WEBVTT Kind: captions: Language: en-GB 00:00:01.000 --> 00:00:03.000 Hi! My name is Eduardo Ochs 00:00:03.000 --> 00:00:06.000 and this video is about two things... 00:00:06.000 --> 00:00:09.000 first, it's about a way to configure 00:00:09.000 --> 00:00:14.000 eev - my Emacs package - on M$ Windows, 00:00:14.000 --> 00:00:16.000 and second, it's about magic, in a sense 00:00:16.000 --> 00:00:18.000 that I'm going to explain soon. 00:00:18.000 --> 00:00:21.000 There's a lot of information about eev 00:00:21.000 --> 00:00:24.000 in this link here, and a lot of 00:00:24.000 --> 00:00:26.000 information about this video in this 00:00:26.000 --> 00:00:29.000 other link. 00:00:29.000 --> 00:00:31.000 Let me start by explaining what I 00:00:31.000 --> 00:00:34.000 mean by configuring eev. 00:00:34.000 --> 00:00:37.000 Installing Emacs and eev is very easy 00:00:37.000 --> 00:00:38.000 even on Windows, 00:00:38.000 --> 00:00:41.000 but for more advanced usage eev needs 00:00:41.000 --> 00:00:44.000 to play videos, to display PDFs, and to 00:00:44.000 --> 00:00:46.000 download files... and so 00:00:46.000 --> 00:00:48.000 to make it all these things work we need 00:00:48.000 --> 00:00:50.000 to: download some things, configure some 00:00:50.000 --> 00:00:54.000 paths, and put some commands in the 00:00:54.000 --> 00:00:57.000 init file of Emacs, that is this one here: 00:00:57.000 --> 00:01:01.000 ~/.emacs. 00:01:01.000 --> 00:01:03.000 Let me explain what is my target 00:01:03.000 --> 00:01:05.000 audience in this video 00:01:05.000 --> 00:01:09.000 It is mainly for beginners - I mean, for 00:01:09.000 --> 00:01:12.000 people who use Windows but they are 00:01:12.000 --> 00:01:16.000 not even programmers 00:01:16.000 --> 00:01:18.000 they know how to use a few programs but 00:01:18.000 --> 00:01:20.000 they don't even know how to 00:01:20.000 --> 00:01:22.000 use a terminal... they know how to open a 00:01:22.000 --> 00:01:24.000 terminal, but they don't know how to 00:01:24.000 --> 00:01:26.000 use it 00:01:26.000 --> 00:01:29.000 fluently or in a productive way. 00:01:29.000 --> 00:01:32.000 And my second target audience is people 00:01:32.000 --> 00:01:35.000 who have been using Emacs for 00:01:35.000 --> 00:01:37.000 years and who are interested in 00:01:37.000 --> 00:01:40.000 alternatives to the standard way of 00:01:40.000 --> 00:01:42.000 configuring things in Emacs, which is 00:01:42.000 --> 00:01:49.000 M-x customize. 00:01:49.000 --> 00:01:51.000 Let me now explain what is eev. 00:01:51.000 --> 00:02:00.000 One second... 00:02:00.000 --> 00:02:05.000 This expression here opens the 00:02:05.000 --> 00:02:07.000 slides of my presentation in the 00:02:07.000 --> 00:02:09.000 EmacsConf 2019. 00:02:09.000 --> 00:02:12.000 Let me show you some things there... 00:02:12.000 --> 00:02:14.000 the title of my presentation was: How to 00:02:14.000 --> 00:02:17.000 record executable notes with eev 00:02:17.000 --> 00:02:19.000 and how to play them back, 00:02:19.000 --> 00:02:21.000 and I started the presentation by 00:02:21.000 --> 00:02:24.000 explaining that I 00:02:24.000 --> 00:02:29.000 started using GNU/Linux and Emacs in 1995 00:02:29.000 --> 00:02:32.000 and I started using Emacs in a certain way 00:02:32.000 --> 00:02:35.000 and I was sure that everybody was 00:02:35.000 --> 00:02:37.000 using Emacs in that way, and that way 00:02:37.000 --> 00:02:40.000 became eev... so, in a sense eev appeared 00:02:40.000 --> 00:02:46.000 by accident. 00:02:46.000 --> 00:02:49.000 My current favorite slogan for explaining 00:02:49.000 --> 00:02:51.000 what is eev is: eev lets you record 00:02:51.000 --> 00:02:53.000 executable notes and lets you play them 00:02:53.000 --> 00:02:55.000 back - 00:02:55.000 --> 00:02:57.000 but for many people this doesn't make 00:02:57.000 --> 00:03:00.000 much sense... let me just enlarge this 00:03:00.000 --> 00:03:08.000 emoji - one second - 00:03:08.000 --> 00:03:10.000 These people they can understand what 00:03:10.000 --> 00:03:11.000 they [this slogan] means 00:03:11.000 --> 00:03:14.000 when I show a demo... for example here is a 00:03:14.000 --> 00:03:19.000 demo of 00:03:19.000 --> 00:03:22.000 me sending commands to an interpreter... 00:03:22.000 --> 00:03:25.000 to Maxima, which is a program - 00:03:25.000 --> 00:03:28.000 sorry - in this demo I 00:03:28.000 --> 00:03:31.000 sent some commands to a program 00:03:31.000 --> 00:03:33.000 called Maxima, that is a program for 00:03:33.000 --> 00:03:36.000 doing symbolic computations, graphics, and 00:03:36.000 --> 00:03:37.000 other things, 00:03:37.000 --> 00:03:40.000 and Maxima calls GNUPlot to draw some 00:03:40.000 --> 00:03:47.000 graphics and... 00:03:47.000 --> 00:03:51.000 so: here are my notes, I mean, the commands 00:03:51.000 --> 00:03:53.000 that I send to Maxima... and I just had to 00:03:53.000 --> 00:03:56.000 type f8 to make Emacs send this commands 00:03:56.000 --> 00:04:00.000 to Maxima. 00:04:00.000 --> 00:04:03.000 So: many people can understand how 00:04:03.000 --> 00:04:05.000 I do these things, but very few people 00:04:05.000 --> 00:04:08.000 use eev fluently enough to record 00:04:08.000 --> 00:04:11.000 executable notes of what they do. 00:04:11.000 --> 00:04:13.000 My older slogan 00:04:13.000 --> 00:04:16.000 was even more puzzling... 00:04:16.000 --> 00:04:19.000 I used to say that "eev is a tool for 00:04:19.000 --> 00:04:22.000 automating almost everything", and also 00:04:22.000 --> 00:04:24.000 very few people 00:04:24.000 --> 00:04:29.000 are using eev for automating their tasks - 00:04:29.000 --> 00:04:35.000 which is very sad. 00:04:35.000 --> 00:04:37.000 Let me explain the connection with 00:04:37.000 --> 00:04:42.000 Org Mode - one second - 00:04:42.000 --> 00:04:45.000 Org mode can also be used to record 00:04:45.000 --> 00:04:48.000 executable notes and to automate almost 00:04:48.000 --> 00:04:50.000 everything, 00:04:50.000 --> 00:04:52.000 the problem is that org mode is 00:04:52.000 --> 00:04:55.000 intuitive to many people and... 00:04:55.000 --> 00:04:58.000 to MANY people, let me stress this - 00:04:58.000 --> 00:05:02.000 and eev is intuitive to very, very, 00:05:02.000 --> 00:05:05.000 very few people, and Org Mode 00:05:05.000 --> 00:05:09.000 is "simple" in one certain way... it's 00:05:09.000 --> 00:05:12.000 a way that is related to what people 00:05:12.000 --> 00:05:15.000 called "user-friendliness" nowadays - 00:05:15.000 --> 00:05:17.000 and eev is simple in another, totally 00:05:17.000 --> 00:05:20.000 different, way, related to Lisp... 00:05:20.000 --> 00:05:22.000 people sometimes say that Lisp is very 00:05:22.000 --> 00:05:24.000 simple, and eev is simple in a way that is 00:05:24.000 --> 00:05:28.000 similar to how Lisp is simple... 00:05:28.000 --> 00:05:30.000 and, by the way, I find Org Mode very 00:05:30.000 --> 00:05:32.000 hard... for me eev is simple 00:05:32.000 --> 00:05:37.000 in a practical sense, and... 00:05:37.000 --> 00:05:39.000 well, I'm going to explain my problems 00:05:39.000 --> 00:05:44.000 with Org later, with examples. 00:05:44.000 --> 00:05:48.000 So: I decided to 00:05:48.000 --> 00:05:51.000 use a trick to make eev more popular 00:05:51.000 --> 00:05:53.000 and the trick is that people can use 00:05:53.000 --> 00:05:56.000 eev to learn both Emacs and Org Mode - 00:05:56.000 --> 00:05:58.000 so in this video eev is going to be 00:05:58.000 --> 00:06:01.000 something secondary, that people 00:06:01.000 --> 00:06:08.000 can use to learn both Emacs and Org Mode, 00:06:08.000 --> 00:06:11.000 and I'm going to show how we can 00:06:11.000 --> 00:06:15.000 use a certain series of videos 00:06:15.000 --> 00:06:17.000 about Org Mode, and how to index 00:06:17.000 --> 00:06:23.000 those videos to learn Org Mode. 00:06:23.000 --> 00:06:25.000 That's it - I'm recording this video in 00:06:25.000 --> 00:06:27.000 several parts, 00:06:27.000 --> 00:06:30.000 so this is the end of the first part. I'm 00:06:30.000 --> 00:06:32.000 going to record all the parts and then 00:06:32.000 --> 00:06:35.000 glue everything together. 00:06:35.000 --> 00:06:37.000 Let me now explain the basic 00:06:37.000 --> 00:06:39.000 installation in more details. I'm 00:06:39.000 --> 00:06:42.000 not going to show how to install Emacs, 00:06:42.000 --> 00:06:45.000 but once you have Emacs installed you just 00:06:45.000 --> 00:06:47.000 have to follow these steps here, 00:06:47.000 --> 00:06:49.000 and these steps are explained in many 00:06:49.000 --> 00:06:54.000 places... for example, this is the link to 00:06:54.000 --> 00:06:57.000 the material about eev in my home page... 00:06:57.000 --> 00:07:00.000 If you access my home page without this 00:07:00.000 --> 00:07:04.000 #eev you get this thing here, and if you 00:07:04.000 --> 00:07:07.000 access it with the #eev 00:07:07.000 --> 00:07:10.000 you go to this section... 00:07:10.000 --> 00:07:11.000 and note that 00:07:11.000 --> 00:07:14.000 here it says: "This video 00:07:14.000 --> 00:07:18.000 about installation, navigation, etc..." 00:07:18.000 --> 00:07:22.000 let me open this page in another tab - 00:07:22.000 --> 00:07:25.000 and here we have a list of tutorials, 00:07:25.000 --> 00:07:28.000 and let me open the first tutorial in 00:07:28.000 --> 00:07:33.000 another tab. 00:07:33.000 --> 00:07:35.000 Well, 00:07:35.000 --> 00:07:37.000 in Emacs we can access this tutorial by 00:07:37.000 --> 00:07:42.000 running this, so this is the tutorial 00:07:42.000 --> 00:07:44.000 inside Emacs... 00:07:44.000 --> 00:07:47.000 and this is the tutorial in the browser. 00:07:47.000 --> 00:07:50.000 Here we have some links, 00:07:50.000 --> 00:07:52.000 some instructions, and these things here 00:07:52.000 --> 00:07:55.000 are links to that video 00:07:55.000 --> 00:07:59.000 the "installation and navigation", 00:07:59.000 --> 00:08:04.000 "eevnav" - and these links here 00:08:04.000 --> 00:08:06.000 point to positions in the video, but if I 00:08:06.000 --> 00:08:10.000 access them by clicking on these links 00:08:10.000 --> 00:08:12.000 it takes ages to open this video because 00:08:12.000 --> 00:08:16.000 it has to open youtube... 00:08:16.000 --> 00:08:22.000 then it shows an ad, that I have to skip, 00:08:22.000 --> 00:08:24.000 then sometimes another ad, and then it 00:08:24.000 --> 00:08:32.000 plays the video... 00:08:32.000 --> 00:08:35.000 but if we have everything configured 00:08:35.000 --> 00:08:37.000 we can execute these things here - 00:08:37.000 --> 00:08:41.000 these elisp hyperlinks here - 00:08:41.000 --> 00:08:44.000 and they play the video in mpv 00:08:44.000 --> 00:08:47.000 in one second or two. So 00:08:47.000 --> 00:08:51.000 that's it - 00:08:51.000 --> 00:08:53.000 and we can also access the 00:08:53.000 --> 00:08:55.000 list of videos by typing 00:08:55.000 --> 00:09:04.000 M-x find-1stclassvideos... 