From ea18c73f11ebfbcabe07e5247ae49904d8620c19 Mon Sep 17 00:00:00 2001
From: Connor Hindley <connor.hindley@tanium.com>
Date: Wed, 17 Nov 2021 11:01:40 -0700
Subject: [PATCH] Only prepend EnvPrefix if .Env is not empty.

Before this change the EnvPrefix was applied to fields without env
specified, which resulted in strange and confusing help output.
---
 build.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/build.go b/build.go
index aa5a143..3e8be10 100644
--- a/build.go
+++ b/build.go
@@ -139,7 +139,9 @@ MAIN:
 			name = tag.Prefix + name
 		}
 
-		tag.Env = tag.EnvPrefix + tag.Env
+		if tag.Env != "" {
+			tag.Env = tag.EnvPrefix + tag.Env
+		}
 
 		// Nested structs are either commands or args, unless they implement the Mapper interface.
 		if field.value.Kind() == reflect.Struct && (tag.Cmd || tag.Arg) && k.registry.ForValue(fv) == nil {