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bylexus / Grunt Md2html

Licence: mit
Small Grunt MultiTask to convert Markdown files to HTML, supporting Grunt >= 1.0.0

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Build Status

grunt-md2html

Small Grunt MultiTask based on the nodejs package marked to convert Markdown files to HTML.

Note: Since version 0.5.0, this Grunt MultiTask needs nodejs >= 8 and grunt >= 1.0.0.

  • Takes input Markdown-Files
  • process them using the grunt-internal template engine (lodash)
  • converts them to HTML either one-by-one or many-to-one
  • optionally highlight code parts using highligh.js with optional style string
  • Supports embedded PlantUML to directly render images from PlantUML Code

Table of Contents

Getting Started

This plugin requires Grunt ^1.0.0

If you haven't used Grunt before, be sure to check out the Getting Started guide, as it explains how to create a Gruntfile as well as install and use Grunt plugins. Once you're familiar with that process, you may install this plugin with this command:

npm install grunt-md2html --save-dev

One the plugin has been installed, it may be enabled inside your Gruntfile with this line of JavaScript:

grunt.loadNpmTasks('grunt-md2html');

The "md2html" task

Overview

In your project's Gruntfile, add a section named md2html to the data object passed into grunt.initConfig().

grunt.initConfig({
  md2html: {
    options: {
      // Task-specific options go here.
    },
    your_target: {
      // Target-specific file lists and/or options go here.
    },
  },
})

Options

options.layout

Type: String Default value: null

A path to a layout file: A Layout file defines the global surrounding layout, e.g. an HTML header / footer. Within the Layout file you can then include the actual processed .md-file content.

Example layout file:

<!DOCTYPE html>
<html>
    <head>
        <link rel="stylesheet" type="text/css" href="<%= basepath %>/style.css">
        <title></title>
    </head>
    <body>
        <%= document %>
    </body>
</html>

This layout file adds an HTML skeleton around each processed output file, replacing the template strings basepath and document (the processed content).

options.basePath

Type: String Default value: null

If basePath is set, you can use <%= basepath %> in your .md / layout file, which is expanded to a relative path from the actual output file to the given basePath. Useful to link static resources like stylesheets in the layout file

options.markedOptions

Type: Object Default value: {}

Options to be set on the marked package, see https://github.com/chjj/marked for details. E.g.:

markedOptions: {
  gfm: false
}

disables the GIT flavored markdown.

options.templateData

Type: Object Default value: {}

Additional data which is passed to the template engine before the .md file is processed. The data object's content is directly available as template vars / functions. See Usage Examples for more information.

options.separator

Type: String Default value: '\n\n'

A string value that is used to concatenate the .md files if used in one-outputfile mode

Template variables

Each markdown file is first processed by the Grunt-internal Template Engine (see http://gruntjs.com/api/grunt.template). In addition to the grunt-own template variables and functions, you can use the following variables which are replaced BEFORE processing the MD file:

  • document: Contains the processed HTML code for a destination file. Useful for a Layout file. (For backward compatibility: use {DOC})
  • basepath: Points relatively to the dest path of the actual output, or to the given basePath in the options. (For backward compatibility: use {BASEPATH})
  • destination: The relative path to the actual destination file. (For backward compatibility: use {DEST})
  • src: The original .md source file in which the variable occurs

options.highlightjs

Type: Object Default value:

options.highlightjs: {
    enabled: false,      // disabled by default
    style: 'monokai',    // highlightjs default theme (theme file name without .css)
    compressStyle: true, // minified version of the string based style sheet
    options: {}          // options for the highlightjs constructor
}

md2html includes highlightjs if you want to highlight source code in the markdown file. Code blocks then are enriched by highlightjs with HTML and style elements: The HTML is parsed and code blocks are sent through highlightjs before writing the final HTML.

Enable code highlighting / highlightjs tags by setting enabled to true.