00:09:04.000 --> 00:09:06.000 we get this listing here, and the video 00:09:06.000 --> 00:09:08.000 about installation and navigation 00:09:08.000 --> 00:09:12.000 is this one. 00:09:12.000 --> 00:09:16.000 And one very nice thing is that - 00:09:16.000 --> 00:09:19.000 sorry - 00:09:19.000 --> 00:09:22.000 when we access this video, here... 00:09:22.000 --> 00:09:24.000 we have a lot of information about the 00:09:24.000 --> 00:09:26.000 video... 00:09:26.000 --> 00:09:29.000 and here we have a link to a kind of 00:09:29.000 --> 00:09:30.000 index to the video... 00:09:30.000 --> 00:09:33.000 so if I execute this 00:09:33.000 --> 00:09:38.000 I go to an index, that is made 00:09:38.000 --> 00:09:41.000 of a series of sexps like this 00:09:41.000 --> 00:09:45.000 this, and I can execute 00:09:45.000 --> 00:09:48.000 one of these sexps by just 00:09:48.000 --> 00:09:53.000 typing M-e on it 00:09:53.000 --> 00:09:55.000 but of course this is only going to work 00:09:55.000 --> 00:09:59.000 if we have the video player configured. 00:09:59.000 --> 00:10:06.000 Let me close everything... 00:10:06.000 --> 00:10:09.000 And configuring the video player is part 00:10:09.000 --> 00:10:12.000 of the "non-basic installation", or the 00:10:12.000 --> 00:10:15.000 "configuration" of eev. 00:10:15.000 --> 00:10:17.000 In principle what we have to do is to 00:10:17.000 --> 00:10:21.000 install mpv - a certain video player - 00:10:21.000 --> 00:10:24.000 then we have to configure the paths 00:10:24.000 --> 00:10:27.000 to the browser, that by default 00:10:27.000 --> 00:10:29.000 is google chrome, and to mpv, 00:10:29.000 --> 00:10:31.000 and then we have to download 00:10:31.000 --> 00:10:34.000 all these things here, that people 00:10:34.000 --> 00:10:37.000 who use windows have never heard about... 00:10:37.000 --> 00:10:39.000 And then we have to configure a few 00:10:39.000 --> 00:10:41.000 other things, some easier to understand 00:10:41.000 --> 00:10:45.000 and some very mysterious... 00:10:45.000 --> 00:10:49.000 Anyway, let me show why we need wget, 00:10:49.000 --> 00:10:51.000 that is a program that downloads things 00:10:51.000 --> 00:10:55.000 from the internet. 00:10:55.000 --> 00:10:58.000 Note that if I just execute this 00:10:58.000 --> 00:11:02.000 I play a video with mpv - 00:11:02.000 --> 00:11:04.000 but I'm going to run a hack here that 00:11:04.000 --> 00:11:06.000 hides all the videos 00:11:06.000 --> 00:11:10.000 that I have downloaded, 00:11:10.000 --> 00:11:13.000 and now if I try to play this video 00:11:13.000 --> 00:11:16.000 eev is going to say that... 00:11:16.000 --> 00:11:18.000 it's going to show me 00:11:18.000 --> 00:11:20.000 all these things here... 00:11:20.000 --> 00:11:24.000 If I don't understand them I can 00:11:24.000 --> 00:11:27.000 follow these things here 00:11:27.000 --> 00:11:29.000 to go to the tutorials 00:11:29.000 --> 00:11:32.000 to understand what this other stuff 00:11:32.000 --> 00:11:35.000 means... 00:11:35.000 --> 00:11:39.000 So, this part here downloads 00:11:39.000 --> 00:11:42.000 some local copies of files from 00:11:42.000 --> 00:11:43.000 the internet... 00:11:43.000 --> 00:11:46.000 this is explained in this tutorial... 00:11:46.000 --> 00:11:49.000 note that this link goes to the 00:11:49.000 --> 00:11:51.000 section 1 of the tutorial, that is 00:11:51.000 --> 00:11:53.000 called "Local copies of files from the 00:11:53.000 --> 00:11:55.000 internet"... 00:11:55.000 --> 00:11:57.000 and this is also explained 00:11:57.000 --> 00:11:59.000 in another tutorial in a way 00:11:59.000 --> 00:12:02.000 that is more specific to videos, 00:12:02.000 --> 00:12:05.000 and we also have this section 00:12:05.000 --> 00:12:07.000 here that explains 00:12:07.000 --> 00:12:11.000 that some videos have subtitles - 00:12:11.000 --> 00:12:12.000 here - 00:12:12.000 --> 00:12:15.000 and explains the functions of eev 00:12:15.000 --> 00:12:20.000 that downloads videos with subtitles. 00:12:20.000 --> 00:12:22.000 This video in particular, which is a 00:12:22.000 --> 00:12:25.000 video for my presentation at the 00:12:25.000 --> 00:12:28.000 EmacsConf 2021, it has subtitles. 00:12:28.000 --> 00:12:31.000 if I execute these things with - oops, 00:12:31.000 --> 00:12:34.000 let me switch to smaller font - if I 00:12:34.000 --> 00:12:39.000 execute these things with f8, then 00:12:39.000 --> 00:12:43.000 the f8s create a shell buffer here... 00:12:43.000 --> 00:12:44.000 a shell running inside Emacs, 00:12:44.000 --> 00:12:48.000 inside an Emacs window... 00:12:48.000 --> 00:12:50.000 and if I type f8 in these lines here 00:12:50.000 --> 00:12:52.000 they are sent to the shell... 00:12:52.000 --> 00:12:56.000 the shell executes these things here, 00:12:56.000 --> 00:13:00.000 and this wget here downloads 00:13:00.000 --> 00:13:02.000 a copy of this file from the internet 00:13:02.000 --> 00:13:04.000 and puts it in this directory... 00:13:04.000 --> 00:13:06.000 and this other wget downloads the 00:13:06.000 --> 00:13:09.000 subtitles for the video... 00:13:09.000 --> 00:13:09.000 so: the .mp4 is the video itself, 00:13:09.000 --> 00:13:12.000 the .vtt is the subtitles of the video, 00:13:12.000 --> 00:13:14.000 and these things here just register 00:13:14.000 --> 00:13:18.000 in a certain log file 00:13:18.000 --> 00:13:20.000 what we have downloaded. 00:13:20.000 --> 00:13:22.000 And now that we have a local copy 00:13:22.000 --> 00:13:26.000 of the video, this sexp here 00:13:26.000 --> 00:13:30.000 opens this directory and goes to the line 00:13:30.000 --> 00:13:36.000 in which this file here is... 00:13:36.000 --> 00:13:39.000 this sexp here, that starts with 00:13:39.000 --> 00:13:40.000 find-video, 00:13:40.000 --> 00:13:42.000 plays the video... 00:13:42.000 --> 00:13:44.000 it works as a test - 00:13:44.000 --> 00:13:47.000 it plays it from the beginning - and note 00:13:47.000 --> 00:13:48.000 that it plays the video with the 00:13:48.000 --> 00:13:51.000 subtitles... 00:13:51.000 --> 00:13:54.000 and this other sexp is equivalent 00:13:54.000 --> 00:13:56.000 to the other one. 00:13:56.000 --> 00:14:00.000 And these other two sexps are 00:14:00.000 --> 00:14:03.000 higher-level ways of 00:14:03.000 --> 00:14:06.000 playing the same video... 00:14:06.000 --> 00:14:08.000 this thing here plays 00:14:08.000 --> 00:14:14.000 the "first class video" whose 00:14:14.000 --> 00:14:17.000 "code" is this "eev2021" - 00:14:17.000 --> 00:14:19.000 so: same thing as before, 00:14:19.000 --> 00:14:21.000 and this thing is the same thing 00:14:21.000 --> 00:14:23.000 as this one, 00:14:23.000 --> 00:14:27.000 but in an even shorter form. 00:14:27.000 --> 00:14:32.000 And for people who haven't 00:14:32.000 --> 00:14:36.000 configured the video player - mpv - 00:14:36.000 --> 00:14:39.000 they can still access the video by using 00:14:39.000 --> 00:14:42.000 this url here. 00:14:42.000 --> 00:14:45.000 Let me do something 00:14:45.000 --> 00:14:48.000 even more hackish... 00:14:48.000 --> 00:14:51.000 if I change this timestamp here to 00:14:51.000 --> 00:14:54.000 2:34 and I execute this sexp again 00:14:54.000 --> 00:14:57.000 it regenerates this buffer, 00:14:57.000 --> 00:14:59.000 and it changes these timestamps here 00:14:59.000 --> 00:15:05.000 to 2:34. 00:15:05.000 --> 00:15:07.000 That's it... and note that 00:15:07.000 --> 00:15:11.000 this url here has also changed... 00:15:11.000 --> 00:15:13.000 and if I open this url in the browser 00:15:13.000 --> 00:15:17.000 it plays this video in the browser, 00:15:17.000 --> 00:15:22.000 but it takes a long time... 00:15:22.000 --> 00:15:24.000 in this case it didn't play an ad 00:15:24.000 --> 00:15:29.000 before, but anyway, it takes ages - 00:15:29.000 --> 00:15:33.000 but anyway, it works - so if you don't have 00:15:33.000 --> 00:15:35.000 the mpv video player configured you can 00:15:35.000 --> 00:15:37.000 still play the videos, you can still 00:15:37.000 --> 00:15:40.000 start them from the right position, 00:15:40.000 --> 00:15:51.000 but it's painful. 00:15:51.000 --> 00:15:55.000 So note that I haven't explained 00:15:55.000 --> 00:15:58.000 how to do these things... 00:15:58.000 --> 00:16:02.000 the thing is that these three steps 00:16:02.000 --> 00:16:05.000 here... they can be 00:16:05.000 --> 00:16:07.000 replaced by something much more 00:16:07.000 --> 00:16:12.000 user-friendlier... 00:16:12.000 --> 00:16:14.000 they can be replaced by these two sexps 00:16:14.000 --> 00:16:20.000 here - this one just returns the name 00:16:20.000 --> 00:16:23.000 of a package that has been loaded, 00:16:23.000 --> 00:16:26.000 and this one here 00:16:26.000 --> 00:16:29.000 opens a temporary buffer 00:16:29.000 --> 00:16:36.000 that shows this. 00:16:36.000 --> 00:16:39.000 And this is what we're going to use 00:16:39.000 --> 00:16:43.000 to configure eev on Windows 00:16:43.000 --> 00:16:45.000 "without magic"... 00:16:45.000 --> 00:16:49.000 remember that I'm going to explain 00:16:49.000 --> 00:16:51.000 the term "without magic" soon... 00:16:51.000 --> 00:16:53.000 but anyway, 00:16:53.000 --> 00:16:56.000 "wconfig" is an abbreviation for 00:16:56.000 --> 00:16:58.000 "configuration on Microsoft Windows", 00:16:58.000 --> 00:17:00.000 or "Windows config"... 00:17:00.000 --> 00:17:02.000 And I'm going to refer to this temporary 00:17:02.000 --> 00:17:06.000 buffer here - note that its name is here - 00:17:06.000 --> 00:17:10.000 as the "main wconfig buffer" - 00:17:10.000 --> 00:17:13.000 and these instructions say that 00:17:13.000 --> 00:17:16.000 to configure eev on Windows 00:17:16.000 --> 00:17:19.000 we have to follow the instructions 00:17:19.000 --> 00:17:23.000 in each of these five wconfigs here... 00:17:23.000 --> 00:17:27.000 I'm going to refer to these ones as the 00:17:27.000 --> 00:17:30.000 "sub-wconfigs". 00:17:30.000 --> 00:17:34.000 The first one is this one, that 00:17:34.000 --> 00:17:37.000 is used to configure the browser - 00:17:37.000 --> 00:17:39.000 I mean, the path to the browser... 00:17:39.000 --> 00:17:41.000 by default the path to the browser 00:17:41.000 --> 00:17:44.000 in eev is the one that is used 00:17:44.000 --> 00:17:48.000 in GNU/Linux, which is this one... 00:17:48.000 --> 00:17:51.000 I'm supposing that the default browser 00:17:51.000 --> 00:17:53.000 is Google Chrome just because 00:17:53.000 --> 00:17:55.000 many people have it installed, 00:17:55.000 --> 00:18:01.000 but this is easy to change... 