path: root/2020/subtitles/emacsconf-2020--20-omg-macros--corwin-brust-autogen.vtt

WEBVTT

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uh well good evening again uh I think I

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have a little time here

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uh to talk about macros uh is there

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still room in our in our schedule for

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that

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or should I just kind of jump to some of

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my thoughts on the day

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you are now unmuted um pretty sure we

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have some time

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all right great yeah go for it well I'll

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just drive into my pre

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prepared thing to hear that yeah

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actually you're right on time so

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oh what an amazing thing I I just uh

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you know I have been trying to do what I

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I've got a big thank you planet to get

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at the end but let me just say I uh

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it's it's been really cool to watch the

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way that people work together

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absolutely it's this whole event today

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has been

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nothing but awesome and uh no less like

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no little part thanks to all of the help

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from all of you guys

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and um everyone oh yeah it's awesome

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um yeah with that all just um shut up

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for now and uh

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take it away corwin you know how to make

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make that the default and good old cemex

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all right so I'm gonna try to continue

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my theme from the previous talk I'm a

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longtime Emacs user but I'm

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a pretty new person

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to trying to really understand what's

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going on within Emacs and make

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my customizations to it uh simple for

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what I tend to just think of will work

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and maybe that's that's that's a nice

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bow to put on that earlier talk

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so uh whoops

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uh let's see here now it's ctrl x

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alt I that's right

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and let's try that again okay good

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so demoing is fun uh but I

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will save most of that for tomorrow

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where my

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dear friend and co-collaborator in

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bringing you the dungeon mode project

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which is uh sort of

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the exciting thing that we we hope

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you'll be interested in

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um I think gets a little more of a

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reveal

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uh tonight I'll just uh close saying

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um a few things about the process of

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making it and continuing my theme of

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community

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uh first of all a specific and upfront

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shout out

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to tv's wasa masa who

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um absolutely shaped and guided this

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this program I I may have taken out a

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slide with your name on it but

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thank you um

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so when we think about Emacs macros and

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the

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power that they give us

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I think about them the the

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you know I think about them as a really

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deep rabbit hole they confuse

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people a lot and so to try to center

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myself on that I remember first that

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they're

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they're going to be talking to us about

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code

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uh excuse me I realize I hadn't set my

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timer

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here we are

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um so a simple macro syntax is going to

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generate

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something that is implicitly confusing

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to somebody that knows the syntax of

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emax lisp

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well we see something like this and a

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veteran I

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says that x isn't quoted what's going on

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but it can be hard to miss

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um a lot of the functions as we'll talk

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about in a moment that are built into

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Emacs

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really are macros so a lot of Emacs

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features work this way

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it might be scary but we have to look at

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it closely if we really want to get

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friendly with Emacs

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um let's just jump right into deaf macro

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which is which is our key entry point

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and the

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notes from this talk include the link um

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to that uh which which definitely

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uh read through a couple of times and

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that may take you through

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into the cldf macro which adds

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the common list lisp extensions

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and uh definitely

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uh challenging uh I've struggled there

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as we'll take a look at in

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in a moment um

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so I haven't played too much with cl

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maclet perhaps success in

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in that uh keyword space and figuring

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out what the right balance is there

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what will give me the confidence to try

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some more lexical

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uh macros

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let me also briefly introduce the comma

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and back quote if you

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have uh allowed your eyes to cross when

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you see these and that's not

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uh a shameful shameful thing it's

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confusing and we should be

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alerting each other when we when we

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stick macros in

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often by putting them in different

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different library spaces for complicated

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projects

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or um otherwise sort of warning people

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that this is not an interactive function

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if you get away with using it like one

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um

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to watch your back

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the uh

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the manual itself talks about macros

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as being a way of evaluating

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you know as as being um

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an evaluator that will take our amex

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lisp expression

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and the set of forms that kind of that

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will feed to it our code

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[Music]

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but it also provides us with this

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concept of an

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environment and and and that's really

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where the power

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comes in through that we can have

