79 lines
2.8 KiB
JavaScript
79 lines
2.8 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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const { Ci } = require("chrome");
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const Services = require("Services");
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const EventEmitter = require("devtools/shared/event-emitter");
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loader.lazyImporter(this, "OS", "resource://gre/modules/osfile.jsm");
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const HOTRELOAD_PREF = "devtools.loader.hotreload";
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function resolveResourcePath(uri) {
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const handler = Services.io.getProtocolHandler("resource")
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.QueryInterface(Ci.nsIResProtocolHandler);
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const resolved = handler.resolveURI(Services.io.newURI(uri, null, null));
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return resolved.replace(/file:\/\//, "");
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}
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function findSourceDir(path) {
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if (path === "" || path === "/") {
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return Promise.resolve(null);
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}
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return OS.File.exists(
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OS.Path.join(path, "devtools/client/shared/file-watcher.js")
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).then(exists => {
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if (exists) {
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return path;
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}
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return findSourceDir(OS.Path.dirname(path));
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});
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}
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let worker = null;
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const onPrefChange = function () {
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// We need to figure out a src dir to watch. These are the actual
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// files the user is working with, not the files in the obj dir. We
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// do this by walking up the filesystem and looking for the devtools
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// directories, and falling back to the raw path. This means none of
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// this will work for users who store their obj dirs outside of the
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// src dir.
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//
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// We take care not to mess with the `devtoolsPath` if that's what
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// we end up using, because it might be intentionally mapped to a
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// specific place on the filesystem for loading devtools externally.
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//
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// `devtoolsPath` is currently the devtools directory inside of the
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// obj dir, and we search for `devtools/client`, so go up 2 levels
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// to skip that devtools dir and start searching for the src dir.
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if (Services.prefs.getBoolPref(HOTRELOAD_PREF) && !worker) {
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const devtoolsPath = resolveResourcePath("resource://devtools")
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.replace(/\/$/, "");
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const searchPoint = OS.Path.dirname(OS.Path.dirname(devtoolsPath));
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findSourceDir(searchPoint)
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.then(srcPath => {
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const rootPath = srcPath ? OS.Path.join(srcPath, "devtools")
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: devtoolsPath;
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const watchPath = OS.Path.join(rootPath, "client");
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const { watchFiles } = require("devtools/client/shared/file-watcher");
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worker = watchFiles(watchPath, path => {
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let relativePath = path.replace(rootPath + "/", "");
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module.exports.emit("file-changed", relativePath, path);
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});
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});
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} else if (worker) {
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worker.terminate();
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worker = null;
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}
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};
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Services.prefs.addObserver(HOTRELOAD_PREF, {
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observe: onPrefChange
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}, false);
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onPrefChange();
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EventEmitter.decorate(module.exports);
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