From 4967f0509aca0001156d937f36ed8eb17c72d752 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Thu, 7 Sep 2017 20:37:46 +0200
Subject: [PATCH] nix eval: Add examples

---
 src/nix/eval.cc | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/src/nix/eval.cc b/src/nix/eval.cc
index 981cefa80..e22128692 100644
--- a/src/nix/eval.cc
+++ b/src/nix/eval.cc
@@ -27,6 +27,24 @@ struct CmdEval : MixJSON, InstallablesCommand
         return "evaluate a Nix expression";
     }
 
+    Examples examples() override
+    {
+        return {
+            Example{
+                "To evaluate a Nix expression given on the command line:",
+                "nix eval '(1 + 2)'"
+            },
+            Example{
+                "To evaluate a Nix expression from a file or URI:",
+                "nix eval -f channel:nixos-17.09 hello.name"
+            },
+            Example{
+                "To get the current version of Nixpkgs:",
+                "nix eval --raw nixpkgs.lib.nixpkgsVersion"
+            },
+        };
+    }
+
     void run(ref<Store> store) override
     {
         if (raw && json)