From 5b051096438bf250678fe78a864a5f55dc2274d4 Mon Sep 17 00:00:00 2001
From: Sacha Chua <sacha@sachachua.com>
Date: Sat, 16 Jan 2021 01:10:58 -0500
Subject: Rename file

---
 ...emacsconf-2020--20-omg-macros--corwin-brust.vtt | 1446 ++++++++++++++++++++
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diff --git a/2020/subtitles/emacsconf-2020--20-omg-macros--corwin-brust.vtt b/2020/subtitles/emacsconf-2020--20-omg-macros--corwin-brust.vtt
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+WEBVTT
+
+00:00:00.480 --> 00:00:02.879
+Good evening again. I think I
+
+00:00:02.879 --> 00:00:04.319
+have a little time here
+
+00:00:04.319 --> 00:00:07.359
+to talk about macros. Is there
+
+00:00:07.359 --> 00:00:09.440
+still room in our
+schedule for that,
+
+00:00:09.440 --> 00:00:11.440
+or should I just jump to some of
+
+00:00:11.440 --> 00:00:12.559
+my thoughts on the day?
+
+00:00:12.559 --> 00:00:15.920
+([Amin:] Pretty sure we
+
+00:00:15.920 --> 00:00:17.039
+have some time.)
+
+00:00:17.039 --> 00:00:19.039
+[Corwin:] All right. Great.
+([Amin:] Yeah, go for it.)
+
+00:00:19.039 --> 00:00:20.720
+Well, I'll just drive into my
+
+00:00:20.720 --> 00:00:22.384
+prepared thing here then.
+
+00:00:22.384 --> 00:00:24.720
+(Amin: yeah, actually, you're
+right on time, so...)
+
+00:00:24.720 --> 00:00:27.664
+[Corwin:] oh what an amazing thing.
+
+00:00:27.664 --> 00:00:31.199
+I just... You know, I have been
+trying to do what I...
+
+00:00:31.199 --> 00:00:33.040
+I've got a big thank you planned
+
+00:00:33.040 --> 00:00:36.239
+at the end, but let me just say,
+
+00:00:36.239 --> 00:00:39.200
+it's been really cool to watch the
+
+00:00:39.200 --> 00:00:42.160
+way that people work together.
+
+00:00:42.160 --> 00:00:46.800
+([Amin:] Absolutely. It's...
+This whole event today has been
+
+00:00:46.800 --> 00:00:50.879
+nothing but awesome, and
+
+00:00:50.879 --> 00:00:53.120
+no little part thanks to all of the help
+
+00:00:53.120 --> 00:00:56.909
+from all of you guys and everyone.
+
+00:00:56.909 --> 00:00:59.120
+Yeah, it's awesome.
+
+00:00:59.120 --> 00:01:03.065
+With that, I'll just shut up
+for now.
+
+00:01:03.065 --> 00:01:04.891
+Take it away, Corwin.)
+
+00:01:04.891 --> 00:01:06.479
+[Corwin:] Who knows how to make
+
+00:01:06.479 --> 00:01:09.840
+make that the default in good old smex?
+
+00:01:09.840 --> 00:01:12.799
+All right. So I'm gonna try to continue
+
+00:01:12.799 --> 00:01:14.551
+my theme from the previous talk.
+
+00:01:14.551 --> 00:01:16.393
+I'm a longtime Emacs user,
+
+00:01:16.393 --> 00:01:20.240
+but I'm a pretty new person
+
+00:01:20.240 --> 00:01:22.380
+to trying to really understand
+
+00:01:22.380 --> 00:01:24.960
+what's going on within Emacs and make
+
+00:01:24.960 --> 00:01:28.240
+my customizations to it--simple for
+
+00:01:28.240 --> 00:01:30.960
+what I tend to just think of will work.
+
+00:01:30.960 --> 00:01:33.566
+And maybe that's a nice bow
+
+00:01:33.566 --> 00:01:36.240
+to put on that earlier talk.
+
+00:01:40.479 --> 00:01:44.981
+Let's see here now. It's C-x M-i.