To style the enriched code blocks, you have to include an official highlightjs CSS file:

You have two options for adding highlightjs styling / theming:

  1. Include a highlightjs CSS file in your layout manually (see example here )
  2. Use the stringified CSS version in your template: grunt-md2html reads the original highlightjs style sheet as CSS string, and allows you to use it directly in your markdown file by outputting the template variable highlightjs_style:
<style>
  <%= highlightjs_style %>
</style>

An example:

<!-- layout HTML file -->
<!DOCTYPE html>
<html>
    <head>
        <style>
          <%= highlightjs_style %>
        </style>
    </head>
    <body>
        <%= document %>
    </body>
</html>

Markdown file with code snippet:
=================================
Now follows some javascript code:

```
var f = function(var1) {
    console.log(var1);
}
```

options.plantuml

  • Type: Object
  • Default value: null
  • Available configs:
options.plantuml: {
     // Local run:
     // Full execution command of PlantUML, without options:
    exec: 'java -jar plantuml.jar'
    // Remote run:
    // Provide the base URL for the PlantUML Render Servlet:
    renderServerUrl: "http://www.plantuml.com/plantuml"
}

Either exec or renderServerUrl is needed:

Usage Examples

Single HTML file output

In this example, all found .md files are converted to HTML and ONE html output file is generated:

grunt.initConfig({
  md2html: {
      one_file: {
        options: {},
        files: [{
          src: ['my/md/files/**/*.md'],
          dest: 'out/output.html'
        }]
      }
    }
})

One HTML file per md file output

In this example, all found .md files are converted to an HTML file in the same directory. Note that this is a base functionality of grunt's file expanding facility:

grunt.initConfig({
  md2html: {
      multiple_files: {
        options: {},
        files: [{
          expand: true,
          cwd: 'base/path/to/md/files',
          src: ['**/*.md'],
          dest: 'output',
          ext: '.html'
        }]
      }
    }
});

Options example

This example just demonstrates the different options:

  • layout: A layout file used for each processed output file
  • basePath: The <%= basepath %> template variable which can be used within the docs points relatively to the basePath
  • separator: concatenator string when using multiple md files which go to one output file
grunt.initConfig({
  md2html: {
      multiple_files: {
        options: {
          layout: 'path/to/layout.html',
          basePath: 'path/to',
          markedOptions: {
            gfm: false,
            langPrefix: 'code-'
          }
        },
        files: [{
          expand: true,
          cwd: 'base/path/to/md/files',
          src: ['**/*.md'],
          dest: 'output',
          ext: '.html'
        }]
      }
    }
});

Template example, including highlighjs

This example demonstrates the usage of the pre-processing Template engine which can be used to process arbitary javascript variable / functions. It also demonstrates code highlighting using highlightjs:

grunt config
grunt.initConfig({
  md2html: {
      multiple_files: {
        options: {
          basePath: 'path/to',
          // Provide the function `basename` and a variable `author` to the templates
          templateData: {
            basename: function(src) {
                return src.substr(src.lastIndexOf(path.sep)+1);
            },
            author: process.env.USER
          },
          highlightjs: {
            enabled: true,
            style: 'paraiso.dark',
            compressStyle: true
          },
        },
        files: [{
          expand: true,
          cwd: 'base/path/to/md/files',
          src: ['**/*.md'],
          dest: 'output',
          ext: '.html'
        }]
      }
    }
});
Template .md file
<style type="text/css"><%= highlightjs_style %></style>

Hello. This is an example written by <%= author %>.
It comes from the file <%= basename(src) %>, and ends in the file <%= destination %>.
Created on <%= grunt.template.today('yyyy-mm-dd HH:MM:ss') %>.

