mirror of
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74 lines
2.5 KiB
JavaScript
74 lines
2.5 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, ChromeWorker } = require("chrome");
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const { Services } = require("resource://gre/modules/Services.jsm");
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const EventEmitter = require("devtools/shared/event-emitter");
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const HOTRELOAD_PREF = "devtools.loader.hotreload";
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function resolveResourceURI(uri) {
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const handler = Services.io.getProtocolHandler("resource")
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.QueryInterface(Ci.nsIResProtocolHandler);
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return handler.resolveURI(Services.io.newURI(uri, null, null));
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}
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function watchFiles(path, onFileChanged) {
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if (!path.startsWith("devtools/")) {
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throw new Error("`watchFiles` expects a devtools path");
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}
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// We need to figure out a local path to watch. We start with
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// whatever devtools points to.
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let resolvedRootURI = resolveResourceURI("resource://devtools");
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if (resolvedRootURI.match(/\/obj\-.*/)) {
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// Move from the built directory to the user's local files
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resolvedRootURI = resolvedRootURI.replace(/\/obj\-.*/, "") + "/devtools";
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}
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resolvedRootURI = resolvedRootURI.replace(/^file:\/\//, "");
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const localURI = resolvedRootURI + "/" + path.replace(/^devtools\//, "");
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const watchWorker = new ChromeWorker(
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"resource://devtools/client/shared/file-watcher-worker.js"
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);
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watchWorker.onmessage = event => {
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// We need to turn a local path back into a resource URI (or
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// chrome). This means that this system will only work when built
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// files are symlinked, so that these URIs actually read from
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// local sources. There might be a better way to do this.
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const relativePath = event.data.replace(resolvedRootURI + "/", "");
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if (relativePath.startsWith("client/themes")) {
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onFileChanged(relativePath.replace("client/themes",
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"chrome://devtools/skin"));
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}
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onFileChanged("resource://devtools/" + relativePath);
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};
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watchWorker.postMessage({ path: localURI, fileRegex: /\.(js|css)$/ });
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return watchWorker;
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}
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EventEmitter.decorate(module.exports);
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let watchWorker;
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function onPrefChange() {
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if (Services.prefs.getBoolPref(HOTRELOAD_PREF) && !watchWorker) {
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watchWorker = watchFiles("devtools/client", changedFile => {
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module.exports.emit("file-changed", changedFile);
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});
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}
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else if(watchWorker) {
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watchWorker.terminate();
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watchWorker = 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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