+
+00:01:44.981 --> 00:01:48.159
+That's right.
+
+00:01:48.159 --> 00:01:52.960
+And let's try that again. Okay, good.
+
+00:01:52.960 --> 00:01:55.240
+So demoing is fun,
+
+00:01:55.240 --> 00:01:57.192
+but I will save most of that
+
+00:01:57.192 --> 00:01:59.759
+for tomorrow where my
+
+00:01:59.759 --> 00:02:02.750
+dear friend and co-collaborator
+
+00:02:02.750 --> 00:02:04.799
+in bringing you the dungeon-mode project,
+
+00:02:04.799 --> 00:02:07.261
+which is sort of the exciting thing
+
+00:02:07.261 --> 00:02:10.800
+that we hope you'll be interested in,
+
+00:02:10.800 --> 00:02:15.680
+gets a little more of a reveal.
+
+00:02:15.680 --> 00:02:19.360
+Tonight, I'll just close saying
+
+00:02:19.360 --> 00:02:22.640
+a few things about the process of
+
+00:02:22.640 --> 00:02:25.680
+making it and continuing my theme of
+community.
+
+00:02:25.680 --> 00:02:29.760
+First of all, a specific and upfront
+shout out
+
+00:02:29.760 --> 00:02:33.120
+to tv's wasamasa who
+
+00:02:33.120 --> 00:02:36.239
+absolutely shaped and guided this
+
+00:02:36.239 --> 00:02:38.582
+this program. I may have taken out
+
+00:02:38.582 --> 00:02:39.898
+a slide with your name on it,
+
+00:02:39.898 --> 00:02:43.599
+but thank you.
+
+00:02:43.599 --> 00:02:46.479
+So when we think about Emacs macros
+
+00:02:46.479 --> 00:02:50.239
+and the power that they give us,
+
+00:02:53.280 --> 00:02:54.720
+I think about them as a really
+
+00:02:54.720 --> 00:02:56.400
+deep rabbit hole. They confuse
+
+00:02:56.400 --> 00:03:00.239
+people a lot. And so, to try to center
+
+00:03:00.239 --> 00:03:02.480
+myself on that, I remember first that
+
+00:03:03.599 --> 00:03:09.599
+they're going to be talking to us
+about code.
+
+00:03:09.599 --> 00:03:13.519
+Excuse me, I realize I hadn't
+set my timer.
+
+00:03:13.519 --> 00:03:18.000
+Here we are.
+
+00:03:18.000 --> 00:03:20.543
+So a simple macro syntax is
+
+00:03:20.543 --> 00:03:22.239
+going to generate
+
+00:03:22.239 --> 00:03:25.920
+something that is implicitly confusing
+
+00:03:25.920 --> 00:03:27.657
+to somebody that knows the syntax
+
+00:03:27.657 --> 00:03:28.988
+of Emacs Lisp well.
+
+00:03:28.988 --> 00:03:30.785
+We see something like this
+
+00:03:30.785 --> 00:03:32.784
+and a veteran eye says
+
+00:03:32.784 --> 00:03:36.239
+"That x isn't quoted. What's going on?"
+
+00:03:36.239 --> 00:03:39.840
+but it can be hard to miss.
+
+00:03:39.840 --> 00:03:43.040
+A lot of the functions (as we'll talk
+
+00:03:43.040 --> 00:03:46.640
+about in a moment) that are built
+into Emacs
+
+00:03:46.640 --> 00:03:48.572
+really are macros, so a lot of
+
+00:03:48.572 --> 00:03:50.480
+Emacs features work this way.
+
+00:03:50.480 --> 00:03:53.040
+It might be scary, but we have to look at
+
+00:03:53.040 --> 00:03:54.640
+it closely if we really want to get
+
+00:03:54.640 --> 00:03:58.400
+friendly with Emacs.
+
+00:03:58.400 --> 00:04:01.439
+Let's just jump right into defmacro,
+
+00:04:01.439 --> 00:04:03.920
+which is our key entry point.
