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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.
00:12:51.680 --> 00:12:56.480
um so this this program is not
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a work of art it's a simple
00:12:58.560 --> 00:13:01.120
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
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