00:18:01.000 --> 00:18:06.000 and the thing is that 00:18:06.000 --> 00:18:10.000 to set the right path to Google Chrome 00:18:10.000 --> 00:18:14.000 we have to run something like this - 00:18:14.000 --> 00:18:20.000 this setq here sets a variable, 00:18:20.000 --> 00:18:22.000 and note that here we have a line that 00:18:22.000 --> 00:18:24.000 says "See: blah blah blah", 00:18:24.000 --> 00:18:28.000 and this sexp here opens 00:18:28.000 --> 00:18:30.000 one of the tutorials of eev, 00:18:30.000 --> 00:18:34.000 that is a tutorial on Emacs Lisp... 00:18:34.000 --> 00:18:38.000 Note that this header says: 00:18:38.000 --> 00:18:41.000 "This intro is a very quick introduction 00:18:41.000 --> 00:18:44.000 to Emacs Lisp. Its intent is not to teach 00:18:44.000 --> 00:18:46.000 people how to write Elisp code, only to 00:18:46.000 --> 00:18:47.000 teach them how to read Elisp code"... 00:18:47.000 --> 00:18:51.000 so it's very basic. 00:18:51.000 --> 00:18:52.000 There's a video about it, but I'm not 00:18:52.000 --> 00:18:57.000 going to discuss that video now. 00:18:57.000 --> 00:19:02.000 And in the first sections of this tutorial 00:19:02.000 --> 00:19:07.000 you learn what are S-expressions, 00:19:07.000 --> 00:19:09.000 what are numbers, what are functions, 00:19:09.000 --> 00:19:12.000 how to call functions, 00:19:12.000 --> 00:19:17.000 some basic kinds of elisp objects... 00:19:17.000 --> 00:19:19.000 these things also have 00:19:19.000 --> 00:19:22.000 links to the Emacs Lisp manual, so if you 00:19:22.000 --> 00:19:26.000 execute something like this you have 00:19:26.000 --> 00:19:28.000 the standard documentation of what are 00:19:28.000 --> 00:19:34.000 the data types of Lisp... 00:19:34.000 --> 00:19:39.000 And in the section 5 we learn 00:19:39.000 --> 00:19:41.000 how to use variables. 00:19:41.000 --> 00:19:43.000 We learn that we can 00:19:43.000 --> 00:19:49.000 set the variable a to 2 by running this - 00:19:49.000 --> 00:19:52.000 this expression returns the new value of 00:19:52.000 --> 00:19:54.000 the variable - 2... 00:19:54.000 --> 00:19:56.000 now if we execute this 00:19:56.000 --> 00:20:00.000 the value of a is 2, 00:20:00.000 --> 00:20:01.000 and if we execute this 00:20:01.000 --> 00:20:03.000 the value of a becomes 3... 00:20:03.000 --> 00:20:07.000 so the result of this is 30, 00:20:07.000 --> 00:20:09.000 and if we run this again we set the 00:20:09.000 --> 00:20:13.000 value of a to 2 again, and 00:20:13.000 --> 00:20:16.000 this sexp here returns 00:20:16.000 --> 00:20:20.000 10 times a, which is in this case is 20... 00:20:20.000 --> 00:20:22.000 and of course we can change this line, 00:20:22.000 --> 00:20:25.000 we can execute the changed version, 00:20:25.000 --> 00:20:29.000 and so on... 00:20:29.000 --> 00:20:31.000 so we have to do something like this to 00:20:31.000 --> 00:20:33.000 set the variable 00:20:33.000 --> 00:20:35.000 ee-googlechrome-program. 00:20:35.000 --> 00:20:37.000 This section says that this is the 00:20:37.000 --> 00:20:40.000 current value of the variable 00:20:40.000 --> 00:20:44.000 ee-googlechrome-program... 00:20:44.000 --> 00:20:47.000 and we have to change it 00:20:47.000 --> 00:20:50.000 to the the right path on Windows, 00:20:50.000 --> 00:20:52.000 that is going to be something 00:20:52.000 --> 00:20:56.000 like this, "C:/blah blah blah"... 00:20:56.000 --> 00:20:59.000 note that we NEED to replace 00:20:59.000 --> 00:21:01.000 all the backslashes by 00:21:01.000 --> 00:21:08.000 forward slashes, 00:21:08.000 --> 00:21:12.000 and if we configure the path correctly, 00:21:12.000 --> 00:21:14.000 I mean, if we execute this sexp here 00:21:14.000 --> 00:21:16.000 to set ee-googlechrome-program 00:21:16.000 --> 00:21:20.000 to the new value and we execute this, 00:21:20.000 --> 00:21:23.000 then Google Chrome is going to open 00:21:23.000 --> 00:21:25.000 this url here. 00:21:25.000 --> 00:21:28.000 Let me try... 00:21:28.000 --> 00:21:30.000 it says that I have configured it 00:21:30.000 --> 00:21:31.000 INcorrectly. 00:21:31.000 --> 00:21:34.000 I don't have a 00:21:34.000 --> 00:21:36.000 "googlechrome" in that address 00:21:36.000 --> 00:21:39.000 because i'm on GNU/Linux, so for me 00:21:39.000 --> 00:21:43.000 the right path is this one. 00:21:43.000 --> 00:21:47.000 If the path is configured correctly - 00:21:47.000 --> 00:21:50.000 now I'm using this value - 00:21:50.000 --> 00:21:53.000 if execute this, then 00:21:53.000 --> 00:21:55.000 Emacs calles Google Chrome, and Google 00:21:55.000 --> 00:22:03.000 Chrome opens this this page here. 00:22:03.000 --> 00:22:06.000 And after setting 00:22:06.000 --> 00:22:09.000 the variable to the right path - 00:22:09.000 --> 00:22:11.000 let's suppose that it is this one - 00:22:11.000 --> 00:22:14.000 we have to update this page, 00:22:14.000 --> 00:22:15.000 in the sense that is explained 00:22:15.000 --> 00:22:20.000 in this section of a tutorial... 00:22:20.000 --> 00:22:22.000 This page here is generated by 00:22:22.000 --> 00:22:28.000 a template - 00:22:28.000 --> 00:22:30.000 most of my pages that are generated by 00:22:30.000 --> 00:22:32.000 templates follow a convention that says 00:22:32.000 --> 00:22:34.000 that "the first line 00:22:34.000 --> 00:22:37.000 regenerates the buffer" - 00:22:37.000 --> 00:22:40.000 note that if I execute this then this 00:22:40.000 --> 00:22:43.000 string here is going to be changed to 00:22:43.000 --> 00:22:46.000 the current value of this variable - 00:22:46.000 --> 00:22:49.000 note that I can also check the 00:22:49.000 --> 00:22:51.000 value of this variable by executing this 00:22:51.000 --> 00:22:55.000 expression here with M-e - 00:22:55.000 --> 00:22:59.000 and if I regenerate the buffer 00:22:59.000 --> 00:23:03.000 then this thing here is replaced 00:23:03.000 --> 00:23:07.000 by the current value of this variable. 00:23:07.000 --> 00:23:11.000 And now that 00:23:11.000 --> 00:23:13.000 that the page has been... 00:23:13.000 --> 00:23:16.000 sorry, that the the variable 00:23:16.000 --> 00:23:19.000 is set correctly, and that 00:23:19.000 --> 00:23:22.000 the page has been updated, 00:23:22.000 --> 00:23:25.000 now I need to save my configuration... 00:23:25.000 --> 00:23:28.000 and this is explained here - 00:23:28.000 --> 00:23:31.000 so at this point people have to to read 00:23:31.000 --> 00:23:36.000 the section of the Emacs manual that explains 00:23:36.000 --> 00:23:38.000 what is the 00:23:38.000 --> 00:23:43.000 init file of Emacs... 00:23:43.000 --> 00:23:48.000 and then they have to 00:23:48.000 --> 00:23:51.000 check some things here... 00:23:51.000 --> 00:23:56.000 one of the most basic keys of ev is M-j 00:23:56.000 --> 00:23:57.000 if I type M-j 00:23:57.000 --> 00:24:00.000 without any numeric prefixes 00:24:00.000 --> 00:24:02.000 it shows 00:24:02.000 --> 00:24:04.000 this page here that has a 00:24:04.000 --> 00:24:08.000 a user-friendly header and 00:24:08.000 --> 00:24:11.000 a user-unfriendly rest 00:24:11.000 --> 00:24:14.000 and 00:24:14.000 --> 00:24:17.000 it has some links to 00:24:17.000 --> 00:24:18.000 to the main tutorial 00:24:18.000 --> 00:24:20.000 and some links to this 00:24:20.000 --> 00:24:22.000 other tutorial, that is a fake tutorial 00:24:22.000 --> 00:24:26.000 that is just an index of the main keys - 00:24:26.000 --> 00:24:32.000 and here we have a list of the current 00:24:32.000 --> 00:24:36.000 targets - I use many targets in my 00:24:36.000 --> 00:24:39.000 default setting - 00:24:39.000 --> 00:24:42.000 this target here says that 00:24:42.000 --> 00:24:46.000 when we type M-j with the prefix 55 00:24:46.000 --> 00:24:49.000 it opens the init file - here - 00:24:49.000 --> 00:24:53.000 so let's test... 00:24:53.000 --> 00:24:56.000 so this was a very long explanation of 00:24:56.000 --> 00:24:57.000 why 00:24:57.000 --> 00:25:00.000 M-5 M-5 M-j opens the 00:25:00.000 --> 00:25:03.000 init file... this sexp here also opens 00:25:03.000 --> 00:25:06.000 the init file - 00:25:06.000 --> 00:25:09.000 here is my init file - it is huge, let me 00:25:09.000 --> 00:25:11.000 open a blank page here to avoid 00:25:11.000 --> 00:25:14.000 confusion - 00:25:14.000 --> 00:25:17.000 and now the instructions say that we 00:25:17.000 --> 00:25:19.000 have to copy the _updated_ version of the 00:25:19.000 --> 00:25:21.000 block below - 00:25:21.000 --> 00:25:25.000 the updated version in the sense that 00:25:25.000 --> 00:25:28.000 we have to update this page, 00:25:28.000 --> 00:25:30.000 and when we update this page 00:25:30.000 --> 00:25:32.000 some 00:25:32.000 --> 00:25:34.000 places like these 00:25:34.000 --> 00:25:37.000 are updated to the 00:25:37.000 --> 00:25:44.000 current value of this variable here. 00:25:44.000 --> 00:25:45.000 So 00:25:45.000 --> 00:25:48.000 this template produced this thing here 00:25:48.000 --> 00:25:51.000 that we have to save in our init 00:25:51.000 --> 00:25:54.000 file 00:25:54.000 --> 00:26:00.000 so we use copy and paste - 00:26:00.000 --> 00:26:03.000 in general beginners will have 00:26:03.000 --> 00:26:05.000 things like this 00:26:05.000 --> 00:26:09.000 at the top - this is called the 00:26:09.000 --> 00:26:12.000 "menu bar" and this is called the 00:26:12.000 --> 00:26:14.000 "tool bar" and then they can use these 00:26:14.000 --> 00:26:16.000 things here to remember the keys for 00:26:16.000 --> 00:26:18.000 copy and paste... 00:26:18.000 --> 00:26:22.000 anyway let me disable them. So, I have 00:26:22.000 --> 00:26:26.000 to copy this to my init file... 00:26:26.000 --> 00:26:30.000 Done! Copied... 00:26:30.000 --> 00:26:32.000 Now let's go back, we have just 00:26:32.000 --> 00:26:34.000 finished the first 00:26:34.000 --> 00:26:38.000 sub-wconfig 00:26:38.000 --> 00:26:42.000 and we can either run this, or delete 00:26:42.000 --> 00:26:45.000 this buffer to return to the main 00:26:45.000 --> 00:26:47.000 wconfig 00:26:47.000 --> 00:26:48.000 and 00:26:48.000 --> 00:26:50.000 this is the list of 00:26:50.000 --> 00:26:51.000 the things that we have to 00:26:51.000 --> 00:26:53.000 configure... 