Add API for custom handling of deprecations

Author: maxbrunsfeld

atom/common/api/lib/deprecate.js

@@ -88,9 +88,13 @@ deprecate.warn = function(oldName, newName) {
   return deprecate.log(oldName + " is deprecated. Use " + newName + " instead.");
 };
 
+var deprecationHandler = null;
+
 // Print deprecation message.
 deprecate.log = function(message) {
-  if (process.throwDeprecation) {
+  if (typeof deprecationHandler === 'function') {
+    deprecationHandler(message);
+  } else if (process.throwDeprecation) {
     throw new Error(message);
   } else if (process.traceDeprecation) {
     return console.trace(message);
@@ -99,4 +103,12 @@ deprecate.log = function(message) {
   }
 };
 
+deprecate.setHandler = function(handler) {
+  deprecationHandler = handler;
+};
+
+deprecate.getHandler = function() {
+  return deprecationHandler;
+}
+
 module.exports = deprecate;

atom/common/api/lib/deprecations.js

@@ -0,0 +1,11 @@
+'use strict';
+
+const deprecate = require('electron').deprecate;
+
+exports.setHandler = function (deprecationHandler) {
+  deprecate.setHandler(deprecationHandler);
+};
+
+exports.getHandler = function () {
+  return deprecate.getHandler();
+}

atom/common/api/lib/exports/electron.js

@@ -31,6 +31,12 @@ exports.defineProperties = function(exports) {
         return require('../crash-reporter');
       }
     },
+    deprecations: {
+      enumerable: true,
+      get: function() {
+        return require('../deprecations');
+      }
+    },
     nativeImage: {
       enumerable: true,
       get: function() {

filenames.gypi

@@ -41,6 +41,7 @@
       'atom/common/api/lib/clipboard.js',
       'atom/common/api/lib/crash-reporter.js',
       'atom/common/api/lib/deprecate.js',
+      'atom/common/api/lib/deprecations.js',
       'atom/common/api/lib/exports/electron.js',
       'atom/common/api/lib/native-image.js',
       'atom/common/api/lib/shell.js',

spec/api-deprecations-spec.js

@@ -0,0 +1,27 @@
+const assert = require('assert');
+const deprecations = require('electron').deprecations;
+
+describe('deprecations', function() {
+  beforeEach(function() {
+    deprecations.setHandler(null);
+    process.throwDeprecation = true;
+  });
+
+  it('allows a deprecation handler function to be specified', function() {
+    var messages = [];
+
+    deprecations.setHandler(function (message) {
+      messages.push(message)
+    });
+
+    require('electron').webFrame.registerUrlSchemeAsSecure('some-scheme')
+
+    assert.deepEqual(messages, ['registerUrlSchemeAsSecure is deprecated. Use registerURLSchemeAsSecure instead.']);
+  });
+
+  it('throws an exception if no deprecation handler is specified', function() {
+    assert.throws(function() {
+      require('electron').webFrame.registerUrlSchemeAsPrivileged('some-scheme')
+    }, "registerUrlSchemeAsPrivileged is deprecated. Use registerURLSchemeAsPrivileged instead.");
+  });
+})