WEBVTT
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Good evening again. I think
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I have a little time here
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to talk about macros.
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Is there still room in
our schedule for that,
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or should I just jump to some of
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my thoughts on the day?
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([Amin:] Pretty sure we
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have some time.)
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[Corwin:] All right. Great.
([Amin:] Yeah, go for it.)
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Well, I'll just dive into my
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prepared thing here then.
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(Amin: yeah, actually, you're
right on time, so...)
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[Corwin:] oh what an amazing thing.
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I just... You know, I have been
trying to do what I...
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I've got a big thank you planned
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at the end, but let me just say,
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it's been really cool to watch the
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way that people work together.
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([Amin:] Absolutely. It's...
This whole event today has been
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nothing but awesome, and
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no little part thanks to all of the help
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from all of you guys and everyone.
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Yeah, it's awesome.
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With that, I'll just shut up
for now.
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Take it away, Corwin.)
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[Corwin:] Who knows how to make
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make that the default in good old smex?
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All right. So I'm gonna try to continue
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my theme from the previous talk.
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I'm a longtime Emacs user,
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but I'm a pretty new person
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to trying to really understand
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what's going on within Emacs and make
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my customizations to it--simple for
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what I tend to just think of will work.
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And maybe that's a nice bow
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to put on that earlier talk.
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Let's see here now. It's C-x M-i.
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That's right.
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And let's try that again. Okay, good.
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So demoing is fun,
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but I will save most of that
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for tomorrow where my
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dear friend and co-collaborator
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in bringing you the dungeon-mode project,
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which is sort of the exciting thing
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that we hope you'll be interested in,
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gets a little more of a reveal.
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Tonight, I'll just close saying
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a few things about the process of
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making it and continuing my theme of
community.
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First of all, a specific and upfront
shout out
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to tv's wasamasa who
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absolutely shaped and guided this
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this program. I may have taken out
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a slide with your name on it,
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but thank you.
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So when we think about Emacs macros
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and the power that they give us,
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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 going to be talking to us
about code.
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Excuse me, I realize I hadn't
set my timer.
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Here we are.
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So a simple macro syntax is
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going to generate
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something that is implicitly confusing
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to somebody that knows the syntax
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of Emacs Lisp well.
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We see something like this
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and a veteran eye says
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"That x isn't quoted. What's going on?"
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but it can be hard to miss.
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A lot of the functions (as we'll talk
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about in a moment) that are built
into Emacs
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really are macros, so a lot of
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Emacs 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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Let's just jump right into defmacro,
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which is our key entry point.
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The notes from this talk
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include the link to that,
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which... Definitely
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read through a couple of times.
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That may take you through
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into the cl-def macro, which adds
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the Common Lisp extensions.
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Definitely challenging.
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I've struggled there,
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as we'll take a look at
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in a moment.
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So I haven't played too much with
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cl-maclet. Perhaps success in
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in that keyword space
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and figuring out what
the right balance is there
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will give me the confidence to try
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some more lexical macros.
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Let me also briefly introduce
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the comma (,) and back quote (`).
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If you have allowed your eyes
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to cross when you see these,
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that's not a shameful,
shameful thing.
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It's confusing, and we should be
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alerting each other
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when we stick macros in,
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often by putting them in
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different library spaces
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for complicated projects,
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or otherwise warning people
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that this is not an interactive function,
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even if you get away
with using it like one.
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Watch your back.
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The manual itself talks about macros
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as being a way of evaluating,
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as being an evaluator that will take
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our Emacs Lisp expression
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and the set of forms that
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will feed to it our code,
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but it also provides us with
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this concept of an environment.
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That's really where the power
comes in.
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Through that, we can have
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lexical variables and
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think about--bring in some of the
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capabilities that
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can be harder to reach with
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a pure declarative statement that
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doesn't allow for top level
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asynchronous... Asynchronicity...
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I'm gonna basically
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ignore the byte-compilation phase
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for this talk
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in order to have any prayer
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of getting through it in the
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remaining 9 or 11 minutes or whatever.
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But suffice to say,
that's a scary space,
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and that's really
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the thing that you want to
00:06:53.800 --> 00:06:55.277
start learning about
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as you think about
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taking macros on in earnest.
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Coming back to the comma syntax,
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then, having given ourselves 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 backquote (`)
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is going to give code back.
