From 4e5a2bc0791a77ac67c2b564a220278bea889fcf Mon Sep 17 00:00:00 2001
From: Martin Konicek <mkonicek@fb.com>
Date: Tue, 27 Oct 2015 11:19:38 -0700
Subject: [PATCH] Introduce react-native link

Reviewed By: martinbigio

Differential Revision: D2575858

fb-gh-sync-id: 13be5a0411db5cd753ebbac3799a7a0139c0f952
---
 local-cli/cli.js          |   2 +
 local-cli/library/link.js | 137 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 139 insertions(+)
 create mode 100644 local-cli/library/link.js

diff --git a/local-cli/cli.js b/local-cli/cli.js
index 5fa142711..b7091876f 100644
--- a/local-cli/cli.js
+++ b/local-cli/cli.js
@@ -21,6 +21,7 @@ var dependencies = require('./dependencies/dependencies');
 var fs = require('fs');
 var generate = require('./generate/generate');
 var library = require('./library/library');
+var link = require('./library/link');
 var path = require('path');
 var Promise = require('promise');
 var runAndroid = require('./runAndroid/runAndroid');
@@ -40,6 +41,7 @@ var documentedCommands = {
   'start': [server, 'starts the webserver'],
   'bundle': [bundle, 'builds the javascript bundle for offline use'],
   'new-library': [library, 'generates a native library bridge'],
+  'link': [link, 'Adds a third-party library to your project. Example: react-native link awesome-camera'],
   'android': [generateWrapper, 'generates an Android project for your app'],
   'run-android': [runAndroid, 'builds your app and starts it on a connected Android emulator or device'],
   'upgrade': [upgrade, 'upgrade your app\'s template files to the latest version; run this after ' +
diff --git a/local-cli/library/link.js b/local-cli/library/link.js
new file mode 100644
index 000000000..86efb174b
--- /dev/null
+++ b/local-cli/library/link.js
@@ -0,0 +1,137 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+'use strict';
+
+const execSync = require('child_process').execSync;
+const eol = require('os').EOL;
+const fs = require('fs');
+const Promise = require('promise');
+
+/**
+ * Adds a third-party library to the current project.
+ *
+ * Usage:
+ * react-native link awesome-camera
+ * react-native link awesome-camera@0.2.0
+ *
+ * Does the following:
+ *   npm install --save awesome-camera
+ *   If the library contains native Android code, adds it to the build.
+ */
+function link(argv, config) {
+  return new Promise((resolve, reject) => {
+    try {
+      _link(argv, config);
+    } catch (e) {
+      reject(e);
+      return;
+    }
+    resolve();
+  });
+}
+
+function _link(argv, config) {
+  // argv examples:
+  // ['link', 'awesome-camera']
+  // ['link', 'awesome-camera@0.2']
+  if (argv.length !== 2) {
+    throw 'Please provide one argument (library to install).\n' +
+        'Usage example: react-native link awesome-camera';
+  }
+
+  const libraryAndVersion = argv[1];
+  const library = libraryAndVersion.split('@')[0];
+
+  _npmInstall(libraryAndVersion);
+  _maybeLinkAndroid(library);
+}
+
+function _npmInstall(library) {
+  const command = 'npm install --save ' + library;
+  console.log('Running ' + command);
+  try {
+    execSync(command);
+  } catch (e) {
+    throw command + ' failed';
+  }
+}
+
+/**
+ * If this library contains Android native code, add it to the build.
+ */
+function _maybeLinkAndroid(library) {
+  if (!_pathExists(`node_modules/${library}/android`)) {
+    return;
+  }
+  if (
+    (!_pathExists('android/settings.gradle')) ||
+    (!_pathExists('android/app/build.gradle'))) {
+    console.log('The library contains native Android code but this is not an ' +
+        'Android project, skipping.'
+    );
+    return;
+  }
+  if (!_pathExists(`node_modules/${library}/android/build.gradle`)) {
+    console.log('Looks like the Android library has incorrect format: ' +
+        'android/build.gradle is missing.'
+    );
+    return;
+  }
+
+  // Update settings.gradle
+  if (fs.readFileSync('android/settings.gradle', 'utf8').indexOf(`include ':${library}'`) !== -1) {
+    console.log('The library is already present in android/settings.gradle.');
+  } else {
+    fs.appendFileSync('android/settings.gradle',
+      `${eol}// ${library} dependency${eol}` +
+      `include ':${library}'${eol}` +
+      `project(':${library}').projectDir = ` +
+          `new File(rootProject.projectDir, '../node_modules/${library}/android')${eol}`
+    );
+    console.log('Updated android/settings.gradle');
+  }
+
+  // Update android/app/build.gradle
+  const build = fs.readFileSync('android/app/build.gradle', 'utf8');
+  if (build.indexOf(`compile project(":${library}")`) !== -1) {
+    console.log('The library is already present in android/app/build.gradle.');
+  } else {
+    const append = (
+      // Include sources
+      `    compile project(":${library}")${eol}` +
+      // Include libs/*.jar
+      `    compile fileTree(dir: "node_modules/${library}/android/libs", include: ["*.jar"])`
+    );
+    const buildWithDeps = build.replace(
+      /dependencies {([^}]*)}/g,
+      `dependencies {$1${eol}${append}${eol}}`
+    );
+    fs.writeFileSync('android/app/build.gradle', buildWithDeps, 'utf8');
+    console.log('Updated android/app/build.gradle');
+  }
+  // We could try to automate this as well.
+  // E.g. by convention the package name would end with Package.java.
+  console.log('Next step: add the library to your MainActivity.java by calling addPackage().\n' +
+    `Look for the package name in node_modules/${library}/android/src/main/java`
+  );
+}
+
+function _pathExists(path) {
+  try {
+    const stats = fs.statSync(path);
+    return stats.isFile() || stats.isDirectory();
+  } catch (e) {
+    if (e.code === 'ENOENT') {
+      return false;
+    }
+    throw e;
+  }
+}
+
+module.exports = link;