commit 1f131892db09615d6a5f4d1fece1fb8b43c31a74
Author: Waylon Flinn <waylonflinn@gmail.com>
Date:   Fri Mar 11 07:56:48 2016 -0600

    initial commit

diff --git a/README.md b/README.md
new file mode 100644
index 0000000..cebefe7
--- /dev/null
+++ b/README.md
@@ -0,0 +1,51 @@
+# markdown-it-katex
+
+Add Math to your Markdown
+
+KaTeX is fast. This plugin makes it easy to support it in your markdown.
+
+## Usage
+
+```
+npm install markdown-it-katex
+```
+
+Include the KaTeX stylesheet in your html:
+```html
+<link rel="stylesheet"href="//cdnjs.cloudflare.com/ajax/libs/KaTeX/0.3.0/katex.min.css">
+```
+
+If you're using the default markdown-it parser, I also recommend the github stylesheet:
+https://github.com/sindresorhus/github-markdown-css
+
+## Examples
+
+### Inline
+Surround your LaTeX with a single `$` on each side for inline rendering.
+```
+$\sqrt{3x-1}+(1+x)^2$
+```
+
+### Block
+Use two (`$$`) for block rendering. This mode uses bigger symbols and centers
+the result.
+
+```
+$$\begin{array}{c}
+
+\nabla \times \vec{\mathbf{B}} -\, \frac1c\, \frac{\partial\vec{\mathbf{E}}}{\partial t} &
+= \frac{4\pi}{c}\vec{\mathbf{j}}    \nabla \cdot \vec{\mathbf{E}} & = 4 \pi \rho \\
+
+\nabla \times \vec{\mathbf{E}}\, +\, \frac1c\, \frac{\partial\vec{\mathbf{B}}}{\partial t} & = \vec{\mathbf{0}} \\
+
+\nabla \cdot \vec{\mathbf{B}} & = 0
+
+\end{array}$$
+```
+
+## Math Syntax Support
+
+KaTeX is based on TeX and LaTeX. Support for both is growing. Here's a list of
+currently supported functions:
+
+[Function Support in KaTeX](https://github.com/Khan/KaTeX/wiki/Function-Support-in-KaTeX)
diff --git a/browser.js b/browser.js
new file mode 100644
index 0000000..2a703e4
--- /dev/null
+++ b/browser.js
@@ -0,0 +1,84 @@
+var md = require('markdown-it')(),
+	mk = require('./index');
+
+md.use(mk);
+
+var input = document.getElementById('input'),
+	output = document.getElementById('output'),
+	button = document.getElementById('button');
+
+button.addEventListener('click', function(ev){
+
+	var result = md.render(input.value);
+
+	output.innerHTML = result;
+
+});
+
+/*
+
+# Some Math
+
+$\sqrt{3x-1}+(1+x)^2$
+
+# Maxwells Equations
+
+$\nabla \times \vec{\mathbf{B}} -\, \frac1c\, \frac{\partial\vec{\mathbf{E}}}{\partial t}
+= \frac{4\pi}{c}\vec{\mathbf{j}}    \nabla \cdot \vec{\mathbf{E}} = 4 \pi \rho$
+
+$\nabla \times \vec{\mathbf{E}}\, +\, \frac1c\, \frac{\partial\vec{\mathbf{B}}}{\partial t}  = \vec{\mathbf{0}}$ (curl of $\vec{\mathbf{E}}$ is proportional to the time derivative of $\vec{\mathbf{B}}$)
+
+$\nabla \cdot \vec{\mathbf{B}}  = 0$
+
+
+
+\sqrt{3x-1}+(1+x)^2
+
+c = \pm\sqrt{a^2 + b^2}
+
+Maxwell's Equations
+
+\nabla \times \vec{\mathbf{B}} -\, \frac1c\, \frac{\partial\vec{\mathbf{E}}}{\partial t}
+= \frac{4\pi}{c}\vec{\mathbf{j}}    \nabla \cdot \vec{\mathbf{E}} = 4 \pi \rho
+
+\nabla \times \vec{\mathbf{E}}\, +\, \frac1c\, \frac{\partial\vec{\mathbf{B}}}{\partial t}  = \vec{\mathbf{0}}
+
+\nabla \cdot \vec{\mathbf{B}}  = 0
+
+Same thing in a LaTeX array
+\begin{array}{c}
+
+\nabla \times \vec{\mathbf{B}} -\, \frac1c\, \frac{\partial\vec{\mathbf{E}}}{\partial t} &
+= \frac{4\pi}{c}\vec{\mathbf{j}}    \nabla \cdot \vec{\mathbf{E}} & = 4 \pi \rho \\
+
+\nabla \times \vec{\mathbf{E}}\, +\, \frac1c\, \frac{\partial\vec{\mathbf{B}}}{\partial t} & = \vec{\mathbf{0}} \\
+
+\nabla \cdot \vec{\mathbf{B}} & = 0
