So, previously, I made a bot

that picked a random number between zero and 90,

generated this fractal tree using that angle,

using processing, made the image,

and then posted that image to Mastodon

using this coding train bot at bots in space,

bots in dot space, whatever, botsinspace.instance.

So, you can see a bunch of these here.

And so, now what I want to do...

And the bot, if we look at the code,

is just executing all of this stuff

to generate the image and post it once a day.

So, what I would like to do now

in this video is change it.

Well, I'm not going to use setInterval.

In fact, I'm not ever going to post an image.

I am only going to post an image

as a reply to somebody else.

And I'm going to look in their reply,

find the angle that they have specified,

and send them back a tree with that angle.

And you can just imagine

the possibilities of things you can do.

I mean, one of my favorites, this is a Twitter bot,

but one of my favorite bots is Lowpoly Bot.

And what Lowpoly Bot does is,

is it still running, is the question.

'Cause most of these bots you can't...

One of the reasons why I'm using Mastodon

is that you can't really run these anymore on Twitter.

They've changed the API specifications too much.

So, the idea is that, you send in an image,

and an image processes for you and sends it back, okay.

So, I want to connect to the streaming API,

and I want to connect to the user stream,

meaning any time I get any sort of notification,

somebody favorites something, somebody mentions me,

re blogs me, if I post something, I think I get an event,

so the way that I do that is by saying M.stream.

Right, I have to go look it up here in this API.

M.stream path and parameters.

Returns a stream listener instance.

See examples how how to use it.

Okay, why not?

I've done this already in a previous video.

So, I could look at my previous code.

But let's actually...

Sorry, let's just go to examples, streaming.js.

Oh, and we can see that here.

So, this is what I want to do, I want to connect to the stream.

Create a stream instance.

All right, connecting to streaming/user.

And then, on a particular event,

like a notification, is that what it was?

Oh no, just a message.

So the event here is called message.

And then, on a message...

And this by the way, I've just been told

from the chat, thank you to Alca in the chat,

that the streaming API doesn't support promises.

So in this case, I do have to use a call back

and I can say response, I like to use the word response,

like this.

Now I do want to look up my previous code

'cause I need to figure out what,

I need to determine what I'm looking for in that response.

So I have that open here

and you can see that what I'm doing here

is if the event is a notification

and if it's a mention, that's what I'm looking for.

I'm looking for a mention.

So I'm going to say if response.event equals a notification.

I'm just only going to do mentions.

And response.data.type I think equals mention.

Is that right?

I should be just looking at my previous code.

Message .data.type.

Message .event.

So where is the mention in this one that I did?

Do do do do do.

Ah, message .data, it's right there.

Message .data.type so I'm using different variable names,

which is fine, but if the event is a notification

and the type of the event is a mention,

then, now, I am ready to basically do this.

The idea is if I'm mentioned, go ahead and do this.

But, and I don't need a separate function for this.

So I'm just going to take this here.

But, what I want to do

is I need to add some stuff to this.

So for example, I probably want to mention

a user account and I want to have a reply id

and also that angle.

So I need to, if I'm going to reply,

I want to at mention them, so I need their account

to reference.

Also, if I want it to be threaded,

I need the id of that post

so I can include that, and then the angle I want.

So now the angle shouldn't come,

oh I've got to send the angle in to processing.

Alright, that's going to be something we have to figure out.

Okay, I'm going to get to that in a second.

So let's try to get the whole flow of this working.

This is an interesting problem

that I completely forgot that I had to figure out.

So first, let me get the id is,

and I did this before, so I'm just going to,

we can see the id is this.

This is pulling the id out of,

and I said response instead of message, which is fine.

And then the account name is right here.

So I want to also get the account,

which is also response.

So I can then pass on the account,

pass on the id, now the angle is a tricky one.

So what am I expecting the person to say?

I guess I'm expecting somewhere in their post

that there's a number.

