1 00:00:00,030 --> 00:00:05,339 okay bene benvenuti alla terza lezione 2 00:00:03,360 --> 00:00:07,500 del semestre mancante 3 00:00:05,339 --> 00:00:09,990 di CI oggi parleremo 4 00:00:07,500 --> 00:00:11,759 di text editors questo è uno 5 00:00:09,990 --> 00:00:13,259 argomento che mi piace molto e penso che sia 6 00:00:11,759 --> 00:00:14,940 uno dei argomenti più importanti che 7 00:00:13,259 --> 00:00:17,130 insegneremo in questa classe perché come 8 00:00:14,940 --> 00:00:19,619 programmatori spenderete molto del vostro tempo 9 00:00:17,130 --> 00:00:21,840 a modificare testi e programmi 10 00:00:19,619 --> 00:00:23,609 se investe tempo nel rendervi 11 00:00:21,840 --> 00:00:25,580 più efficienti nel farlo, risparmierete 12 00:00:23,609 --> 00:00:27,990 un sacco di tempo probabilmente centinaia di ore 13 00:00:25,580 --> 00:00:31,980 durante il corso della vostra laurea o 14 00:00:27,990 --> 00:00:33,510 durante la vostra cariera lavorativa, 15 00:00:31,980 --> 00:00:36,480 i text editors sono leggermente differenti da 16 00:00:33,510 --> 00:00:38,280 altri programmi che potresti usare per modificare ad esempio 17 00:00:36,480 --> 00:00:39,750 cose come la prosa Inglese perchè 18 00:00:38,280 --> 00:00:41,760 i programmare è differente dal scrivere 19 00:00:39,750 --> 00:00:44,160 una prosa Inglese, quando programmate 20 00:00:41,760 --> 00:00:45,600 spendete molto tempo nel leggere cosa 21 00:00:44,160 --> 00:00:47,579 avevate scritto, spendete molto tempo 22 00:00:45,600 --> 00:00:49,079 navigating around a buffer and you spend 23 00:00:47,579 --> 00:00:51,030 a lot of time making little edits to 24 00:00:49,079 --> 00:00:52,860 code all over the place rather than just 25 00:00:51,030 --> 00:00:53,789 writing in a long stream like you do 26 00:00:52,860 --> 00:00:55,289 when you're writing an essay or 27 00:00:53,789 --> 00:00:56,460 something and so it makes sense that 28 00:00:55,289 --> 00:00:57,899 there different programs for these 29 00:00:56,460 --> 00:00:59,309 different purposes right so yeah things 30 00:00:57,899 --> 00:01:01,440 like Microsoft Word for writing essays 31 00:00:59,309 --> 00:01:05,820 and things like vim and Emacs and vs 32 00:01:01,440 --> 00:01:07,409 code and sublime for writing code so the 33 00:01:05,820 --> 00:01:09,180 way you learn a text editor and become 34 00:01:07,409 --> 00:01:11,130 really good at it is you start with a 35 00:01:09,180 --> 00:01:12,840 tutorial and so that's basically going 36 00:01:11,130 --> 00:01:15,720 to be the function of today's lecture 37 00:01:12,840 --> 00:01:17,759 plus the exercises we've given you and 38 00:01:15,720 --> 00:01:19,950 then after the tutorial you need to 39 00:01:17,759 --> 00:01:22,020 stick with the editor for all your 40 00:01:19,950 --> 00:01:24,000 editing tasks and when you're learning a 41 00:01:22,020 --> 00:01:25,380 sophisticated tool so today we're going 42 00:01:24,000 --> 00:01:26,850 to teach you vim which is one powerful 43 00:01:25,380 --> 00:01:28,229 editor that a lot of programmers use 44 00:01:26,850 --> 00:01:30,240 when you're learning such a 45 00:01:28,229 --> 00:01:32,400 sophisticated tool it may be the case 46 00:01:30,240 --> 00:01:33,750 that initially switching to this tool 47 00:01:32,400 --> 00:01:35,850 slows you down a little bit when you're 48 00:01:33,750 --> 00:01:38,729 programming but stick with it because 49 00:01:35,850 --> 00:01:41,340 I'd say that in about 20 hours of 50 00:01:38,729 --> 00:01:42,990 programming using a new editor you'll be 51 00:01:41,340 --> 00:01:44,790 back to the same speed at which you 52 00:01:42,990 --> 00:01:46,350 programmed using your old tool and then 53 00:01:44,790 --> 00:01:47,759 after that the benefits will start and 54 00:01:46,350 --> 00:01:50,189 you'll get faster and faster as you 55 00:01:47,759 --> 00:01:53,579 learn more with these sophisticated 56 00:01:50,189 --> 00:01:55,079 programs like them it takes not way too 57 00:01:53,579 --> 00:01:58,200 long to learn the basics but a lifetime 58 00:01:55,079 --> 00:01:59,759 to master and so throughout the time 59 00:01:58,200 --> 00:02:01,649 you're using this tool make sure you 60 00:01:59,759 --> 00:02:03,240 look things up as you go if you ever get 61 00:02:01,649 --> 00:02:04,710 to a point where you're like oh this is 62 00:02:03,240 --> 00:02:06,420 a really inefficient way of doing things 63 00:02:04,710 --> 00:02:09,660 is there a better way the answer is 64 00:02:06,420 --> 00:02:11,730 almost always yes because these text 65 00:02:09,660 --> 00:02:13,709 editors were written by programmers for 66 00:02:11,730 --> 00:02:13,970 programmers and so of course like the 67 00:02:13,709 --> 00:02:15,200 peep 68 00:02:13,970 --> 00:02:17,330 I wrote these tolls ran into the same 69 00:02:15,200 --> 00:02:18,080 kinds of issues and fixed them so that 70 00:02:17,330 --> 00:02:19,760 you don't need to deal with these 71 00:02:18,080 --> 00:02:21,860 anymore and so yeah as you're learning 72 00:02:19,760 --> 00:02:23,870 make sure you look things up as you go 73 00:02:21,860 --> 00:02:25,370 either use Google or feel free to send 74 00:02:23,870 --> 00:02:27,320 us emails if you have questions or come 75 00:02:25,370 --> 00:02:29,590 to office hours and we'll help you 76 00:02:27,320 --> 00:02:32,300 figure out how to do things really fast 77 00:02:29,590 --> 00:02:34,130 so as far as which editor to learn in 78 00:02:32,300 --> 00:02:35,510 previous iterations of this class we 79 00:02:34,130 --> 00:02:36,890 actually avoided teaching a specific 80 00:02:35,510 --> 00:02:39,050 editor because we didn't want to enforce 81 00:02:36,890 --> 00:02:40,430 our opinions on you guys but we actually 82 00:02:39,050 --> 00:02:42,050 think that it's really useful to teach 83 00:02:40,430 --> 00:02:44,900 you how to use one particular tool and 84 00:02:42,050 --> 00:02:46,459 use it well and so people have really 85 00:02:44,900 --> 00:02:48,500 strong opinions about editor so you can 86 00:02:46,459 --> 00:02:52,040 see the course notes for more links on 87 00:02:48,500 --> 00:02:54,080 this topic looking at which editors have 88 00:02:52,040 --> 00:02:56,660 been popular over the years Stack 89 00:02:54,080 --> 00:02:59,090 Overflow I'm sure you've all heard of 90 00:02:56,660 --> 00:03:00,320 that does a survey every year asking 91 00:02:59,090 --> 00:03:02,000 developers various questions and one 92 00:03:00,320 --> 00:03:03,440 thing to ask is which TextEdit Derk do 93 00:03:02,000 --> 00:03:05,300 you use and it seems to be that 94 00:03:03,440 --> 00:03:07,730 currently the most popular kind of 95 00:03:05,300 --> 00:03:10,160 graphical editor is vs code and the most 96 00:03:07,730 --> 00:03:12,440 popular editor that is based within a 97 00:03:10,160 --> 00:03:13,910 command line interface is vim and so 98 00:03:12,440 --> 00:03:16,040 we're going to be teaching you vim and 99 00:03:13,910 --> 00:03:17,810 there a couple reasons for this one is 100 00:03:16,040 --> 00:03:19,970 that all the instructors so me John and 101 00:03:17,810 --> 00:03:21,320 Jose use vim as our primary editor and 102 00:03:19,970 --> 00:03:23,150 we've been doing this for many years and 103 00:03:21,320 --> 00:03:25,010 we've been very happy with it 104 00:03:23,150 --> 00:03:28,820 and we think that there are a lot of 105 00:03:25,010 --> 00:03:30,500 interesting ideas behind them so even if 106 00:03:28,820 --> 00:03:32,450 you don't end up using this particular 107 00:03:30,500 --> 00:03:35,540 tool in the long term I think it's 108 00:03:32,450 --> 00:03:37,280 valuable to learn these ideas and also a 109 00:03:35,540 --> 00:03:39,200 lot of tools have actually been really 110 00:03:37,280 --> 00:03:42,200 excited about the ideas in vim and so 111 00:03:39,200 --> 00:03:44,360 they support a vim emulation mode for 112 00:03:42,200 --> 00:03:45,820 example vs code what's apparently the 113 00:03:44,360 --> 00:03:48,170 most popular editor in use today 114 00:03:45,820 --> 00:03:50,660 supports vim bindings and this vim 115 00:03:48,170 --> 00:03:53,630 emulation mode as of now has like 1.4 116 00:03:50,660 --> 00:03:56,450 million downloads and as you'll see over 117 00:03:53,630 --> 00:03:57,830 the course of this lecture a lot of 118 00:03:56,450 --> 00:03:59,570 different tools like including your 119 00:03:57,830 --> 00:04:01,730 shell including things like the Python 120 00:03:59,570 --> 00:04:03,200 repple and like Jupiter notebook and all 121 00:04:01,730 --> 00:04:04,940 sorts of other things even your web 122 00:04:03,200 --> 00:04:06,890 browser can support of emulation mode 123 00:04:04,940 --> 00:04:10,400 and so yeah we're going to be teaching 124 00:04:06,890 --> 00:04:12,140 you this really neat tool today and in 125 00:04:10,400 --> 00:04:14,390 this lecture we can't really cover all 126 00:04:12,140 --> 00:04:17,030 of