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to the stream--or interject, sorry,
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it's going to interject
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back into the stream.
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Sort of an exclamatory "Excuse me,
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I'd like to have a value here."
We can take that value
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from the environment as it exists
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when our macro is evaluated.
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Backquote, on the other hand,
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takes the result from that
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and returns it back to the stream
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for evaluation at the
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processing level that 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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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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I won't linger on this slide,
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but briefly: this is a
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role-playing, pen and pencil,
00:08:41.615 --> 00:08:43.829
physical dice tradition
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that dates back a long time
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from a technology perspective.
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It's old in the same way
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that other tools that I like
are old.
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It's simple to understand.
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I can communicate a lot with it
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with a simple amount of typing
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or scribbling something
on a piece of paper.
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It has a complicated problem space
of its own.
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Again, I don't want to
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get too much into the game here,
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but in this talk,
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for the last five minutes,
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I'll focus on the process
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that we took to
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automate getting data out of
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the Org Mode tables
which eventually
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(as we'll talk about more
tomorrow)
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are used to draw
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game maps and other things.
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Here I talk about why we did
that.
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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 symbolic informatics.
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We're giving a symbolic name
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to a tile set,
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and then assigning that tile set some
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some characteristics
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like physical speeds, screen space
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(a variable that we might
00:10:08.399 --> 00:10:12.800
want to swap in), and so forth.
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You know, our project rests heavily on
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Org Mode and its
fundamental capabilities.
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The code I'm going to show here
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is focused around a sticky
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problem space in
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information technology.
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I'm a professional software engineer
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turned technology architect.
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I support the websites for
00:10:43.495 --> 00:10:46.533
a recognizable financial services brand
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that I don't identify
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just so I don't accidentally end up
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inadvertently misrepresenting my firm
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in some financial perspective
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if I let some other
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companies' name slip, or my own.
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It's certainly no representation
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of an opinion other than my own.
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So ETL has to do with moving data around.
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We have the idea of
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a pipeline where we'll be able to verify
00:11:29.200 --> 00:11:30.560
certain assumptions,
00:11:30.560 --> 00:11:32.106
nominally about data quality,
00:11:32.106 --> 00:11:33.600
but it could be about anything.
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Before the pipeline starts, okay,
00:11:35.630 --> 00:11:36.886
we've got a state where we think
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it should work if we run it.
00:11:38.560 --> 00:11:41.920
We have some extraction where we'll
00:11:41.920 --> 00:11:43.973
get our sources, and we may have
00:11:43.973 --> 00:11:45.040
the opportunity to
00:11:45.040 --> 00:11:47.327
make some assertions there.
00:11:47.327 --> 00:11:50.510
In the transform stage,
as well as the load,
00:11:50.510 --> 00:11:52.720
things get a little dicer,
00:11:52.720 --> 00:11:54.079
to the point where we come out of the
00:11:54.079 --> 00:11:55.360
load stage and we should have some
00:11:55.360 --> 00:11:56.676
really solid assertions again
00:11:56.676 --> 00:11:57.724
that we can even go back
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and compare to the extract stage.
00:11:59.680 --> 00:12:02.639
From this, we have the rudimentaries
00:12:02.639 --> 00:12:04.959
of a data quality practice.
00:12:04.959 --> 00:12:08.120
In this case, we have a number of
00:12:08.120 --> 00:12:09.360
Org Mode files that will all
00:12:09.360 --> 00:12:12.639
be distributed across a
00:12:12.639 --> 00:12:16.720
number of players' computers,
00:12:16.720 --> 00:12:18.959
so we might not want to update every
00:12:18.959 --> 00:12:20.320
part of every buffer.
00:12:20.320 --> 00:12:22.720
I think it's a complicated problem space.
00:12:22.720 --> 00:12:24.560
So we tried to take
00:12:24.560 --> 00:12:27.839
a long-term view of
00:12:27.839 --> 00:12:30.321
the solution that we needed.
00:12:30.321 --> 00:12:32.160
So I'll go ahead
00:12:32.160 --> 00:12:36.279
and open up the function
that...
00:12:36.279 --> 00:12:39.020
Let's actually start with the one
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that's pretty easy to read.