And now some highlighted code:

<pre><code>
    var fact = function(f) {
        if (f > 1) {
            return f * (fact(f-1));
        } else return 1;
    }
</code></pre>

Include other .md files from within .md

You can also include (load) other .md files within your .md files. This makes the generation of a separate TOC file, which is included in each output file, very easy:

Example: The main file with a TOC

Note that the file path must be relative to your Gruntfile:

An MD file. Include the TOC here:
<% print(grunt.file.read('gruntfile/rel/path/to/md/file.md')) %>
The separate TOC file
Table of contents:

* foo
* bar

The output html then looks as follows:

An MD file. Include the TOC here:
Table of contents:

* foo
* bar
Use '_' in your included file names to filter them from output creation

If you don't want to have an output file generated for each included file, you can use a file name convention:

  • Start each included filename with a '_'
  • Use the filter property in the Gruntifle's file definition.

Example:

grunt.initConfig({
    md2html: {
      includeTest: {
        files: [{
          expand: true,
          cwd: 'docs',
          src: ['**/*.md'],
          // Filter away all files that begin with '_':
          filter: function(src) {
            if (path.basename(src)[0] === '_') { return false; } else { return true; }
          },
          dest: 'output',
          ext: '.html'
        }]
      }
});

PlantUML example

You can directly embed PlantUML code into your markdown/html files:

<!-- document.md: -->
Markdown with embedded PlantUML
-------------------------------

Here comes my Diagram:

@startuml name-of-image
class Foo {
}
class Bar {
}
Foo <|-- Bar
@enduml

... and another:

@startuml name-of-2nd-image
Bob -> Alice : hello
@enduml

It is important to define the imagename @startuml [imgname]: This will be used as the image filename (plus ending).

The snippets are then parsed on build time, images are generated and replaced with their respective image markdown tags:

<!-- document.md: -->
Markdown with embedded PlantUML
-------------------------------

Here comes my Diagram:

![name-of-image](name-of-image.png)

... and another:

![name-of-2nd-image](name-of-2nd-image.png)

The Gruntfile must enable either local or remote PlantUML rendering settings:

// Gruntfile.js:
grunt.initConfig({
  md2html: {
      some_diagrams: {
        options: {
            plantuml: {
                // Local plantuml executable:
                exec: '/usr/bin/plantuml',
                // ... or remote render server:
                renderServerUrl: "http://www.plantuml.com/plantuml"
            }
        },

        files: [{
          expand: true,
          cwd: 'base/path/to/md/files',
          src: ['**/*.md'],
          dest: 'output',
          ext: '.html'
        }]
      }
    }
});

Release History

  • 0.1.1: Changed Markdown parser: node-markdown replaced by marked
  • 0.1.1: Changed Markdown parser: node-markdown replaced by marked
  • 0.1.0: Very first release, no testing yet
  • 0.1.5: Fixed: '$&' in html causes the tool to crash
  • 0.1.6: Updated 'marked' dependency: now uses marked 0.2.10 as dependant version
  • 0.1.7: Updated 'marked' dependency: now uses marked 0.3.2
  • 0.2.0: Process MD files with the grunt-internal Template engine (lodash) first. Keeping backwards-compatibility.
  • 0.2.1: Fixing Relative Path bug: introduced in 0.2.0, the basepath was no longer relative to the options.basePath set in config in scenarios using more than one directory level.
  • 0.2.2: Updated dev environment and added unit tests
  • 0.3.0: highlightjs support
  • 0.3.1:
    • changed dependencies to support grunt 1.x
    • updated highlightjs related documentation
  • 0.4.0:
    • Adding embedded PlantUML support
    • Updating dependencies 0.4.1:
    • Fixing bug: if no PlantuML matches were found, but a plantuml config present, matches was null
    • minor textual changes 0.5.0:
    • Dropping legacy support:
      • NodeJS >= 8 is needed
      • Grunt >= 1.0.0 is needed
    • Fixing Regex s flag lack - replaced by [\s\S]
    • Fixing some nasty bugs introduced in 0.4.x
    • Updated linting and testing framework 0.5.1: Bugfix: basepath variable not evaluated correctly on multiple files

License

(c) 2013-2020 Alexander Schenkel Licensed under the MIT License

Note that the project description data, including the texts, logos, images, and/or trademarks, for each open source project belongs to its rightful owner. If you wish to add or remove any projects, please contact us at [email protected].