them right it's a very powerful tool 127 00:04:14,390 --> 00:04:18,769 but our goal is to teach you and the 128 00:04:17,030 --> 00:04:20,720 core philosophy of them like the really 129 00:04:18,769 --> 00:04:22,370 neat ideas behind it and then in 130 00:04:20,720 --> 00:04:23,750 addition to that some of the basics like 131 00:04:22,370 --> 00:04:25,490 how do you open a file close a file 132 00:04:23,750 --> 00:04:27,010 navigate around a file make edits and 133 00:04:25,490 --> 00:04:28,630 things like that and 134 00:04:27,010 --> 00:04:29,950 you may not remember every single little 135 00:04:28,630 --> 00:04:31,030 detail from this lecture because we're 136 00:04:29,950 --> 00:04:32,860 gonna go pretty fast through some of the 137 00:04:31,030 --> 00:04:34,510 material but it's all in the lecture 138 00:04:32,860 --> 00:04:36,640 notes and then the exercises actually 139 00:04:34,510 --> 00:04:37,900 give you links to some tutorials and 140 00:04:36,640 --> 00:04:40,030 things so I highly recommend that you 141 00:04:37,900 --> 00:04:43,840 actually go through all the exercises at 142 00:04:40,030 --> 00:04:49,450 least the non advanced exercises any 143 00:04:43,840 --> 00:04:51,250 questions so far great okay so one of 144 00:04:49,450 --> 00:04:54,160 the really cool ideas behind them is 145 00:04:51,250 --> 00:04:56,080 that vim is a modal editor what does 146 00:04:54,160 --> 00:04:58,450 this mean modal comes from the word mode 147 00:04:56,080 --> 00:05:00,970 and this means that vim has multiple 148 00:04:58,450 --> 00:05:02,920 operating modes and this is kind of 149 00:05:00,970 --> 00:05:04,570 developed from the idea that when you're 150 00:05:02,920 --> 00:05:05,950 programming there often times where 151 00:05:04,570 --> 00:05:07,420 you're doing different types of things 152 00:05:05,950 --> 00:05:09,220 like sometimes you're reading code 153 00:05:07,420 --> 00:05:10,960 sometimes you're making small edits to 154 00:05:09,220 --> 00:05:12,340 code like you're finding a particular 155 00:05:10,960 --> 00:05:15,040 point like changing a little thing 156 00:05:12,340 --> 00:05:16,540 somewhere sometimes you're just writing 157 00:05:15,040 --> 00:05:17,470 a lot of code in one go like suppose 158 00:05:16,540 --> 00:05:19,090 you're just writing a function from 159 00:05:17,470 --> 00:05:20,380 scratch and so there's different 160 00:05:19,090 --> 00:05:24,070 operating modes for doing these 161 00:05:20,380 --> 00:05:25,180 different types of things and so I'm 162 00:05:24,070 --> 00:05:26,470 actually want to write this down on the 163 00:05:25,180 --> 00:05:28,780 blackboard so I'll have a useful thing 164 00:05:26,470 --> 00:05:33,280 to refer to later so when you start vim 165 00:05:28,780 --> 00:05:35,260 up it starts up in what's called normal 166 00:05:33,280 --> 00:05:37,270 mode and in this mode all the different 167 00:05:35,260 --> 00:05:38,650 key combinations behave in one way and 168 00:05:37,270 --> 00:05:40,030 then there are different key 169 00:05:38,650 --> 00:05:42,400 combinations that switch you between 170 00:05:40,030 --> 00:05:45,880 normal mode and other modes which change 171 00:05:42,400 --> 00:05:47,950 the meaning of different keys so for the 172 00:05:45,880 --> 00:05:49,870 most part you'll be spending most of 173 00:05:47,950 --> 00:05:55,420 your time in vim in normal mode or what 174 00:05:49,870 --> 00:05:57,400 is called insert mode and to go to 175 00:05:55,420 --> 00:05:59,530 insert mode you press the key I for 176 00:05:57,400 --> 00:06:01,600 normal mode and to go from insert mode 177 00:05:59,530 --> 00:06:06,700 back to normal mode you press the Escape 178 00:06:01,600 --> 00:06:09,580 key a little note on notation because 179 00:06:06,700 --> 00:06:11,020 we'll need this later in the notation 180 00:06:09,580 --> 00:06:12,610 I'm going to be using in this lecture 181 00:06:11,020 --> 00:06:15,100 and what's also in the lecture notes and 182 00:06:12,610 --> 00:06:16,150 what vim uses to give you feedback they 183 00:06:15,100 --> 00:06:17,740 have a couple different ways of talking 184 00:06:16,150 --> 00:06:19,270 about different keys so when they're 185 00:06:17,740 --> 00:06:20,440 talking about bare keys like just the 186 00:06:19,270 --> 00:06:22,660 eye key on your keyboard they'll just 187 00:06:20,440 --> 00:06:24,310 say eye but for a different key 188 00:06:22,660 --> 00:06:27,130 combinations like when you press control 189 00:06:24,310 --> 00:06:29,920 and something like say control V it's 190 00:06:27,130 --> 00:06:32,350 notated in one of like approximately 191 00:06:29,920 --> 00:06:34,600 three ways one way that can be notated 192 00:06:32,350 --> 00:06:37,480 is a caret and then the control 193 00:06:34,600 --> 00:06:39,580 character so this is control V another 194 00:06:37,480 --> 00:06:40,660 way this might be written I think we've 195 00:06:39,580 --> 00:06:42,250 written it this way in 196 00:06:40,660 --> 00:06:43,150 lecture notes as control-v this is 197 00:06:42,250 --> 00:06:46,060 probably the one you're more used to 198 00:06:43,150 --> 00:06:48,880 seeing and then in some parts of them 199 00:06:46,060 --> 00:06:51,010 this is written as angle brackets C - V 200 00:06:48,880 --> 00:06:54,210 close angle bracket so just a little bit 201 00:06:51,010 --> 00:06:54,210 of notation that will be useful later 202 00:06:54,220 --> 00:06:59,350 so yeah vim has a couple different modes 203 00:06:56,950 --> 00:07:01,540 where normal mode is designed for 204 00:06:59,350 --> 00:07:03,520 navigating around a file reading things 205 00:07:01,540 --> 00:07:05,620 going from file to file things like that 206 00:07:03,520 --> 00:07:08,380 and then insert mode is where you type 207 00:07:05,620 --> 00:07:10,330 in text so most keys that you press here 208 00:07:08,380 --> 00:07:12,040 will just go into your text buffer where 209 00:07:10,330 --> 00:07:13,780 as keys that you press here are not 210 00:07:12,040 --> 00:07:15,190 being put into the buffer and instead 211 00:07:13,780 --> 00:07:20,380 are used for things like navigation or 212 00:07:15,190 --> 00:07:21,520 making edits and actually the picture is 213 00:07:20,380 --> 00:07:23,200 a little bit more complicated than this 214 00:07:21,520 --> 00:07:24,370 there are a whole bunch of other modes 215 00:07:23,200 --> 00:07:25,900 and I'm just gonna write them down here 216 00:07:24,370 --> 00:07:29,050 because we'll have them here to refer to 217 00:07:25,900 --> 00:07:33,100 later and so if it also has a replace 218 00:07:29,050 --> 00:07:34,030 mode for rather than inserting text and 219 00:07:33,100 --> 00:07:36,160 kind of pushing what's ahead of it 220 00:07:34,030 --> 00:07:37,810 forward it will overwrite text and then 221 00:07:36,160 --> 00:07:44,920 it has a bunch of different modes for 222 00:07:37,810 --> 00:07:48,040 selection so it has a mode called visual 223 00:07:44,920 --> 00:07:53,710 mode and then it has visual line and 224 00:07:48,040 --> 00:07:57,040 visual block this one is enter via the R 225 00:07:53,710 --> 00:08:01,810 key this was entered via the V key this 226 00:07:57,040 --> 00:08:05,680 one is entered via shift B and this one 227 00:08:01,810 --> 00:08:13,300 is entered via control V and then 228 00:08:05,680 --> 00:08:17,430 there's the command line mode which is 229 00:08:13,300 --> 00:08:17,430 entered via the colon key 230 00:08:19,180 --> 00:08:31,300 okay so now that we have that on the 231 00:08:21,070 --> 00:08:35,230 board to refer to later we can actually 232 00:08:31,300 --> 00:08:36,340 try some of this out all right so one 233 00:08:35,230 --> 00:08:38,560 thing we noticed looking at that picture 234 00:08:36,340 --> 00:08:40,390 is that to go from normal mode to any of 235 00:08:38,560 --> 00:08:41,800 the other modes we press some key but to 236 00:08:40,390 --> 00:08:43,330 go from any of the other modes back to 237 00:08:41,800 --> 00:08:45,190 normal mode where we spend a lot of our 238 00:08:43,330 --> 00:08:48,640 time we use the Escape key on our 239 00:08:45,190 --> 00:08:49,960 keyboard so for this reason since you 240 00:08:48,640 --> 00:08:51,970 under pressing the Escape key a lot when 241 00:08:49,960 --> 00:08:53,650 using vim a lot of programmers rebind 242 00:08:51,970 --> 00:08:55,180 one of the keys on their keyboard to be 243 00:08:53,650 --> 00:08:56,620 escape because it's really inconvenient 244 00:08:55,180 --> 00:08:58,060 to reach up with your left pinkie to 245 00:08:56,620 --> 00:08:59,920 press that tiny little Escape key in the 246 00:08:58,060 --> 00:09:01,870 corner of your keyboard and so a lot of 247 00:08:59,920 --> 00:09:04,540 people use the caps lock key instead so 248 00:09:01,870 --> 00:09:06,580 it's right there in the home row and we 249 00:09:04,540 --> 00:09:14,380 have some links in the lecture notes for 250 