00:12:41.680 --> 00:12:46.800
I'm gonna go ahead and
just crank it up huge,
00:12:46.800 --> 00:12:51.680
in case anybody's watching in 480.
00:12:51.680 --> 00:12:57.733
This program is not a work of art
00:12:57.733 --> 00:13:01.120
It's a simple implementation
of the idea that
00:13:01.120 --> 00:13:04.000
an alist of functions
00:13:04.000 --> 00:13:06.633
that return maybe some data,
00:13:06.633 --> 00:13:10.399
maybe some data and an entry
back into that alist,
00:13:10.399 --> 00:13:13.040
can be done quite extensively with
00:13:13.040 --> 00:13:15.680
very few lines of code.
00:13:15.680 --> 00:13:17.586
Neither is it an especially tight
00:13:17.586 --> 00:13:19.600
or thrifty implementation.
00:13:19.600 --> 00:13:22.000
It's just trying to get the job done
00:13:22.000 --> 00:13:25.056
with a doc statement for everything.
00:13:25.056 --> 00:13:28.595
At the heart, we see a call to
00:13:28.595 --> 00:13:32.067
this macro called dm-coalesce-hash,
00:13:32.067 --> 00:13:33.714
and that's what I'd like
to focus in on.
00:13:33.714 --> 00:13:35.360
You can see... I think
00:13:35.360 --> 00:13:38.800
that something unpleasant is
happening here.
00:13:38.800 --> 00:13:43.991
I've got an eval in what is...
00:13:43.991 --> 00:13:49.519
I will share a fairly central function
00:13:49.519 --> 00:13:52.160
that those implementing
this ETL pattern are
00:13:52.160 --> 00:13:54.933
welcome to derive from.
00:13:54.933 --> 00:13:57.680
That is, this is a
default transform
00:13:57.680 --> 00:14:00.959
that you can get when loading
certain kinds of
00:14:00.959 --> 00:14:04.560
org-mode tables that have been
00:14:04.560 --> 00:14:06.399
properly adorned. Again, we'll get
00:14:06.399 --> 00:14:09.120
into that all tomorrow.
00:14:09.120 --> 00:14:11.900
So, keeping an eye on time.
Couple minutes left.
00:14:11.900 --> 00:14:13.760
Let's look at the macro itself.
00:14:13.760 --> 00:14:15.000
I have a slide on this,
00:14:15.000 --> 00:14:24.639
but let's go 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 --> 00:14:44.720
and "add to list," 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 alist versus
00:14:49.360 --> 00:14:50.967
hashes versus plists.
00:14:50.967 --> 00:14:53.178
We've made a right mess for
ourselves
00:14:53.178 --> 00:14:54.399
in the proof of concept area,
00:14:54.399 --> 00:14:57.433
and it's ripe for someone to write a
00:14:57.433 --> 00:14:58.560
whitepaper about
00:14:58.560 --> 00:15:00.240
when to prefer these things.
00:15:04.800 --> 00:15:08.000
The merge alist...
00:15:08.000 --> 00:15:12.959
Same work here.
Let's get down to business.
00:15:12.959 --> 00:15:14.667
This function has quite a...
00:15:14.667 --> 00:15:17.467
This macro has quite a doc string.
00:15:17.467 --> 00:15:20.720
I think I mentioned earlier
that I got myself into
00:15:20.720 --> 00:15:22.088
trouble with the keyword properties.
00:15:22.088 --> 00:15:23.519
You can see that we have
00:15:23.519 --> 00:15:27.359
not only quite a number of them,
00:15:27.359 --> 00:15:31.155
but a lot of default values,
00:15:31.155 --> 00:15:35.446
many of which may be relying on
00:15:35.446 --> 00:15:37.264
the values that are passed in here.
00:15:37.264 --> 00:15:40.000
This is complicated. As it turns out,
00:15:40.000 --> 00:15:44.000
I wasn't brave enough in most cases
00:15:44.000 --> 00:15:45.485
to try to write a lambda
00:15:45.485 --> 00:15:47.279
that could understand and
00:15:47.279 --> 00:15:49.300
replace its own local variable.
00:15:49.300 --> 00:15:50.399
I just didn't...
00:15:50.399 --> 00:15:53.519
It didn't save me enough time. This was
00:15:53.519 --> 00:15:56.532
really easy to read and write and
understand
00:15:56.532 --> 00:15:58.240
as I thought through my problem,
00:15:58.240 --> 00:16:00.000
but now, as I use it,
00:16:00.000 --> 00:16:02.486
I've lost a little ground with
this.