+
+00:04:04.720 --> 00:04:05.833
+The notes from this talk
+
+00:04:05.833 --> 00:04:09.420
+include the link to that,
+
+00:04:09.420 --> 00:04:12.000
+which... Definitely
+
+00:04:12.000 --> 00:04:14.640
+read through a couple of times.
+
+00:04:14.640 --> 00:04:16.000
+That may take you through
+
+00:04:16.000 --> 00:04:19.440
+into the cl-def macro, which adds
+
+00:04:19.440 --> 00:04:23.440
+the Common Lisp extensions.
+
+00:04:23.440 --> 00:04:28.080
+Definitely challenging.
+
+00:04:28.080 --> 00:04:30.560
+I've struggled there,
+
+00:04:30.560 --> 00:04:31.759
+as we'll take a look at
+
+00:04:31.759 --> 00:04:34.800
+in a moment.
+
+00:04:34.800 --> 00:04:36.266
+So I haven't played too much with
+
+00:04:36.266 --> 00:04:38.320
+cl-maclet. Perhaps success in
+
+00:04:38.320 --> 00:04:40.804
+in that keyword space
+
+00:04:40.804 --> 00:04:44.320
+and figuring out what
+the right balance is there
+
+00:04:44.320 --> 00:04:46.000
+will give me the confidence to try
+
+00:04:46.000 --> 00:04:51.680
+some more lexical macros.
+
+00:04:51.680 --> 00:04:53.402
+Let me also briefly introduce
+
+00:04:53.402 --> 00:04:55.134
+the comma (,) and back quote (`).
+
+00:04:55.134 --> 00:04:57.389
+If you have allowed your eyes
+
+00:04:57.389 --> 00:04:59.321
+to cross when you see these,
+
+00:04:59.321 --> 00:05:03.113
+that's not a shameful,
+shameful thing.
+
+00:05:03.113 --> 00:05:06.080
+It's confusing, and we should be
+
+00:05:06.080 --> 00:05:07.543
+alerting each other
+
+00:05:07.543 --> 00:05:09.520
+when we stick macros in,
+
+00:05:09.520 --> 00:05:11.199
+often by putting them in
+
+00:05:11.199 --> 00:05:12.255
+different library spaces
+
+00:05:12.255 --> 00:05:14.160
+for complicated projects,
+
+00:05:14.160 --> 00:05:17.520
+or otherwise warning people
+
+00:05:17.520 --> 00:05:19.520
+that this is not an interactive function,
+
+00:05:19.520 --> 00:05:21.919
+even if you get away
+with using it like one.
+
+00:05:22.639 --> 00:05:26.000
+Watch your back.
+
+00:05:26.000 --> 00:05:32.800
+The manual itself talks about macros
+
+00:05:32.800 --> 00:05:35.840
+as being a way of evaluating,
+
+00:05:35.840 --> 00:05:39.993
+as being an evaluator that will take
+
+00:05:39.993 --> 00:05:42.800
+our Emacs Lisp expression
+
+00:05:42.800 --> 00:05:44.800
+and the set of forms that
+
+00:05:44.800 --> 00:05:47.590
+will feed to it our code,
+
+00:05:48.960 --> 00:05:50.792
+but it also provides us with
+
+00:05:50.792 --> 00:05:53.467
+this concept of an environment.
+
+00:05:53.467 --> 00:05:57.027
+That's really where the power
+comes in.
+
+00:05:57.027 --> 00:05:58.240
+Through that, we can have
+
+00:05:58.240 --> 00:06:00.080
+lexical variables and
+
+00:06:00.080 --> 00:06:03.199
+think about--bring in some of the
+
+00:06:03.199 --> 00:06:06.400
+capabilities that
+
+00:06:06.400 --> 00:06:09.759
+can be harder to reach with
+
+00:06:09.759 --> 00:06:13.840
+a pure declarative statement that
+
+00:06:13.840 --> 00:06:21.440
+doesn't allow for top level
+
+00:06:21.440 --> 00:06:28.639
+asynchronous... Asynchronicity...