00:09:06,580 --> 00:09:15,730 how you can do this key rebinding okay 251 00:09:14,380 --> 00:09:17,500 so now that we've talked about kind of 252 00:09:15,730 --> 00:09:19,300 one of the core ideas of vim the idea of 253 00:09:17,500 --> 00:09:20,830 modal editing we can talk about some of 254 00:09:19,300 --> 00:09:23,080 the basics like how do you open up this 255 00:09:20,830 --> 00:09:25,870 text editor how do you open file save 256 00:09:23,080 --> 00:09:28,240 files and things like that and so this 257 00:09:25,870 --> 00:09:29,740 is a command line based program although 258 00:09:28,240 --> 00:09:31,900 there are some graphical variants and 259 00:09:29,740 --> 00:09:34,420 the way you start this program is by 260 00:09:31,900 --> 00:09:35,800 running vim one thing you might notice 261 00:09:34,420 --> 00:09:37,510 is that in the bottom left corner of my 262 00:09:35,800 --> 00:09:40,090 screen they actually saw what I just 263 00:09:37,510 --> 00:09:41,530 typed this will be useful later in this 264 00:09:40,090 --> 00:09:44,020 lecture where I'm actually typing in 265 00:09:41,530 --> 00:09:45,370 commands for vim and I'll be saying what 266 00:09:44,020 --> 00:09:47,890 I'm typing but you'll also see it on the 267 00:09:45,370 --> 00:09:50,380 screen so if I press ctrl C see it says 268 00:09:47,890 --> 00:09:55,510 ctrl C over there is that text big 269 00:09:50,380 --> 00:09:57,610 enough for everybody to read great okay 270 00:09:55,510 --> 00:09:59,800 so the way we open vim is just by 271 00:09:57,610 --> 00:10:02,470 running the program vim on our command 272 00:09:59,800 --> 00:10:03,790 line and this comes pre-installed on 273 00:10:02,470 --> 00:10:05,020 most systems and if you don't have it 274 00:10:03,790 --> 00:10:07,600 you can install it using your package 275 00:10:05,020 --> 00:10:08,560 manager vim can also take an argument if 276 00:10:07,600 --> 00:10:10,570 we want to use it to edit a particular 277 00:10:08,560 --> 00:10:12,850 file instead of just opening up the 278 00:10:10,570 --> 00:10:15,310 program then later opening a file so for 279 00:10:12,850 --> 00:10:17,140 example I have a file in this directory 280 00:10:15,310 --> 00:10:19,690 this is actually the lecture notes for 281 00:10:17,140 --> 00:10:21,940 this lecture so I can do vim editors MD 282 00:10:19,690 --> 00:10:25,690 and press ENTER and then boom them is 283 00:10:21,940 --> 00:10:29,820 started and then in this lecture I'm not 284 00:10:25,690 --> 00:10:32,860 running vim in the completely Exton I've 285 00:10:29,820 --> 00:10:34,930 configured a couple of things that 286 00:10:32,860 --> 00:10:36,940 behave a little bit nicer by defaults 287 00:10:34,930 --> 00:10:38,410 little things like having line numbers 288 00:10:36,940 --> 00:10:40,210 on the left or having some more status 289 00:10:38,410 --> 00:10:41,140 information on the bottom and if you 290 00:10:40,210 --> 00:10:42,850 want to start with this default 291 00:10:41,140 --> 00:10:43,930 configuration we have a link to this in 292 00:10:42,850 --> 00:10:49,270 the lecture notes so you can get a 293 00:10:43,930 --> 00:10:51,250 slightly more sane config by default so 294 00:10:49,270 --> 00:10:53,290 once you've opened them what do you do 295 00:10:51,250 --> 00:10:54,580 well as I said earlier vim starts in 296 00:10:53,290 --> 00:10:57,880 normal mode so if I just start typing 297 00:10:54,580 --> 00:10:59,650 letters like say type X it didn't insert 298 00:10:57,880 --> 00:11:01,660 X into the buffer you can see the cursor 299 00:10:59,650 --> 00:11:03,610 up in the top left it actually deleted 300 00:11:01,660 --> 00:11:07,300 one of the characters that's because I'm 301 00:11:03,610 --> 00:11:08,620 in normal mode not insert mode so insert 302 00:11:07,300 --> 00:11:09,850 mode is basically what you used to with 303 00:11:08,620 --> 00:11:10,900 all the other text editors you've used 304 00:11:09,850 --> 00:11:12,310 in the past where there's a cursor 305 00:11:10,900 --> 00:11:15,310 somewhere you press the character and it 306 00:11:12,310 --> 00:11:18,130 just goes into your buffer I'm instead 307 00:11:15,310 --> 00:11:19,900 in vim you start a normal mode and you 308 00:11:18,130 --> 00:11:21,610 can press I to go into insert mode so 309 00:11:19,900 --> 00:11:23,980 see I've pressed I and then in the 310 00:11:21,610 --> 00:11:26,500 bottom left notice that it says - - 311 00:11:23,980 --> 00:11:27,850 insert the bottom left always tells you 312 00:11:26,500 --> 00:11:29,650 what mode you're in unless this normal 313 00:11:27,850 --> 00:11:31,270 mode in which case it's blank and now 314 00:11:29,650 --> 00:11:33,250 that I'm an insert mode if I press the X 315 00:11:31,270 --> 00:11:35,740 character for example see it just gets 316 00:11:33,250 --> 00:11:37,450 inserted into my text buffer and I can 317 00:11:35,740 --> 00:11:39,580 backspace over at type other stuff and 318 00:11:37,450 --> 00:11:41,400 now my text editor kind of behaves like 319 00:11:39,580 --> 00:11:43,780 you'd expect any other program to behave 320 00:11:41,400 --> 00:11:45,520 so from this point how to go back to 321 00:11:43,780 --> 00:11:48,910 normal mode if I want to stop inserting 322 00:11:45,520 --> 00:11:51,670 characters yes exactly I press escape 323 00:11:48,910 --> 00:11:53,830 and that's the symbol my keystroke 324 00:11:51,670 --> 00:11:58,960 visuals I visualizer uses for escape so 325 00:11:53,830 --> 00:12:01,150 just be aware of that and then vim has 326 00:11:58,960 --> 00:12:02,890 this idea that using the mouse is 327 00:12:01,150 --> 00:12:04,570 inefficient like your hands are on the 328 00:12:02,890 --> 00:12:06,460 keyboard moving your hand over to the 329 00:12:04,570 --> 00:12:08,290 mouse takes a lot of time right like you 330 00:12:06,460 --> 00:12:09,610 don't want to waste those couple of 331 00:12:08,290 --> 00:12:11,410 milliseconds while you're programming 332 00:12:09,610 --> 00:12:13,990 like in the middle of things so instead 333 00:12:11,410 --> 00:12:15,700 all vim functionality can be accessed 334 00:12:13,990 --> 00:12:16,780 just through the keyboard and it's all 335 00:12:15,700 --> 00:12:19,330 sorts of things you might be used to 336 00:12:16,780 --> 00:12:21,460 doing like opening files by going like 337 00:12:19,330 --> 00:12:23,050 file open or file save or things like 338 00:12:21,460 --> 00:12:25,450 that or instead access through the 339 00:12:23,050 --> 00:12:27,520 keyboard and how is that done that's 340 00:12:25,450 --> 00:12:28,690 done through one of the other vim modes 341 00:12:27,520 --> 00:12:31,960 that are on the board over there in 342 00:12:28,690 --> 00:12:33,850 particular through command line mode so 343 00:12:31,960 --> 00:12:36,370 if you're in normal mode and you press 344 00:12:33,850 --> 00:12:39,370 the colon key you'll notice that the 345 00:12:36,370 --> 00:12:41,320 cursor I guess my visualizer is covering 346 00:12:39,370 --> 00:12:43,060 the thing right now but it's gone the 347 00:12:41,320 --> 00:12:46,110 cursor jumps to the bottom the bottom 348 00:12:43,060 --> 00:12:48,510 left and it shows that : I just typed 349 00:12:46,110 --> 00:12:50,220 now I can type in a command so you can 350 00:12:48,510 --> 00:12:51,570 think of this almost like the command 351 00:12:50,220 --> 00:12:53,160 shell that we've talked been talking 352 00:12:51,570 --> 00:12:54,029 about over the last few days except this 353 00:12:53,160 --> 00:12:55,800 is VIMS 354 00:12:54,029 --> 00:12:57,200 command shell so you give vim commands 355 00:12:55,800 --> 00:12:59,339 here instead of shell commands and 356 00:12:57,200 --> 00:13:00,600 they're a bunch of built-in commands 357 00:12:59,339 --> 00:13:02,820 that do all the things that you're used 358 00:13:00,600 --> 00:13:04,260 to like for example one command that you 359 00:13:02,820 --> 00:13:05,670 might want to know is how to quit this 360 00:13:04,260 --> 00:13:07,440 editor you might notice that if your 361 00:13:05,670 --> 00:13:08,730 normal mode I can press escape to go 362 00:13:07,440 --> 00:13:11,940 back from command line mode to normal 363 00:13:08,730 --> 00:13:13,560 mode and I press control C I'm like what 364 00:13:11,940 --> 00:13:16,019 happens the lot of programs this doesn't 365 00:13:13,560 --> 00:13:18,360 quit them so how do I quit vim I can 366 00:13:16,019 --> 00:13:19,860 press colon and then go into command 367 00:13:18,360 --> 00:13:23,430 line mode and then I can type in the 368 00:13:19,860 --> 00:13:24,870 command quit key uit you'll see that I 369 00:13:23,430 --> 00:13:28,560 maybe I should move this over to the 370 00:13:24,870 --> 00:13:31,350 middle or something ceases colon quit 371 00:13:28,560 --> 00:13:32,910 and I press ENTER and it quits bin I can 372 00:13:31,350 --> 00:13:35,490 open him up again there's actually a 373 00:13:32,910 --> 00:13:38,430 short form for this command just : Q and 374 00:13:35,490 --> 00:13:40,019 that'll do the same thing and there a 375 00:13:38,430 --> 00:13:42,839 bunch of other useful commands like this 376 00:13:40,019 --> 00:13:45,149 so some other handy wants to know are 377 00:13:42,839 --> 00:13:47,790 how do you save a file so suppose I make 378 00:13:45,149 --> 00:13:51,420 some edits here like hello world 379 00:13:47,790 --> 00:13:53,970 so I pressed I to go into insert mode or 380 00:13:51,420 --> 00:13:55,560 let me redo that I press I to go into 381 00:13:53,970 --> 00:14:02,010 insert mode right now I can use the down 382 00:13:55,560 --> 00:14:03,240 arrow to oh hey I think I've slightly I 383 00:14:02,010 --> 00:14:07,019 should fix that can you fix the config 384 00:14:03,240 --> 00:14:11,730 actually John never mind that 385 00:14:07,019 --> 00:14:14,820 okay so I suppose I go down to this line 386 00:14:11,730 --> 00:14:17,010 and I press I to go into insert mode and 387 00:14:14,820 --> 00:14:18,930 type in some text and then press escape 388 00:14:17,010 --> 00:14:20,610 to go back to normal mode now how do I 389 00:14:18,930 --> 00:14:22,680 actually save this file well there's 390 00:14:20,610 --> 00:14:25,550 another command for that so colon to go 391 00:14:22,680 --> 00:14:30,480 into command mode and then I can type W 392 00:14:25,550 --> 00:14:33,240 and press Enter w stands for write and 393 00:14:30,480 --> 00:14:35,699 it says in the bottom editors MD 394 00:14:33,240 --> 00:14:37,829 whatever blah blah written and so this 395 00:14:35,699 --> 00:14:40,320 means it saved the file and so now if I 396 00:14:37,829 --> 00:14:42,209 colon Q to quit and open the same file 397 00:14:40,320 --> 00:14:46,850 again you'll see that the changes have 398 00:14:42,209 --> 00:14:49,019 been persisted there are a couple other 399 00:14:46,850 --> 00:14:50,130 there's so there's a ton of different 400 00:14:49,019 --> 00:14:53,070 vim commands that are useful for 401 00:14:50,130 --> 00:14:56,100 different reasons but I'll just explain 402 00:14:53,070 --> 00:14:59,070 a couple more to you now one command 403 00:14:56,100 --> 00:15:01,500 that's really useful is help colon help 404 00:14:59,070 --> 00:15:04,080 and you can do : help and then type in a 405 00:15:01,500 --> 00:15:06,090 particular key or a particular command 406 00:15:04,080 --> 00:15:08,580 and get help for that keystroke or that 407 00:15:06,090 --> 00:15:10,950 command so if I want to know what : that 408 00:15:08,580 --> 00:15:15,420 was if I want to know what : w does I 409 00:15:10,950 --> 00:15:21,300 can do : help : W and that'll give me 410 00:15:15,420 --> 00:15:23,160 the documentation on : w or : right if I 411 00:15:21,300 --> 00:15:25,560 do : q it'll close this window and bring 412 00:15:23,160 --> 00:15:28,530 me back to where I was before 413 00:15:25,560 --> 00:15:35,340 and notice that : help : w is different 414 00:15:28,530 --> 00:15:38,190 from : help W because the W key is the W 415 00:15:35,340 --> 00:15:40,590 that like when you're normal mode and 416 00:15:38,190 --> 00:15:41,670 press W what happens is just the W key 417 00:15:40,590 --> 00:15:43,530 here without the : 418 00:15:41,670 --> 00:15:50,340 and if I look for help for : W that's 419 00:15:43,530 --> 00:15:56,040 the help for the W command so now you 420 00:15:50,340 --> 00:15:58,110 basically have the bare fundamentals 421 00:15:56,040 --> 00:16:00,720 needed to use them right you can open 422 00:15:58,110 --> 00:16:03,180 the editor use it to edit a particular 423 00:16:00,720 --> 00:16:05,010 file press I to go into insert mode and 424 00:16:03,180 --> 00:16:06,840 type in some text press escape to go 425 00:16:05,010 --> 00:16:09,630 back to normal mode and then : W to save 426 00:16:06,840 --> 00:16:11,460 your changes : W to quit so like already 427 00:16:09,630 --> 00:16:13,920 you have the bare fundamentals necessary 428 00:16:11,460 --> 00:16:17,210 to edit files using them albeit somewhat 429 00:16:13,920 --> 00:16:23,700 inefficiently so any questions so far 430 00:16:17,210 --> 00:16:25,470 yeah in the back yeah so the question is 431 00:16:23,700 --> 00:16:27,060 what's the benefit of the nura of the 432 00:16:25,470 --> 00:16:28,590 normal mode and we'll talk about that in 433 00:16:27,060 --> 00:16:31,560 more detail in like five minutes 434 00:16:28,590 --> 00:16:33,030 but in short insert mode is just for 435 00:16:31,560 --> 00:16:34,920 typing in text so I'm an insert mode I 436 00:16:33,030 --> 00:16:36,270 can type in text but when I'm 437 00:16:34,920 --> 00:16:39,000 programming I actually spend a lot of 438 00:16:36,270 --> 00:16:40,590 time moving around my file making small 439 00:16:39,000 --> 00:16:42,210 little changes so I go here and like oh 440 00:16:40,590 --> 00:16:45,390 maybe I want to change this HTTP link to 441 00:16:42,210 --> 00:16:48,120 an HD HTTP to HTTP 442 00:16:45,390 --> 00:16:49,920 I can make like small point edits things 443 00:16:48,120 --> 00:16:51,120 like that in normal mode and we'll see a 444 00:16:49,920 --> 00:16:52,920 whole lot more of that in about five 445 00:16:51,120 --> 00:16:59,130 minutes good question 446 00:16:52,920 --> 00:17:05,070 any other questions okay cool so moving 447 00:16:59,130 --> 00:17:11,100 along one other thing that's kind of 448 00:17:05,070 --> 00:17:12,720 useful to know I think is at a high 449 00:17:11,100 --> 00:17:15,479 level VIMS model 450 00:17:12,720 --> 00:17:16,470 buffers versus windows versus tabs so 451 00:17:15,479 --> 00:17:17,939 it's probably the case that whatever 452 00:17:16,470 --> 00:17:19,829 program you were using before like 453 00:17:17,939 --> 00:17:21,899 sublime text or vs code or whatever 454 00:17:19,829 --> 00:17:23,249 you could open multiple files in it 455 00:17:21,899 --> 00:17:24,899 right and you could probably have 456 00:17:23,249 --> 00:17:27,449 multiple tabs open and have multiple 457 00:17:24,899 --> 00:17:29,129 windows open of your editor so vim also 458 00:17:27,449 --> 00:17:31,200 has a notion of those different things 459 00:17:29,129 --> 00:17:34,379 but it's models a little bit different 460 00:17:31,200 --> 00:17:36,359 than most other programs so vim 461 00:17:34,379 --> 00:17:38,340 maintains a set of open buffers that's 462 00:17:36,359 --> 00:17:40,320 the word it uses for open files and so 463 00:17:38,340 --> 00:17:42,239 it has a set of open files and then kind 464 00:17:40,320 --> 00:17:44,489 of separately from that you can have a 465 00:17:42,239 --> 00:17:46,619 number of tabs and tabs can have windows 466 00:17:44,489 --> 00:17:47,460 the kind of weird thing which makes them 467 00:17:46,619 --> 00:17:48,899 a little bit different than the 468 00:17:47,460 --> 00:17:50,729 programming probably used in the past is 469 00:17:48,899 --> 00:17:52,049 that there isn't necessarily a 470 00:17:50,729 --> 00:17:55,200 one-to-one correspondence between 471 00:17:52,049 --> 00:17:56,669 buffers and windows so one thing I can 472 00:17:55,200 --> 00:17:58,259 do for example here and we'll show you 473 00:17:56,669 --> 00:18:00,989 the key combinations and stuff for this 474 00:17:58,259 --> 00:18:02,220 later but one thing you can do is create 475 00:18:00,989 --> 00:18:04,109 two different windows so I have one 476 00:18:02,220 --> 00:18:07,139 window up here and then one window down 477 00:18:04,109 --> 00:18:08,609 here and notice that the same files open 478 00:18:07,139 --> 00:18:10,529 in both windows so if I make some edits 479 00:18:08,609 --> 00:18:11,759 over here they actually happen in the 480 00:18:10,529 --> 00:18:13,729 bottom window as well because it's the 481 00:18:11,759 --> 00:18:16,590 same buffer that's open in both windows 482 00:18:13,729 --> 00:18:18,269 and this is kind of useful for say 483 00:18:16,590 --> 00:18:19,830 looking at two different parts of a 484 00:18:18,269 --> 00:18:20,940 single file at the same time like so you 485 00:18:19,830 --> 00:18:22,919 want to be able to look at the top of a 486 00:18:20,940 --> 00:18:25,049 file say at an import to your program 487 00:18:22,919 --> 00:18:27,809 while you're down below working 488 00:18:25,049 --> 00:18:29,129 somewhere else so this is one helpful 489 00:18:27,809 --> 00:18:32,999 thing to keep in mind that vim has this 490 00:18:29,129 --> 00:18:35,729 idea of they're a number of tabs and 491 00:18:32,999 --> 00:18:38,159 each tab has some number of Windows and 492 00:18:35,729 --> 00:18:40,649 then each window has a corresponds to 493 00:18:38,159 --> 00:18:42,269 some buffer but a particular buffer can 494 00:18:40,649 --> 00:18:44,399 be open in zero or more windows at a 495 00:18:42,269 --> 00:18:45,809 time just one thing that confused me 496 00:18:44,399 --> 00:18:48,049 when I was initially learning BIM so I 497 00:18:45,809 --> 