+
+\end{array}
+
+
+\begin{array}{c}
+y_1 \\
+y_2 \mathtt{t}_i \\
+z_{3,4}
+\end{array}
+
+\begin{array}{c}
+x' &=& &x \sin\phi &+& z \cos\phi \\
+z' &=& - &x \cos\phi &+& z \sin\phi \\
+\end{array}
+
+
+
+# Maxwell's Equations
+
+
+equation | description
+----------|------------
+$\nabla \cdot \vec{\mathbf{B}}  = 0$ | divergence of $\vec{\mathbf{B}}$ is zero
+$\nabla \times \vec{\mathbf{E}}\, +\, \frac1c\, \frac{\partial\vec{\mathbf{B}}}{\partial t}  = \vec{\mathbf{0}}$ |  curl of $\vec{\mathbf{E}}$ is proportional to the rate of change of $\vec{\mathbf{B}}$
+$\nabla \times \vec{\mathbf{B}} -\, \frac1c\, \frac{\partial\vec{\mathbf{E}}}{\partial t} = \frac{4\pi}{c}\vec{\mathbf{j}}    \nabla \cdot \vec{\mathbf{E}} = 4 \pi \rho$ | wha?
+
+![electricity](http://i.giphy.com/Gty2oDYQ1fih2.gif)
+*/
diff --git a/github-markdown.css b/github-markdown.css
new file mode 100644
index 0000000..b74016b
--- /dev/null
+++ b/github-markdown.css
@@ -0,0 +1,656 @@
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+.markdown-body .pl-mh .pl-en,
+.markdown-body .pl-ms {
+  color: #1d3e81;
+  font-weight: bold;
+}
+
+.markdown-body .pl-mq {
+  color: #008080;
+}
+
+.markdown-body .pl-mi {
+  color: #333;
+  font-style: italic;
+}
+
+.markdown-body .pl-mb {
+  color: #333;
+  font-weight: bold;
+}
+
+.markdown-body .pl-md {
+  background-color: #ffecec;
+  color: #bd2c00;
+}
+
+.markdown-body .pl-mi1 {
+  background-color: #eaffea;
+  color: #55a532;
+}
+
+.markdown-body .pl-mdr {
+  color: #795da3;
+  font-weight: bold;
+}
+
+.markdown-body .pl-mo {
+  color: #1d3e81;
+}
+
+.markdown-body kbd {
+  display: inline-block;
+  padding: 3px 5px;
+  font: 11px Consolas, "Liberation Mono", Menlo, Courier, monospace;
+  line-height: 10px;
+  color: #555;
+  vertical-align: middle;
+  background-color: #fcfcfc;
+  border: solid 1px #ccc;
+  border-bottom-color: #bbb;
+  border-radius: 3px;
+  box-shadow: inset 0 -1px 0 #bbb;
+}
+
+.markdown-body .task-list-item {
+  list-style-type: none;
+}
+
+.markdown-body .task-list-item+.task-list-item {
+  margin-top: 3px;
+}
+
+.markdown-body .task-list-item input {
+  margin: 0 0.35em 0.25em -1.6em;
+  vertical-align: middle;
+}
+
+.markdown-body :checked+.radio-label {
+  z-index: 1;
+  position: relative;
+  border-color: #4078c0;
+}
diff --git a/index.html b/index.html
new file mode 100644
index 0000000..a8a3575
--- /dev/null
+++ b/index.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<head>
+	<link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/KaTeX/0.3.0/katex.min.css">
+	<link rel="stylesheet" href="github-markdown.css">
+	<style>
+	#input {
+		display: block;
+		font-size: 12pt;
+
+	}
+	#output {
+		margin: 20px;
+	}
+	</style>
+</head>
+<body>
+	<textarea id="input" type="textarea" rows=10, cols=80>$\sqrt{3x-1}+(1+x)^2$</textarea>
+	<button id="button">Mathdown!</button>
+	<div id="output" class="markdown-body"></div>
+	<script src="./bundle.js"></script>
+</body>
diff --git a/index.js b/index.js
new file mode 100644
index 0000000..5df6286
--- /dev/null
+++ b/index.js
@@ -0,0 +1,256 @@
+/* Process inline math */
+/*
+Like markdown-it-simplemath, this is a stripped down, simplified version of:
+https://github.com/runarberg/markdown-it-math
+
+It differs in that it takes (a subset of) LaTeX as input and relies on KaTeX
+for rendering output.