00:16:02.486 --> 00:16:04.079
I'm not even sure
00:16:04.079 --> 00:16:06.453
I like what I got from
00:16:06.453 --> 00:16:09.341
the many keyword properties
when it...
00:16:09.341 --> 00:16:11.920
And we can look, perhaps if we have
00:16:11.920 --> 00:16:17.340
the time, at what that looks like in
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
So that's just about my time.
00:16:27.519 --> 00:16:29.600
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
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
([Amin]: Thank you very
00:16:48.720 --> 00:16:50.720
much for your talk, Corwin.
00:16:50.720 --> 00:16:53.839
I think you still have
00:16:53.839 --> 00:16:55.027
maybe three or four more minutes,
00:16:55.027 --> 00:16:57.680
if you want to quickly wrap up.)
00:16:57.680 --> 00:17:00.644
[Corwin:] Okay, so three or four
more minutes
00:17:00.644 --> 00:17:05.439
I can easily spend 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 pad.
00:17:10.160 --> 00:17:12.559
([Amin:] 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 --> 00:17:16.777
[Corwin:] I am. I bookmarked it.
00:17:16.777 --> 00:17:30.840
I am pulling the tab
and I'll bring it in.
00:17:30.840 --> 00:17:38.799
Okay. All right. This is the wrong
Etherpad.
00:17:38.799 --> 00:17:44.480
Thanks for the link.
00:17:44.480 --> 00:17:54.880
All right. So I think I'm
looking for macros.
00:17:54.880 --> 00:17:57.630
Okay. Key message. Sure.
00:17:57.630 --> 00:18:01.679
So, the key message is that it's
00:18:01.679 --> 00:18:02.960
a jungle out there.
00:18:02.960 --> 00:18:05.912
Macros, along with any other design,
00:18:05.912 --> 00:18:08.559
can leave you in a position
00:18:08.559 --> 00:18:11.919
where you have a nice API. 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 --> 00:18:20.820
this exact same formula,
00:18:20.820 --> 00:18:23.840
quickly sketching out
how a character sheet
00:18:23.840 --> 00:18:26.180
or another big data set
00:18:26.180 --> 00:18:28.480
needs to figure out
what tables are
00:18:28.480 --> 00:18:29.320
going to be interesting
00:18:29.320 --> 00:18:30.720
from the collection of files,
00:18:30.720 --> 00:18:33.967
and then load up the tile set,
00:18:33.967 --> 00:18:38.880
and the layout file from that.
00:18:38.880 --> 00:18:40.542
And I mean, it works.
00:18:40.542 --> 00:18:42.677
The project is moving forward
with this.
00:18:42.677 --> 00:18:44.799
I have the flexibility that I need.
00:18:44.799 --> 00:18:46.559
But here I am evaling my own code
00:18:46.559 --> 00:18:48.640
to make darn sure even if I get
00:18:48.640 --> 00:18:52.400
byte-compiled, this macro
00:18:52.400 --> 00:18:55.440
does get evaluated in the user's real
00:18:55.440 --> 00:18:57.684
run time. Clearly a design fail.
00:18:57.684 --> 00:18:58.890
So that would be...
00:18:58.890 --> 00:19:00.880
The key point of my talk is to
00:19:00.880 --> 00:19:05.600
present this design fail and
00:19:05.600 --> 00:19:08.320
thank the community, but especially
00:19:08.320 --> 00:19:10.942
wasamasa for some patience.
00:19:10.942 --> 00:19:13.280
Let me add at this moment that
00:19:13.280 --> 00:19:13.333
he was so frustrated with me.
00:19:13.333 --> 00:19:17.115
They were sort of frustrated with me
00:19:17.115 --> 00:19:20.400
(I think I didn't qualify pronouns)
00:19:24.240 --> 00:19:26.287
with doing this. The first...
00:19:26.287 --> 00:19:27.985
This was one of our first
interactions,
00:19:27.985 --> 00:19:29.919
and 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 that's a great message, actually.
