From d8b3b4e4749995ad735513e2f60e719fba42a4da Mon Sep 17 00:00:00 2001
From: William S Fulton <wsf@fultondesigns.co.uk>
Date: Tue, 15 Apr 2014 20:54:16 +0100
Subject: [PATCH] Improve missing JS engine error message

---
 Doc/Manual/Javascript.html    | 7 ++++---
 Source/Modules/javascript.cxx | 2 +-
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/Doc/Manual/Javascript.html b/Doc/Manual/Javascript.html
index 7acf37fe3..8d8f436ca 100644
--- a/Doc/Manual/Javascript.html
+++ b/Doc/Manual/Javascript.html
@@ -8,9 +8,10 @@
 <h1>SWIG and Javascript</h1>
 <p>This chapter describes SWIG's support of Javascript. It does not cover SWIG basics, but only information that is specific to this module.</p>
 <h2>Overview</h2>
-<p>JavaScript is a prototype-based scripting language that is dynamic, weakly typed and has first-class functions. Its arguably the most popular language for web development. Beyond of being a browser-based scripting language, with <a href="http://nodejs.org">node.js</a> Javascript has found its way to a backend development language, too.</p>
-<p>Native Javascript extensions can be used for applications that embed a web-browser view or that embed a Javascript engine (such as <em>node.js</em>). Extending a general purpose web-browser is not possible as this would be severe security issue.</p>
-<p>SWIG Javasript currently supports <strong>JavascriptCore</strong>, the Javascript engine used by <code>Safari/Webkit</code>, and <strong>v8</strong>, which is used by <code>Chromium</code> and <code>node.js</code>.</p>
+<p>Javascript is a prototype-based scripting language that is dynamic, weakly typed and has first-class functions. Its arguably the most popular language for web development.
+Javascript has gone beyond being a browser-based scripting language and with <a href="http://nodejs.org">node.js</a>, it is also used as a backend development language.</p>
+<p>Native Javascript extensions can be used for applications that embed a web-browser view or that embed a Javascript engine (such as <em>node.js</em>). Extending a general purpose web-browser is not possible as this would be a severe security issue.</p>
+<p>SWIG Javascript currently supports <strong>JavascriptCore</strong>, the Javascript engine used by <code>Safari/Webkit</code>, and <strong>v8</strong>, which is used by <code>Chromium</code> and <code>node.js</code>.</p>
 <p><a href="http://www.webkit.org/">WebKit</a> is a modern browser implementation available as open-source which can be embedded into an application.</p>
 <h2>Preliminaries</h2>
 <h3>Running SWIG</h3>
diff --git a/Source/Modules/javascript.cxx b/Source/Modules/javascript.cxx
index eae594727..72dc5c210 100644
--- a/Source/Modules/javascript.cxx
+++ b/Source/Modules/javascript.cxx
@@ -551,7 +551,7 @@ void JAVASCRIPT::main(int argc, char *argv[]) {
     }
   default:
     {
-      Printf(stderr, "SWIG Javascript: Unknown emitter type.\n");
+      Printf(stderr, "SWIG Javascript: Unknown emitter type. Please specify one of -jsc -v8 or -node.\n");
       SWIG_exit(-1);
       break;
     }