+*/
+
+'use strict';
+
+var katex = require('katex');
+
+
+function scanDelims(state, start, delimLength) {
+  var pos = start, lastChar, nextChar, count, can_open, can_close,
+      isLastWhiteSpace, isLastPunctChar,
+      isNextWhiteSpace, isNextPunctChar,
+      left_flanking = true,
+      right_flanking = true,
+      max = state.posMax,
+      isWhiteSpace = state.md.utils.isWhiteSpace,
+      isPunctChar = state.md.utils.isPunctChar,
+      isMdAsciiPunct = state.md.utils.isMdAsciiPunct;
+
+  // treat beginning of the line as a whitespace
+  lastChar = start > 0 ? state.src.charCodeAt(start - 1) : 0x20;
+
+  if (pos >= max) {
+    can_open = false;
+  }
+
+  pos += delimLength;
+
+  count = pos - start;
+
+  // treat end of the line as a whitespace
+  nextChar = pos < max ? state.src.charCodeAt(pos) : 0x20;
+
+  isLastPunctChar = isMdAsciiPunct(lastChar) || isPunctChar(String.fromCharCode(lastChar));
+  isNextPunctChar = isMdAsciiPunct(nextChar) || isPunctChar(String.fromCharCode(nextChar));
+
+  isLastWhiteSpace = isWhiteSpace(lastChar);
+  isNextWhiteSpace = isWhiteSpace(nextChar);
+
+  if (isNextWhiteSpace) {
+    left_flanking = false;
+  } else if (isNextPunctChar) {
+    if (!(isLastWhiteSpace || isLastPunctChar)) {
+      left_flanking = false;
+    }
+  }
+
+  if (isLastWhiteSpace) {
+    right_flanking = false;
+  } else if (isLastPunctChar) {
+    if (!(isNextWhiteSpace || isNextPunctChar)) {
+      right_flanking = false;
+    }
+  }
+
+  can_open = left_flanking;
+  can_close = right_flanking;
+
+  return {
+    can_open: can_open,
+    can_close: can_close,
+    delims: count
+  };
+}
+
+
+function makeMath_inline(open, close) {
+  return function math_inline(state, silent) {
+    var startCount,
+        found,
+        res,
+        token,
+        closeDelim,
+        max = state.posMax,
+        start = state.pos,
+        openDelim = state.src.slice(start, start + open.length);
+
+    if (openDelim !== open) { return false; }
+    if (silent) { return false; }    // Don’t run any pairs in validation mode
+
+    res = scanDelims(state, start, openDelim.length);
+    startCount = res.delims;
+
+    if (!res.can_open) {
+      state.pos += startCount;
+      // Earlier we checked !silent, but this implementation does not need it
+      state.pending += state.src.slice(start, state.pos);
+      return true;
+    }
+
+    state.pos = start + open.length;
+
+    while (state.pos < max) {
+      closeDelim = state.src.slice(state.pos, state.pos + close.length);
+      if (closeDelim === close) {
+        res = scanDelims(state, state.pos, close.length);
+        if (res.can_close) {
+          found = true;
+          break;
+        }
+      }
+
+      state.md.inline.skipToken(state);
+    }
+
+    if (!found) {
+      // Parser failed to find ending tag, so it is not a valid math
+      state.pos = start;
+      return false;
+    }
+
+    // Found!
