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| -rw-r--r-- | 2022/captions/emacsconf-2022-orgvm--orgvm-a-simple-http-server-for-org--corwin-brust--main.vtt | 2348 |
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diff --git a/2022/captions/emacsconf-2022-orgvm--orgvm-a-simple-http-server-for-org--corwin-brust--main.vtt b/2022/captions/emacsconf-2022-orgvm--orgvm-a-simple-http-server-for-org--corwin-brust--main.vtt new file mode 100644 index 00000000..7f9550b2 --- /dev/null +++ b/2022/captions/emacsconf-2022-orgvm--orgvm-a-simple-http-server-for-org--corwin-brust--main.vtt @@ -0,0 +1,2348 @@ +WEBVTT + +00:00:00.000 --> 00:00:26.000 + [MUSIC PLAYING] + +00:00:26.000 --> 00:00:36.000 + [MUSIC PLAYING] + +00:00:36.000 --> 00:00:42.480 + And so this little application-- + +00:00:42.480 --> 00:00:46.480 + well, I'll skip that and just kind of jump right + +00:00:46.480 --> 00:00:49.760 + into my thesis for those of you that + +00:00:49.760 --> 00:00:53.360 + might be planning to duck out for the RMS talk, + +00:00:53.360 --> 00:00:55.520 + starting in a little bit. + +00:00:55.520 --> 00:00:59.360 + So essentially, my thesis here is really + +00:00:59.360 --> 00:01:04.800 + that the Emacs toolchain can easily + +00:01:04.800 --> 00:01:10.280 + be combined with other skills and used in kind of a Unix + +00:01:10.280 --> 00:01:13.280 + paradigm of having sort of different tools + +00:01:13.280 --> 00:01:14.960 + to do different steps. + +00:01:14.960 --> 00:01:17.760 + We might actually use the same tool + +00:01:17.760 --> 00:01:19.240 + to implement a couple of steps. + +00:01:19.240 --> 00:01:22.080 + But with that paradigm, each step + +00:01:22.080 --> 00:01:24.960 + is an individual item that can be sort of dropped in + +00:01:24.960 --> 00:01:26.400 + and replaced. + +00:01:26.400 --> 00:01:29.560 + So over the course of the talk, hopefully I'll + +00:01:29.560 --> 00:01:31.080 + come back to that thesis. + +00:01:31.080 --> 00:01:35.800 + But I'll now jump back and start walking through what is + +00:01:35.800 --> 00:01:37.040 + orgvm? + +00:01:37.040 --> 00:01:39.560 + So this is a very simple proof of concept program. + +00:01:39.560 --> 00:01:44.200 + We'll just jump over to perhaps a prettier view of the + +00:01:44.200 --> 00:01:44.880 + source + +00:01:44.880 --> 00:01:45.520 + code for it. + +00:01:45.520 --> 00:01:49.200 + This is implemented-- oops. + +00:01:49.200 --> 00:01:53.160 + There's some cruft, I think, in my local. + +00:01:53.160 --> 00:01:56.560 + All right, so there's config block at the top. + +00:01:56.560 --> 00:01:58.120 + And we'll be jumping back and forth + +00:01:58.120 --> 00:02:01.880 + between the code and the documentation. + +00:02:01.880 --> 00:02:04.080 + So the first thing I want to point out + +00:02:04.080 --> 00:02:05.960 + is that this is written in Node.js. + +00:02:05.960 --> 00:02:08.600 + But I think you'll find it'd be pretty trivial to implement + +00:02:08.600 --> 00:02:10.840 + in any language. + +00:02:10.840 --> 00:02:13.960 + Certainly, you're more than welcome to use this. + +00:02:13.960 --> 00:02:17.920 + I'd be happy to accept your patches or feature requests + +00:02:17.920 --> 00:02:20.080 + and things like that. + +00:02:20.080 --> 00:02:21.680 + Of course, bug reports. + +00:02:21.680 --> 00:02:25.760 + But I'd also encourage others to roll their own. + +00:02:25.760 --> 00:02:28.760 + You might well come up with a different version of this + +00:02:28.760 --> 00:02:29.600 + that's even cooler. + +00:02:29.600 --> 00:02:32.160 + And we can learn from each other. + +00:02:32.160 --> 00:02:34.200 + If you heard one of my talks before, + +00:02:34.200 --> 00:02:36.200 + you probably recognize a common theme. + +00:02:36.200 --> 00:02:40.320 + I'm a big fan of head-first