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- PngCrush = require('pngcrush')
- fs = require("fs")
- logger = require("logger-sharelatex")
- module.exports =
- compressPng: (localPath, callback)->
- optimisedPath = "#{localPath}-optimised"
- startTime = new Date()
- logger.log localPath:localPath, optimisedPath:optimisedPath, "optimising png path"
- readStream = fs.createReadStream(localPath)
- writeStream = fs.createWriteStream(optimisedPath)
- readStream.on "error", (err)->
- logger.err err:err, localPath:localPath, "something went wrong getting read stream for compressPng"
- callback(err)
- writeStream.on "error", (err)->
- logger.err err:err, localPath:localPath, "something went wrong getting write stream for compressPng"
- callback(err)
- myCrusher = new PngCrush()
- myCrusher.on "error", (err)->
- logger.err err:err, localPath:localPath, "error compressing file"
- callback err
- readStream.pipe(myCrusher).pipe(writeStream)
- writeStream.on "finish", ->
- timeTaken = new Date() - startTime
- logger.log localPath:localPath, timeTaken:timeTaken, "finished converting file"
- fs.rename optimisedPath, localPath, callback
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