+    state.posMax = state.pos;
+    state.pos = start + close.length;
+
+    // Earlier we checked !silent, but this implementation does not need it
+    token = state.push('math_inline', 'math', 0);
+    token.content = state.src.slice(state.pos, state.posMax);
+    token.markup = open;
+
+    state.pos = state.posMax + close.length;
+    state.posMax = max;
+
+    return true;
+  };
+}
+
+function makeMath_block(open, close) {
+  return function math_block(state, startLine, endLine, silent) {
+    var openDelim, len, params, nextLine, token, firstLine, lastLine, lastLinePos,
+        haveEndMarker = false,
+        pos = state.bMarks[startLine] + state.tShift[startLine],
+        max = state.eMarks[startLine];
+
+    if (pos + open.length > max) { return false; }
+
+    openDelim = state.src.slice(pos, pos + open.length);
+
+    if (openDelim !== open) { return false; }
+
+    pos += open.length;
+    firstLine = state.src.slice(pos, max);
+
+    // Since start is found, we can report success here in validation mode
+    if (silent) { return true; }
+
+    if (firstLine.trim().slice(-close.length) === close) {
+      // Single line expression
+      firstLine = firstLine.trim().slice(0, -close.length);
+      haveEndMarker = true;
+    }
+
+    // search end of block
+    nextLine = startLine;
+
+    for (;;) {
+      if (haveEndMarker) { break; }
+
+      nextLine++;
+
+      if (nextLine >= endLine) {
+        // unclosed block should be autoclosed by end of document.
+        // also block seems to be autoclosed by end of parent
+        break;
+      }
+
+      pos = state.bMarks[nextLine] + state.tShift[nextLine];
+      max = state.eMarks[nextLine];
+
+      if (pos < max && state.tShift[nextLine] < state.blkIndent) {
+        // non-empty line with negative indent should stop the list:
+        break;
+      }
+
+      if (state.src.slice(pos, max).trim().slice(-close.length) !== close) {
+        continue;
+      }
+
+      if (state.tShift[nextLine] - state.blkIndent >= 4) {
+        // closing block math should be indented less then 4 spaces
+        continue;
+      }
+
+      lastLinePos = state.src.slice(0, max).lastIndexOf(close);
+      lastLine = state.src.slice(pos, lastLinePos);
+
+      pos += lastLine.length + close.length;
+
+      // make sure tail has spaces only
+      pos = state.skipSpaces(pos);
+
+      if (pos < max) { continue; }
+
+      // found!
+      haveEndMarker = true;
+    }
+
+    // If math block has heading spaces, they should be removed from its inner block
+    len = state.tShift[startLine];
+
+    state.line = nextLine + (haveEndMarker ? 1 : 0);
+
+    token = state.push('math_block', 'math', 0);
+    token.block = true;
+    token.content = (firstLine && firstLine.trim() ? firstLine + '\n' : '') +
+      state.getLines(startLine + 1, nextLine, len, true) +
+      (lastLine && lastLine.trim() ? lastLine : '');
+    token.info = params;
+    token.map = [ startLine, state.line ];
+    token.markup = open;
+
+    return true;
+  };
+}
+
+
+module.exports = function math_plugin(md) {
+  // Default options
+
+  var inlineOpen = '$',
+      inlineClose = '$',
+      blockOpen = '$$',
+      blockClose = '$$';
+  // set KaTeX as the renderer for markdown-it-simplemath
+  var katexInline = function(latex){
+    return katex.renderToString(latex, {"displayMode" : false});
+  };
+
+  var inlineRenderer = function(tokens, idx){
+    return katexInline(tokens[idx].content);
+  };
+
+  var katexBlock = function(latex){
+    return katex.renderToString(latex, {"displayMode" : true});
+  }
+
+  var blockRenderer = function(tokens, idx){
+    return  katexBlock(tokens[idx].content) + '\n';
+  }
+
+  var math_inline = makeMath_inline(inlineOpen, inlineClose);
+  var math_block = makeMath_block(blockOpen, blockClose);
+
+  md.inline.ruler.before('escape', 'math_inline', math_inline);
+  md.block.ruler.after('blockquote', 'math_block', math_block, {
+    alt: [ 'paragraph', 'reference', 'blockquote', 'list' ]
+  });
+  md.renderer.rules.math_inline = inlineRenderer;
+  md.renderer.rules.math_block = blockRenderer;
+};
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..c13e1de
--- /dev/null
+++ b/package.json
@@ -0,0 +1,21 @@
+{
+  "name": "markdown-it-katex",
+  "version": "1.0.0",
+  "description": "Easy KaTeX support for markdown-it ",
+  "main": "index.js",
+  "scripts": {
+    "watch": "watchify browser.js -o bundle.js -v",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [
+    "markdown",
+    "KaTeX",
+    "math",
+    "LaTeX"
+  ],
+  "author": "waylonflinn@gmail.com",
+  "license": "MIT",
+  "dependencies": {
+    "katex": "^0.5.1"
+  }
+}