development + +00:02:40.320 --> 00:02:43.540 + as a way to get invested in both the tool chain and a + +00:02:43.540 --> 00:02:44.120 + culture. + +00:02:44.120 --> 00:02:49.560 + All right, so let's come back to orgvm. + +00:02:49.560 --> 00:02:52.280 + First of all, we'll start with the itch I was trying to + +00:02:52.280 --> 00:02:52.840 + scratch. + +00:02:52.840 --> 00:02:58.240 + I wanted to be able to quickly use a web browser + +00:02:58.240 --> 00:03:00.680 + to browse my org documents. + +00:03:00.680 --> 00:03:03.530 + It's particularly handy when the documents are full of + +00:03:03.530 --> 00:03:03.960 + cross + +00:03:03.960 --> 00:03:05.640 + links to each other. + +00:03:05.640 --> 00:03:10.080 + That meant I wanted to automatically export, + +00:03:10.080 --> 00:03:12.280 + particularly to HTML. + +00:03:12.280 --> 00:03:17.280 + But it made sense for me to include Markdown, PDF, + +00:03:17.280 --> 00:03:18.880 + or whatever format I want. + +00:03:18.880 --> 00:03:22.760 + Because many times, I'm going to look at that file + +00:03:22.760 --> 00:03:29.480 + and then pop it into an email or upload it somewhere. + +00:03:29.480 --> 00:03:33.240 + And then finally, it should be, therefore, + +00:03:33.240 --> 00:03:36.840 + pretty easy to download the document rather than view it + +00:03:36.840 --> 00:03:38.320 + once I'm done. + +00:03:38.320 --> 00:03:42.200 + So let's just run a quick demo. + +00:03:42.200 --> 00:03:44.760 + You'll see I'm still a Windows user. + +00:03:44.760 --> 00:03:45.960 + Yeah, I'm working on it. + +00:03:45.960 --> 00:03:52.320 + So all right, first thing that we're going to do + +00:03:52.320 --> 00:03:53.320 + is fire up the program. + +00:03:53.320 --> 00:04:00.200 + Actually, for simplicity, let's just + +00:04:00.200 --> 00:04:01.760 + admit we live in a DOS world. + +00:04:01.760 --> 00:04:19.760 + And as you can see, there's not much to it + +00:04:19.760 --> 00:04:21.520 + to get the application running. + +00:04:22.680 --> 00:04:22.680 + + +00:04:22.680 --> 00:04:25.960 + So with that done, then, I can run out to my local host. + +00:04:25.960 --> 00:04:36.780 + And we'll just start by plugging in the name of an org file + +00:04:36.780 --> 00:04:37.560 +. + +00:04:37.560 --> 00:04:45.820 + So I've got a little org file that I prepared that just + +00:04:45.820 --> 00:04:46.640 + kind + +00:04:46.640 --> 00:04:49.040 + of provides a proof of concept to this. + +00:04:49.040 --> 00:04:53.560 + And you can see, as imagined, we're automatically + +00:04:53.560 --> 00:04:54.640 + turning that org file. + +00:04:54.640 --> 00:04:56.320 + Let's just take a quick look at it. + +00:04:56.320 --> 00:05:10.280 + And here's that file now. + +00:05:10.280 --> 00:05:11.960 + But you can see nothing up my sleeve. + +00:05:11.960 --> 00:05:14.000 + This is a very basic org file that I + +00:05:14.000 --> 00:05:16.560 + use for testing this program. + +00:05:16.560 --> 00:05:17.640 + Images work. + +00:05:17.640 --> 00:05:21.800 + We've got some nicely syntax highlighted code + +00:05:21.800 --> 00:05:25.560 + blocks in a couple different languages. + +00:05:25.560 --> 00:05:29.760 + And not really that much going on there. + +00:05:29.760 --> 00:05:33.760 + All right, let's come back to the documentation. + +00:05:33.760 --> 00:05:36.680 + I pretty well covered this, I think. + +00:05:36.680 --> 00:05:39.720 + But you'll need a relatively recent version of Emacs. + +00:05:39.720 --> 00:05:43.640 + I haven't taken any pains to make this backward compatible. + +00:05:43.640 --> 00:05:46.000 + To be fair, I haven't tested it extensively. + +00:05:46.000 --> 00:05:50.320 + It may well work on Emacs 26 or older versions. + +00:05:50.320 --> 00:05:55.120 + I'm personally running 27.1 and 28, + +00:05:55.120 --> 00:05:57.080 + as well as recent builds of 29. + +00:05:57.080 --> 00:06:02.560 + There's some quick start instructions here, + +00:06:02.560 --> 00:06:03.900 + which I'm going to take as read. + +00:06:03.900 --> 00:06:09.160 + You probably saw the key element of this, which + +00:06:09.160 --> 00:06:11.920 + involves starting the program. + +00:06:11.920 --> 00:06:13.520 + You do-- I will call out Yale. + +00:06:13.520 --> 00:06:15.320 + If you're trying to play with this yourself, + +00:06:15.320 --> 00:06:20.080 + don't forget to run the npm install command. + +00:06:20.080 --> 00:06:23.240 + That'll bring in express.js, which the JavaScript we're + +00:06:23.240 --> 00:06:24.920 + about to look at is built on. + +00:06:24.920 --> 00:06:33.480 + So let's just take a look at the usage patterns real quick. + +00:06:33.480 --> 00:06:35.920 + To use this, we're simply giving the document name + +00:06:35.920 --> 00:06:42.760 + without the org extension in whatever file path-- + +00:06:42.760 --> 00:06:46.960 + or I'm sorry, whatever we've configured the server + +00:06:46.960 --> 00:06:50.800 + to run on, in this case, port 3000. + +00:06:50.800 --> 00:06:52.960 + I also want to call attention to the fact + +00:06:52.960 --> 00:06:55.880 + that nothing in this program protects you + +00:06:55.880 --> 00:06:57.240 + from damaging yourself. + +00:06:57.240 --> 00:07:00.560 + This isn't meant as a production capability. + +00:07:00.560 --> 00:07:03.290 + This is something that's used to publish your own note + +00:07:03.290 --> 00:07:04.840 + files + +00:07:04.840 --> 00:07:06.520 + and roll them up to yourself. + +00:07:06.520 --> 00:07:08.680 + That's something I'll definitely look at adding, + +00:07:08.680 --> 00:07:12.240 + but I want people to be careful of it + +00:07:12.240 --> 00:07:14.720 + while this is in an alpha state. + +00:07:14.720 --> 00:07:22.960 + So the default response is HTML, and we saw that here. + +00:07:22.960 --> 00:07:26.240 + But we also can modify the response format. + +00:07:26.240 --> 00:07:29.800 + We're currently supporting HTML, Markdown, and PDF. + +00:07:29.800 --> 00:07:34.280 + And that's really enough to select a different format. + +00:07:34.280 --> 00:07:36.640 + That's really nothing more than adding-- + +00:07:36.640 --> 00:07:45.040 + [AUDIO OUT] + +00:07:45.040 --> 00:07:48.040 + --type, OK. + +00:07:48.040 --> 00:07:50.680 + Not sure what's going on there. + +00:07:50.680 --> 00:07:57.080 + OK, well, there goes my demo. + +00:07:57.080 --> 00:07:59.440 + Shows me for doing my talk live. + +00:08:03.920 --> 00:08:06.960 + But this, fortunately, this error message + +00:08:06.960 --> 00:08:08.840 + is a nice segue to the part of the talk + +00:08:08.840 --> 00:08:10.240 + that I'd really like to focus on, + +00:08:10.240 --> 00:08:13.520 + hopefully bringing me back to that thesis. + +00:08:13.520 --> 00:08:17.760 + So as we start to look at code, what we're looking for + +00:08:17.760 --> 00:08:21.640 + is really this Emacs Lisp that's getting generated here. + +00:08:21.640 --> 00:08:24.000 + And you'll notice that's the stuff + +00:08:24.000 --> 00:08:27.600 + I thought was important to produce as diagnostics + +00:08:27.600 --> 00:08:29.840 + for the programs running as well. + +00:08:29.840 --> 00:08:34.000 + So spoiler, this e-lisp is dynamically + +00:08:34.000 --> 00:08:35.400 + generated by the program. + +00:08:35.400 --> 00:08:38.160 + And that's really the core of the way + +00:08:38.160 --> 00:08:42.680 + org VM or my org VM works. + +00:08:42.680 --> 00:08:47.360 + So this should look pretty similar to the view of the code + +00:08:47.360 --> 00:08:48.880 + we had a moment ago. + +00:08:48.880 --> 00:08:51.840 + You can see I've got some bases. + +00:08:51.840 --> 