Code files

Chapter03/watching-files-and-directories/my-file.txt

@@ -0,0 +1 @@
+back again

Chapter03/watching-files-and-directories/package.json

@@ -0,0 +1,15 @@
+{
+  "name": "watching-files-and-directories",
+  "version": "1.0.0",
+  "description": "",
+  "main": "watcher.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "David Mark Clements",
+  "license": "MIT",
+  "dependencies": {
+    "human-time": "0.0.1"
+  }
+}

Chapter03/watching-files-and-directories/watcher.js

@@ -0,0 +1,44 @@
+'use strict'
+
+const fs = require('fs')
+const human = require('human-time')
+
+const interval = 5007
+const file = process.argv[2]
+let exists = false
+
+if (!file) {
+  console.error('supply a file')
+  process.exit(1)
+}
+
+const created = ({birthtime}) => 
+  !exists && (Date.now() - birthtime) < interval
+
+const missing = ({birthtime, mtime, atime, ctime}) => 
+  !(birthtime|mtime|atime|ctime)
+
+const updated = (cur, prv) => cur.mtime !== prv.mtime
+
+fs.watchFile(file, {interval}, (cur, prv) => {
+  if (missing(cur)) {
+    const msg = exists ? 'removed' : 'doesn\'t exist'
+    exists = false
+    return console.log(`${file} ${msg}`)
+  }
+
+  if (created(cur)) {
+    exists = true
+    return console.log(`${file} created ${human((cur.birthtime))}`)
+  }
+
+  exists = true
+
+  if (updated(cur, prv)) {
+    return console.log(`${file} updated ${human((cur.mtime))}`)
+  }
+
+  console.log(`${file} modified ${human((cur.mtime))}`)
+})
+
+

Chapter03/watching-files-and-directories/watching-with-chokidar/package.json

@@ -0,0 +1,16 @@
+{
+  "name": "watching-with-chokidar",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "David Mark Clements",
+  "license": "MIT",
+  "dependencies": {
+    "chokidar": "^1.6.0",
+    "human-time": "0.0.1"
+  }
+}

Chapter03/watching-files-and-directories/watching-with-chokidar/watcher.js

@@ -0,0 +1,28 @@
+'use strict'
+
+const chokidar = require('chokidar')
+const human = require('human-time')
+const watcher = chokidar.watch(process.argv[2] || '.', {
+  alwaysStat: true
+})
+
+watcher.on('ready', () => {
+  watcher
+    .on('add', (file, stat) => {
+      console.log(`${file} created ${human((stat.birthtime))}`)
+    })
+    .on('unlink', (file) => {
+      console.log(`${file} removed`)
+    })
+    .on('change', (file, stat) => {
+      const msg = (+stat.ctime === +stat.mtime) ? 'updated' : 'modified'
+      console.log(`${file} ${msg} ${human((stat.ctime))}`)
+    })
+    .on('addDir', (dir, stat) => {
+      console.log(`${dir} folder created ${human((stat.birthtime))}`)
+    })
+    .on('unlinkDir', (dir) => {
+      console.log(`${dir} folder removed`)
+    })
+})
+