# Hermitage

Ruby library for generation of image galleries (thumbnails and full size images viewer).

## Requirements

Hermitage requires Ruby on Rails version >= 3.1 with support of jQuery and CoffeeScript (jquery-rails and coffee-rails gems, respectively).

## Installation

Add this line to your application's Gemfile:

    gem 'hermitage'

And then execute:

    $ bundle

Or install it yourself as:

    $ gem install hermitage

Also you have to run installation script to create config file and add require statement to your application.js file.

    rails generate hermitage:install

## Quick Start

Add this line to your view:

    render_gallery_for @images # or any other array of objects with image attachments

It is enough in theory.

## Usage

The example from Quick Start section works well when you are using Paperclip gem for file attachment and your model looks like this:

    class Image < ActiveRecord::Base
      attr_accessible :file
      has_attached_file :file, styles: { thumbnail: "100x100>" }
    end

Then

    render_gallery_for @images

will render markup for the gallery.

In other cases some configuration is necessary.

### Options

You can pass options hash to `render_gallery_for` method if you want to customize Hermitage behavior.

#### Specify Image Path

E.g. your `Photo` model has methods `image_full` and `image_thumb` that return path to full image and its thumbnail, respectively.
Then you can write in your view file:

    render_gallery_for @photos, attribute_full_size: 'image_full', attribute_thumbnail: 'image_thumb'

Then Hermitage will use the specified methods to get paths to your images and thumbnails.

If the only method returns both paths according to passed parameters you can specify it like this:

    render_gallery_for @posts, attribute_full_size: 'attachment(:full)', attribute_thumbnail: 'attachment(:thumbnail)'

#### Markup

Hermitage renders markup that will look nice with Twitter Bootstrap by default:

    <ul class="thumbnails">
      <li class="span4">
        <a href="/path/to/full/image" class="thumbnail" rel="hermitage">
          <img src="/path/to/thumbnail" />
        </a>
      </li>
    </ul>

You can configure any element of this markup by overwriting `list_tag`, `item_tag`, `list_class`, `item_class`, `link_class` and `image_class` properties.

For example this line of code:

    render_gallery_for @images, list_tag: :div, item_tag: :p, item_class: 'image'

will render the following markup:

    <div class="thumbnails">
      <p class="image">
        <a href="/path/to/full/image" class="thumbnail" rel="hermitage">
          <img src="/path/to/thumbnail" />
        </a>
      </p>
    </div>

### Configuration

It is more handy to use configs to customize Hermitage behavior.

When you call `render_gallery_for` method Hermitage looks for config with name formed by the plural form of class name of the first element in passed array.
In the example above Hermitage tries to find :images config because first argument of `render_gallery_for` method was array of Image instances.
If there is no proper config :default config is used.

Hermitage configs are described in config/initializers/hermitage.rb file.

#### Overwrite Defaults

You can overwrite :default config. These changes will be applied to all the galleries in your application.

Uncoment the following lines in config/initializers/hermitage.rb file and make some changes here:

    Hermitage.configs[:default].merge!({
      attribute_full_size: 'image.url(:medium)',
      attribute_thumbnail: 'image.url(:small)'
    })

Now Hermitage will use `image.url` method with :medium or :small argument to get images for the gallery.

#### Custom Configs

When there are several galleries that need different markup it is better to use custom configs.

For example there are 2 models in your application:

    class Picture < ActiveRecord::Base
      def image_path(style = :large)
        # magically returns correct image url for :large and :small styles
      end
    end

and

    class Post < ActiveRecord::Base
      attr_accessible :attachment
      has_attached_file :attachment, styles: { tiny: "200x200>" }
    end

Suppose that pictures should be rendered with Twitter Bootstrap style, but posts should be wrapped by simple blocks.
Then your config/initializers/hermitage.rb could looks like this:

    # Some rules for :default config if needed...

    Hermitage.configs[:pictures] = {
      attribute_full_size: 'image_path',
      attribute_thumbnail: 'image_path(:small)'
    }

    Hermitage.configs[:pictures] = {
      attribute_full_size: 'attachment',
      attribute_thumbnail: 'attachment(:tiny)',
      list_tag: :div,
      item_tag: div,
      list_class: 'posts',
      item_class: 'post'
    }

Now when you write `render_gallery_for @pictures` or `render_gallery_for @posts` Hermitage will automatically choose the proper config.

#### Configs Priority

You have noticed that it is not neccessary to specify every parameter in config or options block.
So, Hermitage looks for parameters with the following priority:

* It uses all parameters from default config;
* Then it overwrites some of them by custom config's parameters if they were specified;
* Finally it overwrites both of them by the values from options hash passed to `render_gallery_for` method (if there are such values, of course).

## Contributing

1. Fork it
2. Create your feature branch (`git checkout -b my-new-feature`)
3. Commit your changes (`git commit -am 'Add some feature'`)
4. Push to the branch (`git push origin my-new-feature`)
5. Create new Pull Request