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lexical variables and

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um think about uh bring in some of the

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capabilities that

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um can be harder to reach with

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a a a pure declarative statement that

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doesn't allow

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for uh

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top level

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um asynchronous asynchronicity

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uh I'm gonna basically

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[Music]

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ignore the bike compilation phase for

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this talk

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uh in order to have any prayer of

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getting through it in the

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remaining nine or 11 minutes or whatever

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uh but

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suffice it to say it that's a scary

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space and that's that's that's really

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the thing that you want to start

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learning about as you think about taking

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taking macros on uh in earnest

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the um coming back to the comma syntax

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then

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having having given ourselves sort of a

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working definition for the Emacs lisp

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runtime environment then we can say that

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macros are going to

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inject code back into that stream

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whereas back quote is going to

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uh going to give code back

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to the to the stream or interject sorry

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it's going to interject uh back into the

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stream

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uh sort of uh an exclamatory excuse me

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I'd like to uh

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have a value here and we can take that

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value from the environment as it exists

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when our macro is evaluated

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back quote on the other hand takes the

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result

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from that and uh

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and returns it back to the stream for

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evaluation at the processing level that

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invoked us

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so in other words perhaps back up to

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a top level eval expression where our

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macro is invoked

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uh wrong way so um

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with what's I'm going to briefly bring

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you back to the game

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for just a moment

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um I won't

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I won't has I won't linger on this slide

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but but

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briefly uh this is a

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roll paper role-playing pen

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and pencil uh physical dice

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tradition that dates back a long time

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from a technology perspective

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it's it's old in the same way that uh

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other tools uh that I like are

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old

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uh it's simple to understand and I can

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communicate a lot with it with a simple

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amount of you know typing or

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scribbling something on a piece of paper

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it has a complicated problem space um

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of its own again I don't want to

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get too much into the game here but

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uh in this in this talk for the last

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five minutes I'll focus

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on the process that we took to to

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automate uh getting data out of the org

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mode tables which

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eventually as we'll talk about more

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tomorrow are used to draw

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game maps and other things

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um here I talk about kind of why we did

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that I'm going to skip briefly past that

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and say instead that at a high level

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it's it's symbolic informatics we're

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giving a symbolic name

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to a tile set and then

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uh

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and then assigning that tile set some

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some characteristics like physical

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speeds

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screen space a variable that we might

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want to swap in

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and so forth uh and

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you know our project rests heavily on on

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org mode and

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it's it's fundamental capabilities

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so the the code I'm going to show here

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is

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uh is

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is focused around sort of a a sticky

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problem space in in the information

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technology and I'm I'm a professional

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uh uh software engineer turned uh

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technology architect I support

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the websites for a recognizable

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financial services brand that I don't

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identify just so I don't accidentally

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end up

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uh inadvertently misrepresenting my firm

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in some financial

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uh perspective if I let some other

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companies slip at certain let some other

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companies slip

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name slip or my own it's certainly no

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representation of an opinion other than

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my own

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the um

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[Music]

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so etl has to do with moving data around

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we we have the idea of of

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a pipeline where we'll be able to verify

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certain assumptions not

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nominally about data quality but it

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could be about anything

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before the pipeline starts okay we've

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got a state where we think it should

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work if we run it

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we have uh some extraction where we'll

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get our sources and we may have the the

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opportunity to

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uh make some assertions there and in the

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transform

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stage as well as the load things get a

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little dicer

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to the point where we come out of the

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load stage and we should have some

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really solid assertions again that we

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can even go back and compare to the

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extract stage

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and from this we have the rudimentaries

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of a data quality practice

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uh in this case we have a number of org

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mode files that will all

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be distributed across a

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number of players uh computers

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so we might not want to update every

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part of every buffer

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I think it's a complicated problem space

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and so we tried to take

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a long-term view of

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the solution that we needed um so I'll

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go ahead

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and open up the fun function

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that well let's let's actually start

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with the one that's pretty easy to read

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and uh I'm gonna go ahead and just crank

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it up huge

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in case anybody's watching in 480.