00:19:36.640 --> 00:19:39.520
I hope that maybe this
can encourage
00:19:39.520 --> 00:19:42.720
further talks across the subject about,
00:19:42.720 --> 00:19:43.808
you know, "Hey, wait a minute,
00:19:43.808 --> 00:19:45.549
macros are really fantastic,"
00:19:45.549 --> 00:19:47.018
as I hope I made clear.
00:19:47.018 --> 00:19:48.559
You can do a tremendous amount
00:19:48.559 --> 00:19:51.039
with them, and we rely on them
00:19:51.039 --> 00:19:55.200
for almost all the fun goodies,
00:19:55.200 --> 00:20:02.159
from defun, setq...
00:20:02.159 --> 00:20:04.639
I want to get to my thank yous.
00:20:04.639 --> 00:20:18.840
Let me just peek back at the pad.
00:20:20.000 --> 00:20:22.080
Well, that was actually a scratch buffer,
00:20:22.080 --> 00:20:24.720
so I'll have to read it cold off
my notes.
00:20:27.919 --> 00:20:30.320
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, Amin.
00:20:34.320 --> 00:20:36.080
In addition to the big thank you that I
00:20:36.080 --> 00:20:39.360
hope was implied by my shout out
to wasamasa,
00:20:39.360 --> 00:20:42.720
I also want to thank you, Amin, for
00:20:42.720 --> 00:20:46.640
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.
00:20:54.320 --> 00:20:56.358
You've also done a lot of great stuff
00:20:56.358 --> 00:20:59.360
for our project. Thank you very much for
that.
00:20:59.360 --> 00:21:03.400
Sacha Chua (I'll get there),
00:21:03.400 --> 00:21:15.919
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
for just being so flexible and
00:21:25.600 --> 00:21:27.600
nagging back through the whole thing,
00:21:27.600 --> 00:21:29.120
and especially to Leo
00:21:29.120 --> 00:21:32.159
who has done so much to
drive the show today.
00:21:32.159 --> 00:21:37.242
This is a fractious tent at times,
00:21:37.242 --> 00:21:39.800
and sometimes it is indeed
00:21:39.800 --> 00:21:41.360
a little bit of a circus,
00:21:41.360 --> 00:21:44.746
but I am learning so much so fast.
00:21:44.746 --> 00:21:46.880
I'm just inspired by how much
00:21:46.880 --> 00:21:49.333
Emacs can teach us.
00:21:49.333 --> 00:21:52.901
([Amin:] thank you, Corwin,
for your kind words
00:21:52.901 --> 00:21:54.960
about me, of course,
00:21:54.960 --> 00:21:56.000
about all of us
00:21:56.000 --> 00:21:58.000
and the conference...
00:21:58.000 --> 00:22:02.400
Indeed, thanks to everyone who's helped,
00:22:02.400 --> 00:22:04.159
including the speakers, of course,
00:22:04.159 --> 00:22:05.840
without whom EmacsConf really
00:22:05.840 --> 00:22:08.960
wouldn't have been a EmacsConf.
00:22:08.960 --> 00:22:10.640
It's been a pleasure
00:22:10.640 --> 00:22:12.366
knowing you and
working with you,
00:22:12.366 --> 00:22:15.743
from afar for the most part
00:22:15.743 --> 00:22:17.360
on dungeon-mode,
00:22:17.360 --> 00:22:19.937
helping with small things
here and there
00:22:19.937 --> 00:22:21.796
but yeah, it's been my pleasure,
00:22:21.796 --> 00:22:23.840
and it's great to have you and
00:22:23.840 --> 00:22:26.582
everyone else part of the
community,
00:22:26.582 --> 00:22:29.180
and for me to be part of the
community.
00:22:29.180 --> 00:22:30.559
It's been a lot of fun.
00:22:30.559 --> 00:22:33.679
Thank you.)
00:22:33.679 --> 00:22:35.206
[Corwin]: It's an honor.
00:22:35.206 --> 00:22:37.428
I don't use that word an awful lot
00:22:37.428 --> 00:22:39.867
because I sort of smirk at it.
00:22:39.867 --> 00:22:43.941
It gets us in a lot of trouble,
honor does,
00:22:43.941 --> 00:22:46.904
but this will be a sure time
to use it.
00:22:46.904 --> 00:22:48.840
([Amin:] Thank you.)
00:22:48.840 --> 00:22:51.840
[Corwin:] Likewise.