00:08:53.680 + This is all hard-coded into the program, + +00:08:53.680 --> 00:08:56.720 + nothing fancy going on here. + +00:08:56.720 --> 00:09:00.280 + The debug is simply controlling that diagnostic output + +00:09:00.280 --> 00:09:01.560 + that we looked at. + +00:09:01.560 --> 00:09:04.240 + There's some other, hopefully fairly self-explanatory + +00:09:04.240 --> 00:09:09.160 + programs or properties, where to find Emacs and so forth. + +00:09:09.160 --> 00:09:16.320 + And then finally, we come in to the meat of it, + +00:09:16.320 --> 00:09:21.840 + the variables that are used to control what e-lisp we + +00:09:21.840 --> 00:09:24.280 + can generate dynamically. + +00:09:24.280 --> 00:09:27.400 + So here, we're controlling the extension + +00:09:27.400 --> 00:09:29.360 + that it should look for org files. + +00:09:29.360 --> 00:09:31.560 + Hopefully not too many people out there + +00:09:31.560 --> 00:09:34.080 + with a weird extension for the org files, + +00:09:34.080 --> 00:09:37.920 + but this should support that. + +00:09:37.920 --> 00:09:40.120 + I'm afraid that is something I've been known to do. + +00:09:40.120 --> 00:09:49.520 + Then we define a list of additional export types. + +00:09:49.520 --> 00:09:50.760 + Here's one that ought to work. + +00:09:50.760 --> 00:09:53.200 + Let's take a look at type equals org. + +00:09:54.720 --> 00:09:54.720 + + +00:09:54.720 --> 00:09:59.320 + And, aha, it's giving us the file. + +00:09:59.320 --> 00:10:00.680 + So I'm not going to open that up, + +00:10:00.680 --> 00:10:02.400 + but now we can see that that's definitely + +00:10:02.400 --> 00:10:09.200 + working for certain versions of working. + +00:10:09.200 --> 00:10:14.280 + So this list of type parameters is + +00:10:14.280 --> 00:10:15.720 + controlling the supported types. + +00:10:15.720 --> 00:10:18.550 + Hopefully it should be fairly easy to add in different ones + +00:10:18.550 --> 00:10:18.800 +. + +00:10:18.800 --> 00:10:21.480 + The fancy footwork here is just a list + +00:10:21.480 --> 00:10:23.480 + of the types that we're going to be using. + +00:10:23.480 --> 00:10:29.320 + The fancy footwork here involves, first of all, + +00:10:29.320 --> 00:10:32.240 + there's the extension and the MIME type. + +00:10:32.240 --> 00:10:36.520 + That's, as you might guess, used to control the response + +00:10:36.520 --> 00:10:37.040 + content + +00:10:37.040 --> 00:10:38.720 + type. + +00:10:38.720 --> 00:10:40.920 + We also have this replace variable. + +00:10:40.920 --> 00:10:44.000 + This prevents-- there's an optimization + +00:10:44.000 --> 00:10:48.840 + to send an existing PDF or HTML file if that's already + +00:10:48.840 --> 00:10:53.520 + there, but only if the original source org file hasn't + +00:10:53.520 --> 00:10:56.240 + been modified since. + +00:10:56.240 --> 00:10:59.920 + This replace effectively can turn that off. + +00:10:59.920 --> 00:11:03.040 + If I remove the replace equals true attribute, + +00:11:03.040 --> 00:11:07.600 + then I'll be prevented from overwriting that. + +00:11:07.600 --> 00:11:10.320 + In other words, I'll always send a cached version. + +00:11:10.320 --> 00:11:13.880 + That might be helpful if, for example, you've + +00:11:13.880 --> 00:11:16.560 + got hand-tuned PDFs and you don't want to accidentally + +00:11:16.560 --> 00:11:17.200 + overwrite them. + +00:11:19.120 --> 00:11:19.120 + + +00:11:19.120 --> 00:11:23.480 + All right, let's get into the code a little bit more. + +00:11:23.480 --> 00:11:28.280 + I'm going to skip past the really good stuff + +00:11:28.280 --> 00:11:32.520 + and jump into the boring parts so that we have them + +00:11:32.520 --> 00:11:34.240 + as context. + +00:11:34.240 --> 00:11:37.160 + Here's the default path. + +00:11:37.160 --> 00:11:41.880 + And it is