+
+00:06:28.639 --> 00:06:31.950
+I'm gonna basically
+
+00:06:33.520 --> 00:06:35.577
+ignore the byte-compilation phase
+
+00:06:35.577 --> 00:06:36.880
+for this talk
+
+00:06:36.880 --> 00:06:38.463
+in order to have any prayer
+
+00:06:38.463 --> 00:06:39.919
+of getting through it in the
+
+00:06:39.919 --> 00:06:43.600
+remaining 9 or 11 minutes or whatever.
+
+00:06:43.600 --> 00:06:50.441
+But suffice to say,
+that's a scary space,
+
+00:06:50.441 --> 00:06:52.240
+and that's really
+
+00:06:52.240 --> 00:06:53.800
+the thing that you want to
+
+00:06:53.800 --> 00:06:55.277
+start learning about
+
+00:06:55.277 --> 00:06:57.199
+as you think about
+
+00:06:57.199 --> 00:07:02.160
+taking macros on in earnest.
+
+00:07:02.160 --> 00:07:05.919
+Coming back to the comma syntax,
+
+00:07:05.919 --> 00:07:09.759
+then, having given ourselves a
+
+00:07:09.759 --> 00:07:12.479
+working definition for the Emacs Lisp
+
+00:07:12.479 --> 00:07:14.479
+runtime environment, then we can say that
+
+00:07:14.479 --> 00:07:15.840
+macros are going to
+
+00:07:15.840 --> 00:07:21.120
+inject code back into that stream,
+
+00:07:21.120 --> 00:07:25.280
+whereas backquote (`)
+
+00:07:25.280 --> 00:07:28.479
+is going to give code back.
+
+00:07:28.479 --> 00:07:31.919
+to the stream--or interject, sorry,
+
+00:07:31.919 --> 00:07:33.632
+it's going to interject
+
+00:07:33.632 --> 00:07:35.360
+back into the stream.
+
+00:07:35.360 --> 00:07:39.840
+Sort of an exclamatory "Excuse me,
+
+00:07:39.840 --> 00:07:46.966
+I'd like to have a value here."
+We can take that value
+
+00:07:46.966 --> 00:07:48.639
+from the environment as it exists
+
+00:07:48.639 --> 00:07:54.160
+when our macro is evaluated.
+
+00:07:54.160 --> 00:07:56.003
+Backquote, on the other hand,
+
+00:07:56.003 --> 00:08:00.560
+takes the result from that
+
+00:08:00.560 --> 00:08:02.201
+and returns it back to the stream
+
+00:08:02.201 --> 00:08:03.467
+for evaluation at the
+
+00:08:03.467 --> 00:08:05.680
+processing level that invoked us.
+
+00:08:05.680 --> 00:08:08.720
+So in other words, perhaps back up to
+
+00:08:08.720 --> 00:08:10.960
+a top-level eval expression where our
+
+00:08:10.960 --> 00:08:16.720
+macro is invoked.
+
+00:08:20.080 --> 00:08:22.560
+I'm going to briefly bring
+
+00:08:22.560 --> 00:08:23.759
+you back to the game
+
+00:08:23.759 --> 00:08:27.120
+for just a moment.
+
+00:08:30.240 --> 00:08:32.479
+I won't linger on this slide,
+
+00:08:32.479 --> 00:08:37.039
+but briefly: this is a
+
+00:08:37.039 --> 00:08:41.615
+role-playing, pen and pencil,
+
+00:08:41.615 --> 00:08:43.829
+physical dice tradition
+
+00:08:43.829 --> 00:08:46.320
+that dates back a long time
+
+00:08:46.320 --> 00:08:48.080
+from a technology perspective.
+
+00:08:48.080 --> 00:08:50.727
+It's old in the same way
+
+00:08:50.727 --> 00:08:58.560
+that other tools that I like
+are old.
+
+00:08:58.560 --> 00:09:00.185
+It's simple to understand.
+
+00:09:00.185 --> 00:09:01.873
+I can communicate a lot with it
+
+00:09:01.873 --> 00:09:03.952
+with a simple amount of typing
+
+00:09:03.952 --> 00:09:09.120
+or scribbling something
+on a piece of paper.