00:26:53.000 --> 00:26:55.000 now we can go to the second one, that 00:26:55.000 --> 00:27:05.000 configures wget. 00:27:05.000 --> 00:27:09.000 Let me just show something before 00:27:09.000 --> 00:27:10.000 running 00:27:10.000 --> 00:27:14.000 this subconfig here 00:27:14.000 --> 00:27:15.000 it says 00:27:15.000 --> 00:27:19.000 in the line 4 of this 00:27:19.000 --> 00:27:21.000 main wconfig 00:27:21.000 --> 00:27:23.000 we have this link here 00:27:23.000 --> 00:27:26.000 that goes to the source code of 00:27:26.000 --> 00:27:28.000 eev-wconfig 00:27:28.000 --> 00:27:31.000 and it has this introduction here. 00:27:31.000 --> 00:27:34.000 The introduction starts with this 00:27:34.000 --> 00:27:36.000 explanation, that some parts of eev 00:27:36.000 --> 00:27:38.000 call external programs, 00:27:38.000 --> 00:27:41.000 and then it has lots of hyperlinks that 00:27:41.000 --> 00:27:46.000 show the sections of the tutorials that 00:27:46.000 --> 00:27:48.000 explain 00:27:48.000 --> 00:27:51.000 how these external programs are used. 00:27:51.000 --> 00:27:54.000 So, for example if I execute this I go to 00:27:54.000 --> 00:27:57.000 a place in which firefox is mentioned, 00:27:57.000 --> 00:28:00.000 if execute this I go to a place in which 00:28:00.000 --> 00:28:04.000 Chrome is mentioned - 00:28:04.000 --> 00:28:08.000 here - it says... 00:28:08.000 --> 00:28:10.000 sorry, remember 00:28:10.000 --> 00:28:14.000 that 00:28:14.000 --> 00:28:17.000 I ran something that would 00:28:17.000 --> 00:28:19.000 split the window in two and would run 00:28:19.000 --> 00:28:22.000 another program in the second window... 00:28:22.000 --> 00:28:24.000 here's an example in which we run 00:28:24.000 --> 00:28:30.000 python in the second window. 00:28:30.000 --> 00:28:32.000 In my previous example I was just 00:28:32.000 --> 00:28:35.000 running a shell but we can also run 00:28:35.000 --> 00:28:42.000 other targets. 00:28:42.000 --> 00:28:46.000 And these two lines here discuss why 00:28:46.000 --> 00:28:50.000 we need wget. 00:28:50.000 --> 00:28:55.000 I've shown that very quickly before 00:28:55.000 --> 00:28:57.000 when i showed how to download a video 00:28:57.000 --> 00:28:59.000 and its subtitles but the full 00:28:59.000 --> 00:29:02.000 explanation is here. 00:29:02.000 --> 00:29:05.000 There's a wget here, here is a demo of 00:29:05.000 --> 00:29:08.000 how it works... 00:29:08.000 --> 00:29:12.000 And here we have a 00:29:12.000 --> 00:29:16.000 link that explains the video links... 00:29:16.000 --> 00:29:18.000 again, a link to 00:29:18.000 --> 00:29:32.000 how subtitles work, and so on. 00:29:32.000 --> 00:29:33.000 Ah, sorry! 00:29:33.000 --> 00:29:40.000 I was missing something very important. 00:29:40.000 --> 00:29:42.000 This should be obvious now... 00:29:42.000 --> 00:29:45.000 I said that on *NIX installation 00:29:45.000 --> 00:29:46.000 is very easy - 00:29:46.000 --> 00:29:48.000 we just need to install these programs 00:29:48.000 --> 00:29:52.000 and eev knows how to find them... 00:29:52.000 --> 00:29:54.000 but on Windows things are much harder 00:29:54.000 --> 00:29:57.000 first eev needs to know the full 00:29:57.000 --> 00:30:00.000 paths of the 00:30:00.000 --> 00:30:02.000 executables of these programs 00:30:02.000 --> 00:30:04.000 we just saw how to configure 00:30:04.000 --> 00:30:08.000 the full path of Google Chrome 00:30:08.000 --> 00:30:11.000 and also wget and pdftotext 00:30:11.000 --> 00:30:13.000 are hard to install - I'm going to show 00:30:13.000 --> 00:30:16.000 how to install them very soon - 00:30:16.000 --> 00:30:18.000 and also on Windows it's better to 00:30:18.000 --> 00:30:21.000 use a browser to open pdfs instead of 00:30:21.000 --> 00:30:25.000 using a dedicated pdf viewer 00:30:25.000 --> 00:30:27.000 and also - and this is very important - I 00:30:27.000 --> 00:30:29.000 don't have access to a machine with 00:30:29.000 --> 00:30:32.000 Windows, and I have very little access to 00:30:32.000 --> 00:30:34.000 people who use Windows and who can 00:30:34.000 --> 00:30:36.000 be convinced to test this, 00:30:36.000 --> 00:30:39.000 so I'm testing this on a machine with 00:30:39.000 --> 00:30:42.000 GNU/Linux, with some hacks to 00:30:42.000 --> 00:30:44.000 try to make it behave like a Windows 00:30:44.000 --> 00:30:48.000 machine... 00:30:48.000 --> 00:30:50.000 and this is one of the most important 00:30:50.000 --> 00:30:54.000 parts - I said that I was going to explain 00:30:54.000 --> 00:30:58.000 the term "magic" 00:30:58.000 --> 00:31:01.000 eev-wconfig is an attempt to solve the 00:31:01.000 --> 00:31:03.000 problem of how to install these things 00:31:03.000 --> 00:31:06.000 on Windows both "without magic" and 00:31:06.000 --> 00:31:09.000 "with very little magic" 00:31:09.000 --> 00:31:14.000 in this sense. Remember this slogan: 00:31:14.000 --> 00:31:17.000 "any sufficiently advanced technology is 00:31:17.000 --> 00:31:21.000 indistinguishable from magic" 00:31:21.000 --> 00:31:23.000 and here in this video 00:31:23.000 --> 00:31:26.000 I am going to use the term "magic" as a 00:31:26.000 --> 00:31:28.000 shorthand for a 00:31:28.000 --> 00:31:32.000 "sufficiently advanced technology" - 00:31:32.000 --> 00:31:35.000 that is, something that is complex and 00:31:35.000 --> 00:31:37.000 non-obvious, and 00:31:37.000 --> 00:31:39.000 "that is 00:31:39.000 --> 00:31:41.000 indistinguishable from magic" 00:31:41.000 --> 00:31:43.000 in the sense of being almost impossible 00:31:43.000 --> 00:31:45.000 to understand. 00:31:45.000 --> 00:31:48.000 And i'm also going to use the term 00:31:48.000 --> 00:31:49.000 "black box" 00:31:49.000 --> 00:31:53.000 as a near-synonym for "magic" 00:31:53.000 --> 00:31:55.000 and sometimes the term "black box" is more 00:31:55.000 --> 00:31:56.000 convenient - 00:31:56.000 --> 00:31:58.000 even though it is longer: it has more 00:31:58.000 --> 00:32:02.000 letters - because when I use the term 00:32:02.000 --> 00:32:05.000 "black box" it invites us to use the 00:32:05.000 --> 00:32:07.000 expressions like "opening the black box". 00:32:07.000 --> 00:32:11.000 I'm going to use that expression a lot. 00:32:11.000 --> 00:32:15.000 I mentioned Org in the introduction 00:32:15.000 --> 00:32:18.000 and I said that I find Org very 00:32:18.000 --> 00:32:19.000 difficult - 00:32:19.000 --> 00:32:22.000 but i'm a very 00:32:22.000 --> 00:32:25.000 atypical person... 00:32:25.000 --> 00:32:29.000 and I recorded a video explaining this. 00:32:29.000 --> 00:32:32.000 People can access this video either 00:32:32.000 --> 00:32:36.000 in this page, or 00:32:36.000 --> 00:32:39.000 in this thing here: the index of the 00:32:39.000 --> 00:32:42.000 video is here, so I can just, for example, 00:32:42.000 --> 00:32:45.000 execute to sexp and play the video 00:32:45.000 --> 00:32:51.000 from this position - 3:35 - 00:32:51.000 --> 00:32:55.000 Oops! The video is not here - 00:32:55.000 --> 00:32:57.000 I don't have a local copy of it, so I need 00:32:57.000 --> 00:33:00.000 to run this thing here to 00:33:00.000 --> 00:33:05.000 download the local copy. 00:33:05.000 --> 00:33:07.000 It was downloaded - 00:33:07.000 --> 00:33:17.000 it doesn't have subtitles, it seems... 00:33:17.000 --> 00:33:20.000 and if execute this, 00:33:20.000 --> 00:33:22.000 now mpv plays the video from this 00:33:22.000 --> 00:33:25.000 position. 00:33:25.000 --> 00:33:27.000 Anyway, let me go back. 00:33:27.000 --> 00:33:30.000 So: in this video I explained why I have 00:33:30.000 --> 00:33:34.000 always found Org so hard to learn... 00:33:34.000 --> 00:33:36.000 and the thing is that many things in Org 00:33:36.000 --> 00:33:39.000 are implemented in ways that i 00:33:39.000 --> 00:33:40.000 don't understand, 00:33:40.000 --> 00:33:42.000 and practically every time that i try to 00:33:42.000 --> 00:33:45.000 learn more more features of org 00:33:45.000 --> 00:33:47.000 I get stuck, because I start to ask 00:33:47.000 --> 00:33:49.000 questions like: 00:33:49.000 --> 00:33:52.000 hey, how is this implemented? 00:33:52.000 --> 00:33:54.000 And I get stuck trying to trying to 00:33:54.000 --> 00:33:57.000 answer these questions, that are not 00:33:57.000 --> 00:34:01.000 typical user questions... 00:34:01.000 --> 00:34:05.000 and I get stuck on that instead of 00:34:05.000 --> 00:34:07.000 simply learning how to use the features 00:34:07.000 --> 00:34:09.000 of Org as a user. 00:34:09.000 --> 00:34:11.000 So: I find 00:34:11.000 --> 00:34:14.000 Org confusing because my brain is wired 00:34:14.000 --> 00:34:16.000 in a weird way... 00:34:16.000 --> 00:34:19.000 and, in the language of black boxes what 00:34:19.000 --> 00:34:24.000 happens is that when I try to learn Org... 00:34:24.000 --> 00:34:27.000 I try to learn a new feature, I see lots 00:34:27.000 --> 00:34:29.000 of black boxes, 00:34:29.000 --> 00:34:31.000 I try to open these black boxes, and I 00:34:31.000 --> 00:34:34.000 fail miserably... and I get frustrated and 00:34:34.000 --> 00:34:37.000 exhausted I, do not learn the feature and 00:34:37.000 --> 00:34:39.000 I postpone learning the feature 00:34:39.000 --> 00:34:41.000 to another day, and in the other day I try 00:34:41.000 --> 00:34:44.000 it again, I see other black boxes, I try 00:34:44.000 --> 00:34:46.000 to understand them again, and blah blah, 00:34:46.000 --> 00:34:49.000 rinse and repeat... 00:34:49.000 --> 00:34:51.000 and I also have exactly the same 00:34:51.000 --> 00:34:54.000 relationship with M-x customized, that 00:34:54.000 --> 00:34:58.000 the standard way in Emacs to configure 00:34:58.000 --> 00:35:00.000 certain things 00:35:00.000 --> 00:35:03.000 and to customize certain things. 00:35:03.000 --> 00:35:08.000 Let me show how customize works 00:35:08.000 --> 00:35:12.000 We can either type M-x customize or 00:35:12.000 --> 00:35:14.000 run this sexp here, that 00:35:14.000 --> 00:35:17.000 simulates what happens when we type 00:35:17.000 --> 00:35:19.000 M-x customize. 00:35:19.000 --> 00:35:21.000 Customize creates a temporary buffer 00:35:21.000 --> 00:35:23.000 like this one... 00:35:23.000 --> 00:35:26.000 it has this mysterious field here, it 00:35:26.000 --> 00:35:28.000 has parts that are not editable - for 00:35:28.000 --> 00:35:34.000 example, if I type a letter here - oops 00:35:34.000 --> 00:35:37.000 if I type a letter here 00:35:37.000 --> 00:35:39.000 it says "you can't edit this part of the 00:35:39.000 --> 00:35:42.000 Custom buffer"... it has buttons, 00:35:42.000 --> 00:35:44.000 it has different fonts, different colors, 00:35:44.000 --> 00:35:49.000 it has links, and so on... 00:35:49.000 --> 00:35:51.000 and if i follow these links in 00:35:51.000 --> 00:35:53.000 the right way I 00:35:53.000 --> 00:35:57.000 can get to places like this one, 00:35:57.000 --> 00:36:02.000 which is a sub menu with sub options, 00:36:02.000 --> 00:36:08.000 I can get to a place like this one, 00:36:08.000 --> 00:36:13.000 that offers many things 00:36:13.000 --> 00:36:16.000 that can be configured, each one with an 00:36:16.000 --> 00:36:23.000 explanation... 00:36:23.000 --> 00:36:26.000 I can execute things like this one, that 00:36:26.000 --> 00:36:28.000 opens this page, in which I can customize 00:36:28.000 --> 00:36:33.000 a variable... 