00:18:50,669 want to explain that early on and then 498 00:18:48,049 --> 00:18:53,580 the : Q command which we talked about 499 00:18:50,669 --> 00:18:55,349 earlier is not exactly quit it's kind of 500 00:18:53,580 --> 00:18:56,729 closed the current window and then when 501 00:18:55,349 --> 00:18:59,460 they're no more open windows then we'll 502 00:18:56,729 --> 00:19:01,320 quit so here if I do : Q it'll only 503 00:18:59,460 --> 00:19:03,570 close the window I think on the top here 504 00:19:01,320 --> 00:19:05,609 because that's the one I was in and now 505 00:19:03,570 --> 00:19:08,159 the remaining window becomes fullscreen 506 00:19:05,609 --> 00:19:10,379 I can do : Q again to close this now in 507 00:19:08,159 --> 00:19:14,879 the second tab that I'd open if I do : Q 508 00:19:10,379 --> 00:19:16,229 a final time okay now vim exits and if 509 00:19:14,879 --> 00:19:17,940 you don't want to press : Q way too many 510 00:19:16,229 --> 00:19:21,419 times okay so here I have three split 511 00:19:17,940 --> 00:19:24,589 windows if I do : QA for quit all it 512 00:19:21,419 --> 00:19:24,589 closes all the open windows 513 00:19:25,370 --> 00:19:30,660 all right so now answer your question of 514 00:19:28,650 --> 00:19:32,610 what is normal mode actually for this is 515 00:19:30,660 --> 00:19:34,080 another really cool idea in them and I 516 00:19:32,610 --> 00:19:36,030 think this is actually like the most 517 00:19:34,080 --> 00:19:38,550 fundamentally interesting idea of this 518 00:19:36,030 --> 00:19:42,000 program it's that like you're all 519 00:19:38,550 --> 00:19:44,370 programmers you like programming vim has 520 00:19:42,000 --> 00:19:47,220 this idea that VIMS normal mode like 521 00:19:44,370 --> 00:19:49,740 VIMS interface itself is a programming 522 00:19:47,220 --> 00:19:51,060 language well and let me repeat that 523 00:19:49,740 --> 00:19:52,860 that's like a kind of fundamentally 524 00:19:51,060 --> 00:19:54,020 interesting idea the interface is a 525 00:19:52,860 --> 00:19:56,250 programming language 526 00:19:54,020 --> 00:19:57,570 what does that mean it means that 527 00:19:56,250 --> 00:19:59,280 different key combinations have 528 00:19:57,570 --> 00:20:00,150 different effects and once you learn the 529 00:19:59,280 --> 00:20:02,400 different effects you can actually 530 00:20:00,150 --> 00:20:03,390 combine them together just like in a 531 00:20:02,400 --> 00:20:04,770 programming language you can learn 532 00:20:03,390 --> 00:20:05,880 different functions and stuff and then 533 00:20:04,770 --> 00:20:08,070 glue them all together to make an 534 00:20:05,880 --> 00:20:09,870 interesting program in the same way once 535 00:20:08,070 --> 00:20:10,980 you learn them's different movement and 536 00:20:09,870 --> 00:20:13,890 editing commands and things like that 537 00:20:10,980 --> 00:20:16,950 you can talk to them by programming vim 538 00:20:13,890 --> 00:20:19,170 through its interface and once this 539 00:20:16,950 --> 00:20:20,880 becomes muscle memory you can basically 540 00:20:19,170 --> 00:20:22,440 edit files at the speed at which you 541 00:20:20,880 --> 00:20:23,640 think like at least for me I don't think 542 00:20:22,440 --> 00:20:25,320 I've been able to do this with any other 543 00:20:23,640 --> 00:20:29,010 text editor that I've used in the past 544 00:20:25,320 --> 00:20:31,380 but this one gets pretty close so let's 545 00:20:29,010 --> 00:20:34,170 dig into how exactly normal mode works 546 00:20:31,380 --> 00:20:36,140 so you can try to follow along with this 547 00:20:34,170 --> 00:20:38,400 like open up some random file in vim and 548 00:20:36,140 --> 00:20:40,470 follow some of the key combinations I 549 00:20:38,400 --> 00:20:42,330 type in so one basic thing that you 550 00:20:40,470 --> 00:20:44,010 might want to do is just navigate around 551 00:20:42,330 --> 00:20:46,020 a buffer like move your cursor up down 552 00:20:44,010 --> 00:20:48,510 left right and so the way you do that in 553 00:20:46,020 --> 00:20:50,700 vim is using the hjkl keys not the arrow 554 00:20:48,510 --> 00:20:52,050 keys though they do work by default try 555 00:20:50,700 --> 00:20:53,520 to avoid them because you don't want to 556 00:20:52,050 --> 00:20:54,660 have to move your hand all the way over 557 00:20:53,520 --> 00:20:57,240 to the arrow keys like there's a ton of 558 00:20:54,660 --> 00:21:00,510 time you're wasting right HT Cales right 559 00:20:57,240 --> 00:21:04,020 on the home row and so J moves down K 560 00:21:00,510 --> 00:21:06,390 moves up H moves left and L moves right 561 00:21:04,020 --> 00:21:08,940 and this may seem a little unintuitive 562 00:21:06,390 --> 00:21:10,410 now there was some historical reason for 563 00:21:08,940 --> 00:21:13,440 it like the keyboard the original VI 564 00:21:10,410 --> 00:21:14,910 developer used had the hjkl keys like 565 00:21:13,440 --> 00:21:17,040 labeled and arranged in a way that made 566 00:21:14,910 --> 00:21:19,260 this more reasonable but this will very 567 00:21:17,040 --> 00:21:20,370 soon become muscle memory so this is the 568 00:21:19,260 --> 00:21:24,270 basic way you can move your cursor 569 00:21:20,370 --> 00:21:26,070 around while in normal mode now what 570 00:21:24,270 --> 00:21:27,720 else can you do well if we had to move 571 00:21:26,070 --> 00:21:29,820 around files like this it'll be really 572 00:21:27,720 --> 00:21:31,590 slow we don't have to want to have to 573 00:21:29,820 --> 00:21:33,210 hold down these keys and like wait for a 574 00:21:31,590 --> 00:21:34,350 long time for them to do its thing and 575 00:21:33,210 --> 00:21:35,760 so there are all these other different 576 00:21:34,350 --> 00:21:36,650 key combinations for doing different 577 00:21:35,760 --> 00:21:38,120 movements 578 00:21:36,650 --> 00:21:39,200 also by the way this is all in the 579 00:21:38,120 --> 00:21:40,940 lecture notes so you don't need to 580 00:21:39,200 --> 00:21:43,550 memorize every single key and its 581 00:21:40,940 --> 00:21:45,320 meaning right now just try to understand 582 00:21:43,550 --> 00:21:47,570 the overall idea that bins interface is 583 00:21:45,320 --> 00:21:50,000 a programming language so another thing 584 00:21:47,570 --> 00:21:52,820 you can do is press the W key this moves 585 00:21:50,000 --> 00:21:54,620 the cursor forward by one word and then 586 00:21:52,820 --> 00:21:57,740 similarly the B key moves the cursor 587 00:21:54,620 --> 00:21:59,360 backward by one word so this allows 588 00:21:57,740 --> 00:22:01,820 slightly more efficient movement within 589 00:21:59,360 --> 00:22:04,010 the line there's also the e key for 590 00:22:01,820 --> 00:22:06,620 moving to the end of a word you're gonna 591 00:22:04,010 --> 00:22:08,030 move this over a little bit so if I'm 592 00:22:06,620 --> 00:22:09,800 here for example and I press the e key 593 00:22:08,030 --> 00:22:12,850 it'll go to the end of this word end of 594 00:22:09,800 --> 00:22:15,980 this word end of the next word and so on 595 00:22:12,850 --> 00:22:17,720 you can also move by whole lines so zero 596 00:22:15,980 --> 00:22:19,760 moves to the beginning of a line dollar 597 00:22:17,720 --> 00:22:22,640 sign moves to the end of a line and the 598 00:22:19,760 --> 00:22:25,790 caret key moves to the first non-empty 599 00:22:22,640 --> 00:22:31,730 character on a line so let me find one 600 00:22:25,790 --> 00:22:33,590 of those for example so here I'm on my 601 00:22:31,730 --> 00:22:34,760 cursors right here if I press 0 my 602 00:22:33,590 --> 00:22:37,040 cursor goes to the beginning of the line 603 00:22:34,760 --> 00:22:39,590 dollar sign end of the current line and 604 00:22:37,040 --> 00:22:41,270 if I press caret we're like on what 605 00:22:39,590 --> 00:22:44,840 character will the curser end up can 606 00:22:41,270 --> 00:22:47,870 anybody guess so caret goes to the first 607 00:22:44,840 --> 00:22:53,000 non-empty character on a line kind of 608 00:22:47,870 --> 00:22:57,200 like reg X carrot yeah exactly it goes 609 00:22:53,000 --> 00:22:59,780 to this - let's talk about some more 610 00:22:57,200 --> 00:23:01,220 movement commands there's a ways to 611 00:22:59,780 --> 00:23:06,230 scroll up and down in a buffer so 612 00:23:01,220 --> 00:23:08,510 control U goes up and control D scroll 613 00:23:06,230 --> 00:23:10,850 down so this is better than holding down 614 00:23:08,510 --> 00:23:13,190 the K or J keys for example this is a 615 00:23:10,850 --> 00:23:17,720 lot slower than moving by entire pages 616 00:23:13,190 --> 00:23:19,970 control D and control you there's also 617 00:23:17,720 --> 00:23:22,400 ways to move by the entire buffer so 618 00:23:19,970 --> 00:23:26,420 capital G moves all the way down G G 619 00:23:22,400 --> 00:23:28,490 moves all the way up some of these 620 00:23:26,420 --> 00:23:29,600 movement keys