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um so this this program is not

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a work of art it's a simple

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implementation of the idea that a list

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an a list of functions that return

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maybe some data maybe some data and an

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entry back into that a list

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um can be done quite extensively with

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very few lines of code

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neither is it an especially tight or

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thrifty implementation

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it's just trying to get the job done

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with a doc

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statement for everything at the heart

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um we see a call to this macro called dm

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coalesce hash and that's what I'd like

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to focus in on you can see I think

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that something on unpleasant is

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happening here

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I've got an eval in um

00:13:42.480 --> 00:13:46.560
what is I will share a a

00:13:46.560 --> 00:13:49.519
fairly central function that that that

00:13:49.519 --> 00:13:49.920
that

00:13:49.920 --> 00:13:52.160
those implementing this etl pattern are

00:13:52.160 --> 00:13:53.920
welcome to

00:13:53.920 --> 00:13:56.639
derive from that is this is a default

00:13:56.639 --> 00:13:57.680
transform

00:13:57.680 --> 00:13:59.680
that you can get when loading certain

00:13:59.680 --> 00:14:00.959
kinds of

00:14:00.959 --> 00:14:04.560
uh orgmo tables that have been uh

00:14:04.560 --> 00:14:06.399
properly adorned and again we'll get

00:14:06.399 --> 00:14:09.120
into that all tomorrow

00:14:09.120 --> 00:14:11.440
so keep an eye on time couple minutes

00:14:11.440 --> 00:14:13.760
left let's look at the macro itself and

00:14:13.760 --> 00:14:15.360
I have a slide on this but let's go

00:14:15.360 --> 00:14:24.639
ahead and risk getting off page

00:14:24.639 --> 00:14:27.199
oh boy here we go so this is my

00:14:27.199 --> 00:14:28.959
utilities bucket

00:14:28.959 --> 00:14:31.920
it has such basic features as give me a

00:14:31.920 --> 00:14:34.000
hash table with some defaults I'll think

00:14:34.000 --> 00:14:36.000
about that later

00:14:36.000 --> 00:14:39.680
and

00:14:39.680 --> 00:14:44.720
and add to list um a special version

00:14:44.720 --> 00:14:47.600
that enables us to be a little cavalier

00:14:47.600 --> 00:14:49.360
in experimenting with a-list versus

00:14:49.360 --> 00:14:50.480
hashes versus p

00:14:50.480 --> 00:14:52.800
lists we've made a right mess for

00:14:52.800 --> 00:14:54.399
ourselves in the proof of concept area

00:14:54.399 --> 00:14:55.279
