WEBVTT
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[MUSIC PLAYING]
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[MUSIC PLAYING]
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And so this little application--
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well, I'll skip that and just kind of jump right
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into my thesis for those of you that
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might be planning to duck out for the RMS talk,
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starting in a little bit.
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So essentially, my thesis here is really
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that the Emacs toolchain can easily
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be combined with other skills and used in kind of a Unix
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paradigm of having sort of different tools
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to do different steps.
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We might actually use the same tool
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to implement a couple of steps.
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But with that paradigm, each step
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is an individual item that can be sort of dropped in
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and replaced.
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So over the course of the talk, hopefully I'll
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come back to that thesis.
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But I'll now jump back and start walking through what is
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orgvm?
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So this is a very simple proof of concept program.
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We'll just jump over to perhaps a prettier view of the
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source
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code for it.
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This is implemented-- oops.
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There's some cruft, I think, in my local.
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All right, so there's config block at the top.
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And we'll be jumping back and forth
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between the code and the documentation.
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So the first thing I want to point out
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is that this is written in Node.js.
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But I think you'll find it'd be pretty trivial to implement
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in any language.
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Certainly, you're more than welcome to use this.
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I'd be happy to accept your patches or feature requests
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and things like that.
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Of course, bug reports.
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But I'd also encourage others to roll their own.
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You might well come up with a different version of this
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that's even cooler.
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And we can learn from each other.
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If you heard one of my talks before,
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you probably recognize a common theme.
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I'm a big fan of head-first development
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as a way to get invested in both the tool chain and a
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culture.
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All right, so let's come back to orgvm.
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First of all, we'll start with the itch I was trying to
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scratch.
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I wanted to be able to quickly use a web browser
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to browse my org documents.
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It's particularly handy when the documents are full of
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cross
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links to each other.
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That meant I wanted to automatically export,
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particularly to HTML.
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But it made sense for me to include Markdown, PDF,
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or whatever format I want.
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Because many times, I'm going to look at that file
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and then pop it into an email or upload it somewhere.
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And then finally, it should be, therefore,
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pretty easy to download the document rather than view it
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once I'm done.
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So let's just run a quick demo.
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You'll see I'm still a Windows user.
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Yeah, I'm working on it.
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So all right, first thing that we're going to do
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is fire up the program.
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Actually, for simplicity, let's just
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admit we live in a DOS world.
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And as you can see, there's not much to it
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to get the application running.
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So with that done, then, I can run out to my local host.
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And we'll just start by plugging in the name of an org file
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.
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So I've got a little org file that I prepared that just
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kind
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of provides a proof of concept to this.
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And you can see, as imagined, we're automatically
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turning that org file.
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Let's just take a quick look at it.
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And here's that file now.
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But you can see nothing up my sleeve.
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This is a very basic org file that I
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use for testing this program.
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Images work.
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We've got some nicely syntax highlighted code
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blocks in a couple different languages.
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And not really that much going on there.
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All right, let's come back to the documentation.
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I pretty well covered this, I think.
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But you'll need a relatively recent version of Emacs.
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I haven't taken any pains to make this backward compatible.
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To be fair, I haven't tested it extensively.
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It may well work on Emacs 26 or older versions.
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I'm personally running 27.1 and 28,
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as well as recent builds of 29.
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There's some quick start instructions here,
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which I'm going to take as read.
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You probably saw the key element of this, which
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involves starting the program.
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You do-- I will call out Yale.
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If you're trying to play with this yourself,
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don't forget to run the npm install command.
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That'll bring in express.js, which the JavaScript we're
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about to look at is built on.
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So let's just take a look at the usage patterns real quick.
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To use this, we're simply giving the document name
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without the org extension in whatever file path--
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or I'm sorry, whatever we've configured the server
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to run on, in this case, port 3000.
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I also want to call attention to the fact
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that nothing in this program protects you
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from damaging yourself.
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This isn't meant as a production capability.
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This is something that's used to publish your own note
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files
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and roll them up to yourself.
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That's something I'll definitely look at adding,
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but I want people to be careful of it
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while this is in an alpha state.
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So the default response is HTML, and we saw that here.
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But we also can modify the response format.
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We're currently supporting HTML, Markdown, and PDF.
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And that's really enough to select a different format.
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That's really nothing more than adding--
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[AUDIO OUT]
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--type, OK.
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Not sure what's going on there.
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OK, well, there goes my demo.
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Shows me for doing my talk live.
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But this, fortunately, this error message
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is a nice segue to the part of the talk
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that I'd really like to focus on,
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hopefully bringing me back to that thesis.
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So as we start to look at code, what we're looking for
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is really this Emacs Lisp that's getting generated here.
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And you'll notice that's the stuff
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I thought was important to produce as diagnostics
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for the programs running as well.
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So spoiler, this e-lisp is dynamically
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generated by the program.
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And that's really the core of the way
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org VM or my org VM works.
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So this should look pretty similar to the view of the code
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we had a moment ago.
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You can see I've got some bases.
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This is all hard-coded into the program,
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nothing fancy going on here.
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The debug is simply controlling that diagnostic output
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that we looked at.
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There's some other, hopefully fairly self-explanatory
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programs or properties, where to find Emacs and so forth.
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And then finally, we come in to the meat of it,
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the variables that are used to control what e-lisp we
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can generate dynamically.
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So here, we're controlling the extension
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that it should look for org files.
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Hopefully not too many people out there
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with a weird extension for the org files,
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but this should support that.
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I'm afraid that is something I've been known to do.
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Then we define a list of additional export types.
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Here's one that ought to work.
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Let's take a look at type equals org.
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And, aha, it's giving us the file.
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So I'm not going to open that up,
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but now we can see that that's definitely
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working for certain versions of working.
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So this list of type parameters is
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controlling the supported types.
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Hopefully it should be fairly easy to add in different ones
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.
