keppler/lib/app/watcher.js

'use strict'

// Depedencies
const chokidar = require('chokidar')
const fs = require('fs')
const mime = require('mime')
const socketIoClient = require('socket.io-client')

/**
 * Watcher class
 */
class Watcher
{
    /**
     * Constructor
     */
    constructor(_config)
    {
        this.config = _config
        this.path = process.cwd()

        this.setSocket()
        this.watch()
    }

    /**
     * Set socket
     */
    setSocket()
    {
        // Connect to watcher socket
        this.socket = socketIoClient(`${this.config.domain}/watcher`)

        // Connect event
        this.socket.on('connect', () =>
        {
            this.socket.emit('start_project', { name: this.config.name, path: this.path })

            // Debug
            if(this.config.debug)
            {
                console.log('watcher > socket'.green.bold + ' - ' + 'connect'.cyan)
            }
        })

        // Disconnect event
        this.socket.on('disconnect', () =>
        {
            // Debug
            if(this.config.debug)
            {
                console.log('watcher > socket'.green.bold + ' - ' + 'disconnect'.cyan)
            }
        })
    }

    /**
     * Watch
     * Listen to modifications on files and folders
     */
    watch()
    {
        // Create ignored regex
        const regexs = []
        const Minimatch = require('minimatch').Minimatch

        for(const _excludeKey in this.config.exclude)
        {
            const _exclude = this.config.exclude[_excludeKey]
            const minimatch = new Minimatch(_exclude, { dot: true })
            
            let regex = '' + minimatch.makeRe()

            regex = regex.replace('/^', '')
            regex = regex.replace('$/', '')

            regexs.push(regex)
        }

        const regex = new RegExp(regexs.join('|'))

        // Set up
        this.watcher = chokidar.watch(
            this.path,
            {
                // ignored: /[\/\\]\./,
                ignored: regex,
                ignoreInitial: true
            }
        )

        if(this.config.debug >= 1)
        {
            console.log('watcher'.green.bold + ' - ' + 'start watching'.cyan + ' - ' + this.path.cyan)
        }

        // Add event
        this.watcher.on('add', (_path) =>
        {
            // Set up
            const relativePath = _path.replace(this.path, '.')
            const mimeType = mime.lookup(relativePath)
            const file = {}

            file.path     = relativePath
            file.canRead = true

            // Test mime type
            if(mimeType.match(/^(audio)|(video)|(image)/))
            {
                file.canRead = false
            }

            // Retrieve stats
            fs.stat(_path, (error, stats) =>
            {
                // Max file size
                if(this.config.maxFileSize < stats.size)
                {
                    file.canRead = false
                }

                // Read
                fs.readFile(_path, (error, data) =>
                {
                    if(file.canRead)
                    {
                        file.content = data.toString()
                    }

                    // Emit
                    this.socket.emit('create_file', file)
                })
            })

            // Debug
            if(this.config.debug >= 1)
            {
                console.log('watcher'.green.bold + ' - ' + 'add'.cyan + ' - ' + relativePath.cyan)
            }
        })

        // Change event
        this.watcher.on('change', (_path) =>
        {
            // Set up
            const relativePath = _path.replace(this.path, '.')
            const mimeType = mime.lookup(relativePath)
            const file = {}

            file.path = relativePath
            file.canRead = true

            // Test mime type
            if(mimeType.match(/^(audio)|(video)|(image)/))
            {
                file.canRead = false
            }

            // Retrieve stats
            fs.stat(_path, (error, stats) =>
            {
                // Test max file size
                if(this.config.maxFileSize < stats.size)
                {
                    file.canRead = false
                }

                // Read
                fs.readFile(_path, (error, data) =>
                {
                    if(file.canRead)
                    {
                        file.content = data.toString()
                    }

                    // Emit
                    this.socket.emit('update_file', file)
                })
            })

            // Debug
            if(this.config.debug >= 1)
            {
                console.log('watcher'.green.bold + ' - ' + 'change'.cyan + ' - ' + relativePath.cyan)
            }
        })

        // Unlink event
        this.watcher.on('unlink', (_path) =>
        {
            // Set up
            const relativePath = _path.replace(this.path, '.')

            // Emit
            this.socket.emit('delete_file', { path: relativePath })

            // Debug
            if(this.config.debug >= 1)
            {
                console.log('watcher'.green.bold + ' - ' + 'unlink'.cyan + ' - ' + relativePath.cyan)
            }
        })

        // AddDir event
        this.watcher.on('addDir', (_path) =>
        {
            // Set up
            const relativePath = _path.replace(this.path, '.')

            // Emit
            this.socket.emit('create_folder', { path: relativePath })

            // Debug
            if(this.config.debug >= 1)
            {
                console.log('watcher'.green.bold + ' - ' + 'addDir'.cyan + ' - ' + relativePath.cyan)
            }
        })

        // UnlinkDir event
        this.watcher.on('unlinkDir', (_path) =>
        {
            // Set up
            const relativePath = _path.replace(this.path, '.')

            // Emit
            this.socket.emit('delete_folder', { path: relativePath })

            // Debug
            if(this.config.debug >= 1)
            {
                console.log('watcher'.green.bold + ' - ' + 'unlinkDir'.cyan + ' - ' + relativePath.cyan)
            }
        })
    }
}

module.exports = Watcher