mdast-util-wiki-link

Extension for mdast-util-from-markdown and mdast-util-to-markdown to support [[Wiki Links]].

• Parse wiki-style links and render them as anchors
• Differentiate between "new" and "existing" wiki links by giving the parser a list of existing permalinks
• Parse aliased wiki links i.e [[Real Page:Page Alias]]

Using remark? You might want to use remark-wiki-link instead of using this package directly.

Usage

Markdown to AST

import fromMarkdown from 'mdast-util-from-markdown'
import { syntax } from 'micromark-extension-wiki-link'
import * as wikiLink from 'mdast-util-wiki-link'

let ast = fromMarkdown('[[Test Page]]', {
  extensions: [syntax()],
  mdastExtensions: [wikiLink.fromMarkdown()]
})

The AST node will look like this:

{
    value: 'Test Page',
    data: {
        alias: 'Test Page',
        permalink: 'test_page',
        exists: false,
        hName: 'a',
        hProperties: {
            className: 'internal new',
            href: '#/page/test_page'
        },
        hChildren: [{
            type: 'text',
            value: 'Test Page'
        }]
    }
}

• data.alias: The display name for this link
• data.permalink: The permalink for this page. This permalink is computed from node.value using options.pageResolver, which can be passed in when initializing the plugin.
• data.exists: Whether the page exists. A page exists if its permalink is found in options.permalinks, passed when initializing the plugin.
• data.hProperties.className: Classes that are automatically attached to the a when it is rendered as HTML. These are configurable with options.wikiLinkClassName and options.newClassName. options.newClassName is attached when data.exists is false.
• data.hProperties.href: href value for the rendered a. This href is computed using options.hrefTemplate.

The hName and other h fields provide compatibility with rehype.

AST to Markdown

Taking the ast from the prior example, let's go back to markdown:

import { fromMarkdown } from 'mdast-util-from-markdown'
import * as wikiLink from 'mdast-util-wiki-link'

let markdownString = toMarkdown(ast, { extensions: [wikiLink.toMarkdown()] }).trim()
console.log(markdownString)
// [[Wiki Link]]

Configuration options

Both fromMarkdown and toMarkdown accept configuration as an object.

For example, one may configure fromMarkdown like so:

let ast = fromMarkdown('[[Test Page]]', {
  extensions: [syntax()],
  mdastExtensions: [wikiLink.fromMarkdown({ permalinks: ['wiki_page'] })] // <--
})

fromMarkdown

• options.permalinks [String]: An array of permalinks that should be considered existing pages. If a wiki link is parsed and its permalink matches one of these permalinks, node.data.exists will be true.

• options.pageResolver (pageName: String) -> [String]: A function that maps a page name to an array of possible permalinks. These possible permalinks are cross-referenced with options.permalinks to determine whether a page exists. If a page doesn't exist, the first element of the array is considered the permalink.

  The default pageResolver is:

(name) => [name.replace(/ /g, '_').toLowerCase()]

• options.hrefTemplate (permalink: String) -> String: A function that maps a permalink to some path. This path is used as the href for the rendered a.

  The default hrefTemplate is:

(permalink) => `#/page/${permalink}`

• options.wikiLinkClassName [String]: a class name that is attached to any rendered wiki links. Defaults to "internal".
• options.newClassName [String]: a class name that is attached to any rendered wiki links that do not exist. Defaults to "new".

toMarkdown

• options.aliasDivider [String]: a string to be used as the divider for aliases. See the section below on Aliasing pages. Defaults to ":".

Aliasing pages

Aliased pages are supported with the following markdown syntax:

[[Real Page:Page Alias]]

And will produce this HTML when rendered:

<a class="internal new" href="#/page/real_page">Page Alias</a>