From f29e2292c90d4fbdadce041b1c9d649aca3c602b Mon Sep 17 00:00:00 2001
From: Robert Maynard <robert.maynard@kitware.com>
Date: Thu, 8 Nov 2018 09:27:28 -0500
Subject: cpack: When given an unknown generator print out all valid generators

This makes cpack behavior match cmake when passed an invalid generator
---
 Source/CPack/cpack.cxx | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/Source/CPack/cpack.cxx b/Source/CPack/cpack.cxx
index 3df1b36..7cf69fc 100644
--- a/Source/CPack/cpack.cxx
+++ b/Source/CPack/cpack.cxx
@@ -21,6 +21,7 @@
 #include "cmCPackLog.h"
 #include "cmDocumentation.h"
 #include "cmDocumentationEntry.h"
+#include "cmDocumentationFormatter.h"
 #include "cmGlobalGenerator.h"
 #include "cmMakefile.h"
 #include "cmStateSnapshot.h"
@@ -360,7 +361,19 @@ int main(int argc, char const* const* argv)
             cmCPack_Log(&log, cmCPackLog::LOG_ERROR,
                         "Could not create CPack generator: " << gen
                                                              << std::endl);
-
+            // Print out all the valid generators
+            cmDocumentation generatorDocs;
+            std::vector<cmDocumentationEntry> v;
+            for (auto const& g : generators.GetGeneratorsList()) {
+              cmDocumentationEntry e;
+              e.Name = g.first;
+              e.Brief = g.second;
+              v.push_back(std::move(e));
+            }
+            generatorDocs.SetSection("Generators", v);
+            std::cerr << "\n";
+            generatorDocs.PrintDocumentation(cmDocumentation::ListGenerators,
+                                             std::cerr);
             parsed = 0;
           }
 
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