00:36:33.000 --> 00:36:35.000 and things like this in which I can 00:36:35.000 --> 00:36:38.000 customize a face to change its color, to 00:36:38.000 --> 00:36:42.000 change its font... and so on - 00:36:42.000 --> 00:36:44.000 and for me all these things - all these 00:36:44.000 --> 00:36:47.000 buttons, this rectangle here, in which I 00:36:47.000 --> 00:36:51.000 can put text 00:36:51.000 --> 00:36:52.000 all these things are... 00:36:52.000 --> 00:36:55.000 magic - and they are black boxes that I 00:36:55.000 --> 00:37:00.000 find very hard to open. 00:37:00.000 --> 00:37:02.000 And over the years I have experimented 00:37:02.000 --> 00:37:04.000 with several alternatives to 00:37:04.000 --> 00:37:10.000 customize that "use less magic"... 00:37:10.000 --> 00:37:13.000 I've documented some of my attempts in 00:37:13.000 --> 00:37:16.000 this page here, 00:37:16.000 --> 00:37:18.000 and 00:37:18.000 --> 00:37:20.000 this thing that I'm presenting now - 00:37:20.000 --> 00:37:23.000 eev-wconfig.el - this is 00:37:23.000 --> 00:37:26.000 the next step: it uses all the ideas in 00:37:26.000 --> 00:37:32.000 this page, and a few other new ideas. 00:37:32.000 --> 00:37:33.000 And eev-wconfig can be used both 00:37:33.000 --> 00:37:38.000 "with no magic", 00:37:38.000 --> 00:37:40.000 which is easier to explain, and we're 00:37:40.000 --> 00:37:42.000 going to see that first, 00:37:42.000 --> 00:37:44.000 and with "some magic", or "with 00:37:44.000 --> 00:37:46.000 very little magic" 00:37:46.000 --> 00:37:48.000 and both ways create temporary buffers 00:37:48.000 --> 00:37:50.000 that have parts that perform 00:37:50.000 --> 00:37:52.000 configuration steps 00:37:52.000 --> 00:37:54.000 and parts 00:37:54.000 --> 00:37:56.000 that "open the black boxes". 00:37:56.000 --> 00:37:59.000 How? Because they contain elisp hyperlinks 00:37:59.000 --> 00:38:01.000 that go to the documentation, that 00:38:01.000 --> 00:38:04.000 perform tests, that show the values of 00:38:04.000 --> 00:38:11.000 variables, and so on. 00:38:11.000 --> 00:38:13.000 The documentation about usage is 00:38:13.000 --> 00:38:15.000 incomplete at the moment, so let me 00:38:15.000 --> 00:38:17.000 return. 00:38:17.000 --> 00:38:22.000 We just saw that these 00:38:22.000 --> 00:38:25.000 things have lots of links in comments 00:38:25.000 --> 00:38:28.000 like this one, that goes 00:38:28.000 --> 00:38:31.000 to a tutorial, and some 00:38:31.000 --> 00:38:36.000 other links go to manuals of Emacs... 00:38:36.000 --> 00:38:39.000 it has some tests in comments - remember 00:38:39.000 --> 00:38:41.000 remember that we ran this and it tried 00:38:41.000 --> 00:38:43.000 to open Google Chrome 00:38:43.000 --> 00:38:48.000 to visit this url in Google Chrome, 00:38:48.000 --> 00:38:50.000 and it failed, because 00:38:50.000 --> 00:38:52.000 the path for Google Chrome is configured 00:38:52.000 --> 00:39:00.000 incorrectly. 00:39:00.000 --> 00:39:02.000 This is an example of a link that goes to one 00:39:02.000 --> 00:39:09.000 of the manuals of Emacs, 00:39:09.000 --> 00:39:12.000 this thing here opens the init file, and 00:39:12.000 --> 00:39:14.000 so on... 00:39:14.000 --> 00:39:20.000 so: we just finished the first sub-wconfig 00:39:20.000 --> 00:39:22.000 and now we need to run the second 00:39:22.000 --> 00:39:27.000 sub-wconfig 00:39:27.000 --> 00:39:30.000 and this wconfig 00:39:30.000 --> 00:39:33.000 can only be run after configuring the 00:39:33.000 --> 00:39:35.000 browser - otherwise it's going to behave 00:39:35.000 --> 00:39:37.000 in weird ways... 00:39:37.000 --> 00:39:40.000 and the first step here is to download 00:39:40.000 --> 00:39:43.000 wget.exe... 00:39:43.000 --> 00:39:46.000 and note that it says: run each of the 00:39:46.000 --> 00:39:50.000 uncommented texts below with M-e 00:39:50.000 --> 00:39:52.000 the idea is that 00:39:52.000 --> 00:39:56.000 this buffer here is 00:39:56.000 --> 00:40:00.000 colored as Lisp - everything that 00:40:00.000 --> 00:40:03.000 Emacs thinks that are elisp comments 00:40:03.000 --> 00:40:06.000 is in brown, and everything that is 00:40:06.000 --> 00:40:10.000 not comments is in other colors... 00:40:10.000 --> 00:40:13.000 so this is an uncommented part and this 00:40:13.000 --> 00:40:21.000 is a commented part. 00:40:21.000 --> 00:40:24.000 Note that here we have some sexps that are 00:40:24.000 --> 00:40:26.000 longer than one line. For example, this 00:40:26.000 --> 00:40:29.000 one takes two lines, and this one also 00:40:29.000 --> 00:40:31.000 takes two lines... 00:40:31.000 --> 00:40:37.000 and we need to run each one of them. 00:40:37.000 --> 00:40:40.000 This one just returns the name of a 00:40:40.000 --> 00:40:42.000 package that has been loaded, 00:40:42.000 --> 00:40:45.000 this one just returns the name 00:40:45.000 --> 00:40:49.000 of a function that has been defined, 00:40:49.000 --> 00:40:54.000 and some of these ones return 00:40:54.000 --> 00:40:56.000 some trivial value that just says that 00:40:56.000 --> 00:40:58.000 everything went right... 00:40:58.000 --> 00:41:01.000 for example this one returns nil, this 00:41:01.000 --> 00:41:06.000 one returns nil, again and this one is a 00:41:06.000 --> 00:41:08.000 bit more problematic because it runs 00:41:08.000 --> 00:41:11.000 something that may take a long time like 00:41:11.000 --> 00:41:14.000 10 seconds, 20 seconds, i don't know... 00:41:14.000 --> 00:41:17.000 Let me try. 00:41:17.000 --> 00:41:20.000 Note the messages here now we have to 00:41:20.000 --> 00:41:23.000 wait patiently... Ta-da. 00:41:23.000 --> 00:41:27.000 It has downloaded wget.exe and saved it 00:41:27.000 --> 00:41:31.000 in this file here 00:41:31.000 --> 00:41:34.000 and now that wget.exe has been 00:41:34.000 --> 00:41:37.000 downloaded we can use it to download 00:41:37.000 --> 00:41:39.000 some other files... 00:41:39.000 --> 00:41:42.000 but remember that I'm not on windows, so 00:41:42.000 --> 00:41:45.000 I have to use some some 00:41:45.000 --> 00:41:47.000 mysterious tricks to 00:41:47.000 --> 00:41:49.000 make these things behave somewhat like 00:41:49.000 --> 00:41:51.000 Windows. 00:41:51.000 --> 00:41:54.000 Let me execute this string... so, please 00:41:54.000 --> 00:41:56.000 don't pay attention to what i'm doing 00:41:56.000 --> 00:42:01.000 now... this is like 00:42:01.000 --> 00:42:09.000 "you are not expected to understand this" 00:42:09.000 --> 00:42:17.000 anyway, 00:42:17.000 --> 00:42:19.000 um - 00:42:19.000 --> 00:42:26.000 sorry - 00:42:26.000 --> 00:42:39.000 oops - 00:42:39.000 --> 00:42:51.000 oh my god i forgot the details, sorry... 00:42:51.000 --> 00:42:57.000 that's it - 00:42:57.000 --> 00:43:01.000 Ah, yeah, sorry - now I remember: 00:43:01.000 --> 00:43:03.000 I had to replace the real wget.exe, 00:43:03.000 --> 00:43:05.000 that takes about 5MB, by a 00:43:05.000 --> 00:43:09.000 fake wget.exe that calls the 00:43:09.000 --> 00:43:13.000 wget that runs on GNU/Linux 00:43:13.000 --> 00:43:16.000 so, sorry for the delay, let me go back to 00:43:16.000 --> 00:43:22.000 the to the configuration of wget... 00:43:22.000 --> 00:43:26.000 now that I have wget working 00:43:26.000 --> 00:43:29.000 I can execute this 00:43:29.000 --> 00:43:33.000 block here with f8... 00:43:33.000 --> 00:43:35.000 Note the instructions here - 00:43:35.000 --> 00:43:37.000 this thing points to the 00:43:37.000 --> 00:43:40.000 the main tutorial of eev, in the part that 00:43:40.000 --> 00:43:43.000 it explains how to run 00:43:43.000 --> 00:43:46.000 shell-like programs - programs like the 00:43:46.000 --> 00:43:50.000 shell, programs like Python, etc, with f8s... 00:43:50.000 --> 00:43:53.000 so we need to run these things with f8. 00:43:53.000 --> 00:44:04.000 The first commands are very quick... 00:44:04.000 --> 00:44:10.000 and now I call wget to download 00:44:10.000 --> 00:44:22.000 many small files... 00:44:22.000 --> 00:44:24.000 and this block here contains some tests - 00:44:24.000 --> 00:44:27.000 some very basic tests that just 00:44:27.000 --> 00:44:30.000 call these programs to 00:44:30.000 --> 00:44:33.000 check that they are executable 00:44:33.000 --> 00:44:36.000 and to check that they can perform very 00:44:36.000 --> 00:44:38.000 basic functions, like just displaying the 00:44:38.000 --> 00:44:40.000 help. 00:44:40.000 --> 00:44:42.000 This test here 00:44:42.000 --> 00:44:43.000 works - 00:44:43.000 --> 00:44:50.000 it shows the help of wget - here - 00:44:50.000 --> 00:44:53.000 this one does not work because this file 00:44:53.000 --> 00:44:56.000 is a file for windows... I have to run my 00:44:56.000 --> 00:44:59.000 hacks to to make it executable on 00:44:59.000 --> 00:45:02.000 GNU/Linux. so, 00:45:02.000 --> 00:45:05.000 again, please don't pay attention to what 00:45:05.000 --> 00:45:15.000 i'm going to do... 00:45:15.000 --> 00:45:17.000 now these tests 00:45:17.000 --> 00:45:19.000 work. So if you are on Windows and if 00:45:19.000 --> 00:45:21.000 everything worked 00:45:21.000 --> 00:45:25.000 this thing here should show the help of 00:45:25.000 --> 00:45:27.000 pdftotext... 00:45:27.000 --> 00:45:30.000 and these other lines here should show 00:45:30.000 --> 00:45:33.000 the version of these 00:45:33.000 --> 00:45:36.000 programs here 00:45:36.000 --> 00:45:39.000 so if I execute this I get a message 00:45:39.000 --> 00:45:41.000 that is just one line long 00:45:41.000 --> 00:45:45.000 same here, same here - 00:45:45.000 --> 00:45:48.000 and now I need to run this other block 00:45:48.000 --> 00:45:50.000 here, that downloads a pdf file 00:45:50.000 --> 00:45:52.000 that is going 00:45:52.000 --> 00:45:56.000 to be used in some tests, and a very short 00:45:56.000 --> 00:45:58.000 mp4 file... a very short video that is 00:45:58.000 --> 00:46:01.000 going to be used in other tests. 00:46:01.000 --> 00:46:03.000 so... 00:46:03.000 --> 00:46:09.000 wget, wget again... 