and it's ripe

00:14:55.279 --> 00:14:58.560
for someone to write a white paper about

00:14:58.560 --> 00:15:00.240
when to prefer these things

00:15:00.240 --> 00:15:04.800
and fix

00:15:04.800 --> 00:15:08.000
the merge a list uh

00:15:08.000 --> 00:15:10.720
same work here let's get let's get down

00:15:10.720 --> 00:15:12.959
to business

00:15:12.959 --> 00:15:16.000
this function has quite a this a macro

00:15:16.000 --> 00:15:18.560
has quite a doc string and I think I

00:15:18.560 --> 00:15:20.720
mentioned earlier that I got myself into

00:15:20.720 --> 00:15:22.240
trouble with the keyword properties you

00:15:22.240 --> 00:15:23.519
can see that we have

00:15:23.519 --> 00:15:27.839
not only quite a number of them but

00:15:27.839 --> 00:15:32.240
a lot of a lot of default values many of

00:15:32.240 --> 00:15:32.880
which

00:15:32.880 --> 00:15:36.000
may be relying on the

00:15:36.000 --> 00:15:37.680
values that are passed in here this is

00:15:37.680 --> 00:15:40.000
complicated and as it turns out

00:15:40.000 --> 00:15:44.000
um I wasn't brave enough in most cases

00:15:44.000 --> 00:15:46.079
to try to write a lambda that could

00:15:46.079 --> 00:15:47.279
understand and

00:15:47.279 --> 00:15:49.680
replace uh its own local variable I just

00:15:49.680 --> 00:15:50.399
didn't

00:15:50.399 --> 00:15:53.519
it didn't save me enough time this was

00:15:53.519 --> 00:15:54.800
really easy

00:15:54.800 --> 00:15:56.800
to read and write and understand as I

00:15:56.800 --> 00:15:58.240
thought through my problem

00:15:58.240 --> 00:16:01.440
but now as I use it I I've lost a little

00:16:01.440 --> 00:16:03.360
ground maybe with this and I'm not even

00:16:03.360 --> 00:16:04.079
sure

00:16:04.079 --> 00:16:07.279
I like what I got from uh the many

00:16:07.279 --> 00:16:08.079
keyword

00:16:08.079 --> 00:16:10.560
properties when it and we can look

00:16:10.560 --> 00:16:11.920
perhaps if we have

00:16:11.920 --> 00:16:17.340
the time at what that looks like in uh

00:16:17.340 --> 00:16:19.920
[Music]

00:16:19.920 --> 00:16:22.720
oh all right I have to separately

00:16:22.720 --> 00:16:24.480
dismiss and restart that

00:16:24.480 --> 00:16:27.519
um so that so that's just about my time

00:16:27.519 --> 00:16:29.600
uh and being respectful of that I want

00:16:29.600 --> 00:16:31.920
to invite presenters to just jump in at

00:16:31.920 --> 00:16:35.519
any of the many large pauses I leave

00:16:35.519 --> 00:16:38.079
uh as I'll just leave up the doc string

00:16:38.079 --> 00:16:40.160
for a moment and maybe split the screen

00:16:40.160 --> 00:16:45.199
and pull open an item

00:16:45.199 --> 00:16:48.720
you are now unmuted uh thank you very

00:16:48.720 --> 00:16:50.720
much for your talk corwin

00:16:50.720 --> 00:16:53.839
um I think you still have like uh

00:16:53.839 --> 00:16:55.279
maybe three or four more minutes if you

00:16:55.279 --> 00:16:57.680
want to quickly wrap up

00:16:57.680 --> 00:17:01.040
okay so three or four more minutes I can

00:17:01.040 --> 00:17:02.160
easily spend

00:17:02.160 --> 00:17:05.439
on thank yous

00:17:05.439 --> 00:17:07.280
I might switch to that if there aren't

00:17:07.280 --> 00:17:08.270
questions on the path

00:17:08.270 --> 00:17:10.160
[Music]