are mnemonics so they're 621 00:23:28,490 --> 00:23:31,400 like a little bit easier to remember for 622 00:23:29,600 --> 00:23:33,440 that reason right like double use word B 623 00:23:31,400 --> 00:23:36,230 as beginning for it is end of word those 624 00:23:33,440 --> 00:23:38,030 all seem pretty logical 0 caret and 625 00:23:36,230 --> 00:23:39,559 dollar kind of inspired from reg X so 626 00:23:38,030 --> 00:23:41,120 those make a little bit of sense there's 627 00:23:39,559 --> 00:23:42,890 some other ones that like don't 628 00:23:41,120 --> 00:23:43,940 necessarily make way too much sense but 629 00:23:42,890 --> 00:23:46,310 there are only so many keys on your 630 00:23:43,940 --> 00:23:48,590 keyboard so what are you going to do for 631 00:23:46,310 --> 00:23:49,430 example the L key moves your cursor to 632 00:23:48,590 --> 00:23:51,890 the lowest 633 00:23:49,430 --> 00:23:54,920 line that's shown on the screen l4 634 00:23:51,890 --> 00:24:01,430 lowest makes sense m4 middle and then h4 635 00:23:54,920 --> 00:24:02,660 highest I guess no and there's a whole 636 00:24:01,430 --> 00:24:04,250 bunch of other interesting movements 637 00:24:02,660 --> 00:24:05,330 like this so we're obviously not going 638 00:24:04,250 --> 00:24:07,070 to be able to cover all of them right 639 00:24:05,330 --> 00:24:08,690 now but you'll be able to go through 640 00:24:07,070 --> 00:24:11,320 them in the vim tutor exercise which is 641 00:24:08,690 --> 00:24:15,790 exercise number one for this lecture 642 00:24:11,320 --> 00:24:18,080 some other ones I want to talk about now 643 00:24:15,790 --> 00:24:19,640 maybe I'll talk about one more there's 644 00:24:18,080 --> 00:24:21,440 another movement called find this is 645 00:24:19,640 --> 00:24:23,210 also kind of useful suppose I'm on this 646 00:24:21,440 --> 00:24:25,340 line and I want to jump to the first 647 00:24:23,210 --> 00:24:27,260 character that equal to something like I 648 00:24:25,340 --> 00:24:31,310 want to jump to the first oh I can press 649 00:24:27,260 --> 00:24:33,860 F oh and my cursor moves to the first 650 00:24:31,310 --> 00:24:35,210 oh I've like found oh I can do FW and 651 00:24:33,860 --> 00:24:39,560 it'll move to the first W which I think 652 00:24:35,210 --> 00:24:40,880 is right here F C find the first C I can 653 00:24:39,560 --> 00:24:44,510 also do the same thing but backwards if 654 00:24:40,880 --> 00:24:47,930 I do capital F W I can find the W that's 655 00:24:44,510 --> 00:24:49,760 before it a capital FS find the s that's 656 00:24:47,930 --> 00:24:53,450 before that and then there's a variant 657 00:24:49,760 --> 00:24:56,690 of F for find T for two so I can jump to 658 00:24:53,450 --> 00:24:58,520 O and it jumps like until it's found oh 659 00:24:56,690 --> 00:25:03,110 but not on top of it right before it and 660 00:24:58,520 --> 00:25:04,820 capital T say T jumps backwards to the T 661 00:25:03,110 --> 00:25:07,190 except not all the way on top of it one 662 00:25:04,820 --> 00:25:09,770 character before and so you can already 663 00:25:07,190 --> 00:25:10,970 see that idea I talked about of like vim 664 00:25:09,770 --> 00:25:13,160 is a programming language you can really 665 00:25:10,970 --> 00:25:15,050 compose these commands F and T are 666 00:25:13,160 --> 00:25:16,790 finding two and you can say find a 667 00:25:15,050 --> 00:25:20,180 particular character or jump to a 668 00:25:16,790 --> 00:25:22,400 particular character so those are a 669 00:25:20,180 --> 00:25:26,660 couple of them movement commands so any 670 00:25:22,400 --> 00:25:32,050 questions about those so far so this is 671 00:25:26,660 --> 00:25:33,980 yeah question right yeah okay cool so 672 00:25:32,050 --> 00:25:35,540 those are have been movement commands 673 00:25:33,980 --> 00:25:37,880 this is how you can navigate around a 674 00:25:35,540 --> 00:25:40,070 file quickly in normal mode now another 675 00:25:37,880 --> 00:25:42,770 category of useful commands are editing 676 00:25:40,070 --> 00:25:44,480 commands so one we kind of already 677 00:25:42,770 --> 00:25:46,520 talked about which is the eye command 678 00:25:44,480 --> 00:25:48,500 for moving from normal mode to insert 679 00:25:46,520 --> 00:25:50,690 mode where you can start just writing 680 00:25:48,500 --> 00:25:52,490 text so suppose I go up here and I press 681 00:25:50,690 --> 00:25:57,020 I now I can type in whatever text I want 682 00:25:52,490 --> 00:25:58,370 hello world enter this back then press 683 00:25:57,020 --> 00:26:00,890 escape to go back to normal mode and 684 00:25:58,370 --> 00:26:01,640 I've made a change to my buffer but 685 00:26:00,890 --> 00:26:03,740 there are a whole bunch of other 686 00:26:01,640 --> 00:26:05,540 commands for making efficient 687 00:26:03,740 --> 00:26:07,760 that makes sense for when you're dealing 688 00:26:05,540 --> 00:26:09,410 with programming languages so one useful 689 00:26:07,760 --> 00:26:10,670 command that I accidentally used earlier 690 00:26:09,410 --> 00:26:13,280 before teaching you about it is the O 691 00:26:10,670 --> 00:26:16,130 command so suppose my cursor is like 692 00:26:13,280 --> 00:26:18,410 over here and if i press o from normal 693 00:26:16,130 --> 00:26:19,490 mode what it does is it opens a new line 694 00:26:18,410 --> 00:26:22,040 below where my cursor is 695 00:26:19,490 --> 00:26:23,420 that's what o stands for and it so it 696 00:26:22,040 --> 00:26:24,980 creates a new line and put me into 697 00:26:23,420 --> 00:26:27,290 insert modes and I can start typing in 698 00:26:24,980 --> 00:26:29,600 some text press escape and go back to 699 00:26:27,290 --> 00:26:32,240 normal mode and then just like the O 700 00:26:29,600 --> 00:26:35,540 command there's a capital o command so 701 00:26:32,240 --> 00:26:37,850 if I'm here and I do capital o it puts 702 00:26:35,540 --> 00:26:41,690 me into insert mode above where I 703 00:26:37,850 --> 00:26:44,240 currently am there's another vim command 704 00:26:41,690 --> 00:26:47,690 for deleting things so suppose my cursor 705 00:26:44,240 --> 00:26:51,560 is like on top of this word right here 706 00:26:47,690 --> 00:26:54,350 and I press the D key D for delete oh 707 00:26:51,560 --> 00:26:55,970 nothing happens turns out that the D key 708 00:26:54,350 --> 00:26:57,860 needs to be combined with a movement 709 00:26:55,970 --> 00:26:59,630 command so remember we just talked about 710 00:26:57,860 --> 00:27:02,870 different movement commands like hjkl 711 00:26:59,630 --> 00:27:03,530 and like word and backward word and 712 00:27:02,870 --> 00:27:07,670 things like that 713 00:27:03,530 --> 00:27:11,600 so I press D whoops I press D and I can 714 00:27:07,670 --> 00:27:13,970 press W and it's deleted a word so let 715 00:27:11,600 --> 00:27:16,820 me undo that undoing vim is just you for 716 00:27:13,970 --> 00:27:19,940 undo so notice my cursors right here I 717 00:27:16,820 --> 00:27:21,770 do DW it's deleted a word I can move 718 00:27:19,940 --> 00:27:25,100 around and then delete another word 719 00:27:21,770 --> 00:27:27,620 suppose I'm keeps getting in the way 720 00:27:25,100 --> 00:27:29,420 suppose I'm like somewhere in the middle 721 00:27:27,620 --> 00:27:31,130 of a word and I want to delete the end 722 00:27:29,420 --> 00:27:35,630 of a word any guesses for what 723 00:27:31,130 --> 00:27:39,320 combination of keys I'd use for that D 724 00:27:35,630 --> 00:27:43,790 and what de exactly delete the end of 725 00:27:39,320 --> 00:27:46,790 the word another useful editing command 726 00:27:43,790 --> 00:27:48,800 is the C command C stands for change so 727 00:27:46,790 --> 00:27:50,840 change is really similar to delete 728 00:27:48,800 --> 00:27:52,220 except change puts you in insert mode 729 00:27:50,840 --> 00:27:54,500 because like I want to delete a thing 730 00:27:52,220 --> 00:27:56,960 but change it to something else so if 731 00:27:54,500 --> 00:27:59,810 I'm here and I do see e it's like change 732 00:27:56,960 --> 00:28:00,950 to the end of the word and it gets rid 733 00:27:59,810 --> 00:28:02,630 of the contents until the end of the 734 00:28:00,950 --> 00:28:04,460 word and notice it put me in insert mode 735 00:28:02,630 --> 00:28:06,740 so now whatever characters I type go 736 00:28:04,460 --> 00:28:11,270 into the buffer if I press escape I go 737 00:28:06,740 --> 00:28:13,250 back into normal mode and so C and D are 738 00:28:11,270 --> 00:28:15,650 analogs they both take motions as 739 00:28:13,250 --> 00:28:17,290 arguments and they will either delete 740 00:28:15,650 --> 00:28:20,950 that motion or change 741 00:28:17,290 --> 00:28:24,370 that motion so for example if you press 742 00:28:20,950 --> 00:28:25,990 the seek there's also this pattern that 743 00:28:24,370 --> 00:28:27,880 if you press a particular editing key 744 00:28:25,990 --> 00:28:30,400 