Improved preset name error reporting

lib/index.js

@@ -212,7 +212,7 @@ function MarkdownIt(presetName, options) {
 
 
   this.options = {};
-  this.configure(config[presetName]);
+  this.configure(presetName);
 
   if (options) { this.set(options); }
 }
@@ -254,9 +254,15 @@ MarkdownIt.prototype.set = function (options) {
  * will give better compatibility with next versions.
  **/
 MarkdownIt.prototype.configure = function (presets) {
-  var self = this;
+  var self = this, presetName;
 
-  if (!presets) { throw new Error('Wrong `markdown-it` preset, check name/content'); }
+  if (utils.isString(presets)) {
+    presetName = presets;
+    presets = config[presetName];
+    if (!presets) { throw new Error('Wrong `markdown-it` preset "' + presetName + '", check name'); }
+  }
+
+  if (!presets) { throw new Error('Wrong `markdown-it` preset, can\'t be empty'); }
 
   if (presets.options) { self.set(presets.options); }
 

support/api_header.md

@@ -12,10 +12,10 @@ In most cases you will use `markdown-it` in very simple way:
 ```javascript
 var md = require('markdown-it')();
 
-var result = md.render(your_markdown_string);
+var result = md.render('your_markdown_string');
 
 // Or for inline (without paragraths & blocks)
-var resultInline = md.renderInline(your_markdown_inline_string);
+var resultInline = md.renderInline('your_markdown_inline_string');
 ```
 
 ### Advanced use