b/modules/misc/news.nix
@@ -922,6 +922,13 @@ in
           when activating your Home Manager configuration.
         '';
       }
+
+      {
+        time = "2018-12-28T12:32:30+00:00";
+        message = ''
+          A new module is available: 'programs.opam'.
+        '';
+      }
     ];
   };
 }
diff --git a/modules/modules.nix b/modules/modules.nix
index 45ab16a36..45cb8d518 100644
--- a/modules/modules.nix
+++ b/modules/modules.nix
@@ -69,6 +69,7 @@ let
     (loadModule ./programs/notmuch.nix { })
     (loadModule ./programs/obs-studio.nix { })
     (loadModule ./programs/offlineimap.nix { })
+    (loadModule ./programs/opam.nix { })
     (loadModule ./programs/pidgin.nix { })
     (loadModule ./programs/rofi.nix { })
     (loadModule ./programs/ssh.nix { })
diff --git a/modules/programs/opam.nix b/modules/programs/opam.nix
new file mode 100644
index 000000000..d62b50dd3
--- /dev/null
+++ b/modules/programs/opam.nix
@@ -0,0 +1,52 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  cfg = config.programs.opam;
+
+in
+
+{
+  meta.maintainers = [ maintainers.marsam ];
+
+  options.programs.opam = {
+    enable = mkEnableOption "Opam";
+
+    package = mkOption {
+      type = types.package;
+      default = pkgs.opam;
+      defaultText = "pkgs.opam";
+      description = "Opam package to install.";
+    };
+
+    enableBashIntegration = mkOption {
+      default = true;
+      type = types.bool;
+      description = ''
+        Whether to enable Bash integration.
+      '';
+    };
+
+    enableZshIntegration = mkOption {
+      default = true;
+      type = types.bool;
+      description = ''
+        Whether to enable Zsh integration.
+      '';
+    };
+  };
+
+  config = mkIf cfg.enable {
+    home.packages = [ cfg.package ];
+
+    programs.bash.initExtra = mkIf cfg.enableBashIntegration ''
+      eval "$(${cfg.package}/bin/opam env --shell=bash)"
+    '';
+
+    programs.zsh.initExtra = mkIf cfg.enableZshIntegration ''
+      eval "$(${cfg.package}/bin/opam env --shell=zsh)"
+    '';
+  };
+}