styles link insert to html head

cssInsertToHtml.coffee

fs = require('fs')
cheerio = require('cheerio')

staticFolder = 'static'
cssFolder = 'css'
cssRoot = __dirname + '/' + cssFolder

htmlFolder = 'views'
htmlRoot = __dirname + '/../application/' + htmlFolder

skipFiles = ['.DS_Store', 'mail']

Core = module.exports =
    getFileList: (folderPath = null, cb) ->
        console.log 'getFileList begin ', arguments
        return null  unless folderPath

        return fs.readdirSync(folderPath) unless cb

        fs.readdir folderPath, (err, files) ->
            (if (err) then cb(null) else cb(files))


    getFile: (path = null, cb) ->
        console.log 'getFile begin ', arguments
        return null  unless path

        unless cb
            f = fs.readFileSync(path)
            if f
                return f.toString()
            else
                return null

        fs.readFile path, (err, data) ->
            (if (err) then cb(null) else cb(data.toString()))

    saveFile: (path = null, data = null, cb) ->
        console.log 'saveFile begin ', arguments
        return null  unless path
        return null  unless data

        if typeof(data) is 'string'
            data = new Buffer(data, 'utf8')

        unless cb
            return fs.writeFileSync(path, data)

        fs.writeFile path, data, (err) ->
            if(err)
                console.log 'err = ' ,err
            else
                console.log 'save success = ', path


htmlPaths = Core.getFileList(htmlRoot)
for i of htmlPaths
    htmlPath = htmlPaths[i]

    if skipFiles.indexOf(htmlPath) >= 0
        continue

    htmlPath = htmlRoot+ '/' + htmlPath
    html = Core.getFile(htmlPath)
    $ = cheerio.load(html)
    style = ''

    $('link').each (index, item)=>
        $item = $(item)
        src = $item.attr('href')
        srcArray = src.split('/')
        src = cssRoot + '/' + srcArray[srcArray.length-1]

        style += Core.getFile(src) + '\n'

    if style.length is 0
        continue

    $('head').append('<style>\n' + style + '</style>\n')

    Core.saveFile(htmlPath, $.html())