From 1c58e13bee6715c668e93cd4ec93bc5d5fd1a4ad Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Tue, 29 Aug 2017 11:52:55 +0200
Subject: [PATCH] Hide commands that don't have a description

These are assumed to be internal.
---
 src/nix/command.cc | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/nix/command.cc b/src/nix/command.cc
index e88c834ab..f90d848f2 100644
--- a/src/nix/command.cc
+++ b/src/nix/command.cc
@@ -50,8 +50,11 @@ void MultiCommand::printHelp(const string & programName, std::ostream & out)
     out << "Available commands:\n";
 
     Table2 table;
-    for (auto & command : commands)
-        table.push_back(std::make_pair(command.second->name(), command.second->description()));
+    for (auto & command : commands) {
+        auto descr = command.second->description();
+        if (!descr.empty())
+            table.push_back(std::make_pair(command.second->name(), descr));
+    }
     printTable(out, table);
 
     out << "\n";