node_modules/remark-stringify/lib/visitors/definition.js

'use strict'

var uri = require('../util/enclose-uri')
var title = require('../util/enclose-title')

module.exports = definition

var space = ' '
var colon = ':'
var leftSquareBracket = '['
var rightSquareBracket = ']'

// Stringify an URL definition.
//
// Is smart about enclosing `url` (see `encloseURI()`) and `title` (see
// `encloseTitle()`).
//
// ```markdown
// [foo]: <foo at bar dot com> 'An "example" e-mail'
// ```
function definition(node) {
  var content = uri(node.url)

  if (node.title) {
    content += space + title(node.title)
  }

  return (
    leftSquareBracket +
    (node.label || node.identifier) +
    rightSquareBracket +
    colon +
    space +
    content
  )
}