From ead7db76c0931975a847be8985ba69ec462df2b3 Mon Sep 17 00:00:00 2001
From: "Daniel G. Taylor" <danielgtaylor@gmail.com>
Date: Tue, 24 Jan 2017 09:26:33 -0800
Subject: [PATCH] Add support for math formulas, add -n option, fix example
 slideshow link, bump version to 1.2.0

---
 README.md           |  1 +
 data/example.md     | 19 ++++++++++++++++++-
 data/index.template |  1 +
 tech-talk.go        |  6 ++++--
 www/script.js       | 11 +++++++++++
 5 files changed, 35 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index 0ecd8dc..4f6d4e6 100644
--- a/README.md
+++ b/README.md
@@ -61,6 +61,7 @@ Now, make your customizations!
 - [Javascript (transitions)](https://github.com/danielgtaylor/tech-talk/tree/master/www/script.js)
 - [Terminal default font size](https://github.com/danielgtaylor/tech-talk/tree/master/www/wetty/wetty.js)
 - [Example slideshow](https://github.com/danielgtaylor/tech-talk/tree/master/data/example.md)
+- [HTML template](https://github.com/danielgtaylor/tech-talk/blob/master/data/index.template)
 
 Once you are ready:
 
diff --git a/data/example.md b/data/example.md
index 2a64884..348f966 100644
--- a/data/example.md
+++ b/data/example.md
@@ -2,7 +2,7 @@
 
 This is an example. Press <kbd>&#8680;</kbd> to continue.
 
-[View example source](https://github.com/danielgtaylor/tech-talk/data/example.md)
+[View example source](https://github.com/danielgtaylor/tech-talk/blob/master/data/example.md)
 
 ---
 
@@ -57,6 +57,23 @@ But you aren't limited to just list items.
 
 ---
 
+# Math & Formulas
+
+Complex formulas are easy to display with [AsciiMath](http://asciimath.org/#syntax) using `%%`, or Tex / LaTeX using `$$` delimiters thanks to MathJax.
+
+.center[
+**AsciiMath example**
+<!-- Notice that we escape the `*` because it has special meaning in Markdown -->
+%%i = sum(1.65 \* 0.000125^(o - 1) \* (1 - 2.718^(-0.04t) / 4.15) \* (7490duz) / (100h))%%
+]
+
+.center[
+**LaTeX example**
+$$ax^2 + bx + c = 0$$
+]
+
+---
+
 # Images & Videos
 
 Assets in the same folder as the Markdown slides can be referenced relative to the root of the server.
diff --git a/data/index.template b/data/index.template
index b5e2324..21bca1d 100644
--- a/data/index.template
+++ b/data/index.template
@@ -17,6 +17,7 @@
       <a class="btn">Close</a>
     </div>
     <script src="https://gnab.github.io/remark/downloads/remark-latest.min.js"></script>
+    <script  src="https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-MML-AM_CHTML&delayStartupUntil=configured"></script>
     <script src="/static/script.js"></script>
   </body>
 </html>
diff --git a/tech-talk.go b/tech-talk.go
index 263ca26..f078038 100644
--- a/tech-talk.go
+++ b/tech-talk.go
@@ -25,7 +25,7 @@ type TemplateValues struct {
 }
 
 const DEFAULT_HOST = "localhost"
-const VERSION = "1.1.0"
+const VERSION = "1.2.0"
 
 var indexTemplate *template.Template
 var socketServer *socketio.Server
@@ -36,6 +36,7 @@ var sshType *string
 var sshHost *string
 var key *string
 var pass *string
+var noBrowser *bool
 
 // Checks if a file exists and can be accessed.
 func check_access(filename string) bool {
@@ -144,6 +145,7 @@ func main() {
 	pass = flag.String("pass", "", "SSH `password` (for internal SSH)")
 
 	// Misc options
+	noBrowser = flag.Bool("n", false, "Do not automatically open browser")
 	version := flag.Bool("v", false, "Alias for --version")
 	flag.BoolVar(version, "version", false, "Print program version and exit")
 
@@ -187,7 +189,7 @@ func main() {
 
 	log.Println("Server started on http://localhost:4000/")
 
-	if check_access("/usr/bin/open") {
+	if !*noBrowser && check_access("/usr/bin/open") {
 		c := exec.Command("/usr/bin/open", "http://localhost:4000")
 		c.Start()
 	}
diff --git a/www/script.js b/www/script.js
index f6e1777..a1fa87e 100644
--- a/www/script.js
+++ b/www/script.js
@@ -102,3 +102,14 @@ window.addEventListener('load', () => {
     document.body.classList.remove('preload');
   }, 200);
 });
+
+// Setup MathJax
+MathJax.Hub.Config({
+  asciimath2jax: {
+    // Since Markdown makes heavy use of backticks, prefer a syntax that
+    // won't conflict with Markdown processing.
+    delimiters: [['%%','%%']]
+  }
+});
+
+MathJax.Hub.Configured();