twice it'll have that effect on the 745 00:28:27,880 --> 00:28:32,980 given line so if I press D D that 746 00:28:30,400 --> 00:28:34,360 deletes the line if I press C C that 747 00:28:32,980 --> 00:28:35,560 deletes the given line but puts me in 748 00:28:34,360 --> 00:28:39,760 insert mode so I can replace it with 749 00:28:35,560 --> 00:28:43,360 some other line well cover a couple 750 00:28:39,760 --> 00:28:44,290 other editing commands because then 751 00:28:43,360 --> 00:28:46,720 later we'll see how all these things 752 00:28:44,290 --> 00:28:48,700 interact together so another useful one 753 00:28:46,720 --> 00:28:50,290 is the X command so suppose my cursor is 754 00:28:48,700 --> 00:28:52,120 over some particular character you've 755 00:28:50,290 --> 00:28:57,880 had pressed X it just deletes that 756 00:28:52,120 --> 00:29:00,310 character there's another command called 757 00:28:57,880 --> 00:29:02,260 R if I'm over a particular character and 758 00:29:00,310 --> 00:29:03,940 I press R it takes another character as 759 00:29:02,260 --> 00:29:05,440 an argument and it replaces that 760 00:29:03,940 --> 00:29:12,550 particular character with some other 761 00:29:05,440 --> 00:29:14,110 character and I'll cover a couple more 762 00:29:12,550 --> 00:29:16,390 editing commands so I think when I 763 00:29:14,110 --> 00:29:17,980 talked about a moment ago but of course 764 00:29:16,390 --> 00:29:19,360 you can undo changes you've made in vim 765 00:29:17,980 --> 00:29:21,520 and the way you do that is by pressing 766 00:29:19,360 --> 00:29:23,230 you while your normal mode so you for 767 00:29:21,520 --> 00:29:24,850 undo is pretty easy to remember so I 768 00:29:23,230 --> 00:29:26,310 press you a whole bunch of times it's 769 00:29:24,850 --> 00:29:28,750 undone all the changes I've made and 770 00:29:26,310 --> 00:29:31,000 then the opposite of undos of course 771 00:29:28,750 --> 00:29:40,960 redo and the binding for that in vim is 772 00:29:31,000 --> 00:29:42,310 control are all right one other editing 773 00:29:40,960 --> 00:29:55,090 command I'm going to talk about is copy 774 00:29:42,310 --> 00:29:56,290 and paste because oh yes question that's 775 00:29:55,090 --> 00:29:58,150 it that's a great question so the 776 00:29:56,290 --> 00:29:59,500 question is does undo undo everything 777 00:29:58,150 --> 00:30:00,970 you've done since you've gone into 778 00:29:59,500 --> 00:30:02,380 insert mode or just the last character 779 00:30:00,970 --> 00:30:03,280 it's it's actually a little bit more 780 00:30:02,380 --> 00:30:05,860 complicated than that 781 00:30:03,280 --> 00:30:07,540 undo does like undoes the last change 782 00:30:05,860 --> 00:30:08,800 you've made so if you went into insert 783 00:30:07,540 --> 00:30:10,480 mode and typed in some stuff and went 784 00:30:08,800 --> 00:30:12,520 back into normal mode and then press you 785 00:30:10,480 --> 00:30:14,560 for undo it'll undo all you've done in 786 00:30:12,520 --> 00:30:16,090 insert mode but if you've done some 787 00:30:14,560 --> 00:30:18,280 other type of editing command like say I 788 00:30:16,090 --> 00:30:20,140 press X to delete a character if I do 789 00:30:18,280 --> 00:30:24,280 you for undo it'll just undo that change 790 00:30:20,140 --> 00:30:26,440 that that editing command made now does 791 00:30:24,280 --> 00:30:28,780 that answer the question yeah great any 792 00:30:26,440 --> 00:30:32,780 other questions 793 00:30:28,780 --> 00:30:35,480 cool so I'll talk about copy and paste 794 00:30:32,780 --> 00:30:37,580 as well because that's a popular one the 795 00:30:35,480 --> 00:30:39,710 Y command stands for copying and the P 796 00:30:37,580 --> 00:30:41,810 command stands for pasting y for coffee 797 00:30:39,710 --> 00:30:43,370 because yank like that's the word date 798 00:30:41,810 --> 00:30:46,310 that's the term logic terminology that 799 00:30:43,370 --> 00:30:49,220 vim uses for copying and these commands 800 00:30:46,310 --> 00:30:52,580 are y also takes a motion as an argument 801 00:30:49,220 --> 00:30:54,350 so if I do like YY it copies the current 802 00:30:52,580 --> 00:30:56,090 line in an effect press P for paste 803 00:30:54,350 --> 00:30:57,260 notice that now these two lines are 804 00:30:56,090 --> 00:31:00,110 identical because I've just pasted a 805 00:30:57,260 --> 00:31:02,330 line below you for undo but if I do 806 00:31:00,110 --> 00:31:04,910 something like YW it's copied the word 807 00:31:02,330 --> 00:31:05,450 and then I can do P and it just pasted 808 00:31:04,910 --> 00:31:08,930 that word again 809 00:31:05,450 --> 00:31:10,700 right where my cursor was one useful 810 00:31:08,930 --> 00:31:12,530 thing especially in the context of copy 811 00:31:10,700 --> 00:31:14,150 and paste is to be able to select a 812 00:31:12,530 --> 00:31:15,650 block of stuff and copy it right like 813 00:31:14,150 --> 00:31:16,940 this is probably how to used copy and 814 00:31:15,650 --> 00:31:19,220 paste in whatever editor you were using 815 00:31:16,940 --> 00:31:21,440 before and so that's where we get into 816 00:31:19,220 --> 00:31:23,210 the visual modes so these are another 817 00:31:21,440 --> 00:31:24,590 set of modes that are all related to 818 00:31:23,210 --> 00:31:26,030 each other and that can be reached from 819 00:31:24,590 --> 00:31:28,790 normal mode and they're used for 820 00:31:26,030 --> 00:31:31,040 selecting chunks of text so one mode is 821 00:31:28,790 --> 00:31:33,140 just regular visual mode you can enter 822 00:31:31,040 --> 00:31:34,820 that by pressing V and then once you're 823 00:31:33,140 --> 00:31:36,650 in this mode you can use most of the 824 00:31:34,820 --> 00:31:38,450 regular normal mode commands to move 825 00:31:36,650 --> 00:31:39,980 your point around and it selects 826 00:31:38,450 --> 00:31:42,050 everything in between so I can use like 827 00:31:39,980 --> 00:31:44,030 hjkl just to move the cursor or I can 828 00:31:42,050 --> 00:31:45,890 use W to move by words or different 829 00:31:44,030 --> 00:31:48,080 things like that and it will select a 830 00:31:45,890 --> 00:31:49,490 block of text and once I've selected 831 00:31:48,080 --> 00:31:50,900 this block of text there a whole bunch 832 00:31:49,490 --> 00:31:52,610 of different types of useful things you 833 00:31:50,900 --> 00:31:54,770 could do with it one of the most popular 834 00:31:52,610 --> 00:31:57,320 things to do is copying this so once 835 00:31:54,770 --> 00:31:59,630 I've selected I can do Y to copy and it 836 00:31:57,320 --> 00:32:01,280 puts me back into normal mode and now 837 00:31:59,630 --> 00:32:02,810 it's copied this to the to the paste 838 00:32:01,280 --> 00:32:04,850 buffer and then if I go somewhere else 839 00:32:02,810 --> 00:32:07,670 and press P it pastes in that whole 840 00:32:04,850 --> 00:32:10,520 chunk of text I copied and it's similar 841 00:32:07,670 --> 00:32:13,610 to visual mode which selects kind of a 842 00:32:10,520 --> 00:32:15,560 contiguous stream of text there's visual 843 00:32:13,610 --> 00:32:17,720 line mode so that can be reached by 844 00:32:15,560 --> 00:32:19,760 pressing capital V and that selects 845 00:32:17,720 --> 00:32:21,470 whole lines at a time and then there's 846 00:32:19,760 --> 00:32:23,150 visual block mode which can be selected 847 00:32:21,470 --> 00:32:24,890 by pressing control V and that can 848 00:32:23,150 --> 00:32:26,240 select rectangular blocks of text so 849 00:32:24,890 --> 00:32:31,670 this is something your old editor 850 00:32:26,240 --> 00:32:33,320 couldn't do alright so there's a lot 851 00:32:31,670 --> 00:32:35,120 more vim editing commands to learn 852 00:32:33,320 --> 00:32:36,710 there's lots of like really weird and 853 00:32:35,120 --> 00:32:38,420 fancy things like for example the tilde 854 00:32:36,710 --> 00:32:40,220 command changes the case of the 855 00:32:38,420 --> 00:32:41,690 character or the selection that you've 856 00:32:40,220 --> 00:32:43,640 currently selected so for 857 00:32:41,690 --> 00:32:45,620 I can take this like Visual Studio code 858 00:32:43,640 --> 00:32:48,260 and flick the case on the whole thing by 859 00:32:45,620 --> 00:32:49,430 selecting it and pressing tilde and 860 00:32:48,260 --> 00:32:50,480 there's a whole bunch of other things 861 00:32:49,430 --> 00:32:52,160 like that they get more and more 862 00:32:50,480 --> 00:32:54,050 esoteric as you go so we're not going to 863 00:32:52,160 --> 00:32:56,630 cover all of those but you'll get to 864 00:32:54,050 --> 00:32:58,490 those in the exercises so those are vim 865 00:32:56,630 --> 00:33:00,620 editing commands and a lot of them can 866 00:32:58,490 --> 00:33:02,120 be composed with movement commands so 867 00:33:00,620 --> 00:33:09,260 any questions about either of those so 868 00:33:02,120 --> 00:33:12,680 far cool so moving along another 869 