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OK, so we left off a boat here.



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Let me get over to our code.



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What I want to do this time around is three things.



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First of all, I want to enable go modules which will be using fairly extensively through the remainder



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of this course.



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Secondly, I want to rearrange things again to support go modules to make it easier to support go modules.



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And thirdly, I want to use templates from a layout and pass data to them.



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OK, so those are the things we're going to try to accomplish in this lecture.



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And fortunately, none of it is that difficult.



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So I'm going to go to my terminal and I am going to stop my application.



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If I have it running, I'm going to make sure I'm in the root level of my directory and I am minus called



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Hello World.



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And now I'm going to enable go modules and go modules is basically package management for go.



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So it's like using composer in for example, it allows us to easily use external third party packages



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that have pre-built functionality that we want to use so we don't have to reinvent the wheel.



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So doing that is pretty simple.



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I'm in the root level of my module and I'm going to say go mud in it and then I need to give it a name.



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And conventionally, the name of your package or your application should correspond to where it exists



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in a git repository repository somewhere.



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So I'm going to use GitHub, even though this repository might not exist, GitHub, dotcom, and then



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I'm going to use my first my name or whatever my GitHub username is T Sollar.



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And then I'm going to name my package, which I'll just call go course.



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And when I do that.



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It creates a new module, and if I look up in my directory where all my files are, it's created a new



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file called Go Dormant.



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And if I open that, it's just a text file and all it does is name this module, GitHub, Dotcom, TESOL,



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Argo, dash course.



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And it tells me I'm using go version one point one five.



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You might have a different version there.



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It might be later when you take this course, we might be able to go to who knows, but it doesn't matter.



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That's what that file is going to be.



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Now, this is a file that we very rarely will ever edit by hand.



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There are situations where you're going to, but not always.



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Now, you'll notice in my Ebeid, I got a little warning here in the lower right hand corner that says



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go module is detected.



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Module path is then examine the past of the module, enable integration.



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Yes, I'm going to enable the integration.



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So I'm going to click enable integration.



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Check this box that says enable it and click OK.



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And it's done.



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Gopalnath indexing is disabled.



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That's fine.



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I don't care about that.



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I'm using good modules.



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This is the way that module that go programming is done these days.



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Using the modules, you'll find all kinds of tutorials online that tell you the old way of doing it



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by setting your gopalnath variable and all that.



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But we're going to use modules because that's the way it is done now.



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All right.



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So that was easy.



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So I've created a module.



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Now I want to do something else.



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I want to refactor my code, rearrange where it exists so that it makes a little more sense.



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And I'm going to do that, first of all, by going to my hello world directory at the root level of



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my application and creating a new directory.



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And I'm going to call that CMD for command.



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Inside of that, I'm going to create another new directory called WEAP.



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Now, this is kind of conventional.



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This is typically where Web applications often have their main function.



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So what I'm going to do is move my main function over into the command web.



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And it asked me, do I want to move that?



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Yes, I do want to refactor that so it moves it.



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So that's great.



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But immediately I see I have an error and the error is one that's pretty straightforward to understand.



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I have mango.



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If I open that it says I can't find home and I can't find a boat.



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That's because these handlers are no longer part of the main package.



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They say that they're they say package mean, but packages always live in their own directory.



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So what I'm going to do is move handlers to its own package.



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So I'm going to go back to my top level of my application and create a new directory.



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And I'm going to call that pkg for packages.



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That's where I'm going to put all the packages that I build from my application.



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And we'll have a few by the time we're done here.



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Inside of that, I'll create another new folder called Handlers.



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Then I will move my handlers into the handlers directory.



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And this I'd asked me, do you want to move it?



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And I say, yes, I do want to refactor it.



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So it moves them in there.



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And I look inside package and I have yet more errors.



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This seems to be getting worse instead of better.



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Well, the error is, again, it can't find the render template package or function because it's not



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part of this package.



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But you notice what I moved it in at refactored.



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My application is Handler's file to say it's now using the package handlers.



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Wow.



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OK, how come I can't find my render?



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Well, let's create another package, a new package or new directorate called Prender.



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Great.



89

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So I've got a new directory called Render.



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Now I will move my render package into or render file into this render package.



91

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And yes, I want to refactor it.



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So when I reopen it, it says, hey, you've got this a file and now it's part of the render package.



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Remember, all the files for a package must exist in the same directory.



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So you think about it.



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My main package is now in a folder called WEAP.



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I can call that whatever I wanted to, but this is a Web application, so I call it Web and that is



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package.



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Main Handler's package has one file in it called package handlers and the render template.