And they could put multiple numbers,

I'm just going to pick the first number.

So what I'm going to do, whoops.

This is by the way my inspiration, the tree bot.

But where am I?

I'm looking at my code.

I need to get the content of what they've sent me.

This is their message content.

So what I want to do is use a regular expression.

So my regular expression is going to be

I need to find a number.

The number that I want is between two and three digits.

So I guess I'm going to allow...

I mean, do I allow an angle greater than 90?

I mean, sure.

I could actually, it could be any number.

I could really just say any number.

It doesn't matter how big.

So I want to match this.

And so if I say regular...

Oh, if I say content.match regular expression.

Is this--

Now I've forgotten how regular expressions work.

So let's just go to the browser for a second

and let's noodle around here.

So let's say if I make a regular expression

and I make it equal to this,

and then I have a string

like hello 42 goodbye.

If I saw s.match that regular expression,

what do I get?

Ah, perfect.

I get what it matched, the index, and some more information.

All I care about is what it matched.

And I don't need it to be global.

I don't need it to get all the numbers.

I could get all the numbers and average them or something.

But I'm just going to get the first one.

So this is fine.

So then I'm going to...

And I do have to deal with the fact,

what if it doesn't match anything?

So let's see what it gives me if it doesn't match.

So let's say s equals this.

And I'm going to say s match regular expression.

Null, so that's fine.

So now I'm going to say results equals content

match regular expression and the angle,

so I'm going to say if results,

or I could,

if results, I could probably use that ternary thing.

Then the angle equals results index zero,

otherwise angle equals,

oh otherwise I'm going to say there's no angle.

I could reply and say you need to mention me with a number.

So I'll...

So I'm actually going to just say,

yeah, angle equals negative one.

So I'm going to use negative one as like a...

And I can actually just do this

and then do this, okay.

Great great great great great.

So now in theory, now I can pass that angle here.

So alright, now one thing I can do.

Let's just do this.

So if, the first thing I want to do

is just say if angle equals negative one,

right, if I've gotten a negative one angle,

I want to actually

just be done.

Like I want to say...

Oh but I have to mention the person.

Okay, so I have to say

if in a status post,

can I find that here?

Right, so the text of the status

is this text of the status in reply to id,

so this is important.

So I'm going to say...

Please specify an angle in degrees using digits.

'Cause it won't work if you say the word ninety.

Then I need to say

in reply, what is it?

In reply to id, in reply to id is that reply id.

And then also

I want to use the account.

So I'm going to, I want to start with the account.

Account, and do I say at?

I think I have to say at the account.

Please specify an angle in digits.

Then in reply to id.

Okay, so this is good and I'll call this,

and then I'm going to say

response,

I'm going to say params and response

and success, angle, negative one.

Okay, so this now should...

If I run this...

And then I'm going to put an else here.

This function has gotten quite long.

But basically what I'm doing

is first I'm checking if there was a legitimate angle.

And if there wasn't, I'm replying back to say

please specify an angle in degrees

and then let's see how that goes.

So right now if I run this bot,

oh I forgot to make a new one.

That's fine.

If I run this bot, somebody should feel free

to at mention me

without a digit.

Can somebody do that please?

Alright, somebody at messaged me,

thank you for helping me debug this.

And I got an error in bot.js line 25.

Bot.js line 25, ah, response, response, response.

Sorry!

Response, response, alright let's try this again.

Be prepared.

Alright, at mention me with no number please.

You can put a number in it, but it won't work

if you put a number in it.

Alright, oo!

Interesting.

Can someone please?

There we go, okay.

So let's take a look,

so someone mentioned me with a number.

That's great that we had both of those tested.

And we can see this one

said please specify an angle in degrees using digits.

That's right.

And then this one

just said behold my beautiful tree.

So I haven't done the thing where I actually get the angle.

So let's first, let's just first

if I really do get an angle,

let's do all the same steps

but right now, I'm going to also add