00:17:10.160 --> 00:17:12.559
um would you like me to pull up the pad

00:17:12.559 --> 00:17:14.079
or are you looking at it

00:17:14.079 --> 00:17:17.199
I am I bookmarked it I am

00:17:17.199 --> 00:17:30.840
pulling the tab and I'll bring it in

00:17:30.840 --> 00:17:34.960
okay

00:17:34.960 --> 00:17:38.799
all right this is the wrong ether pad

00:17:38.799 --> 00:17:44.480
thanks for the link

00:17:44.480 --> 00:17:48.000
all right um so I think I'm looking for

00:17:48.000 --> 00:17:54.880
macros

00:17:54.880 --> 00:17:58.400
uh okay key message sure so the

00:17:58.400 --> 00:18:01.679
the key message is that it's um it's a

00:18:01.679 --> 00:18:02.960
jungle out there

00:18:02.960 --> 00:18:06.240
macros along with any other design can

00:18:06.240 --> 00:18:08.559
leave you in a position

00:18:08.559 --> 00:18:11.919
where you have a nice api and I can show

00:18:11.919 --> 00:18:13.600
you other examples you can find them in

00:18:13.600 --> 00:18:14.960
the dungeon mode source

00:18:14.960 --> 00:18:18.480
of many many other places where I use

00:18:18.480 --> 00:18:21.600
this exact same formula quickly

00:18:21.600 --> 00:18:23.840
sketching out how a character sheet

00:18:23.840 --> 00:18:26.960
or another big data set needs to

00:18:26.960 --> 00:18:28.480
needs to figure out what tables are

00:18:28.480 --> 00:18:29.600
going to be interesting from the

00:18:29.600 --> 00:18:30.720
collection of files

00:18:30.720 --> 00:18:34.400
and then load up the tile set and

00:18:34.400 --> 00:18:38.880
the uh layout file from that

00:18:38.880 --> 00:18:41.600
and I mean it works this the project is

00:18:41.600 --> 00:18:43.280
moving forward with this I have the

00:18:43.280 --> 00:18:44.799
flexibility that I need

00:18:44.799 --> 00:18:46.720
but here I am evaling my own code to

00:18:46.720 --> 00:18:48.640
make darn sure even if I get by

00:18:48.640 --> 00:18:52.400
by compiled uh this macro doesn't uh

00:18:52.400 --> 00:18:55.440
does get evaluated in the user's real

00:18:55.440 --> 00:18:58.160
run time clearly a design fail so that

00:18:58.160 --> 00:18:58.880
would be

00:18:58.880 --> 00:19:00.880
the key point of my talk is is to

00:19:00.880 --> 00:19:02.400
present this design

00:19:02.400 --> 00:19:05.600
fail and uh thank

00:19:05.600 --> 00:19:08.320
um thank the community but especially

00:19:08.320 --> 00:19:09.520
wasa masa

00:19:09.520 --> 00:19:12.160
for for some patience and let me add at

00:19:12.160 --> 00:19:13.280
this moment that

00:19:13.280 --> 00:19:15.200
uh he was so frustrated with me they

00:19:15.200 --> 00:19:16.799
were sort of frustrated with me I think

00:19:16.799 --> 00:19:17.360
I

00:19:17.360 --> 00:19:20.400
didn't qualify pronouns um

00:19:20.400 --> 00:19:24.240
with um

00:19:24.240 --> 00:19:26.640
with doing this the the first the this

00:19:26.640 --> 00:19:28.160
was one of our first interactions and

00:19:28.160 --> 00:19:29.919
the feedback was

00:19:29.919 --> 00:19:34.240
why is this a macro full stop

00:19:34.240 --> 00:19:36.640
and uh that's a great message actually

00:19:36.640 --> 00:19:38.320
and I and I hope that

00:19:38.320 --> 00:19:40.160
uh maybe this can encourage further

00:19:40.160 --> 00:19:42.720
talks across the subject about

00:19:42.720 --> 00:19:44.160
you know hey wait a minute macros are

00:19:44.160 --> 00:19:46.720
really fantastic as I hope I made

00:19:46.720 --> 00:19:48.559
clear you can do a tremendous amount

00:19:48.559 --> 00:19:51.039
about uh with them and we rely on them

00:19:51.039 --> 00:19:52.320
for

00:19:52.320 --> 00:19:55.200
almost all the fun goodies um from you

00:19:55.200 --> 00:19:56.480
know defund

00:19:56.480 --> 00:20:02.159
secu

00:20:02.159 --> 00:20:04.960
um I want to get to my my thank yous let

00:20:04.960 --> 00:20:05.440
me just