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The fancy footwork here is just a list
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of the types that we're going to be using.
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The fancy footwork here involves, first of all,
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there's the extension and the MIME type.
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That's, as you might guess, used to control the response
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content
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type.
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We also have this replace variable.
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This prevents-- there's an optimization
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to send an existing PDF or HTML file if that's already
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there, but only if the original source org file hasn't
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been modified since.
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This replace effectively can turn that off.
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If I remove the replace equals true attribute,
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then I'll be prevented from overwriting that.
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In other words, I'll always send a cached version.
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That might be helpful if, for example, you've
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got hand-tuned PDFs and you don't want to accidentally
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overwrite them.
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All right, let's get into the code a little bit more.
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I'm going to skip past the really good stuff
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and jump into the boring parts so that we have them
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as context.
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Here's the default path.
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And it is going to send me the readme from the project--
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from the project repo if I don't specify a path.
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And then we have a couple of different endpoints
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that we support.
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We'll come back to this first one.
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For now, let's start with the more normal one, which
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is just giving us a file name.
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So we can see we start by figuring out
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what the physical file name should be called.
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And assuming that that exists--
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sorry, I've confused myself.
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So this is the caching or the optimization
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that I mentioned, sending the existing file.
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This file exists is where the optimization is
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that regenerates the file if the source
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or document for the HTML generator has changed.
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Again, this is a short talk, so I'm not
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going to go into all the nuances of this JavaScript code.
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It's pretty far from an Emacs-related thing.
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So with that said, then, the rest of this program
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is really mostly just handling the different error.
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I didn't understand that type.
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I don't know the document.
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I failed.
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Otherwise, there's the caching.
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And here's really where things get interesting,
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where we've generated some ELISP,
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and then we're calling Emacs with that ELISP.
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If everything works, we'll send the file.
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If it doesn't, we'll send the 500.
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And we've already seen the 500, so we know that works.
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All right, let's get to the interesting part.
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Sorry, one more footnote.
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There is a capability built in that will
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allow us to execute an org block.
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Let's see if that's working in our local.
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I'll remind myself how to do it.
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It's run.
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I think it's called test.
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And that's returning a 500.
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I'm suspecting that's running because I'm running
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in command instead of bash.
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Oh, yeah, so the failure is happening
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after I generate the ELISP.
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I'm pretty confident that is what the actual problem is.
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If we have time, I'll jump back over there
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and relaunch it in mingity-bash.
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And we can see it actually work.
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But this works pretty well for me on my work laptop.
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I didn't have to make any changes to it.
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So I have a fairly high amount of confidence,
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at least in trivial cases, this works pretty well.
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All right, so what I actually wanted to talk about today--
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and I'm going to be kind of hand-waving around this ES5
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class that I've got and kind of the way that works.
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Hopefully, this will be pretty familiar to you
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if you are a JavaScript programmer.
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The interesting stuff comes when we want to build some LISP
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.
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Here, you can see that I really don't have a whole lot of
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code
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around formatting LISP.
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You can see that I've special-cased
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whether the arguments that were passed
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happen to be a function.
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If they are, I'm going to call that function.
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And then the result will be formatted as LISP.
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So this would be a recursive call here.
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Otherwise, I'm just going to return the arguments.
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Sorry, otherwise, I will slap a pair of parentheses
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around the result of walking that list
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if I get formatting each element of the list of arguments
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that this format LISP process calls
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and separating them with spaces.
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So in short form, this program walks through a list.
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If the list it receives is a function,
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it calls that function.
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Once that's handled or otherwise,
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we simply walk the list, taking the arguments,
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concatenating them on strings, and finally,
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wrap the results in parentheses.
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So what I didn't mention there but might be obvious
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is if I have a nested list, the inner list
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will be subjected to the same treatment.
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So this is a recursive sort of algorithm.
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All right, so now when I go to export,
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actually, in the interest of time,
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I'm going to avoid walking through that piece of code
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and let's focus instead on the more interesting part
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of how that LISP gets encoded.
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So coming back to the PDF is a good example here
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because it's got a special case.
00:17:10.320 --> 00:17:14.280
You can see I've specified this export fun or export
00:17:14.280 --> 00:17:15.320
function.
00:17:15.320 --> 00:17:19.560
That's a property none of these other types have.
00:17:22.400 --> 00:17:27.280
And you can see it contains a meat LISP telling us
00:17:27.280 --> 00:17:29.760
how to call the export for it.
00:17:29.760 --> 00:17:32.680
Let's go see how that's used.
00:17:32.680 --> 00:17:35.720
At the very end of what I just skipped over,
00:17:35.720 --> 00:17:40.600
the detailed how the org export process works,
00:17:40.600 --> 00:17:45.040
you'll see that I am ending with a step
00:17:45.040 --> 00:17:48.000
to call the export function.
00:17:48.000 --> 00:17:54.520
Here, I look to see whether I have an export function
00:17:54.520 --> 00:17:55.400
property.
00:17:55.400 --> 00:18:00.920
If I do, I call that function.
00:18:00.920 --> 00:18:06.760
And if I don't, I build this list with the default org
00:18:06.760 --> 00:18:14.320
export to file function using the file name and an output
00:18:14.320 --> 00:18:15.640
file name.
00:18:15.640 --> 00:18:18.480
So this, hopefully, is pretty familiar to anybody
00:18:18.480 --> 00:18:22.950
that's manually messed around with calling org export to
00:18:22.950 --> 00:18:23.560
file.
00:18:23.560 --> 00:18:25.800
If it isn't, you can pretty well trust me for it.
00:18:25.800 --> 00:18:28.280
There's nothing very special going on.
00:18:28.280 --> 00:18:30.760
This looks rather like--
00:18:30.760 --> 00:18:37.240
poor example there.
00:18:37.240 --> 00:18:38.960
Let's go back to our markdown.