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The the things that were into the templates they're in a package called Renders.



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When I open it, its package is render.



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Now, you may recall a while ago I said that when you have a function in a package and the function



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name begins with a lowercase letter, that is a private function, you can only call that function from



103

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within the package.



104

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Well, inside the render package, I have a function called render template, which I'm using inside



105

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templates inside my handlers to actually render templates.



106

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But this begins with a lowercase letter, so let's rename it with an uppercase letter.



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Now it's visible.



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I can see it now.



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I'm going to put a comment in there like you're supposed to renders templates using HTML template,



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which I better spell.



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Right.



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So now this is visible.



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It means I can see it from within my handlers or any other package in my application, but I'm.



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To it here, not using a package name and with a lower case.



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So let's just change that.



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Let's go to render template and notice my I.D. said, hey, you want to use the render template package



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from the render the render template functions from the render package.



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That's the one I want.



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So it automatically imparts it and notice what it imported.



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It didn't didn't just say render it said GitHub, Dotcom, TESOL or Godus of course package render.



121

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So it's the full path name according to go module's to that package and now I can use it.



122

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I need to do the same thing for this function rendered template.



123

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I'm here now.



124

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I have no errors in this one, no errors in this one, no errors in this one.



125

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But I still have errors in May.



126

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Don't go.



127

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Why?



128

00:07:26,590 --> 00:07:30,700

Because again, I'm calling the home package and I actually can't.



129

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The home function, which doesn't exist anywhere in the main package.



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So instead I need to go to handlers and which this one's for home.



131

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Home there.



132

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And if I get rid of these parentheses, then life is good.



133

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I'm calling that actual handler, which now exists in his own package.



134

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And I can do the same thing here.



135

00:07:52,900 --> 00:07:59,530

Handlers dot about, OK, so that is actually all right now.



136

00:07:59,530 --> 00:08:02,320

So I have everything organized into their own packages.



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I have handlers that are just it's just going to consist of handlers for whatever pages our application



138

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might have, might have.



139

00:08:08,800 --> 00:08:14,050

I have the render that does nothing more than render templates and I have the main function which just



140

00:08:14,050 --> 00:08:18,910

calls those handlers and listens to the starts up a Web server that listens for connections.



141

00:08:19,180 --> 00:08:24,490

Let's try running this now because I mean the root level of my directory, which you can see again,



142

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I'm right here, users TC's Visual Studio Projects.



143

00:08:27,190 --> 00:08:27,850

Hello World.



144

00:08:28,660 --> 00:08:30,310

I can't go, go, run.



145

00:08:30,310 --> 00:08:31,150

StarTalk, go.



146

00:08:31,150 --> 00:08:33,220

Because there's no go files at this level.



147

00:08:33,400 --> 00:08:38,740

I actually need to change this to say go run command Web site Targo.



148

00:08:38,770 --> 00:08:42,160

And you might be asking yourself, what about all those files in the packages?



149

00:08:42,160 --> 00:08:43,400

How does it know where they are?



150

00:08:43,450 --> 00:08:45,370

Well, it knows because of the imports.



151

00:08:45,730 --> 00:08:50,350

So when I actually compile those files, only the only ones I'm worried about are the ones in this Web



152

00:08:50,350 --> 00:08:50,860

directory.



153

00:08:50,860 --> 00:08:52,360

And there's only one file there right now.



154

00:08:53,230 --> 00:08:58,840

It's actually going to compile those files and all the files that they depend upon from whatever packages



155

00:08:58,990 --> 00:09:01,020

that the application happens to use.



156

00:09:01,030 --> 00:09:05,530

So when I run this, everything should work and it runs.



157

00:09:05,800 --> 00:09:09,610

And if I go to my Web browser and load the about page, no problem.



158

00:09:10,060 --> 00:09:11,290

Load the home page.



159

00:09:11,290 --> 00:09:12,100

No problem.



160

00:09:12,340 --> 00:09:13,720

That worked really well.



161

00:09:14,110 --> 00:09:16,450

OK, so there's two more things I want to do.



162

00:09:16,990 --> 00:09:21,460

I want to pass data templates and I want to use layouts, but I'm going to put those into their own



163

00:09:21,460 --> 00:09:21,970

lectures.



164

00:09:21,970 --> 00:09:24,910

Just so if you need to come back, it's easier to find things.



165

00:09:24,910 --> 00:09:31,360

OK, so we'll move on in the very next lecture to using layouts and then in that lecture after that,



166

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we'll pass data to our HTML templates to our go templates.



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All right.



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See you in the next lecture.