Generate taiko api calls from the REPL

[zabil]

After implementing #2
Provide an option in the REPL to convert the sequence of REPL commands to taiko compatible API.

For e.g.

$ taiko
>> openBrowser
>> goto http://getgauge.io
>> click Get Started
>> .copy

should copy the following to clipboard

(async => {
 await openBrowser();
 await goto("http://getauge.io");
 await click("Get Started");
})();

[zabil]

This is now changed to

$ taiko
>> openBrowser()
undefined
>> goto("https://getgauge.io")
undefined
>> click("Get Started")
undefined
>> closeBrowser()
undefined
>> .code
const { browser, page, openBrowser, closeBrowser, goto, reload, $, $$, link, listItem, inputField, textField, 
image, button, comboBox, checkBox, radioButton, alert, prompt, confirm, beforeunload, text, contains, click,
 doubleClick, rightClick, write, press, upload, highlight, focus, scrollTo, scrollRight, scrollLeft, scrollUp, 
scrollDown, hover, screenshot, timeoutSecs, intervalSecs, waitForNavigation, to, into } = require('taiko');

(async => {
    await openBrowser({headless: false});
    await goto("https://getgauge.io");
    await click("Get Started");
    await closeBrowser();
})();
>>

[zabil]

Modify the .code to take a filename

>> .code file.js

will save the code to a file

[BugDiver]

The command .code should capture only successful commands.

Example :

➜  ~ taiko
>> openBrowser()
undefined
>> goto()
Error: Protocol error (Page.navigate): Invalid parameters url: string value expected
    at Session._onMessage (/usr/local/lib/node_modules/taiko/node_modules/puppeteer/lib/Connection.js:194:25)
    at Connection._onMessage (/usr/local/lib/node_modules/taiko/node_modules/puppeteer/lib/Connection.js:98:19)
    at emitOne (events.js:115:13)
    at WebSocket.emit (events.js:210:7)
    at Receiver._receiver.onmessage 
>> goto("https://getgauge.io")
undefined
>> .code
const { browser, page, openBrowser, closeBrowser, goto, reload, $, $$, link, listItem, inputField, textField, image, button, comboBox, checkBox, radioButton, alert, prompt, confirm, beforeunload, text, contains, click, doubleClick, rightClick, write, press, upload, highlight, focus, scrollTo, scrollRight, scrollLeft, scrollUp, scrollDown, hover, screenshot, timeoutSecs, intervalSecs, waitForNavigation, to, into } = require('taiko');

(async => {
	openBrowser();
	goto();
	goto("https://getgauge.io");
})();
>>

In above example, .code should not capture goto() action

[kashishm]

Implemented.