Initial pass

node_modules/sane/src/poll_watcher.js

@@ -0,0 +1,117 @@
+'use strict';
+
+const fs = require('fs');
+const path = require('path');
+const watch = require('@cnakazawa/watch');
+const common = require('./common');
+const EventEmitter = require('events').EventEmitter;
+
+/**
+ * Constants
+ */
+
+const DEFAULT_DELAY = common.DEFAULT_DELAY;
+const CHANGE_EVENT = common.CHANGE_EVENT;
+const DELETE_EVENT = common.DELETE_EVENT;
+const ADD_EVENT = common.ADD_EVENT;
+const ALL_EVENT = common.ALL_EVENT;
+
+/**
+ * Export `PollWatcher` class.
+ * Watches `dir`.
+ *
+ * @class PollWatcher
+ * @param String dir
+ * @param {Object} opts
+ * @public
+ */
+
+module.exports = class PollWatcher extends EventEmitter {
+  constructor(dir, opts) {
+    super();
+
+    opts = common.assignOptions(this, opts);
+
+    this.watched = Object.create(null);
+    this.root = path.resolve(dir);
+
+    watch.createMonitor(
+      this.root,
+      {
+        interval: (opts.interval || DEFAULT_DELAY) / 1000,
+        filter: this.filter.bind(this),
+      },
+      this.init.bind(this)
+    );
+  }
+
+  /**
+   * Given a fullpath of a file or directory check if we need to watch it.
+   *
+   * @param {string} filepath
+   * @param {object} stat
+   * @private
+   */
+
+  filter(filepath, stat) {
+    return (
+      stat.isDirectory() ||
+      common.isFileIncluded(
+        this.globs,
+        this.dot,
+        this.doIgnore,
+        path.relative(this.root, filepath)
+      )
+    );
+  }
+
+  /**
+   * Initiate the polling file watcher with the event emitter passed from
+   * `watch.watchTree`.
+   *
+   * @param {EventEmitter} monitor
+   * @public
+   */
+
+  init(monitor) {
+    this.watched = monitor.files;
+    monitor.on('changed', this.emitEvent.bind(this, CHANGE_EVENT));
+    monitor.on('removed', this.emitEvent.bind(this, DELETE_EVENT));
+    monitor.on('created', this.emitEvent.bind(this, ADD_EVENT));
+    // 1 second wait because mtime is second-based.
+    setTimeout(this.emit.bind(this, 'ready'), 1000);
+  }
+
+  /**
+   * Transform and emit an event comming from the poller.
+   *
+   * @param {EventEmitter} monitor
+   * @public
+   */
+
+  emitEvent(type, file, stat) {
+    file = path.relative(this.root, file);
+
+    if (type === DELETE_EVENT) {
+      // Matching the non-polling API
+      stat = null;
+    }
+
+    this.emit(type, file, this.root, stat);
+    this.emit(ALL_EVENT, type, file, this.root, stat);
+  }
+
+  /**
+   * End watching.
+   *
+   * @public
+   */
+
+  close(callback) {
+    Object.keys(this.watched).forEach(filepath => fs.unwatchFile(filepath));
+    this.removeAllListeners();
+    if (typeof callback === 'function') {
+      setImmediate(callback.bind(null, null, true));
+    }
+  }
+};