00:18:38.960 --> 00:18:46.320
[AUDIO OUT]
00:18:46.320 --> 00:18:47.720
And there, we can see--
00:18:47.720 --> 00:18:49.840
- I'm going to make a quick announcement.
00:18:49.840 --> 00:18:50.760
Can you hear me?
00:18:50.760 --> 00:18:52.480
- Yes, go for it.
00:18:52.480 --> 00:18:54.280
- OK, let me just show my face.
00:18:54.280 --> 00:18:55.400
Oh, I'm not showing my face.
00:18:55.400 --> 00:18:55.640
Damn it.
00:18:55.640 --> 00:18:57.000
OK, I'll make the announcement.
00:18:57.000 --> 00:18:58.600
You won't see my face quite yet.
00:18:58.600 --> 00:19:00.360
We are about to get started.
00:19:00.360 --> 00:19:02.440
Well, we actually just got started on dev
00:19:02.440 --> 00:19:06.040
with the talk by RMS.
00:19:06.040 --> 00:19:08.920
So if you want to hop over to watch the talk by RMS,
00:19:08.920 --> 00:19:09.760
feel free to do so.
00:19:09.760 --> 00:19:12.240
Otherwise, we will be continuing on Gen with Corwin
00:19:12.240 --> 00:19:14.520
to finish his talk and have a Q&A. Corwin,
00:19:14.520 --> 00:19:16.080
you can feel free to go now.
00:19:16.080 --> 00:19:18.560
- OK, bye, everybody.
00:19:18.560 --> 00:19:22.800
And for those sticking around, I'm
00:19:22.800 --> 00:19:25.040
just going to keep pressing on with this.
00:19:25.040 --> 00:19:30.240
In fact, I'm going to dive back into the part
00:19:30.240 --> 00:19:35.400
that I skipped here, which is the rest of how
00:19:35.400 --> 00:19:37.400
this export functionality works.
00:19:37.400 --> 00:19:41.400
So just to make sure the dot is tied together,
00:19:41.400 --> 00:19:44.440
the core of how this program works
00:19:44.440 --> 00:19:49.320
is generating some ELISP and then passing it
00:19:49.320 --> 00:19:51.680
to Emacs in batch mode.
00:19:51.680 --> 00:19:53.280
So if that wasn't perfectly clear,
00:19:53.280 --> 00:19:57.240
that's really what's going on with this program.
00:19:57.240 --> 00:19:59.240
The rest of the implementation is just
00:19:59.240 --> 00:20:01.840
a way to do that or certain features that
00:20:01.840 --> 00:20:08.440
are supported in that generated ELISP, if you will.
00:20:08.440 --> 00:20:11.720
So this is, you could say, the minimum implementation
00:20:11.720 --> 00:20:16.220
I could come up with to create a web server for my local
00:20:16.220 --> 00:20:16.560
org
00:20:16.560 --> 00:20:17.320
documents.
00:20:17.320 --> 00:20:24.440
And I will also interrupt myself to just pull up
00:20:24.440 --> 00:20:28.040
the etherpad real quick.
00:20:28.040 --> 00:20:29.600
Actually, if somebody is listening
00:20:29.600 --> 00:20:34.720
and can share a link to that, I closed my browser window
00:20:34.720 --> 00:20:36.400
with my links in it.
00:20:36.400 --> 00:20:44.520
But sure, I'm happy to take questions at any point, Leo,
00:20:44.520 --> 00:20:48.480
if there are any questions for me.
00:20:48.480 --> 00:20:49.720
Are you hanging out with me?
00:20:49.720 --> 00:20:53.360
Instead of watching RMS, you can go.
00:20:53.360 --> 00:20:54.600
I'm teasing.
00:20:54.600 --> 00:20:58.840
No, I mean, we know that some people can
00:20:58.840 --> 00:21:00.000
have both streams open.
00:21:00.000 --> 00:21:01.560
It's fine.
00:21:01.560 --> 00:21:03.320
And right now, it's not the Q&A with RMS.
00:21:03.320 --> 00:21:04.640
It's just the presentation.
00:21:04.640 --> 00:21:07.040
So feel free to hang out a little longer
00:21:07.040 --> 00:21:09.080
if you just want the live stuff.
00:21:09.080 --> 00:21:09.960
Don't worry about it.
00:21:09.960 --> 00:21:10.760
You're fine.
00:21:10.760 --> 00:21:13.720
Yeah, and forgive me, everybody.
00:21:13.720 --> 00:21:16.280
If you were hoping for a quick, succinct talk,
00:21:16.280 --> 00:21:18.960
I happen to know I was going to be opposite RMS.
00:21:18.960 --> 00:21:23.240
So I awarded myself the liberty of rambling.
00:21:23.240 --> 00:21:26.840
So if you do have a question, something that I alluded to
00:21:26.840 --> 00:21:29.800
and haven't come back to yet, you should, by all means,
00:21:29.800 --> 00:21:30.320
prompt me.
00:21:30.320 --> 00:21:33.800
A comment I might do--
00:21:33.800 --> 00:21:35.400
I'm just giving you a little heads up.
00:21:35.400 --> 00:21:38.640
I might need to go help at some point of a dev.
00:21:38.640 --> 00:21:43.120
So if I need to do so, I will let you know right now
00:21:43.120 --> 00:21:44.280
inside the BBB room.
00:21:44.280 --> 00:21:46.160
And you'll be on your own to manage the chat.
00:21:46.160 --> 00:21:47.960
And you can just talk backstage to us
00:21:47.960 --> 00:21:50.240
to manage what we do with the stream, OK?
00:21:50.240 --> 00:21:52.160
Yep, that should be no problem at all.
00:21:52.160 --> 00:21:53.760
I've got my pad up now.
00:21:53.760 --> 00:21:55.160
Thank you, Chancellor.
00:21:55.160 --> 00:21:58.040
And I'm sorry about butchering your name there.
