Introduction

An API Blueprint renderer that supports multiple themes and outputs static HTML that can be served by any web host. API Blueprint is a Markdown-based document format that lets you write API descriptions and documentation in a simple and straightforward way. Currently supported is API Blueprint format 1A.

Note: This is an experiment to upgrade in forking aglio, which is unmaintained.

Features

• Parsing with drafter.js
• Asyncronous processing
• Multiple templates/themes
• Support for custom colors, templates, and theme engines
• Include other documents in your blueprint
• Commandline executable aglio -i service.apib -o api.html
• Live-reloading preview server aglio -i service.apib --server
• Node.js library require('aglio')
• Excellent test coverage
• ESLinted

Example Output

Example output is generated from the example API Blueprint using the default Olio theme.

• Default theme two column or three column
• Streak theme two column or three column
• Flatly theme two column or three column
• Slate theme two column or three column
• Cyborg theme two column or three column

Including Files

It is possible to include other files in your blueprint by using a special include directive with a path to the included file relative to the current file's directory. Included files can be written in API Blueprint, Markdown or HTML (or JSON for response examples). Included files can include other files, so be careful of circular references.

<!-- include(filename.md) -->

For tools that do not support this include directive it will just render out as an HTML comment. API Blueprint may support its own mechanism of including files in the future, and this syntax was chosen to not interfere with the external documents proposal while allowing aglio users to include documents today.

Installation & Usage

There are two ways to use aglio: as an executable or as a library for Node.js.

Executable

Install aglio via NPM. You need Node.js installed.

npm install -g aglio

Then, start generating HTML.

# Default theme
aglio -i input.apib -o output.html

# Use three-column layout
aglio -i input.apib --theme-template triple -o output.html

# Built-in color scheme
aglio --theme-variables slate -i input.apib -o output.html

# Customize a built-in style
aglio --theme-style default --theme-style ./my-style.less -i input.apib -o output.html

# Custom layout template
aglio --theme-template /path/to/template.pug -i input.apib -o output.html

# Custom theme engine
aglio -t my-engine -i input.apib -o output.html

# Run a live preview server on http://localhost:3000/
aglio -i input.apib -s

# Print output to terminal (useful for piping)
aglio -i input.apib -o -

# Disable condensing navigation links
aglio --no-theme-condense -i input.apib -o output.html

# Render full-width page instead of fixed max width
aglio --theme-full-width -i input.apib -o output.html

# Set an explicit file include path and read from stdin
aglio --include-path /path/to/includes -i - -o output.html

# Output verbose error information with stack traces
aglio -i input.apib -o output.html --verbose

Node.js Library

You can also use aglio as a library. First, install and save it as a dependency:

npm install --save aglio

Then, convert some API Blueprint to HTML:

var aglio = require('aglio');

// Render a blueprint with a template by name
var blueprint = '# Some API Blueprint string';
var options = {
  themeVariables: 'default'
};

aglio.render(blueprint, options, function (err, html, warnings) {
    if (err) return console.log(err);
    if (warnings) console.log(warnings);

    console.log(html);
});

// Render a blueprint with a custom template file
options = {
  themeTemplate: '/path/to/my-template.pug'
};
aglio.render(blueprint, options, function (err, html, warnings) {
    if (err) return console.log(err);
    if (warnings) console.log(warnings);

    console.log(html);
});


// Pass custom locals along to the template, for example
// the following gives templates access to lodash and async
options = {
    themeTemplate: '/path/to/my-template.pug',
    locals: {
        _: require('lodash'),
        async: require('async')
    }
};
aglio.render(blueprint, options, function (err, html, warnings) {
   if (err) return console.log(err);
   if (warnings) console.log(warnings);

   console.log(html);
});

Reference

The following methods are available from the aglio library:

aglio.collectPathsSync (blueprint, includePath)

Get a list of paths that are included in the blueprint. This list can be watched for changes to do things like live reload. The blueprint's own path is not included.

var blueprint = '# GET /foo\n<-- include(example.json -->\n';
var watchPaths = aglio.collectPathsSync(blueprint, process.cwd())

aglio.render (blueprint, options, callback)

Render an API Blueprint string and pass the generated HTML to the callback. The options can either be an object of options or a simple layout name or file path string. Available options are:

Option	Type	Default	Description
filterInput	bool	true	Filter \r and \t from the input
includePath	string	process.cwd()	Base directory for relative includes
locals	object	{}	Extra locals to pass to templates
theme	string	'default'	Theme name to load for rendering

In addition, the default theme provides the following options:

Option	Type	Default	Description
themeVariables	string	default	Built-in color scheme or path to LESS or CSS
themeCondenseNav	bool	true	Condense single-action navigation links
themeFullWidth	bool	false	Use the full page width
themeTemplate	string		Layout name or path to custom layout file
themeStyle	string	default	Built-in style name or path to LESS or CSS
themePermalinkSymbol	string	¶	The symbol in the permalink anchor.

var blueprint = '...';
var options = {
    themeTemplate: 'default',
    locals: {
        myVariable: 125
    }
};

aglio.render(blueprint, options, function (err, html, warnings) {
    if (err) return console.log(err);

    console.log(html);
});

aglio.renderFile (inputFile, outputFile, options, callback)

Render an API Blueprint file and save the HTML to another file. The input/output file arguments are file paths. The options behaves the same as above for aglio.render, except that the options.includePath defaults to the basename of the input filename.