00:46:09.000 --> 00:46:14.000 and now this section 3, here 00:46:14.000 --> 00:46:17.000 has tests for one of the functions of 00:46:17.000 --> 00:46:22.000 the functions of eev that call wget 00:46:22.000 --> 00:46:24.000 we need to run this sexp here to 00:46:24.000 --> 00:46:25.000 configure 00:46:25.000 --> 00:46:28.000 the path that is used by this function 00:46:28.000 --> 00:46:29.000 here 00:46:29.000 --> 00:46:32.000 and now we run we need to run the tests 00:46:32.000 --> 00:46:36.000 in the second sexp below... so this is a 00:46:36.000 --> 00:46:38.000 sexp that is here just for the sake of 00:46:38.000 --> 00:46:40.000 completeness, because it points to the 00:46:40.000 --> 00:46:42.000 beginning of a section, 00:46:42.000 --> 00:46:48.000 and this sexp here points to 00:46:48.000 --> 00:46:51.000 a series of tests in that section, and we 00:46:51.000 --> 00:46:54.000 need to run these tests to to check 00:46:54.000 --> 00:46:58.000 that they really work. 00:46:58.000 --> 00:47:01.000 Each of these `find-wget's here call 00:47:01.000 --> 00:47:03.000 wgets to download the file from the 00:47:03.000 --> 00:47:06.000 internet and it shows the the contents 00:47:06.000 --> 00:47:08.000 of this file in a temporary buffer. Let's 00:47:08.000 --> 00:47:12.000 try here... 00:47:12.000 --> 00:47:14.000 note that the name of this buffer is 00:47:14.000 --> 00:47:17.000 wget blah blah blah blah 00:47:17.000 --> 00:47:20.000 wget, colon, space, the url... 00:47:20.000 --> 00:47:24.000 with asterisks 00:47:24.000 --> 00:47:28.000 in the beginning and the end 00:47:28.000 --> 00:47:30.000 this is similar, but it also searches for 00:47:30.000 --> 00:47:33.000 the first occurrence of this string in 00:47:33.000 --> 00:47:34.000 that file... 00:47:34.000 --> 00:47:36.000 that's it - 00:47:36.000 --> 00:47:40.000 this one is similar, but it searches 00:47:40.000 --> 00:47:43.000 for the first occurrence of this 00:47:43.000 --> 00:47:47.000 in that file - 00:47:47.000 --> 00:47:49.000 it works - 00:47:49.000 --> 00:47:52.000 this test here tries to to download a 00:47:52.000 --> 00:47:56.000 file that does not exist, 00:47:56.000 --> 00:48:00.000 so it says that "wget can't download..." 00:48:00.000 --> 00:48:02.000 and these two tests are similar 00:48:02.000 --> 00:48:03.000 to the other 00:48:03.000 --> 00:48:06.000 ones above but they tell Emacs 00:48:06.000 --> 00:48:09.000 that this thing here is elisp code and 00:48:09.000 --> 00:48:12.000 should be colorized... 00:48:12.000 --> 00:48:15.000 the technical term is "fontified" - 00:48:15.000 --> 00:48:18.000 fontified as Lisp, so Emacs colors these 00:48:18.000 --> 00:48:22.000 things as comments, 00:48:22.000 --> 00:48:29.000 these things as code, and so on... 00:48:29.000 --> 00:48:32.000 so, that's it - all these tests work - 00:48:32.000 --> 00:48:35.000 note that all these tests are hidden in 00:48:35.000 --> 00:48:39.000 this sexp here - 00:48:39.000 --> 00:48:40.000 and now 00:48:40.000 --> 00:48:43.000 this link here explains the idea of 00:48:43.000 --> 00:48:45.000 anchors that I explained very briefly in 00:48:45.000 --> 00:48:47.000 the tests above... 00:48:47.000 --> 00:48:51.000 so this section of the main tutorial 00:48:51.000 --> 00:48:58.000 explains what are anchors 00:48:58.000 --> 00:49:00.000 note that 00:49:00.000 --> 00:49:03.000 we probably don't have a local copy 00:49:03.000 --> 00:49:06.000 of this video here 00:49:06.000 --> 00:49:09.000 so eev offers to download the local 00:49:09.000 --> 00:49:10.000 copy... 00:49:10.000 --> 00:49:13.000 but if we haven't configured 00:49:13.000 --> 00:49:18.000 the mpv media player we can use this url 00:49:18.000 --> 00:49:20.000 here to play the video starting from the 00:49:20.000 --> 00:49:26.000 right position. 00:49:26.000 --> 00:49:28.000 Now in section 4 we 00:49:28.000 --> 00:49:30.000 configure the 00:49:30.000 --> 00:49:33.000 pdf viewer that eev is going to use 00:49:33.000 --> 00:49:37.000 to make eev use the browser as our 00:49:37.000 --> 00:49:39.000 preferred pdf viewer 00:49:39.000 --> 00:49:41.000 and the configuration is just this line 00:49:41.000 --> 00:49:43.000 here, the tests are these... 00:49:43.000 --> 00:49:46.000 let me go straight to 00:49:46.000 --> 00:49:48.000 the one that is most interesting... it's 00:49:48.000 --> 00:49:51.000 going to open this local file here, and 00:49:51.000 --> 00:49:53.000 it's going to go to page 3 in that 00:49:53.000 --> 00:49:56.000 local file - oops, 00:49:56.000 --> 00:49:59.000 sorry I need to reconfigure one thing 00:49:59.000 --> 00:50:10.000 again... let me cheat - 00:50:10.000 --> 00:50:12.000 so please don't pay attention to what 00:50:12.000 --> 00:50:16.000 i'm doing now, 00:50:16.000 --> 00:50:36.000 please ignore me - um - oh sorry - 00:50:36.000 --> 00:50:39.000 that's it. It opened the local file and 00:50:39.000 --> 00:50:43.000 it opened it at page 3 - note 00:50:43.000 --> 00:50:46.000 that there are two other pages here 00:50:46.000 --> 00:50:49.000 and it's opening it at page 3... 00:50:49.000 --> 00:50:53.000 so it's working. 00:50:53.000 --> 00:50:55.000 People who want the technical details 00:50:55.000 --> 00:50:59.000 can run these three links here to 00:50:59.000 --> 00:51:01.000 to get more details... some of them are 00:51:01.000 --> 00:51:03.000 readable, and some of them are very 00:51:03.000 --> 00:51:05.000 technical, but anyway 00:51:05.000 --> 00:51:06.000 the explanations are there, and I'm 00:51:06.000 --> 00:51:08.000 supposing that people 00:51:08.000 --> 00:51:10.000 can read the more readable parts and can 00:51:10.000 --> 00:51:17.000 ignore the parts that are too technical. 00:51:17.000 --> 00:51:20.000 And we also need to tell 00:51:20.000 --> 00:51:23.000 eev to use this program here to 00:51:23.000 --> 00:51:26.000 to view pdfs as text... 00:51:26.000 --> 00:51:29.000 and this sexp here will open the pdf, 00:51:29.000 --> 00:51:33.000 convert it to text and go to page 3... 00:51:33.000 --> 00:51:35.000 that's it. 00:51:35.000 --> 00:51:37.000 This is page 2, and this is page 1, and 00:51:37.000 --> 00:51:39.000 this is a formfeed that separates the 00:51:39.000 --> 00:51:42.000 pages... 00:51:42.000 --> 00:51:47.000 and i'm going to skip this test. 00:51:47.000 --> 00:51:50.000 And now that we have configured all 00:51:50.000 --> 00:51:51.000 these things we have to save these 00:51:51.000 --> 00:51:54.000 configurations in our init file... 00:51:54.000 --> 00:51:56.000 and note that these configurations were 00:51:56.000 --> 00:51:58.000 scattered here - 00:51:58.000 --> 00:52:05.000 they were interspersed with tests. 00:52:05.000 --> 00:52:09.000 We have this setq, this defalias, 00:52:09.000 --> 00:52:14.000 and this other setq here, 00:52:14.000 --> 00:52:17.000 and in this section here we have these 00:52:17.000 --> 00:52:18.000 three lines 00:52:18.000 --> 00:52:21.000 in the same place, and also a first line 00:52:21.000 --> 00:52:25.000 that is a link to this sub-wconfig 00:52:25.000 --> 00:52:29.000 here, the wconfig that configures 00:52:29.000 --> 00:52:33.000 wget. The instructions here say that 00:52:33.000 --> 00:52:35.000 this is similar to something that we did 00:52:35.000 --> 00:52:38.000 before to save some configurations to 00:52:38.000 --> 00:52:40.000 the init file... 00:52:40.000 --> 00:52:44.000 let me go to my init file - 00:52:44.000 --> 00:52:45.000 I've been using it for a long time, ok? 00:52:45.000 --> 00:52:48.000 so I remember that the keys to go to 00:52:48.000 --> 00:52:52.000 the init file are M-5 M-5 M-j... 00:52:52.000 --> 00:52:55.000 and now: 00:52:55.000 --> 00:53:01.000 paste! So this is the result of 00:53:01.000 --> 00:53:04.000 running these configurations here... 00:53:04.000 --> 00:53:06.000 and note that this first line 00:53:06.000 --> 00:53:10.000 the line with the "See:"... 00:53:10.000 --> 00:53:16.000 go to this sub-wconfig, so we can 00:53:16.000 --> 00:53:18.000 run all these configurations and then 00:53:18.000 --> 00:53:20.000 forget what we did 00:53:20.000 --> 00:53:23.000 and then we can open our init file again 00:53:23.000 --> 00:53:26.000 and if we want to understand what we did 00:53:26.000 --> 00:53:28.000 we just need to run 00:53:28.000 --> 00:53:30.000 this sexp or this sexp 00:53:30.000 --> 00:53:33.000 and we go back to the 00:53:33.000 --> 00:53:36.000 temporary buffers that were used to 00:53:36.000 --> 00:53:42.000 configure all these things. 00:53:42.000 --> 00:53:46.000 So, now i've explained 00:53:46.000 --> 00:53:48.000 most of the basic ideas of the 00:53:48.000 --> 00:53:51.000 configuration... I can go a bit faster now. 00:53:51.000 --> 00:53:53.000 Now we have to configure some things 00:53:53.000 --> 00:53:55.000 for the shell... 00:53:55.000 --> 00:53:58.000 the thing is that on Windows it's 00:53:58.000 --> 00:54:00.000 better to use Eshell, that is a shell 00:54:00.000 --> 00:54:03.000 that is 00:54:03.000 --> 00:54:05.000 written in lisp, than to use the default 00:54:05.000 --> 00:54:09.000 shell from Windows... 00:54:09.000 --> 00:54:14.000 and we need to run these things, 00:54:14.000 --> 00:54:16.000 and we need to run 00:54:16.000 --> 00:54:19.000 these things here... 00:54:19.000 --> 00:54:20.000 and note that 00:54:20.000 --> 00:54:22.000 this line here says that this block 00:54:22.000 --> 00:54:29.000 here only needs to be run once - 00:54:29.000 --> 00:54:31.000 and the technical details are here - I'm 00:54:31.000 --> 00:54:34.000 not going to discuss them now - 00:54:34.000 --> 00:54:45.000 and here is a test... 00:54:45.000 --> 00:54:48.000 the important part is that 00:54:48.000 --> 00:54:51.000 these configs here define 00:54:51.000 --> 00:54:54.000 wget - note that it's not "wget.exe", 00:54:54.000 --> 00:54:56.000 it's simply "wget"... 00:54:56.000 --> 00:54:59.000 it defines wget as an alias that 00:54:59.000 --> 00:55:01.000 points to the wget.exe there that 00:55:01.000 --> 00:55:04.000 I have downloaded 00:55:04.000 --> 00:55:07.000 and we also need to 00:55:07.000 --> 00:55:14.000 run these very technical things here 00:55:14.000 --> 00:55:23.000 and the explanation is that... 00:55:23.000 --> 00:55:29.000 remember that 00:55:29.000 --> 00:55:33.000 I've shown how to run 00:55:33.000 --> 00:55:36.000 shells in Emacs... 00:55:36.000 --> 00:55:38.000 for example this shell here - and I've 00:55:38.000 --> 00:55:40.000 shown how we can 00:55:40.000 --> 00:55:42.000 use eepitch to control other targets, and 00:55:42.000 --> 00:55:45.000 the example that I gave was to 00:55:45.000 --> 00:55:48.000 to use it to run Python, in this 00:55:48.000 --> 00:55:53.000 window here... 00:55:53.000 --> 00:55:55.000 and the thing is that 00:55:55.000 --> 00:55:57.000 I don't know how to install Python on 00:55:57.000 --> 00:55:59.000 windows - at this moment I don't 00:55:59.000 --> 00:56:02.000 have anyone who can test it for me, I 00:56:02.000 --> 00:56:05.000 don't know if it works... 00:56:05.000 --> 00:56:09.000 so I did my basic tests with Lua, that I 00:56:09.000 --> 00:56:11.000 can install by just downloading two 00:56:11.000 --> 00:56:14.000 files and we did that when we were 00:56:14.000 --> 00:56:19.000 downloading many files with wget. 00:56:19.000 --> 00:56:21.000 Oh no, sorry - 00:56:21.000 --> 00:56:23.000 I'm talking about something that is only 00:56:23.000 --> 00:56:26.000 going to appear in another sub-wconfig - 00:56:26.000 --> 00:56:28.000 sorry - 00:56:28.000 --> 00:56:31.000 anyway, here the test just checks that 00:56:31.000 --> 00:56:36.000 both Eshell and the normal shell 00:56:36.000 --> 00:56:39.000 run the same thing here... they both run 00:56:39.000 --> 00:56:41.000 Eshell... 