00:21:58.040 --> 00:22:03.360
And yep, I've got my chat open.
00:22:03.360 --> 00:22:06.400
And I think I'm pretty well set to self-manage.
00:22:06.400 --> 00:22:07.640
Oh, I don't have a camera on.
00:22:07.640 --> 00:22:09.360
So you can't see me giving you the thumbs up.
00:22:09.360 --> 00:22:09.860
OK, good.
00:22:09.860 --> 00:22:16.000
All right, so let's just walk through,
00:22:16.000 --> 00:22:18.400
because it's sort of an interesting code.
00:22:18.400 --> 00:22:20.560
Let's just take a look real quick
00:22:20.560 --> 00:22:24.720
at how we generated our e-list here,
00:22:24.720 --> 00:22:26.520
because it is--
00:22:26.520 --> 00:22:27.640
there we go.
00:22:27.640 --> 00:22:29.240
It is a little bit interesting.
00:22:29.240 --> 00:22:32.040
So here is the method.
00:22:32.040 --> 00:22:34.080
So I didn't get into detail on this.
00:22:34.080 --> 00:22:37.680
But there's an ES5 class that represents an org mode
00:22:37.680 --> 00:22:38.920
document.
00:22:38.920 --> 00:22:42.260
It has the static debug property that, as you might imagine
00:22:42.260 --> 00:22:42.400
,
00:22:42.400 --> 00:22:45.480
can be overridden by that debug setting
00:22:45.480 --> 00:22:48.440
we looked at in the defaults.
00:22:48.440 --> 00:22:51.440
We also have a static variable that--
00:22:51.440 --> 00:22:57.440
a static property that does nothing more than getting
00:22:57.440 --> 00:23:00.360
the path to emacs out of those defaults.
00:23:00.360 --> 00:23:02.120
Similarly, we have a class method
00:23:02.120 --> 00:23:09.520
to spawn out an emacs, as I mentioned, in batch mode,
00:23:09.520 --> 00:23:12.720
eval-ing some arbitrary list that's passed in.
00:23:12.720 --> 00:23:20.480
All right, so the type--
00:23:20.480 --> 00:23:23.080
this is where things start to get interesting.
00:23:23.080 --> 00:23:26.480
So this is an implementation detail,
00:23:26.480 --> 00:23:30.040
but-- that it's written as a static method.
00:23:30.040 --> 00:23:32.160
But essentially, what's going on here
00:23:32.160 --> 00:23:34.840
is looking up from that type list
00:23:34.840 --> 00:23:37.480
to try to find a type that's passed in,
00:23:37.480 --> 00:23:41.240
and that's returning one of these blocks.
00:23:41.240 --> 00:23:44.800
Let's say I requested HTML, which would be the default.
00:23:44.800 --> 00:23:48.760
Then I'm going to get this set of properties back.
00:23:50.760 --> 00:23:50.760
00:23:50.760 --> 00:23:51.260
All right.
00:23:51.260 --> 00:24:04.200
Essentially, this program generates a program
00:24:04.200 --> 00:24:10.840
or a little block of executable elisp.
00:24:10.840 --> 00:24:15.920
However, in some cases, where if the load path has
00:24:15.920 --> 00:24:20.920
been customized in that type block,
00:24:20.920 --> 00:24:25.000
or I think that's the only case I supported.
00:24:25.000 --> 00:24:28.960
There was another complexity I removed.
00:24:28.960 --> 00:24:32.000
So in that case, then I can simply
00:24:32.000 --> 00:24:33.560
replace that program with a let.
00:24:33.560 --> 00:24:41.680
Either way, I'm going to have everything I generate
00:24:41.680 --> 00:24:45.840
be encapsulated in a single block.
00:24:45.840 --> 00:24:49.240
The-- then I'm calling that format list process
00:24:49.240 --> 00:24:52.760
that we talked about, appending to that--
00:24:52.760 --> 00:25:01.680
or inserting into, you could say, the outer scope.
00:25:01.680 --> 00:25:05.000
And we start by finding the file.
00:25:05.000 --> 00:25:11.400
We then load any libraries that might be needed.
00:25:11.400 --> 00:25:13.520
In some cases, the type might not
00:25:13.520 --> 00:25:15.160
have any external libraries.
00:25:15.160 --> 00:25:18.440
So we just-- so that's a no op.
00:25:18.440 --> 00:25:24.120
And then finally, we're going to execute
00:25:24.120 --> 00:25:27.160
that logic I mentioned before about selecting
00:25:27.160 --> 00:25:30.160
either the default or export to file,
00:25:30.160 --> 00:25:36.200
or else whatever elisp we've staged for exporting
00:25:36.200 --> 00:25:38.160
that particular file type.
00:25:38.160 --> 00:25:41.480
And again, in the case of PDF, there's
00:25:41.480 --> 00:25:46.240
a special function that's used to trigger that export.
00:25:46.240 --> 00:25:49.160
Or you may be aware that that's a little more complicated.
00:25:49.160 --> 00:25:50.840
There's intermediate forms there.
00:25:50.840 --> 00:25:56.760
All right.
00:25:56.760 --> 00:26:01.320
So just reminding myself if there's anything else
00:26:01.320 --> 00:26:03.760
I have to cover on background.
00:26:03.760 --> 00:26:07.440
And I think that pretty well covers the basics.
00:26:07.440 --> 00:26:09.880
All right, let's look at that source block execute.
00:26:09.880 --> 00:26:14.600
This is the other use of the format list function.
00:26:14.600 --> 00:26:16.800
So here, rather than looking at the type
00:26:16.800 --> 00:26:24.720
and passing that through our org export method,
00:26:24.720 --> 00:26:29.080
and then that type is used to get the list
00:26:29.080 --> 00:26:30.840
that we want to create.
