module.exports.check_android = function()

in lib/check_reqs.js [137:247]
86 lines of code
28 McCabe index (conditional complexity)

module.exports.check_android = function () {
    return Promise.resolve().then(function () {
        let hasAndroidHome = false;

        function maybeSetAndroidHome (value) {
            if (!hasAndroidHome && fs.existsSync(value)) {
                hasAndroidHome = true;
                process.env.ANDROID_HOME = value;
            }
        }

        const adbInPath = forgivingWhichSync('adb');
        const avdmanagerInPath = forgivingWhichSync('avdmanager');

        if (process.env.ANDROID_HOME) {
            maybeSetAndroidHome(path.resolve(process.env.ANDROID_HOME));
        }

        // First ensure ANDROID_HOME is set
        // If we have no hints (nothing in PATH), try a few default locations
        if (!hasAndroidHome && !adbInPath && !avdmanagerInPath) {
            if (process.env.ANDROID_HOME) {
                // Fallback to deprecated `ANDROID_HOME` variable
                maybeSetAndroidHome(path.join(process.env.ANDROID_HOME));
            }
            if (module.exports.isWindows()) {
                // Android Studio 1.0 installer
                if (process.env.LOCALAPPDATA) {
                    maybeSetAndroidHome(path.join(process.env.LOCALAPPDATA, 'Android', 'sdk'));
                }
                if (process.env.ProgramFiles) {
                    maybeSetAndroidHome(path.join(process.env.ProgramFiles, 'Android', 'sdk'));
                }

                // Android Studio pre-1.0 installer
                if (process.env.LOCALAPPDATA) {
                    maybeSetAndroidHome(path.join(process.env.LOCALAPPDATA, 'Android', 'android-studio', 'sdk'));
                }
                if (process.env.ProgramFiles) {
                    maybeSetAndroidHome(path.join(process.env.ProgramFiles, 'Android', 'android-studio', 'sdk'));
                }

                // Stand-alone installer
                if (process.env.LOCALAPPDATA) {
                    maybeSetAndroidHome(path.join(process.env.LOCALAPPDATA, 'Android', 'android-sdk'));
                }
                if (process.env.ProgramFiles) {
                    maybeSetAndroidHome(path.join(process.env.ProgramFiles, 'Android', 'android-sdk'));
                }
            } else if (module.exports.isDarwin()) {
                // Android Studio 1.0 installer
                if (process.env.HOME) {
                    maybeSetAndroidHome(path.join(process.env.HOME, 'Library', 'Android', 'sdk'));
                }
                // Android Studio pre-1.0 installer
                maybeSetAndroidHome('/Applications/Android Studio.app/sdk');
                // Stand-alone zip file that user might think to put under /Applications
                maybeSetAndroidHome('/Applications/android-sdk-macosx');
                maybeSetAndroidHome('/Applications/android-sdk');
            }
            if (process.env.HOME) {
                // Stand-alone zip file that user might think to put under their home directory
                maybeSetAndroidHome(path.join(process.env.HOME, 'android-sdk-macosx'));
                maybeSetAndroidHome(path.join(process.env.HOME, 'android-sdk'));
            }
        }

        if (!hasAndroidHome) {
            // If we dont have ANDROID_HOME, but we do have some tools on the PATH, try to infer from the tooling PATH.
            let parentDir, grandParentDir;
            if (adbInPath) {
                parentDir = path.dirname(adbInPath);
                grandParentDir = path.dirname(parentDir);
                if (path.basename(parentDir) === 'platform-tools') {
                    maybeSetAndroidHome(grandParentDir);
                } else {
                    throw new CordovaError('Failed to find \'ANDROID_HOME\' environment variable. Try setting it manually.\n' +
                        'Detected \'adb\' command at ' + parentDir + ' but no \'platform-tools\' directory found near.\n' +
                        'Try reinstall Android SDK or update your PATH to include valid path to SDK' + path.sep + 'platform-tools directory.');
                }
            }
            if (avdmanagerInPath) {
                parentDir = path.dirname(avdmanagerInPath);
                grandParentDir = path.dirname(parentDir);
                if (path.basename(parentDir) === 'bin' && path.basename(grandParentDir) === 'tools') {
                    maybeSetAndroidHome(path.dirname(grandParentDir));
                } else {
                    throw new CordovaError('Failed to find \'ANDROID_HOME\' environment variable. Try setting it manually.\n' +
                        'Detected \'avdmanager\' command at ' + parentDir + ' but no \'tools' + path.sep + 'bin\' directory found near.\n' +
                        'Try reinstall Android SDK or update your PATH to include valid path to SDK' + path.sep + 'tools' + path.sep + 'bin directory.');
                }
            }
        }
        if (!process.env.ANDROID_HOME) {
            throw new CordovaError('Failed to find \'ANDROID_HOME\' environment variable. Try setting it manually.\n' +
                'Failed to find \'android\' command in your \'PATH\'. Try update your \'PATH\' to include path to valid SDK directory.');
        }
        if (!fs.existsSync(process.env.ANDROID_HOME)) {
            throw new CordovaError('\'ANDROID_HOME\' environment variable is set to non-existent path: ' + process.env.ANDROID_HOME +
                '\nTry update it manually to point to valid SDK directory.');
        }
        // Next let's make sure relevant parts of the SDK tooling is in our PATH
        if (hasAndroidHome && !adbInPath) {
            process.env.PATH += path.delimiter + path.join(process.env.ANDROID_HOME, 'platform-tools');
        }
        if (hasAndroidHome && !avdmanagerInPath) {
            process.env.PATH += path.delimiter + path.join(process.env.ANDROID_HOME, 'tools', 'bin');
        }
        return hasAndroidHome;
    });
};