00:20:05.440 --> 00:20:18.840
peek back at the pad

00:20:18.840 --> 00:20:20.000
oh

00:20:20.000 --> 00:20:22.080
well that was actually a scratch buffer

00:20:22.080 --> 00:20:23.760
so I'll have to sort of read it cold off

00:20:23.760 --> 00:20:24.720
my notes

00:20:24.720 --> 00:20:27.919
um

00:20:27.919 --> 00:20:30.320
but also but I'll switch to I'll also

00:20:30.320 --> 00:20:31.600
I'll say a couple of thank yous if you

00:20:31.600 --> 00:20:34.320
don't mind

00:20:34.320 --> 00:20:36.080
in addition to the big thank you that I

00:20:36.080 --> 00:20:38.400
hope was implied by my shout out to wasa

00:20:38.400 --> 00:20:39.360
masa

00:20:39.360 --> 00:20:42.720
um I also want to thank you amen for

00:20:42.720 --> 00:20:46.640
um your kindness in extending

00:20:46.640 --> 00:20:51.360
to the project as well as to me the

00:20:51.360 --> 00:20:54.320
the chance to present here and and and

00:20:54.320 --> 00:20:55.440
you've you've also

00:20:55.440 --> 00:20:56.799
just done a lot of great stuff for our

00:20:56.799 --> 00:20:59.360
project thank you very much for that and

00:20:59.360 --> 00:21:13.120
sasha

00:21:13.120 --> 00:21:15.919
I'll get there um thank you so much for

00:21:15.919 --> 00:21:17.200
the inspiration that you are to our

00:21:17.200 --> 00:21:18.320
whole community

00:21:18.320 --> 00:21:22.400
I also want to thank the presenters

00:21:22.400 --> 00:21:25.600
um for just being so flexible and

00:21:25.600 --> 00:21:27.600
uh nagging back through the whole thing

00:21:27.600 --> 00:21:29.120
and especially to leo

00:21:29.120 --> 00:21:30.960
who has done so much to drive the show

00:21:30.960 --> 00:21:32.159
today

00:21:32.159 --> 00:21:35.520
um I

00:21:35.520 --> 00:21:37.840
this is a fractious tent at times and

00:21:37.840 --> 00:21:38.960
sometimes

00:21:38.960 --> 00:21:41.360
it is indeed a little bit of a circus

00:21:41.360 --> 00:21:43.039
but I

00:21:43.039 --> 00:21:45.520
am learning so much so fast I'm just

00:21:45.520 --> 00:21:46.880
inspired by how much

00:21:46.880 --> 00:21:50.320
Emacs can teach us thank you

00:21:50.320 --> 00:21:53.120
uh corbin for your kind words and you

00:21:53.120 --> 00:21:54.960
know about me of course but all about

00:21:54.960 --> 00:21:56.000
you know all of us

00:21:56.000 --> 00:21:59.760
and the conference and you know indeed

00:21:59.760 --> 00:22:02.400
thanks to everyone who's helped uh

00:22:02.400 --> 00:22:04.159
including the speakers of course

00:22:04.159 --> 00:22:05.840
without whom you know a maxcom really

00:22:05.840 --> 00:22:08.960
wouldn't have been a EmacsConf

00:22:08.960 --> 00:22:10.640
and you know it's been a pleasure

00:22:10.640 --> 00:22:12.080
knowing you and working with

00:22:12.080 --> 00:22:15.520
you um I guess um from afar for the most

00:22:15.520 --> 00:22:17.360
part on dungeon mode like helping

00:22:17.360 --> 00:22:18.960
helping with like small things here and

00:22:18.960 --> 00:22:20.720
there but um

00:22:20.720 --> 00:22:22.320
yeah it's been my pleasure and it's

00:22:22.320 --> 00:22:23.840
great to have you and

00:22:23.840 --> 00:22:25.840
um everyone else you know part of the

00:22:25.840 --> 00:22:26.880
community and

00:22:26.880 --> 00:22:29.440
for me to be part of the community it's

00:22:29.440 --> 00:22:30.559
been a lot of fun

00:22:30.559 --> 00:22:33.679
thank you

00:22:33.679 --> 00:22:36.080
it's it's it's it's an honor and I don't

00:22:36.080 --> 00:22:38.000
use that word an awful lot because I

00:22:38.000 --> 00:22:38.720
sort of

00:22:38.720 --> 00:22:41.760
sort of smirk at it but um gets us in a

00:22:41.760 --> 00:22:44.320
lot of trouble honor does but

00:22:44.320 --> 00:22:47.360
this will be a sure time to use it thank

00:22:47.360 --> 00:22:48.840
you

00:22:48.840 --> 00:22:51.840
likewise