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markdown-it-named-headers

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Plugin for markdown-it markdown parser. Adds name attributes to header tags in output.

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// repository documentation

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# Markdown-it Named Headers

A plugin for [markdown-it](https://github.com/markdown-it/markdown-it). Makes header elments have identifer attributes.

```
# Example Header   -->   <h1 id="example-header">Example</h1>
```

By default, it uses [string.js](http://stringjs.com/)'s [slugify](http://stringjs.com/#methods/slugify) to translate header text into a url safe name. You can override this. See _Options_.

Cribbed heavily from https://github.com/valeriangalliat/markdown-it-anchor

## Install

```
npm install --save-dev markdown-it-named-headers
```

## Usage

Use with plain old node:

```js
var md   = require('markdown-it'),
    mdnh = require('markdown-it-named-headers');

md.use(mdnh, options);
```

Use as part of a Gulp workflow: (Note: You don't need to require named-headers in your gulpfile. gulp-markdown-it takes care of that for you).

```js
var gulp = require('gulp'),
    md = require('gulp-markdown-it');
gulp.task('md', [], function() {
    return gulp.src( '**/*.md' )
        .pipe(md({
            plugins: ['markdown-it-named-headers']
        }))
        .pipe(gulp.dest('dist'));
});
```

### Options

#### Slugify

```js
{
   slugify: my_slug_function
}
```

If string.js's slugify doesn't fit your needs, you can simply pass in your own slugify function. Basically, the API is: accept any string, return a string suitable for a name attribute. Example:

```js
function slugify(input_string) {
    var output_string = my_transform_logic(input_string);
    return output_string;
}
```

Since we use IDs, we should avoid duplicating them. A second parameter is passed. It is an empty object that will persist across a single call to render. In other words, you can use it to maintain a hash of used_headers per page.

The default slugify method looks something like this:

```js
function slugify(input_string, used_headers) {
  var slug = string(input_string).slugify().toString();
  if( used_headers[slug] ) {
    used_headers[slug]++;
    slug += used_headers[slug];
  } else {
    used_headers[slug] += '-' + 1;
  }
  return slug;
}
```

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