00:26:30.840 --> 00:26:37.600
In the case of source block execute,
00:26:37.600 --> 00:26:40.520
we're kind of rolling it a lot more by hand.
00:26:40.520 --> 00:26:43.920
So this gives us a good chance to sort of unwind
00:26:43.920 --> 00:26:49.600
how that list looks when it's staged as JavaScript data.
00:26:49.600 --> 00:26:52.760
So here again, I wrap everything in a progon.
00:26:52.760 --> 00:26:58.480
I start by preventing an interactive prompt
00:26:58.480 --> 00:27:01.240
for the Babel execution.
00:27:01.240 --> 00:27:04.960
And then we load languages.
00:27:04.960 --> 00:27:12.240
This relates to another piece of our configuration
00:27:12.240 --> 00:27:17.600
where we've specified a set of languages
00:27:17.600 --> 00:27:19.920
that it's OK to execute.
00:27:19.920 --> 00:27:24.120
So if that type isn't in this list,
00:27:24.120 --> 00:27:28.800
then we won't be able to execute it in line
00:27:28.800 --> 00:27:32.720
through our trivial little web server.
00:27:32.720 --> 00:27:33.640
All right.
00:27:33.640 --> 00:27:40.600
With that done, then, loading the selected language,
00:27:40.600 --> 00:27:43.960
we then once again open the file.
00:27:43.960 --> 00:27:46.360
And we're-- whoops.
00:27:46.360 --> 00:27:51.800
Let bind a return value, which is
00:27:51.800 --> 00:27:55.840
calculated by using org source block execute on the name
00:27:55.840 --> 00:27:58.040
of the block that's given.
00:27:58.040 --> 00:28:05.160
And then we use a temp buffer to write that out
00:28:05.160 --> 00:28:06.640
to a temporary file.
00:28:06.640 --> 00:28:08.440
This is actually a little clumsy,
00:28:08.440 --> 00:28:12.720
but I haven't put the effort in to have this written out
00:28:12.720 --> 00:28:17.480
to the standard output cleanly instead of using a temp file
00:28:17.480 --> 00:28:17.840
.
00:28:17.840 --> 00:28:20.480
So under-- this is another example of where it may not
00:28:20.480 --> 00:28:22.520
be production-- well, it definitely
00:28:22.520 --> 00:28:27.680
is not production-worthy code in that under heavy load,
00:28:27.680 --> 00:28:30.860
this would certainly break with collisions on the Babel
00:28:30.860 --> 00:28:32.040
file,
00:28:32.040 --> 00:28:34.120
the name of the Babel file.
00:28:34.120 --> 00:28:37.480
In any case, once we've staged up our ELISP, which is--
00:28:37.480 --> 00:28:42.560
this is basically variable interpolation,
00:28:42.560 --> 00:28:47.680
then we just call emacs on that.
00:28:47.680 --> 00:28:49.720
And if we look down to where that's called,
00:28:49.720 --> 00:28:54.640
you can see that the org Babel file name calculated here.
00:28:54.640 --> 00:28:58.040
[AUDIO OUT]
00:28:58.040 --> 00:29:15.000
Is there a problem?
00:29:15.000 --> 00:29:15.760
No, I'm fine.
00:29:15.760 --> 00:29:18.000
I'm just lost in my code.
00:29:18.000 --> 00:29:19.040
OK, cool.
00:29:19.040 --> 00:29:21.160
Oh, means, oh, I need to intervene.
00:29:21.160 --> 00:29:22.240
What is going on?
00:29:22.240 --> 00:29:23.200
Carry on, please.
00:29:23.200 --> 00:29:24.120
No, I'm fine, Leo.
00:29:24.120 --> 00:29:25.480
Thank you.
00:29:25.480 --> 00:29:27.280
All right, so then--
00:29:27.280 --> 00:29:28.680
so you can see we get--
00:29:28.680 --> 00:29:36.720
we send the Babel file here, which
00:29:36.720 --> 00:29:41.640
is calculated manually.
00:29:41.640 --> 00:29:45.440
A bit sloppy there, since I have essentially the same--
00:29:45.440 --> 00:29:47.000
I have two different places where
00:29:47.000 --> 00:29:52.480
I'm calculating the org doc file in two different ways.
00:29:52.480 --> 00:29:54.720
Have I encouraged you to write your own yet?
00:29:54.720 --> 00:29:56.440
Or send patches.
00:29:56.440 --> 00:30:01.240
All right, so that's pretty much the nuts and bolts
00:30:01.240 --> 00:30:02.400
of this program.
00:30:02.400 --> 00:30:06.720
Let's go back to just seeing if we can't make it run.
00:30:22.120 --> 00:30:22.620
All right.
00:30:22.620 --> 00:30:45.880
All right, well, I apologize for not
00:30:45.880 --> 00:30:49.560
having taken the time to stage my demo this morning.
00:30:49.560 --> 00:30:52.680
I'm going to try to make it better for you.
00:30:52.680 --> 00:30:59.920
But apparently, it's going to be non-trivial
00:30:59.920 --> 00:31:04.520
to make the program work.
00:31:04.520 --> 00:31:07.160
Let's just-- before I completely give up,
00:31:07.160 --> 00:31:13.320
let's go ahead and try our Babel execute.
00:31:13.320 --> 00:31:14.800
And that, too, is failing.
00:31:14.800 --> 00:31:18.040
So there's something unhappy in my local world.
00:31:18.040 --> 00:31:19.040
There it goes.
00:31:19.040 --> 00:31:26.600
But in any case, let's go ahead and just take a look at
00:31:26.600 --> 00:31:28.000
that.
00:31:28.000 --> 00:31:30.640
Let's see.
00:31:30.640 --> 00:31:31.600
Control Enter.