going to send me the readme from the project-- + +00:11:41.880 --> 00:11:47.120 + from the project repo if I don't specify a path. + +00:11:47.120 --> 00:11:51.240 + And then we have a couple of different endpoints + +00:11:51.240 --> 00:11:52.480 + that we support. + +00:11:52.480 --> 00:11:55.560 + We'll come back to this first one. + +00:11:55.560 --> 00:11:59.600 + For now, let's start with the more normal one, which + +00:11:59.600 --> 00:12:01.760 + is just giving us a file name. + +00:12:01.760 --> 00:12:04.160 + So we can see we start by figuring out + +00:12:04.160 --> 00:12:08.520 + what the physical file name should be called. + +00:12:08.520 --> 00:12:10.280 + And assuming that that exists-- + +00:12:15.600 --> 00:12:17.080 + sorry, I've confused myself. + +00:12:17.080 --> 00:12:23.000 + So this is the caching or the optimization + +00:12:23.000 --> 00:12:25.640 + that I mentioned, sending the existing file. + +00:12:25.640 --> 00:12:31.360 + This file exists is where the optimization is + +00:12:31.360 --> 00:12:38.680 + that regenerates the file if the source + +00:12:38.680 --> 00:12:41.840 + or document for the HTML generator has changed. + +00:12:45.080 --> 00:12:46.760 + Again, this is a short talk, so I'm not + +00:12:46.760 --> 00:12:49.320 + going to go into all the nuances of this JavaScript code. + +00:12:49.320 --> 00:12:52.800 + It's pretty far from an Emacs-related thing. + +00:12:52.800 --> 00:12:56.040 + So with that said, then, the rest of this program + +00:12:56.040 --> 00:12:59.360 + is really mostly just handling the different error. + +00:12:59.360 --> 00:13:01.000 + I didn't understand that type. + +00:13:01.000 --> 00:13:02.080 + I don't know the document. + +00:13:02.080 --> 00:13:03.040 + I failed. + +00:13:03.040 --> 00:13:06.480 + Otherwise, there's the caching. + +00:13:06.480 --> 00:13:14.520 + And here's really where things get interesting, + +00:13:14.520 --> 00:13:19.200 + where we've generated some ELISP, + +00:13:19.200 --> 00:13:22.280 + and then we're calling Emacs with that ELISP. + +00:13:22.280 --> 00:13:24.760 + If everything works, we'll send the file. + +00:13:24.760 --> 00:13:27.800 + If it doesn't, we'll send the 500. + +00:13:27.800 --> 00:13:30.920 + And we've already seen the 500, so we know that works. + +00:13:30.920 --> 00:13:33.760 + All right, let's get to the interesting part. + +00:13:33.760 --> 00:13:37.320 + Sorry, one more footnote. + +00:13:37.320 --> 00:13:39.320 + There is a capability built in that will + +00:13:39.320 --> 00:13:41.040 + allow us to execute an org block. + +00:13:41.040 --> 00:13:42.840 + Let's see if that's working in our local. + +00:13:44.800 --> 00:13:44.800 + + +00:13:44.800 --> 00:13:47.200 + I'll remind myself how to do it. + +00:13:47.200 --> 00:13:49.560 + It's run. + +00:13:49.560 --> 00:13:53.320 + I think it's called test. + +00:13:53.320 --> 00:13:56.360 + And that's returning a 500. + +00:13:56.360 --> 00:13:58.400 + I'm suspecting that's running because I'm running + +00:13:58.400 --> 00:13:59.760 + in command instead of bash. + +00:13:59.760 --> 00:14:06.040 + Oh, yeah, so the failure is happening + +00:14:06.040 --> 00:14:07.720 + after I generate the ELISP. + +00:14:07.720 --> 00:14:10.280 + I'm pretty confident that is what the actual problem is. + +00:14:10.280 --> 00:14:12.760 + If we have time, I'll jump back over there + +00:14:12.760 --> 00:14:19.280 + and relaunch it in mingity-bash. + +00:14:19.280 --> 00:14:21.440 + And we can see it actually work. + +00:14:21.440 --> 00:14:24.200 + But this works pretty well for me on my work laptop. + +00:14:24.200 --> 00:14:25.860 + I didn't have to make any changes to it. + +00:14:25.860 --> 00:14:28.120 + So I have a fairly high amount of confidence, + +00:14:28.120 --> 00:14:32.400 + at least in trivial cases, this works pretty well. + +00:14:32.400 --> 00:14:37.800 + All right, so what I actually wanted to talk about today-- + +00:14:37.800 --> 00:14:42.400 + and I'm going to be kind of hand-waving around this ES5 + +00:14:42.400 --> 00:14:46.480 + class that I've got and kind of the way that works. + +00:14:46.480 --> 00:14:49.840 + Hopefully, this will be pretty familiar to you + +00:14:49.840 --> 00:14:53.440 + if you are a JavaScript programmer. + +00:14:53.440 --> 00:14:58.660 + The interesting stuff comes when we want to build some LISP + +00:14:58.660 --> 00:14:59.000 +. + +00:15:01.960 --> 00:15:09.410 + Here, you can see that I really don't have a whole lot of + +00:15:09.410 --> 00:15:09.720 + code + +00:15:09.720 --> 00:15:11.280 + around formatting LISP. + +00:15:11.280 --> 00:15:14.360 + You can see that I've special-cased + +00:15:14.360 --> 00:15:19.840 + whether the arguments that were passed + +00:15:19.840 --> 00:15:20.880 + happen to be a function. + +00:15:20.880 --> 00:15:25.480 + If they are, I'm going to call that function. + +00:15:25.480 --> 00:15:31.720 + And then the result will be formatted as LISP. + +00:15:31.720 --> 00:15:35.040 + So this would be a recursive call here. + +00:15:35.040 --> 00:15:40.960 + Otherwise, I'm just going to return the arguments. + +00:15:40.960 --> 00:15:48.440 + Sorry, otherwise, I will slap a pair of parentheses + +00:15:48.440 --> 00:15:53.440 + around the result of walking that list + +00:15:53.440 --> 00:15:57.880 + if I get formatting each element of the list of arguments + +00:15:57.880 --> 00:16:02.600 + that this format LISP process calls + +00:16:02.600 --> 00:16:04.920 + and separating them with spaces. + +00:16:04.920 --> 00:16:10.880 + So in short form, this program walks through a list. + +00:16:10.880 --> 00:16:14.000 + If the list it receives is a function, + +00:16:14.000 --> 00:16:16.080 + it calls that function. + +00:16:16.080 --> 00:16:19.320 + Once that's handled or otherwise, + +00:16:19.320 --> 00:16:22.720 + we simply walk the list, taking the arguments, + +00:16:22.720 --> 00:16:26.000 + concatenating them on strings, and finally, + +00:16:26.000 --> 00:16:28.560 + wrap the results in parentheses. + +00:16:28.560 --> 00:16:31.760 + So what I didn't mention there but might be obvious + +00:16:31.760 --> 00:16:36.120 + is if I have a nested list, the inner list + +00:16:36.120 --> 00:16:38.600 + will be subjected to the same treatment. + +00:16:38.600 --> 00:16:43.000 + So this is a recursive sort of algorithm. + +00:16:43.000 --> 00:16:51.520 + All right, so now when I go to export, + +00:16:51.520 --> 00:16:53.520 + actually, in the interest of time, + +00:16:53.520 --> 00:16:55.800 + I'm going to avoid walking through that piece of code + +00:16:55.800 --> 00:16:58.840 + and let's focus instead on the more interesting part + +00:16:58.840 --> 00:17:02.360 + of how that LISP gets encoded. + +00:17:02.360 --> 00:17:07.520 + So coming back to the PDF is a good example here + +00:17:07.520 --> 00:17:10.320 + 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 + [AUDIO OUT] + +00:45:09.580 --> 00:45:12.580 + [AUDIO OUT] + +00:45:14.580 --> 00:45:14.580 + + +00:45:14.580 --> 00:45:17.580 + [AUDIO OUT] + +00:45:17.580 --> 00:45:20.580 + [AUDIO OUT] + +00:45:22.580 --> 00:45:22.580 + + +00:45:22.580 --> 00:45:25.580 + [AUDIO OUT] + +00:45:25.580 --> 00:45:33.580 + [AUDIO OUT] + +00:45:33.580 --> 00:45:44.580 + [AUDIO OUT] + +00:45:44.580 --> 00:45:47.620 + [AUDIO OUT] + +00:45:47.620 --> 00:45:50.620 + [AUDIO OUT] + +00:45:50.620 --> 00:45:53.620 + [AUDIO OUT] + +00:45:53.620 --> 00:45:56.620 + [AUDIO OUT] + +00:45:56.620 --> 00:45:59.620 + [AUDIO OUT] + +00:46:01.620 --> 00:46:01.620 + + +00:46:01.620 --> 00:46:04.620 + [AUDIO OUT] + |