Do not print logs if print command is used.

lib/Serverless.js

@@ -81,6 +81,7 @@ class Serverless {
     if (this.cli.displayHelp(this.processedInput)) {
       return BbPromise.resolve();
     }
+    this.cli.suppressLogIfPrintCommand(this.processedInput);
 
     // make sure the command exists before doing anything else
     this.pluginManager.validateCommand(this.processedInput.commands);

lib/classes/CLI.js

@@ -79,6 +79,30 @@ class CLI {
     return { commands, options };
   }
 
+  suppressLogIfPrintCommand(processedInput) {
+    const commands = processedInput.commands;
+    const options = processedInput.options;
+
+    // if "-help" or "-h" was entered
+    if (options.help || options.h) {
+      return;
+    }
+
+    // if "print" was NOT entered
+    if (commands.indexOf('print') === -1) {
+      return;
+    }
+
+    // if other command was combined with "print"
+    if (commands.length !== 1) {
+      return;
+    }
+
+    // Make "log" no-op to suppress warnings.
+    // But preserve "consoleLog" which "print" command use to print config.
+    this.log = function () {};
+  }
+
   displayHelp(processedInput) {
     const commands = processedInput.commands;
     const options = processedInput.options;

lib/classes/CLI.test.js

@@ -72,6 +72,86 @@ describe('CLI', () => {
     });
   });
 
+  describe('#suppressLogIfPrintCommand()', () => {
+    let logStub;
+    let consoleLogStub;
+
+    beforeEach(() => {
+      logStub = sinon.stub();
+      consoleLogStub = sinon.stub();
+    });
+
+    it('should do nothing when no command is given', () => {
+      cli = new CLI(serverless, []);
+      cli.log = logStub;
+      cli.consoleLog = consoleLogStub;
+
+      const processedInput = cli.processInput();
+      cli.suppressLogIfPrintCommand(processedInput);
+      cli.log('logged');
+      cli.consoleLog('logged');
+
+      expect(logStub.calledOnce).to.equal(true);
+      expect(consoleLogStub.calledOnce).to.equal(true);
+    });
+
+    it('should do nothing when "print" is given with "-h"', () => {
+      cli = new CLI(serverless, ['print', '-h']);
+      cli.log = logStub;
+      cli.consoleLog = consoleLogStub;
+
+      const processedInput = cli.processInput();
+      cli.suppressLogIfPrintCommand(processedInput);
+      cli.log('logged');
+      cli.consoleLog('logged');
+
+      expect(logStub.calledOnce).to.equal(true);
+      expect(consoleLogStub.calledOnce).to.equal(true);
+    });
+
+    it('should do nothing when "print" is given with "-help"', () => {
+      cli = new CLI(serverless, ['print', '-help']);
+      cli.log = logStub;
+      cli.consoleLog = consoleLogStub;
+
+      const processedInput = cli.processInput();
+      cli.suppressLogIfPrintCommand(processedInput);
+      cli.log('logged');
+      cli.consoleLog('logged');
+
+      expect(logStub.calledOnce).to.equal(true);
+      expect(consoleLogStub.calledOnce).to.equal(true);
+    });
+
+    it('should do nothing when "print" is combined with other command.', () => {
+      cli = new CLI(serverless, ['other', 'print']);
+      cli.log = logStub;
+      cli.consoleLog = consoleLogStub;
+
+      const processedInput = cli.processInput();
+      cli.suppressLogIfPrintCommand(processedInput);
+      cli.log('logged');
+      cli.consoleLog('logged');
+
+      expect(logStub.calledOnce).to.equal(true);
+      expect(consoleLogStub.calledOnce).to.equal(true);
+    });
+
+    it('should suppress log when "print" is given', () => {
+      cli = new CLI(serverless, ['print', '-myvar', '123']);
+      cli.log = logStub;
+      cli.consoleLog = consoleLogStub;
+
+      const processedInput = cli.processInput();
+      cli.suppressLogIfPrintCommand(processedInput);
+      cli.log('NOT LOGGED');
+      cli.consoleLog('logged');
+
+      expect(logStub.calledOnce).to.equal(false);
+      expect(consoleLogStub.calledOnce).to.equal(true);
+    });
+  });
+
   describe('#displayHelp()', () => {
     it('should return true when no command is given', () => {
       cli = new CLI(serverless, []);