00:56:41.000 --> 00:56:45.000 we need to run this thing here too... 00:56:45.000 --> 00:56:47.000 the explanation is here - I'm not going to 00:56:47.000 --> 00:56:49.000 open the tutorial with the 00:56:49.000 --> 00:56:52.000 explanation - 00:56:52.000 --> 00:56:54.000 now there are some tests that we can do, 00:56:54.000 --> 00:56:57.000 but i'm not going to run these tests now... 00:56:57.000 --> 00:56:59.000 and then we have to save these things 00:56:59.000 --> 00:57:04.000 here in our init file... 00:57:04.000 --> 00:57:07.000 Again, there's a line that says 00:57:07.000 --> 00:57:09.000 that this is similar to 00:57:09.000 --> 00:57:12.000 these instructions here, so the detailed 00:57:12.000 --> 00:57:13.000 instructions are 00:57:13.000 --> 00:57:20.000 in our first sub-wconfig... 00:57:20.000 --> 00:57:23.000 and we need to copy this thing, 00:57:23.000 --> 00:57:30.000 and then go to our init file, 00:57:30.000 --> 00:57:33.000 and add these things to our init file. 00:57:33.000 --> 00:57:41.000 Done. Let me go back to the main wconfig. 00:57:41.000 --> 00:57:43.000 Note that we have completed this one, 00:57:43.000 --> 00:57:46.000 this one, and this one... 00:57:46.000 --> 00:57:49.000 and this thing here just 00:57:49.000 --> 00:57:53.000 checks that that we can run Lua from Emacs 00:57:53.000 --> 00:57:56.000 it's what I was saying before about 00:57:56.000 --> 00:58:01.000 running Python or running Lua... 00:58:01.000 --> 00:58:04.000 so this is a basic test that calls Lua 00:58:04.000 --> 00:58:11.000 with its full path. 00:58:11.000 --> 00:58:14.000 Remember that I had to to run some hacks 00:58:14.000 --> 00:58:16.000 here to make things behave as as if we 00:58:16.000 --> 00:58:18.000 were on Windows... 00:58:18.000 --> 00:58:21.000 so I'm not sure if all these things 00:58:21.000 --> 00:58:24.000 are going to run on Windows or not - 00:58:24.000 --> 00:58:27.000 and then we have to run these sexps 00:58:27.000 --> 00:58:31.000 here, and then run the test that is below... 00:58:31.000 --> 00:58:34.000 let me run this, and this, and this, and 00:58:34.000 --> 00:58:39.000 this... and then the test is here - 00:58:39.000 --> 00:58:44.000 now I have Lua running inside an 00:58:44.000 --> 00:58:46.000 Emacs window, 00:58:46.000 --> 00:58:48.000 and it was not invoked from a shell, it 00:58:48.000 --> 00:58:52.000 was invoked directly. 00:58:52.000 --> 00:58:55.000 Everything works, 00:58:55.000 --> 00:58:57.000 and now we need to save these things in 00:58:57.000 --> 00:59:00.000 our init file. 00:59:00.000 --> 00:59:07.000 So, again: copy, go to the init file, 00:59:07.000 --> 00:59:09.000 paste. 00:59:09.000 --> 00:59:17.000 Let me go back to the main wconfig... 00:59:17.000 --> 00:59:21.000 and now we need to configure mpv... the mpv 00:59:21.000 --> 00:59:26.000 media player 00:59:26.000 --> 00:59:28.000 this is similar to how we configured the 00:59:28.000 --> 00:59:34.000 browser. We have to 00:59:34.000 --> 00:59:38.000 configure the paths to mpv - 00:59:38.000 --> 00:59:40.000 I mean people have to install mpv and 00:59:40.000 --> 00:59:45.000 then configure the path to mpv - 00:59:45.000 --> 00:59:47.000 I'm not going to repeat it... 00:59:47.000 --> 00:59:50.000 it also has some tests... 00:59:50.000 --> 00:59:54.000 and after configuring this thing here we 00:59:54.000 --> 00:59:57.000 go to our init file and we save this 00:59:57.000 --> 01:00:00.000 thing to our init file... 01:00:00.000 --> 01:00:02.000 and that's it. 01:00:02.000 --> 01:00:05.000 If we've done that 01:00:05.000 --> 01:00:07.000 we will have five blocks here, each one 01:00:07.000 --> 01:00:09.000 corresponding to one of the 01:00:09.000 --> 01:00:13.000 the sub-wconfigs, and 01:00:13.000 --> 01:00:17.000 each one contains some configurations 01:00:17.000 --> 01:00:19.000 or customizations, 01:00:19.000 --> 01:00:23.000 and also lots of links to help - 01:00:23.000 --> 01:00:24.000 I mean, 01:00:24.000 --> 01:00:26.000 we can treat these links here as 01:00:26.000 --> 01:00:29.000 links that open the black boxes and 01:00:29.000 --> 01:00:32.000 explain what these things are 01:00:32.000 --> 01:00:35.000 and all the commands are very explicit 01:00:35.000 --> 01:00:37.000 here... if we want to understand what 01:00:37.000 --> 01:00:41.000 `require' does, 01:00:41.000 --> 01:00:43.000 the main tutorial of 01:00:43.000 --> 01:00:46.000 of eev - this one 01:00:46.000 --> 01:00:49.000 explains in section... 4, if I remember 01:00:49.000 --> 01:00:57.000 correctly... 01:00:57.000 --> 01:01:01.000 that's it. 01:01:01.000 --> 01:01:03.000 Suppose that we want information 01:01:03.000 --> 01:01:10.000 about an Emacs function. 01:01:10.000 --> 01:01:14.000 This video here explains that in details, 01:01:14.000 --> 01:01:18.000 and explains also the rationale 01:01:18.000 --> 01:01:21.000 behind all these things... 01:01:21.000 --> 01:01:23.000 the standard way to get help about the 01:01:23.000 --> 01:01:28.000 function is to type C-h f... 01:01:28.000 --> 01:01:31.000 Emacs takes the name of the function from 01:01:31.000 --> 01:01:32.000 the the position 01:01:32.000 --> 01:01:35.000 under the cursor - the "point" - we can just 01:01:35.000 --> 01:01:41.000 press enter here and get help... 01:01:41.000 --> 01:01:43.000 this help contains too much magic 01:01:43.000 --> 01:01:45.000 for example this thing here is a 01:01:45.000 --> 01:01:46.000 hyperlink 01:01:46.000 --> 01:01:49.000 and it's for me it's a black box that I 01:01:49.000 --> 01:01:51.000 do not know how to open 01:01:51.000 --> 01:01:53.000 i know how to type enter here 01:01:53.000 --> 01:01:56.000 to go to the source code, 01:01:56.000 --> 01:01:59.000 but I don't know what exactly 01:01:59.000 --> 01:02:01.000 Emacs runs when it does that... I do not 01:02:01.000 --> 01:02:04.000 know what is the Lisp code corresponding 01:02:04.000 --> 01:02:07.000 to typing Enter here - 01:02:07.000 --> 01:02:10.000 and I also don't know why these things 01:02:10.000 --> 01:02:14.000 are in italics and other things are not... 01:02:14.000 --> 01:02:16.000 so, many years ago 01:02:16.000 --> 01:02:18.000 I started to experiment 01:02:18.000 --> 01:02:21.000 with the way "without magic" 01:02:21.000 --> 01:02:23.000 of doing something similar... 01:02:23.000 --> 01:02:28.000 and my way is by typing M-h M-f 01:02:28.000 --> 01:02:29.000 and then Enter 01:02:29.000 --> 01:02:34.000 and this thing here contains hyperlinks 01:02:34.000 --> 01:02:36.000 that are 01:02:36.000 --> 01:02:39.000 not black boxes, and that are pure text - 01:02:39.000 --> 01:02:43.000 I can copy these things to my notes... 01:02:43.000 --> 01:02:44.000 and this one here goes to that 01:02:44.000 --> 01:02:47.000 description, this one here goes to the 01:02:47.000 --> 01:02:50.000 source code of require... 01:02:50.000 --> 01:02:55.000 this one here goes to the manual, 01:02:55.000 --> 01:03:00.000 and so on... 01:03:00.000 --> 01:03:02.000 so this is the configuration without 01:03:02.000 --> 01:03:06.000 magic. 01:03:06.000 --> 01:03:09.000 I promised that I was also going to 01:03:09.000 --> 01:03:12.000 show the configuration with just 01:03:12.000 --> 01:03:16.000 a bit of magic. 01:03:16.000 --> 01:03:21.000 If we type find-wconfig-links... 01:03:21.000 --> 01:03:25.000 here, if you run this 01:03:25.000 --> 01:03:28.000 it says that if we want to configure eev 01:03:28.000 --> 01:03:30.000 on windows with _some_ magic we can follow 01:03:30.000 --> 01:03:34.000 the instructions here... 01:03:34.000 --> 01:03:36.000 and here we have something very similar, 01:03:36.000 --> 01:03:40.000 but with fewer tests, 01:03:40.000 --> 01:03:45.000 and less documentation... 01:03:45.000 --> 01:03:49.000 and we just need to 01:03:49.000 --> 01:03:51.000 configure these things here, 01:03:51.000 --> 01:03:53.000 to follow the instructions here - that I'm 01:03:53.000 --> 01:03:55.000 not going to follow - and the thing is 01:03:55.000 --> 01:03:58.000 that after 01:03:58.000 --> 01:04:01.000 running all these things 01:04:01.000 --> 01:04:06.000 we can save our configuration as just this 01:04:06.000 --> 01:04:07.000 thing here 01:04:07.000 --> 01:04:09.000 so we can save this configuration 01:04:09.000 --> 01:04:14.000 in Emacs instead of this big thing above 01:04:14.000 --> 01:04:17.000 let me compare the version without 01:04:17.000 --> 01:04:19.000 magic to the version with very little 01:04:19.000 --> 01:04:21.000 magic. This is the result of running the 01:04:21.000 --> 01:04:24.000 configuration 01:04:24.000 --> 01:04:29.000 with no magic, and this is the result of 01:04:29.000 --> 01:04:30.000 running the configuration with very 01:04:30.000 --> 01:04:33.000 little magic 01:04:33.000 --> 01:04:36.000 and note that this configuration here it 01:04:36.000 --> 01:04:38.000 ends with this sexp here, that is a bit 01:04:38.000 --> 01:04:40.000 magic... 01:04:40.000 --> 01:04:43.000 if we want to understand what this 01:04:43.000 --> 01:04:46.000 magic thing does 01:04:46.000 --> 01:04:53.000 this sexp runs these three blocks 01:04:53.000 --> 01:04:56.000 here... so this is the expansion 01:04:56.000 --> 01:05:03.000 of whatthis sexp does. 01:05:03.000 --> 01:05:13.000 Ok, so if we look at our init file again 01:05:13.000 --> 01:05:17.000 this sexp here - (ee-wconfig-run-magic) - 01:05:17.000 --> 01:05:29.000 corresponds to all this stuff here. 01:05:29.000 --> 01:05:31.000 And now that we have everything 01:05:31.000 --> 01:05:33.000 configured 01:05:33.000 --> 01:05:35.000 we can 01:05:35.000 --> 01:05:36.000 run an exercise: 01:05:36.000 --> 01:05:40.000 we can learn Org! 01:05:40.000 --> 01:05:42.000 Let me make a pause on this 01:05:42.000 --> 01:05:45.000 video, and i'm going to record the part 4 01:05:45.000 --> 01:05:51.000 of the video in a few minutes. 01:05:51.000 --> 01:05:54.000 Hi! I'm back. 01:05:54.000 --> 01:05:57.000 In this part of the video I'm going to 01:05:57.000 --> 01:06:00.000 explain how to 01:06:00.000 --> 01:06:03.000 do the exercise, which is how to use eev 01:06:03.000 --> 01:06:06.000 to learn Org. 01:06:06.000 --> 01:06:09.000 Remember that here in the main 01:06:09.000 --> 01:06:13.000 wconfig buffer the last part says 01:06:13.000 --> 01:06:15.000 "Exercise: Learn Org!" and it has this 01:06:15.000 --> 01:06:16.000 expression here... 01:06:16.000 --> 01:06:19.000 if we execute this expression we get all 01:06:19.000 --> 01:06:23.000 the instructions - I mean 01:06:23.000 --> 01:06:24.000 what we're going to see now is the 01:06:24.000 --> 01:06:26.000 current version of 01:06:26.000 --> 01:06:28.000 these instructions - this is a work in 01:06:28.000 --> 01:06:30.000 progress, I'm probably going to 01:06:30.000 --> 01:06:34.000 rewrite some things... 