00:31:31.600 --> 00:31:40.200
Let's take a look at that generated ELS
00:31:40.200 --> 00:31:42.840
and compare it to-- whoa--
00:31:42.840 --> 00:31:44.000
and compare it to--
00:31:44.000 --> 00:31:52.400
I'm just going to format this manually,
00:31:52.400 --> 00:31:56.000
because I've forgotten my key bindings to auto-format it.
00:31:56.000 --> 00:32:02.240
There we go.
00:32:02.240 --> 00:32:07.960
All right.
00:32:07.960 --> 00:32:13.120
So now we can see, as promised, there's really
00:32:13.120 --> 00:32:16.200
nothing going on here other than the interpolation
00:32:16.200 --> 00:32:18.640
of the variables in.
00:32:18.640 --> 00:32:24.360
We're inserting-- we're using an insert and write file
00:32:24.360 --> 00:32:27.800
method, which is, again, rather sloppy,
00:32:27.800 --> 00:32:32.040
to generate the text file.
00:32:32.040 --> 00:32:32.880
All right.
00:32:32.880 --> 00:32:34.760
Let's come back to our documentation
00:32:34.760 --> 00:32:39.760
and see if we can put a bow on the project.
00:32:39.760 --> 00:32:43.760
So I hope I've convinced you that this was actually
00:32:43.760 --> 00:32:45.480
rather easy to do.
00:32:45.480 --> 00:32:52.440
The entirety of my index.js file is 262 lines,
00:32:52.440 --> 00:32:59.810
and that includes a good 40 of whitespace and configuration
00:32:59.810 --> 00:33:00.280
.
00:33:03.760 --> 00:33:06.840
It has only one dependency, the Express, which
00:33:06.840 --> 00:33:08.240
really builds the web server.
00:33:08.240 --> 00:33:11.520
Any language you'd rather implement this in
00:33:11.520 --> 00:33:14.120
will have a similar capability for building
00:33:14.120 --> 00:33:16.280
some type of trivial web server.
00:33:16.280 --> 00:33:18.400
And I think you may find--
00:33:18.400 --> 00:33:22.640
I certainly found that a large portion of the code base
00:33:22.640 --> 00:33:28.080
is really making the errors meaningful,
00:33:28.080 --> 00:33:32.420
in that, in some cases, sending an appropriate HTTP status
00:33:32.420 --> 00:33:34.360
based on what happened.
00:33:34.360 --> 00:33:41.160
In other cases-- let's see if I've got an explicit throw
00:33:41.160 --> 00:33:41.520
left
00:33:41.520 --> 00:33:42.640
in here--
00:33:42.640 --> 00:33:45.840
in other cases, just trapping different types
00:33:45.840 --> 00:33:47.440
of failure conditions.
00:33:47.440 --> 00:33:54.000
I'm going to look at my pad, and I do see a question here.
00:33:54.000 --> 00:33:55.120
So let me jump in here.
00:33:55.120 --> 00:33:58.880
[VIDEO PLAYBACK]
00:33:58.880 --> 00:34:00.640
- Cohen, just to make sure, are you switching to Q&A?
00:34:00.640 --> 00:34:02.380
Are you finished with your presentation?
00:34:02.380 --> 00:34:05.260
- Well, as I said, I'm happy to take Q&A throughout.
00:34:05.260 --> 00:34:08.420
But yes, let's say yes to that.
00:34:08.420 --> 00:34:10.900
- OK, so Cohen, what I'm going to need to do now--
00:34:10.900 --> 00:34:12.140
you are in charge of the room.
00:34:12.140 --> 00:34:14.060
We are going to open up the room so
00:34:14.060 --> 00:34:17.220
that if people have questions watching right now on Gen,
00:34:17.220 --> 00:34:18.700
feel free to come in.
00:34:18.700 --> 00:34:22.780
And there was something else I needed to say.
00:34:22.780 --> 00:34:24.620
Yes, Cohen, if there's any problem,
00:34:24.620 --> 00:34:25.700
whisper to us on Mumble.
00:34:25.700 --> 00:34:27.500
So you might want to unmute Mumble
00:34:27.500 --> 00:34:29.620
and be able to listen to us over there.
00:34:29.620 --> 00:34:32.480
- I can't do that, Leo.
00:34:32.480 --> 00:34:36.440
If I unmute, Mumble is going to bleed through.
00:34:36.440 --> 00:34:36.960
- OK, sure.
00:34:36.960 --> 00:34:41.160
Well, if you have any problem, type in emacsconf-org.ch
00:34:41.160 --> 00:34:41.160
annel,
00:34:41.160 --> 00:34:42.520
and we'll be with you, OK?
00:34:42.520 --> 00:34:43.520
- Or I'll PM somebody.
00:34:43.520 --> 00:34:45.760
But I don't anticipate having any problems.
00:34:45.760 --> 00:34:49.040
I'll put something in org when I run out of steam here.
00:34:49.040 --> 00:34:50.400
How's that?
00:34:50.400 --> 00:34:51.160
- Amazing, cool.
00:34:51.160 --> 00:34:53.320
So I will have to leave the room, though.
00:34:53.320 --> 00:34:56.800
I'm leaving the recording going so that we have your Q&A.
00:34:56.800 --> 00:34:58.080
And whenever you're available--
00:34:58.080 --> 00:35:02.180
- I'll shut off the recording when I close the room.
00:35:02.180 --> 00:35:02.980
- OK, great.
00:35:02.980 --> 00:35:04.460
Good luck, Cohen.
00:35:04.460 --> 00:35:06.500
- Thank you.
00:35:06.500 --> 00:35:09.780
All right, and if you're still with me, well, thanks.
00:35:09.780 --> 00:35:13.620
I appreciate that.
00:35:13.620 --> 00:35:16.740
I did offer to be opposite RMS.
00:35:16.740 --> 00:35:20.060
And I'm in no way offended if people do want to jump over,
00:35:20.060 --> 00:35:23.540
especially as that starts to shift over to Q&A.
