Revise index.js to use wrapped markdown-it instance

.travis.yml

 language: node_js
 node_js:
 - '0.10'
-script: make test-ci
+script:
+- make test-ci
+deploy:
+  provider: npm
+  email: tatsy.mail@gmail.com
+  api_key:
+    secure: NPmR0/0uUF3sL6PI7rhO7pNOxa0doCcp7MXbRvOcenw9mF6CVFJNSfCJmCST59gGCVarYxzR8s3oGsTGvNB7i3WF6mv4WcH3lS7ZY/8PPWEiCzFu7H6J/faULO3zj2ZarxGSEesilWZYs8dF0Dkkxe+cafiEMVnU3wK9WfR4t10=
+  on:
+    tags: true
+    repo: tatsy/markdown-it-imsize

index.js

@@ -3,11 +3,11 @@
 
 'use strict';
 
-var mdit = require('markdown-it')();
 var parseImageSize = require('./helpers/parse_image_size');
 var normalizeReference = require('./helpers/normalize_reference.js');
 
-function image_with_size(state, silent) {
+function image_with_size(md) {
+  return function(state, silent) {
     var code,
         href,
         label,
@@ -28,7 +28,7 @@ function image_with_size(state, silent) {
     if (state.src.charCodeAt(state.pos + 1) !== 0x5B/* [ */) { return false; }
 
     labelStart = state.pos + 2;
-  labelEnd = mdit.helpers.parseLinkLabel(state, state.pos + 1, false);
+    labelEnd = md.helpers.parseLinkLabel(state, state.pos + 1, false);
 
     // parser failed to find ']', so it's not a valid link
     if (labelEnd < 0) { return false; }
@@ -52,7 +52,7 @@ function image_with_size(state, silent) {
       // [link](  <href>  "title"  )
       //      ^^^^^^ parsing link destination
       start = pos;
-    res = mdit.helpers.parseLinkDestination(state.src, pos, state.posMax);
+      res = md.helpers.parseLinkDestination(state.src, pos, state.posMax);
       if (res.ok && state.md.inline.validateLink(res.str)) {
         href = res.str;
         pos = res.pos;
@@ -70,7 +70,7 @@ function image_with_size(state, silent) {
 
       // [link](  <href>  "title"  )
       //          ^^^^^^^ parsing link title
-    res = mdit.helpers.parseLinkTitle(state.src, pos, state.posMax);
+      res = md.helpers.parseLinkTitle(state.src, pos, state.posMax);
       if (pos < max && start !== pos && res.ok) {
         title = res.str;
         pos = res.pos;
@@ -130,7 +130,7 @@ function image_with_size(state, silent) {
 
       if (pos < max && state.src.charCodeAt(pos) === 0x5B/* [ */) {
         start = pos + 1;
-      pos = mdit.helpers.parseLinkLabel(state, pos);
+        pos = md.helpers.parseLinkLabel(state, pos);
         if (pos >= 0) {
           label = state.src.slice(start, pos++);
         } else {
@@ -183,13 +183,16 @@ function image_with_size(state, silent) {
     state.pos = pos;
     state.posMax = max;
     return true;
+  };
 }
 
-function tokenize_imsize(tokens, idx, options, env, self) {
-  var src = ' src="' + mdit.utils.escapeHtml(tokens[idx].src) + '"';
+
+function tokenize_imsize(md) {
+  return function(tokens, idx, options, env, self) {
+    var src = ' src="' + md.utils.escapeHtml(tokens[idx].src) + '"';
     var title = '';
     if (tokens[idx].title) {
-    title = ' title="' + mdit.utils.escapeHtml(mdit.utils.replaceEntities(tokens[idx].title)) + '"';
+      title = ' title="' + md.utils.escapeHtml(md.utils.replaceEntities(tokens[idx].title)) + '"';
     }
     var alt = ' alt="' + self.renderInlineAsText(tokens[idx].tokens, options, env) + '"';
     var width = tokens[idx].width !== '' ? ' width="' + tokens[idx].width + '"' : '';
@@ -197,9 +200,10 @@ function tokenize_imsize(tokens, idx, options, env, self) {
     var size = width + height;
     var suffix = options.xhtmlOut ? ' /' : '';
     return '<img' + src + alt + title + size + suffix + '>';
+  };
 }
 
 module.exports = function imsize_plugin(md) {
-  md.renderer.rules.imsize = tokenize_imsize;
-  md.inline.ruler.before('emphasis', 'imsize', image_with_size);
+  md.renderer.rules.imsize = tokenize_imsize(md);
+  md.inline.ruler.before('emphasis', 'imsize', image_with_size(md));
 };

package.json

 {
   "name": "markdown-it-imsize",
-  "version": "0.1.0",
+  "version": "0.1.2",
   "description": "Markdown-it plugin to specify image size",
   "main": "index.js",
   "scripts": {