remarkable link fixer

fixer.js

// with inspiration from: https://github.com/vitaliy-bobrov/remarkable-extlink
// for use with: https://github.com/jonschlinkert/remarkable

const md = new Remarkable()

function externalize(mark) {
    const linkRegex = /href="([^"]*)"/
    const fix = (link = '') => {
        if (link.indexOf('http') !== 0) {
            return 'http://' + link
        } else {
            return link
        }
    }

    const originalRenderer = mark.renderer.rules.link_open
    mark.renderer.rules.link_open = function() {
        const result = originalRenderer.apply(null, arguments)
        const linkParts = linkRegex.exec(result)
        const link = linkParts[1]
        return result
            .replace(`href="${link}"`, `href="${fix(link)}"`)
            .replace('>', ' target="_blank">')
    }
}

md.use(externalize)