00:35:23.540 --> 00:35:26.980
I'm taking Leo's leaving as a pretty good indication
00:35:26.980 --> 00:35:28.780
that that's happening now-ish.
00:35:28.780 --> 00:35:34.750
So I totally understand if folks are more excited to do
00:35:34.750 --> 00:35:35.020
that.
00:35:35.020 --> 00:35:37.940
Meanwhile, let me just jump over to the question
00:35:37.940 --> 00:35:38.660
that I received.
00:35:38.660 --> 00:35:46.460
I'll show the pad here so that I save myself
00:35:46.460 --> 00:35:47.860
reading the question out.
00:35:47.860 --> 00:35:48.940
But I'll paraphrase it.
00:35:48.940 --> 00:35:52.660
Why am I not running the web server in emacs?
00:35:52.660 --> 00:35:54.380
That would be a great way to do it.
00:35:54.380 --> 00:35:57.100
I chose to build it in Node.js because that
00:35:57.100 --> 00:35:58.460
was trivially easy for me.
00:36:22.140 --> 00:36:24.780
And then finally, am I using org info.js?
00:36:24.780 --> 00:36:27.540
No, I learned about this essentially at this conference.
00:36:27.540 --> 00:36:30.660
So that's something I'll be learning more about.
00:36:30.660 --> 00:36:32.460
And it could well influence this project.
00:36:32.460 --> 00:36:34.900
[TYPING]
00:36:34.900 --> 00:36:56.180
All right, and thanks for the questions.
00:36:59.020 --> 00:37:02.820
All right, I'm going to slow my roll just a little bit here
00:37:02.820 --> 00:37:06.980
because I think I kind of have all the time in the world.
00:37:06.980 --> 00:37:11.540
I will be wrapping up within about 15 or 20 minutes
00:37:11.540 --> 00:37:15.620
at the latest just to avoid stressing out
00:37:15.620 --> 00:37:19.100
my fellow organizers, especially Leo and Sasha that
00:37:19.100 --> 00:37:22.260
have the bulk of the heavy lifting this year.
00:37:22.260 --> 00:37:26.820
And amen, and really, thanks all to everybody.
00:37:26.820 --> 00:37:29.540
God, the nicest part of doing my own talk
00:37:29.540 --> 00:37:31.980
is that I get to say that.
00:37:31.980 --> 00:37:35.460
It's just so much fun to contribute to emacsConf.
00:37:35.460 --> 00:37:38.740
And if you're at all interested, there's
00:37:38.740 --> 00:37:43.100
plenty of completely backstage, behind the curtain role.
00:37:43.100 --> 00:37:45.340
Behind the curtain roles doesn't mean
00:37:45.340 --> 00:37:49.020
you have to be somebody that likes talking or being
00:37:49.020 --> 00:37:50.060
on webcam.
00:37:50.060 --> 00:37:52.300
Sorry that my camera isn't working this year.
00:37:52.300 --> 00:37:53.980
I spent quite a while fussing with that
00:37:53.980 --> 00:37:56.740
and lost all my time to get my prereq working.
00:37:56.740 --> 00:38:10.140
All right, so trying to think where I can take us
00:38:10.140 --> 00:38:11.540
without my demo working.
00:38:11.540 --> 00:38:14.540
I was really hoping to show the org Babel piece.
00:38:14.540 --> 00:38:15.580
That's really fun.
00:38:15.580 --> 00:38:20.420
So let me just mention briefly how I'm using this at work.
00:38:20.420 --> 00:38:25.980
So at work, I'll have some type of org document.
00:38:25.980 --> 00:38:27.700
And usually, it's a project.
00:38:27.700 --> 00:38:32.900
So the title of the document is My Project.
00:38:32.900 --> 00:38:37.820
And then I'll have a requirements section.
00:38:37.820 --> 00:38:43.540
And I'll have a meeting notes section.
00:38:43.540 --> 00:38:44.980
That's probably the key thing.
00:38:44.980 --> 00:38:49.540
And then as the project goes on, I'll start having--
00:38:49.540 --> 00:38:50.740
I'm a solutions architect.
00:38:50.740 --> 00:38:55.420
So my job is formalizing design in large part.
00:38:55.420 --> 00:39:01.740
So then I'll have a design documents section.
00:39:01.740 --> 00:39:05.020
And this is where I'll be doing a lot of my work.
00:39:05.020 --> 00:39:07.220
So I'll start out saying--
00:39:07.220 --> 00:39:26.620
[AUDIO OUT]
00:39:26.620 --> 00:39:29.340
And maybe Bob is a subject matter expert
00:39:29.340 --> 00:39:32.460
whose buy-in I need to have on how we're going
00:39:32.460 --> 00:39:34.820
to do the high-level design.
00:39:34.820 --> 00:39:38.470
Maybe a lead engineer or a dev manager or something like
00:39:38.470 --> 00:39:39.460
that.
00:39:39.460 --> 00:39:43.580
All right, as my work goes on, then this
00:39:43.580 --> 00:39:47.620
will start getting into more detail.
00:39:47.620 --> 00:40:16.620
[AUDIO OUT]
00:40:16.620 --> 00:40:18.660
And things of this nature.
00:40:18.660 --> 00:40:20.180
As things get further and further,
00:40:20.180 --> 00:40:21.740
I'll actually have documentation
00:40:21.740 --> 00:40:22.820
that I'm adding in here.
00:40:22.820 --> 00:40:28.900
Oh, I see.
00:40:28.900 --> 00:40:29.740
It's a big mess.
00:40:29.740 --> 00:40:32.140
All right, well, we'll just reuse this.
00:40:32.140 --> 00:40:40.380
So I can insert those all in line.
00:40:40.380 --> 00:40:44.140
And now for the fun part, let's see if the most trivial
00:40:44.140 --> 00:40:44.460
case
00:40:44.460 --> 00:40:45.460
is working here.