01:06:34.000 --> 01:06:36.000 anyway, here we have 01:06:36.000 --> 01:06:38.000 some URLs... 01:06:38.000 --> 01:06:42.000 this is the page about eev-wconfig, 01:06:42.000 --> 01:06:44.000 and its last section 01:06:44.000 --> 01:06:48.000 is this one: "Exercise: Learn Org!" 01:06:48.000 --> 01:06:51.000 and it has some links here that I'm not 01:06:51.000 --> 01:06:53.000 going to open... the important thing is 01:06:53.000 --> 01:06:55.000 that 01:06:55.000 --> 01:06:58.000 this link goes to a README that explains 01:06:58.000 --> 01:07:01.000 what is the .zip file with the 01:07:01.000 --> 01:07:03.000 videos 01:07:03.000 --> 01:07:04.000 so 01:07:04.000 --> 01:07:09.000 here is the README of the playlist, 01:07:09.000 --> 01:07:11.000 and we can download the video from this 01:07:11.000 --> 01:07:13.000 link here. 01:07:13.000 --> 01:07:17.000 At this moment this link points to 01:07:17.000 --> 01:07:18.000 Google Drive, 01:07:18.000 --> 01:07:20.000 and the file is quite big - it's 01:07:20.000 --> 01:07:24.000 1.7 gigabytes - 01:07:24.000 --> 01:07:29.000 and if we click here 01:07:29.000 --> 01:07:31.000 Google Drive says that it can't open 01:07:31.000 --> 01:07:34.000 the file, but we can download it... 01:07:34.000 --> 01:07:38.000 so... 01:07:38.000 --> 01:07:40.000 well, you have to download the file, you 01:07:40.000 --> 01:07:42.000 have to unzip it somewhere, 01:07:42.000 --> 01:07:44.000 and then 01:07:44.000 --> 01:07:45.000 you have to follow these 01:07:45.000 --> 01:07:48.000 instructions here. 01:07:48.000 --> 01:07:50.000 The important thing of this exercise 01:07:50.000 --> 01:07:52.000 is that you need to learn how to create 01:07:52.000 --> 01:07:55.000 shorter hyperlinks. 01:07:55.000 --> 01:07:57.000 They are explained in this section of 01:07:57.000 --> 01:08:00.000 the main tutorial - remember that 01:08:00.000 --> 01:08:03.000 find-eev-quick-intro is the main tutorial - 01:08:03.000 --> 01:08:06.000 and I think that these video links are 01:08:06.000 --> 01:08:11.000 quite good, because they explain how 01:08:11.000 --> 01:08:13.000 this function creates several other 01:08:13.000 --> 01:08:15.000 functions... 01:08:15.000 --> 01:08:21.000 anyway, 01:08:21.000 --> 01:08:27.000 so: this link points to that section... 01:08:27.000 --> 01:08:30.000 you have to download the .zip you 01:08:30.000 --> 01:08:33.000 have to unpack it somewhere, and then you 01:08:33.000 --> 01:08:35.000 have to create a link to that directory... 01:08:35.000 --> 01:08:38.000 which means that you have to 01:08:38.000 --> 01:08:41.000 edit the directory here to 01:08:41.000 --> 01:08:44.000 the right directory 01:08:44.000 --> 01:08:47.000 and this is probably going to be very 01:08:47.000 --> 01:09:01.000 useful: Emacs has a mode called Dired... 01:09:01.000 --> 01:09:03.000 a mode for editing directories 01:09:03.000 --> 01:09:08.000 by treating them as text... 01:09:08.000 --> 01:09:11.000 so here we are in Dired mode, 01:09:11.000 --> 01:09:14.000 and we can navigate directories - 01:09:14.000 --> 01:09:16.000 for example here we open a 01:09:16.000 --> 01:09:20.000 subdirectory, if you click here we go 01:09:20.000 --> 01:09:26.000 back to where we were... 01:09:26.000 --> 01:09:30.000 this directory is empty. Anyway, you need 01:09:30.000 --> 01:09:33.000 to learn how to use this to navigate to 01:09:33.000 --> 01:09:34.000 the directory 01:09:34.000 --> 01:09:38.000 in which you unpacked the videos, 01:09:38.000 --> 01:09:40.000 and then the next part of the exercise 01:09:40.000 --> 01:09:47.000 is to learn how to use M-h M-e, 01:09:47.000 --> 01:09:50.000 which is find-extra-file-links, 01:09:50.000 --> 01:09:52.000 that is explained here, 01:09:52.000 --> 01:09:55.000 in this section of the tutorial... 01:09:55.000 --> 01:10:01.000 and then you need to to use M-h M-e 01:10:01.000 --> 01:10:04.000 to create links like these ones. 01:10:04.000 --> 01:10:07.000 Let me show how to do that using 01:10:07.000 --> 01:10:09.000 links that corresponds to the place in 01:10:09.000 --> 01:10:11.000 which I opened the 01:10:11.000 --> 01:10:18.000 the zip file in my machine. 01:10:18.000 --> 01:10:21.000 This is the directory... sorry - if I 01:10:21.000 --> 01:10:25.000 execute this the code-c-d it defines several 01:10:25.000 --> 01:10:27.000 functions, 01:10:27.000 --> 01:10:30.000 including the function 01:10:30.000 --> 01:10:35.000 find-rainerkoeniggrep... 01:10:35.000 --> 01:10:37.000 it also defines the function 01:10:37.000 --> 01:10:40.000 find-rainerkoenigfile and if we 01:10:40.000 --> 01:10:43.000 execute that function we go to this 01:10:43.000 --> 01:10:46.000 directory here 01:10:46.000 --> 01:10:50.000 which is the directory in which 01:10:50.000 --> 01:10:53.000 I unpacked the 01:10:53.000 --> 01:10:57.000 the zip file.. 01:10:57.000 --> 01:11:00.000 and if I type M-h M-e in 01:11:00.000 --> 01:11:03.000 that directory I get a temporary buffer 01:11:03.000 --> 01:11:04.000 like this one... 01:11:04.000 --> 01:11:06.000 i need to 01:11:06.000 --> 01:11:09.000 use a smaller font here because 01:11:09.000 --> 01:11:12.000 some lines are very long... 01:11:12.000 --> 01:11:17.000 here you have to type "rainerkoenig" 01:11:17.000 --> 01:11:20.000 and execute this line here... it will 01:11:20.000 --> 01:11:22.000 regenerate the buffer. 01:11:22.000 --> 01:11:25.000 So pay attention to the "c"s 01:11:25.000 --> 01:11:27.000 between curly brackets... 01:11:27.000 --> 01:11:32.000 they become "rainerkoenig" - 01:11:32.000 --> 01:11:35.000 and then you have to 01:11:35.000 --> 01:11:42.000 copy these things here to your notes - 01:11:42.000 --> 01:11:48.000 to here - 01:11:48.000 --> 01:11:51.000 and if we did everything correctly then 01:11:51.000 --> 01:11:54.000 we can execute this thing here... it will 01:11:54.000 --> 01:11:57.000 define the function 01:11:57.000 --> 01:11:59.000 find-rainerkoenigfile 01:11:59.000 --> 01:12:01.000 which will open this directory, as I did 01:12:01.000 --> 01:12:03.000 above... 01:12:03.000 --> 01:12:05.000 and now we can 01:12:05.000 --> 01:12:07.000 choose one of these videos here, for 01:12:07.000 --> 01:12:10.000 example, the first one... 01:12:10.000 --> 01:12:13.000 but we have to choose the video 01:12:13.000 --> 01:12:17.000 file, not the subtitle file. 01:12:17.000 --> 01:12:24.000 we have to type M-h M-e again 01:12:24.000 --> 01:12:26.000 and now we have to choose a short name 01:12:26.000 --> 01:12:28.000 for the video - I suggest 01:12:28.000 --> 01:12:32.000 either using this or using an 01:12:32.000 --> 01:12:34.000 abbreviation of the title... but let me 01:12:34.000 --> 01:12:38.000 choose this. 01:12:38.000 --> 01:12:40.000 Now I will 01:12:40.000 --> 01:12:42.000 run this first line again. It will 01:12:42.000 --> 01:12:45.000 regenerate this buffer, so the 01:12:45.000 --> 01:12:48.000 "c"s between curly braces will become 01:12:48.000 --> 01:12:51.000 this thing... 01:12:51.000 --> 01:12:54.000 and now this block here 01:12:54.000 --> 01:12:57.000 points to that video file. 01:12:57.000 --> 01:13:00.000 We can test that by executing 01:13:00.000 --> 01:13:03.000 this line - 01:13:03.000 --> 01:13:06.000 it opens the video - 01:13:06.000 --> 01:13:10.000 and if we execute this line here 01:13:10.000 --> 01:13:12.000 it defines the function 01:13:12.000 --> 01:13:17.000 find-E01S01video 01:13:17.000 --> 01:13:20.000 and we can execute this function 01:13:20.000 --> 01:13:23.000 find-E01S01video, 01:13:23.000 --> 01:13:25.000 and it will be a short hyperlink to this 01:13:25.000 --> 01:13:27.000 video. 01:13:27.000 --> 01:13:31.000 And after doing that we can copy 01:13:31.000 --> 01:13:33.000 the relevant lines 01:13:33.000 --> 01:13:36.000 to our notes 01:13:36.000 --> 01:13:38.000 the relevant lines are these ones - 01:13:38.000 --> 01:13:43.000 actually this one is not necessary - 01:13:43.000 --> 01:13:47.000 and now that we have this we have 01:13:47.000 --> 01:13:51.000 two functions, the sexps 01:13:51.000 --> 01:13:54.000 that define short hyperlinks... 01:13:54.000 --> 01:13:56.000 this one here define a hyperlink to the 01:13:56.000 --> 01:13:58.000 directory, and this one here defines 01:13:58.000 --> 01:14:01.000 a hyperlink to the video... 01:14:01.000 --> 01:14:03.000 and this is 01:14:03.000 --> 01:14:07.000 quite similar to these examples here but 01:14:07.000 --> 01:14:10.000 note that the examples have 01:14:10.000 --> 01:14:13.000 bad paths that people will have to fix 01:14:13.000 --> 01:14:17.000 somehow... 01:14:17.000 --> 01:14:19.000 and that's it. 01:14:19.000 --> 01:14:22.000 I don't know if this exercise is easy 01:14:22.000 --> 01:14:24.000 enough, I think that it's a bit hard, 01:14:24.000 --> 01:14:26.000 unfortunately... but if people can manage 01:14:26.000 --> 01:14:29.000 to do this they can use 01:14:29.000 --> 01:14:32.000 these things to 01:14:32.000 --> 01:14:34.000 create an index of the videos that they 01:14:34.000 --> 01:14:36.000 have watched... 01:14:36.000 --> 01:14:39.000 and note that we can duplicate 01:14:39.000 --> 01:14:41.000 this line and change 01:14:41.000 --> 01:14:46.000 the time mark here to, 5:00, say... 01:14:46.000 --> 01:14:50.000 oops, this video is shorter than that - 01:14:50.000 --> 01:14:53.000 2:00 - 01:14:53.000 --> 01:14:56.000 and we can use these things to 01:14:56.000 --> 01:15:01.000 create an index of the video 01:15:01.000 --> 01:15:06.000 with a short summary of what this 01:15:06.000 --> 01:15:08.000 position means here... sorry for my lack of 01:15:08.000 --> 01:15:10.000 imagination, but 01:15:10.000 --> 01:15:12.000 suppose that 01:15:12.000 --> 01:15:14.000 at the moment 2:00 of the video 01:15:14.000 --> 01:15:16.000 there's "blah" happening. 01:15:16.000 --> 01:15:22.000 so this sexp here opens the video at 2:00 01:15:22.000 --> 01:15:24.000 and we can use that to mark the 01:15:24.000 --> 01:15:26.000 positions of the video that we want to 01:15:26.000 --> 01:15:29.000 watch again - especially the parts of 01:15:29.000 --> 01:15:31.000 the video 01:15:31.000 --> 01:15:34.000 in which Rainer Koenig explains 01:15:34.000 --> 01:15:36.000 things that 01:15:36.000 --> 01:15:37.000 we 01:15:37.000 --> 01:15:38.000 will have to watch many times to 01:15:38.000 --> 01:15:41.000 understand and to memorize the key 01:15:41.000 --> 01:15:43.000 sequences. 01:15:43.000 --> 01:15:48.000 Uh, yeah, so that's it. =)