83 lines
2.4 KiB
JavaScript
83 lines
2.4 KiB
JavaScript
/*
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** © 2020 by Philipp Dunkel, Ben Noordhuis, Elan Shankar, Paul Miller
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** Licensed under MIT License.
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*/
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/* jshint node:true */
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"use strict";
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if (process.platform !== "darwin") {
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throw new Error(`Module 'fsevents' is not compatible with platform '${process.platform}'`);
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}
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const Native = require("./fsevents.node");
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const events = Native.constants;
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function watch(path, since, handler) {
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if (typeof path !== "string") {
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throw new TypeError(`fsevents argument 1 must be a string and not a ${typeof path}`);
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}
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if ("function" === typeof since && "undefined" === typeof handler) {
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handler = since;
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since = Native.flags.SinceNow;
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}
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if (typeof since !== "number") {
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throw new TypeError(`fsevents argument 2 must be a number and not a ${typeof since}`);
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}
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if (typeof handler !== "function") {
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throw new TypeError(`fsevents argument 3 must be a function and not a ${typeof handler}`);
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}
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let instance = Native.start(Native.global, path, since, handler);
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if (!instance) throw new Error(`could not watch: ${path}`);
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return () => {
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const result = instance ? Promise.resolve(instance).then(Native.stop) : Promise.resolve(undefined);
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instance = undefined;
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return result;
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};
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}
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function getInfo(path, flags) {
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return {
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path,
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flags,
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event: getEventType(flags),
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type: getFileType(flags),
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changes: getFileChanges(flags),
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};
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}
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function getFileType(flags) {
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if (events.ItemIsFile & flags) return "file";
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if (events.ItemIsDir & flags) return "directory";
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if (events.MustScanSubDirs & flags) return "directory";
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if (events.ItemIsSymlink & flags) return "symlink";
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}
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function anyIsTrue(obj) {
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for (let key in obj) {
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if (obj[key]) return true;
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}
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return false;
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}
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function getEventType(flags) {
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if (events.ItemRemoved & flags) return "deleted";
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if (events.ItemRenamed & flags) return "moved";
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if (events.ItemCreated & flags) return "created";
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if (events.ItemModified & flags) return "modified";
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if (events.RootChanged & flags) return "root-changed";
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if (events.ItemCloned & flags) return "cloned";
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if (anyIsTrue(flags)) return "modified";
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return "unknown";
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}
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function getFileChanges(flags) {
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return {
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inode: !!(events.ItemInodeMetaMod & flags),
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finder: !!(events.ItemFinderInfoMod & flags),
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access: !!(events.ItemChangeOwner & flags),
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xattrs: !!(events.ItemXattrMod & flags),
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};
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}
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exports.watch = watch;
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exports.getInfo = getInfo;
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exports.constants = events;
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