00:40:47.460 --> 00:40:47.460
00:40:47.460 --> 00:40:49.940
[CLICK]
00:40:49.940 --> 00:40:51.180
No.
00:40:51.180 --> 00:40:52.900
All right, completely broken.
00:40:52.900 --> 00:40:57.260
Let me drag.
00:40:57.260 --> 00:41:05.180
All right, well, apologies again for the poor quality
00:41:05.180 --> 00:41:06.260
of my demo today.
00:41:06.260 --> 00:41:13.900
And let me just look real quick at my Etherpad once more.
00:41:13.900 --> 00:41:16.820
And I'll glance at BBB to see if there's anybody
00:41:16.820 --> 00:41:18.140
jumping in with questions.
00:41:18.140 --> 00:41:23.740
And then I'll go back to IRC and look for questions there.
00:41:23.740 --> 00:41:33.180
OK, and I don't see any additional questions on the pad.
00:41:33.180 --> 00:41:35.780
I'm just going to scan IRC real quick.
00:41:35.780 --> 00:41:42.460
I suspect that the TreeSitter comment isn't for me.
00:41:42.460 --> 00:41:44.900
[CHUCKLES]
00:41:44.900 --> 00:41:56.620
All right, and I'm not seeing a lot of questions there.
00:41:56.620 --> 00:42:04.340
So I'm just going to vamp for just a minute or two.
00:42:04.340 --> 00:42:07.980
As I mentioned, I'm a conference volunteer.
00:42:07.980 --> 00:42:09.700
This is my third year volunteering
00:42:09.700 --> 00:42:11.940
with the conference.
00:42:11.940 --> 00:42:15.140
And probably if you take one thing away from my talk,
00:42:15.140 --> 00:42:17.740
it should be I really like volunteering
00:42:17.740 --> 00:42:18.500
for the conference.
00:42:18.500 --> 00:42:19.900
It's fun.
00:42:19.900 --> 00:42:23.500
It makes me feel sort of close to the pulse.
00:42:23.500 --> 00:42:26.660
And it gives me a chance to just interact
00:42:26.660 --> 00:42:29.260
with people that have very different perspectives
00:42:29.260 --> 00:42:32.740
on Emacs, which is something that I really value a lot.
00:42:32.740 --> 00:42:40.220
Emacs, like anything else sort of in the internet world,
00:42:40.220 --> 00:42:42.940
has a real echo chamber factor.
00:42:42.940 --> 00:42:47.660
If you do or don't use Package, you probably
00:42:47.660 --> 00:42:49.380
interact with a lot of people that
00:42:49.380 --> 00:42:53.500
feel the same way about that.
00:42:53.500 --> 00:42:57.420
And so I really recommend volunteering for EmacsConf
00:42:57.420 --> 00:43:01.340
as a way to sort of mix it up and get
00:43:01.340 --> 00:43:05.250
to know people that may not use Emacs the same way that you
00:43:05.250 --> 00:43:05.540
do.
00:43:08.380 --> 00:43:10.420
Or perhaps more on topic, though,
00:43:10.420 --> 00:43:14.300
the log line for this talk is it's really quite easy
00:43:14.300 --> 00:43:20.760
to build a program that uses Emacs in a pipeline capability
00:43:20.760 --> 00:43:20.980
.
00:43:20.980 --> 00:43:23.780
I think there's a ton of opportunity in this space.
00:43:23.780 --> 00:43:27.700
This particular example is just a trivial web server
00:43:27.700 --> 00:43:29.540
written
00:43:29.540 --> 00:43:30.780
using Node.js.
00:43:30.780 --> 00:43:39.660
But as was pointed out, we could have used LNode as a web
00:43:39.660 --> 00:43:40.060
server
00:43:40.060 --> 00:43:44.060
and done the entire thing within Emacs Lisp.
00:43:44.060 --> 00:43:49.980
Or really, almost any technology would get us this
00:43:49.980 --> 00:43:52.900
capability.
00:43:52.900 --> 00:43:54.660
From an implementation standpoint,
00:43:54.660 --> 00:43:59.270
I had a lot of fun building this trivial little e-lisp pars
00:43:59.270 --> 00:43:59.580
er.
00:43:59.580 --> 00:44:03.220
And I'm rather pleased with the fact
00:44:03.220 --> 00:44:07.340
that the entirety of that--
00:44:07.340 --> 00:44:14.180
the entire algorithm for turning JavaScript or JSON data,
00:44:14.180 --> 00:44:20.420
we could say, into e-lisp is really a one-liner.
00:44:20.420 --> 00:44:25.820
Albeit a nasty one-liner, that was pretty cool
00:44:25.820 --> 00:44:28.180
to discover how simple that was.
00:44:28.180 --> 00:44:31.220
So in my mind, that opens up a lot of possibility.
00:44:31.220 --> 00:44:32.940
If it's this easy in JavaScript, I
00:44:32.940 --> 00:44:35.700
wouldn't expect it to be hard, any more difficult
00:44:35.700 --> 00:44:36.860
in your favorite language.
00:44:36.860 --> 00:44:41.140
Glance one more time to see if there
00:44:41.140 --> 00:44:42.940
happen to be any other questions.
00:44:42.940 --> 00:44:47.300
And not seeing any, I'm going to go ahead and start
00:44:47.300 --> 00:44:49.500
wrapping up my chat now.
00:44:49.500 --> 00:44:51.620
It will take me a couple of minutes to do that.
00:44:51.620 --> 00:44:54.580
So if you do have any other questions that you
00:44:54.580 --> 00:44:56.460
want to drop into the pad or any comments,
00:44:56.460 --> 00:44:59.740
you're more than welcome to hit me with those
00:44:59.740 --> 00:45:03.820
as I coordinate closing this chat, this talk,
00:45:03.820 --> 00:45:06.100
with the organizer team.
00:45:06.100 --> 00:45:09.580
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