From 69e3ffb076931aba73b5fcc41f5264f5f62c5ce9 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Thu, 21 Apr 2016 14:58:32 +0200
Subject: nix --help: Show usage examples

---
 src/nix/command.cc | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'src/nix/command.cc')

diff --git a/src/nix/command.cc b/src/nix/command.cc
index 986953fd845d..c8d91737d8be 100644
--- a/src/nix/command.cc
+++ b/src/nix/command.cc
@@ -5,6 +5,21 @@ namespace nix {
 
 Commands * RegisterCommand::commands = 0;
 
+void Command::printHelp(const string & programName, std::ostream & out)
+{
+    Args::printHelp(programName, out);
+
+    auto exs = examples();
+    if (!exs.empty()) {
+        out << "\n";
+        out << "Examples:\n";
+        for (auto & ex : exs)
+            out << "\n"
+                << "  " << ex.description << "\n" // FIXME: wrap
+                << "  $ " << ex.command << "\n";
+    }
+}
+
 MultiCommand::MultiCommand(const Commands & _commands)
     : commands(_commands)
 {
-- 
cgit 1.4.1