Github user agrieve commented on a diff in the pull request:
https://github.com/apache/cordova-lib/pull/170#discussion_r25629266
--- Diff: cordova-lib/src/cordova/platform_metadata.js ---
@@ -0,0 +1,102 @@
+/**
+ Licensed to the Apache Software Foundation (ASF) under one
+ or more contributor license agreements. See the NOTICE file
+ distributed with this work for additional information
+ regarding copyright ownership. The ASF licenses this file
+ to you under the Apache License, Version 2.0 (the
+ "License"); you may not use this file except in compliance
+ with the License. You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing,
+ software distributed under the License is distributed on an
+ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ KIND, either express or implied. See the License for the
+ specific language governing permissions and limitations
+ under the License.
+*/
+
+
+var path = require('path'),
+ cordova_util = require('./util'),
+ fs = require('fs'),
+ Q = require('q'),
+ shelljs = require('shelljs');
+
+
+// Retrieves the platforms and their versions from the platforms.json file
+// Returns an array of {platform: platform, version: version} ...
+// ... where version could be '3.4.0', '/path/to/platform' or 'git://...'
+function getVersions(projectRoot) {
+ var platformsDir = path.join(projectRoot, 'platforms');
+ var platformsJsonFile = path.join(platformsDir, 'platforms.json');
+
+ // If the platforms.json file doesn't exist, retrieve versions from
platforms installed on the filesystem...
+ // ...Note that in this case, we won't be able to know what
source(folder, git-url) the platform came from, we'll just use versions
+ return getPlatVersionsFromFile(platformsJsonFile).fail(function(){
+ return getPlatVersionsFromFileSystem(projectRoot);
+ });
+}
+
+// Returns a promise
+function getPlatVersionsFromFile(platformsJsonFile){
+ var platformData = require(platformsJsonFile);
+ var platformVersions = [];
+
+ platformVersions = Object.keys(platformData).map(function(p){
+ return {platform: p, version: platformData[p]};
+ });
+
+ return Q(platformVersions);
+}
+
+// Returns a promise
+function getPlatVersionsFromFileSystem(projectRoot){
+ var platformVersions = [];
+ var platforms_on_fs = cordova_util.listPlatforms(projectRoot);
+ platforms_on_fs.forEach(function(platform){
+ var script = path.join(projectRoot, 'platforms', platform,
'cordova', 'version');
+
+ // Use version script to retrieve installed version of the platform
+ var version = shelljs.exec(script).output;
+
+ // clean the version we get back from the script
+ // This is necessary because the version script uses console.log
to pass back
+ // the version. Using console.log ends up adding additional line
breaks/newlines to the value returned.
+ // ToDO: version scripts should be refactored to not use
console.log()
+ var versionCleaned = version.replace(/\r?\n|\r/g, '');
+ platformVersions.push({platform: platform, version:
versionCleaned});
+ });
+
+ return Q(platformVersions);
+}
+
+// Saves platform@version into platforms.json
+function save(projectRoot, platform, version) {
+ var platformsDir = path.join(projectRoot, 'platforms');
+ var platformJsonFile = path.join(platformsDir, 'platforms.json');
+ if(!fs.existsSync(platformJsonFile)){
+ fs.writeFileSync(platformJsonFile, JSON.stringify({}, null, 4),
'utf-8');
--- End diff --
writing to a non-existing file should work fine. do you mean read from it?
You're already checking if it exists, so you might as well:
var data = {}
if (exists) {
data = getJson();
}
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