HackMD/lib/letter-avatars.js

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JavaScript
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'use strict'
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// external modules
var randomcolor = require('randomcolor')
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// core
module.exports = function (name) {
var color = randomcolor({
seed: name,
luminosity: 'dark'
})
var letter = name.substring(0, 1).toUpperCase()
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var svg = '<?xml version="1.0" encoding="UTF-8" standalone="no"?>'
svg += '<svg xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://www.w3.org/2000/svg" height="96" width="96" version="1.1" viewBox="0 0 96 96">'
svg += '<g>'
svg += '<rect width="96" height="96" fill="' + color + '" />'
svg += '<text font-size="64px" font-family="sans-serif" text-anchor="middle" fill="#ffffff">'
svg += '<tspan x="48" y="72" stroke-width=".26458px" fill="#ffffff">' + letter + '</tspan>'
svg += '</text>'
svg += '</g>'
svg += '</svg>'
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return 'data:image/svg+xml;base64,' + new Buffer(svg).toString('base64')
}