aglio.renderFile('/tmp/input.apib', '/tmp/output.html', options, function (err, warnings) {
    if (err) return console.log(err);
    if (warnings) console.log(warnings);
});

Development

Pull requests are encouraged! Feel free to fork and hack away, especially on new themes. The build system in use is Grunt, so make sure you have it installed:

# Lint/compile the js
npm run lint

# Run the test suite
npm run test

# Generate an HTML test coverage report
npm run coverage

# Render examples
npm run gen:examples

Customizing Output

Aglio is split into two components: a base that contains logic for loading API Blueprint, handling commandline arguments, etc and a theme engine that handles turning the API Blueprint AST into HTML. The default theme engine that ships with Aglio is called olio, included in this repository. Templates are written in pug. The default stylesheets are written in LESS.

While developing customizations, you may want to disable caching using the NOCACHE environment variable.

NOCACHE=1 aglio -i input.apib [customization options]

Custom Colors & Style

Aglio's default theme provides a way to easily override colors, fonts, padding, etc to match your company's style. This is done by providing your own LESS or CSS file(s) via the --theme-variables and --theme-style options. For example:

# Use my custom colors
aglio --theme-variables /path/to/my-colors.less -i input.apib -o output.html

The my-variables.less file might contain a custom HTTP PUT color specification:

/* HTTP PUT */
@put-color: #f0ad4e;
@put-background-color: #fcf8e3;
@put-text-color: contrast(@put-background-color);
@put-border-color: darken(spin(@put-background-color, -10), 5%);

See the default variables file for examples of which variables can be set.

The --theme-style option lets you override built-in styles with your own LESS or CSS definitions. It is processed after the variables have been defined, so the variables are available for your use. If you wish to modify a rule from an existing built-in style then you must copy the style. The order of loading roughly follows:

1. Default variables
2. Built-in or user-supplied variables
3. Built-in or user-supplied style

Note that these options can be passed more than once, in which case they will be loaded in the order they were passed. This lets you, for example, load a variable preset like flatly and modify one of the colors with your own LESS file. Keep in mind that when you want to modify a built-in style you must explicitly list the style, e.g. --theme-style default --theme-style my-style.less.

Built-in Colors

• cyborg
• default
• flatly
• slate

Built-in Styles

• default

Customizing Layout Templates

The --theme-template option allows you to provide a custom layout template that overrides the default. This is specified in the form of a Pug template file. See the default template file for an example.

The locals available to templates look like the following:

Name	Description
api	The API Blueprint AST from Protagonist
condenseNav	If true, you should condense the nav if possible
date	Date and time handling from Moment.js
fullWidth	If true, you should consume the entire page width
highlight	A function (code, lang) to highlight a piece of code
markdown	A function to convert Markdown strings to HTML
slug	A function to convert a string to a slug usable as an ID
hash	A function to return an hash (currently MD5)

Built-in Layout Templates

• default

Using Custom Themes

While Aglio ships with a default theme, you have the option of installing and using third-party theme engines. They may use any technology and are not limited to Pug and LESS. Consult the theme's documentation to see which options are available and how to use and customize the theme. Common usage between all themes:

# Install a custom theme engine globally
npm install -g aglio-theme-<NAME>

# Render using a custom theme engine
aglio -t <NAME> -i input.apib -o output.html

# Get a list of all options for a theme
aglio -t <NAME> --help

Writing a Theme Engine

Theme engines are simply Node.js modules that provide two public functions and follow a specific naming scheme (aglio-theme-NAME). Because they are their own npm package they can use whatever technologies the theme engine author wishes. The only hard requirement is to provide these two public functions:

getConfig()

Returns configuration information about the theme, such as the API Blueprint format that is supported and any options the theme provides.

render(input, options, done)

Render the given input API Blueprint AST with the given options. Calls done(err, html) when finished, either passing an error or the rendered HTML output as a string.

Example Theme

The following is a very simple example theme. Note: it only returns a very simple string instead of rending out the API Blueprint AST. Normally you would invoke a template engine and output the resulting HTML that is generated.

// Get the theme's configuration options
exports.getConfig = function () {
  return {
    // This is a list of all supported API Blueprint format versions
    formats: ['1A'],
    // This is a list of all options your theme accepts. See
    // here for more: https://github.com/bcoe/yargs#readme
    // Note: These get prefixed with `theme` when you access
    // them in the options object later!
    options: [
      {
        name: 'name',
        description: 'Your name',
        default: 'world'
      }
    ]
  };
}

// Asyncronously render out a string
exports.render = function (input, options, done) {
  // Normally you would use some template engine here.
  // To keep this code really simple, we just print
  // out a string and ignore the API Blueprint.
  done(null, 'Hello, ' + options.themeName + '!');
};

Example use:

# Install the theme globally
npm install -g aglio-theme-hello

# Render some output!
aglio -t hello -i example.apib -o -
=> 'Hello, world!'

# Pass in the custom theme option!
aglio -t hello --theme-name Daniel -i example.apib -o -
=> 'Hello, Daniel!'

You are free to use whatever template system (Pug, EJS, Nunjucks, etc) and any supporting libraries (e.g. for CSS) you like.

License

Copyright (c) 2016 Daniel G. Taylor

http://dgt.mit-license.org/