+
+00:09:09.120 --> 00:09:13.500
+It has a complicated problem space
+of its own.
+
+00:09:13.500 --> 00:09:15.519
+Again, I don't want to
+
+00:09:15.519 --> 00:09:18.212
+get too much into the game here,
+
+00:09:18.212 --> 00:09:20.177
+but in this talk,
+
+00:09:20.177 --> 00:09:22.590
+for the last five minutes,
+
+00:09:22.590 --> 00:09:24.751
+I'll focus on the process
+
+00:09:24.751 --> 00:09:26.640
+that we took to
+
+00:09:26.640 --> 00:09:29.190
+automate getting data out of
+
+00:09:29.190 --> 00:09:31.564
+the Org Mode tables
+which eventually
+
+00:09:31.564 --> 00:09:33.855
+(as we'll talk about more
+tomorrow)
+
+00:09:33.855 --> 00:09:36.000
+are used to draw
+
+00:09:36.000 --> 00:09:39.440
+game maps and other things.
+
+00:09:39.440 --> 00:09:42.543
+Here I talk about why we did
+that.
+
+00:09:42.543 --> 00:09:45.279
+I'm going to skip briefly past that,
+
+00:09:45.279 --> 00:09:49.360
+and say instead that at a high level,
+
+00:09:49.360 --> 00:09:51.440
+it's symbolic informatics.
+
+00:09:51.440 --> 00:09:53.519
+We're giving a symbolic name
+
+00:09:53.519 --> 00:09:58.080
+to a tile set,
+
+00:10:02.000 --> 00:10:04.000
+and then assigning that tile set some
+
+00:10:04.000 --> 00:10:04.840
+some characteristics
+
+00:10:04.840 --> 00:10:06.820
+like physical speeds, screen space
+
+00:10:06.820 --> 00:10:08.399
+(a variable that we might
+
+00:10:08.399 --> 00:10:12.800
+want to swap in), and so forth.
+
+00:10:12.800 --> 00:10:15.200
+You know, our project rests heavily on
+
+00:10:15.200 --> 00:10:21.040
+Org Mode and its
+fundamental capabilities.
+
+00:10:21.040 --> 00:10:24.000
+The code I'm going to show here
+
+00:10:28.320 --> 00:10:31.360
+is focused around a sticky
+
+00:10:31.360 --> 00:10:32.380
+problem space in
+
+00:10:32.380 --> 00:10:33.861
+information technology.
+
+00:10:33.861 --> 00:10:38.240
+I'm a professional software engineer
+
+00:10:38.240 --> 00:10:40.362
+turned technology architect.
+
+00:10:40.362 --> 00:10:43.495
+I support the websites for
+
+00:10:43.495 --> 00:10:46.533
+a recognizable financial services brand
+
+00:10:46.533 --> 00:10:48.500
+that I don't identify
+
+00:10:48.500 --> 00:10:50.720
+just so I don't accidentally end up
+
+00:10:50.720 --> 00:10:54.399
+inadvertently misrepresenting my firm
+
+00:10:54.399 --> 00:10:56.456
+in some financial perspective
+
+00:10:56.456 --> 00:10:57.760
+if I let some other
+
+00:10:57.760 --> 00:11:03.300
+companies' name slip, or my own.
+
+00:11:03.300 --> 00:11:07.700
+It's certainly no representation
+
+00:11:07.700 --> 00:11:11.279
+of an opinion other than my own.
+
+00:11:18.800 --> 00:11:22.720
+So ETL has to do with moving data around.
+
+00:11:22.720 --> 00:11:26.240
+We have the idea of
+
+00:11:26.240 --> 00:11:29.200
+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.
+
+00:11:33.600 --> 00:11:35.630
+Before the pipeline starts, okay,
+
+00:11:35.630 --> 00:11:36.886
+we've got a state where we think
+
+00:11:36.886 --> 00:11:38.560
+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
+
+00:11:57.724 --> 00:11:59.680
+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
+
+00:12:39.020 --> 00:12:41.680
+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.
-- 
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