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build/node_modules/fqueue/examples/du2.js

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+
+var fs = require('fs'),
+    path = require('path'),
+    util = require('util'),
+    FunctionQueue = require('..');
+
+function Diskusage(options) {
+  FunctionQueue.call(this, options);
+  this.dirs = 0;
+  this.files = 0;
+  this.bytes = 0;
+}
+util.inherits(Diskusage, FunctionQueue);
+
+Diskusage.prototype.run = function(dir) {
+  this.start(this._stat, [dir]);
+  return this;
+};
+
+Diskusage.prototype._readdir = function(p) {
+  var self = this, args = arguments;
+  
+  fs.readdir(p, function(err, files) {
+    if(err) {
+      self.error(err, self._readdir, args);
+    } else {
+      files.forEach(function(file) {
+        self.enqueue(self._stat, [path.join(p, file)]);
+      });
+    }
+    self.done();
+  });
+};
+
+Diskusage.prototype._stat = function(p) {
+  var self = this, args = arguments;
+  
+  fs.stat(p, function(err, s) {
+    if(err) {
+      self.error(err, self._stat, args);
+    } else {
+      if(s.isDirectory()) {
+        self.dirs += 1;
+        self.enqueue(self._readdir, [p]);
+      } else {
+        self.files += 1;
+        self.bytes += s.size;
+      }
+    }
+    self.done();
+  });
+};
+
+// Runtime
+
+new Diskusage()
+  .on('error', function(err) {
+    console.log('error:', err);
+  })
+  .on('retry', function(func, args) {
+    console.log('retry:', args[0]);
+  })
+  .on('done', function() {
+    console.log('');
+    console.log('diskusage: %d bytes in %d dirs and %d files.', this.bytes, this.dirs, this.files);
+    console.log('           %d unreadable paths.', this.errors);
+  })
+.run('.');
+
+