00:33:09,260 --> 00:33:14,240 category of things of commands that are 870 00:33:12,680 --> 00:33:16,880 mostly relevant to normal mode are 871 00:33:14,240 --> 00:33:18,530 counts so you can give them a number to 872 00:33:16,880 --> 00:33:22,100 do a particular thing some number of 873 00:33:18,530 --> 00:33:25,430 times so suppose my cursor is here and I 874 00:33:22,100 --> 00:33:26,960 want to move down like 1 2 3 4 lines one 875 00:33:25,430 --> 00:33:29,390 way I can do that is by pressing J four 876 00:33:26,960 --> 00:33:32,570 times go down four times KK KK it goes 877 00:33:29,390 --> 00:33:34,010 up four times but rather than pressing a 878 00:33:32,570 --> 00:33:37,430 particular key again and again I can use 879 00:33:34,010 --> 00:33:38,960 a count so if I press four J it does J 880 00:33:37,430 --> 00:33:40,130 four times right 881 00:33:38,960 --> 00:33:42,290 thumbs interface is a programming 882 00:33:40,130 --> 00:33:45,890 language if I do four K it moves up four 883 00:33:42,290 --> 00:33:47,600 times if I am here and I press me to go 884 00:33:45,890 --> 00:33:49,040 into visual mode okay so now I can move 885 00:33:47,600 --> 00:33:51,680 my cursor around and select blocks of 886 00:33:49,040 --> 00:33:53,660 text I can do like EEE to select a 887 00:33:51,680 --> 00:33:56,600 couple of words but I could also go back 888 00:33:53,660 --> 00:33:59,720 here v for visual mode and press three E 889 00:33:56,600 --> 00:34:03,080 to select like three ends of words for 890 00:33:59,720 --> 00:34:05,060 word and then of course these can also 891 00:34:03,080 --> 00:34:08,000 be combined with editing commands so 892 00:34:05,060 --> 00:34:10,910 like suppose I want to delete seven 893 00:34:08,000 --> 00:34:13,970 words I can do that by moving my cursor 894 00:34:10,910 --> 00:34:17,660 somewhere and doing seven dw7 delete 895 00:34:13,970 --> 00:34:19,490 words and so this is particularly useful 896 00:34:17,660 --> 00:34:21,260 for things like suppose my cursor 897 00:34:19,490 --> 00:34:22,460 somewhere on the screen and I'm looking 898 00:34:21,260 --> 00:34:24,020 somewhere else on the screen or I want 899 00:34:22,460 --> 00:34:26,240 my cursor to go to that particular line 900 00:34:24,020 --> 00:34:28,400 notice that I've set up relative line 901 00:34:26,240 --> 00:34:29,750 numbering on the left so wherever my 902 00:34:28,400 --> 00:34:31,580 cursor is it shows the current line 903 00:34:29,750 --> 00:34:33,830 number but everywhere else it's just the 904 00:34:31,580 --> 00:34:35,870 offset from where I am now suppose my 905 00:34:33,830 --> 00:34:38,480 cursor is here but I want to move down 906 00:34:35,870 --> 00:34:40,160 to the like Microsoft Word down here so 907 00:34:38,480 --> 00:34:41,810 that's eight lines down so what 908 00:34:40,160 --> 00:34:44,020 combination of keys would I press to do 909 00:34:41,810 --> 00:34:45,560 that like what's the most efficient way 910 00:34:44,020 --> 00:34:47,810 yeah exactly 911 00:34:45,560 --> 00:34:50,440 let's try that out 8j and my cursor move 912 00:34:47,810 --> 00:34:50,440 down to this line 913 00:34:51,270 --> 00:34:57,880 okay and then one final category of key 914 00:34:56,110 --> 00:34:59,920 meanings in BIM is something called 915 00:34:57,880 --> 00:35:02,200 modifier so we have so far movement 916 00:34:59,920 --> 00:35:04,900 edits counts and finally we have 917 00:35:02,200 --> 00:35:06,520 modifiers so modifiers kind of change 918 00:35:04,900 --> 00:35:08,830 the meaning of a movement command a 919 00:35:06,520 --> 00:35:11,530 little bit and a couple modifiers that 920 00:35:08,830 --> 00:35:15,190 are especially useful are the 8 and I 921 00:35:11,530 --> 00:35:18,010 modifier so a stands for like around and 922 00:35:15,190 --> 00:35:19,900 I stands for inside and to see where 923 00:35:18,010 --> 00:35:21,760 this is really useful I can move my 924 00:35:19,900 --> 00:35:22,480 cursor to somewhere like here for 925 00:35:21,760 --> 00:35:24,670 example 926 00:35:22,480 --> 00:35:26,320 so hopefully most of you are familiar 927 00:35:24,670 --> 00:35:28,240 with markdown syntax and if not it 928 00:35:26,320 --> 00:35:30,490 doesn't matter too much this is a 929 00:35:28,240 --> 00:35:31,780 Lincoln markdown it's a text rendered in 930 00:35:30,490 --> 00:35:33,610 square brackets and then the link in 931 00:35:31,780 --> 00:35:35,500 parentheses suppose my cursor is inside 932 00:35:33,610 --> 00:35:38,350 here and I want to change the text 933 00:35:35,500 --> 00:35:40,150 corresponding to this link well one way 934 00:35:38,350 --> 00:35:43,480 I could do that is like move back here 935 00:35:40,150 --> 00:35:45,130 with B and like to DW and then I to go 936 00:35:43,480 --> 00:35:46,450 into insert mode like that's one of the 937 00:35:45,130 --> 00:35:47,950 many ways I can make this change and I 938 00:35:46,450 --> 00:35:51,070 can type in whatever other thing I want 939 00:35:47,950 --> 00:35:53,410 you to undo huge undo another way could 940 00:35:51,070 --> 00:35:58,030 have done that is change two words C to 941 00:35:53,410 --> 00:35:59,950 W and then type in some other text but 942 00:35:58,030 --> 00:36:03,280 one final way I could do the same change 943 00:35:59,950 --> 00:36:05,380 is using the modifier commands to talk 944 00:36:03,280 --> 00:36:07,120 about how I want to interact with these 945 00:36:05,380 --> 00:36:09,490 different types of grouping things like 946 00:36:07,120 --> 00:36:12,070 parentheses and square brackets so one 947 00:36:09,490 --> 00:36:15,610 final way of doing this is change inside 948 00:36:12,070 --> 00:36:17,440 square brackets CI bracket and that puts 949 00:36:15,610 --> 00:36:20,230 me into insert mode after deleting the 950 00:36:17,440 --> 00:36:21,400 contents that are inside the brackets so 951 00:36:20,230 --> 00:36:22,690 do you see how we can take all these 952 00:36:21,400 --> 00:36:24,310 different ingredients like we talked 953 00:36:22,690 --> 00:36:25,570 about change and we could combine that 954 00:36:24,310 --> 00:36:27,460 with different movement commands we 955 00:36:25,570 --> 00:36:30,100 talked about inside how it's a modifier 956 00:36:27,460 --> 00:36:32,770 and then we talked about X we didn't 957 00:36:30,100 --> 00:36:34,230 talk about parentheses but if your 958 00:36:32,770 --> 00:36:36,070 cursor is hovering over a different 959 00:36:34,230 --> 00:36:37,810 different types of grouping things like 960 00:36:36,070 --> 00:36:39,880 parentheses or square brackets you can 961 00:36:37,810 --> 00:36:40,990 press the percent movement key to jump 962 00:36:39,880 --> 00:36:45,340 back and forth between matching 963 00:36:40,990 --> 00:36:49,510 parentheses if I go over here and I do D 964 00:36:45,340 --> 00:36:52,480 I parentheses I can delete the contents 965 00:36:49,510 --> 00:36:55,780 inside these parentheses and so those 966 00:36:52,480 --> 00:36:57,550 are vim modifiers I guess we talked 967 00:36:55,780 --> 00:37:00,310 about I but we didn't talk about a if I 968 00:36:57,550 --> 00:37:02,080 do D a parenthesis it deletes a whole 969 00:37:00,310 --> 00:37:04,460 like parenthesized group including the 970 00:37:02,080 --> 00:37:10,730 parentheses so I is inside 971 00:37:04,460 --> 00:37:11,839 is around or including all right so 972 00:37:10,730 --> 00:37:13,670 those are basically the different 973 00:37:11,839 --> 00:37:15,890 categories of things you can combine 974 00:37:13,670 --> 00:37:18,050 together when interacting with VIMS 975 00:37:15,890 --> 00:37:20,330 interface so any questions about that or 976 00:37:18,050 --> 00:37:28,820 the overall idea of this interface being 977 00:37:20,330 --> 00:37:31,580 a programming language cool so let's do 978 00:37:28,820 --> 00:37:33,859 a quick demo to kind of demonstrate the 979 00:37:31,580 --> 00:37:36,290 power of this editor and it will kind of 980 00:37:33,859 --> 00:37:38,240 help us see how this tool can work 981 00:37:36,290 --> 00:37:41,260 really fast and kind of match the speed 982 00:37:38,240 --> 00:37:43,760 at which we think so over here is a very 983 00:37:41,260 --> 00:37:44,780 broken fizzbuzz implementation that 984 00:37:43,760 --> 00:37:46,640 doesn't actually print anything 985 00:37:44,780 --> 00:37:48,680 hopefully most of you have heard of 986 00:37:46,640 --> 00:37:51,080 fizzbuzz if not I'll explain it super 987 00:37:48,680 --> 00:37:52,730 briefly this buzz is a programming 988 00:37:51,080 --> 00:37:54,290 exercise where you print the numbers 1 989 00:37:52,730 --> 00:37:56,540 through n but when the number is 990 00:37:54,290 --> 00:37:58,700 divisible by 3 you print fizz when it's 991 00:37:56,540 --> 00:38:00,859 divisible by 5 you print buzz and when 992 00:37:58,700 --> 00:38:02,839 it's divisible by both 3 & 5 you print 993 00:38:00,859 --> 00:38:05,089 fizzbuzz and if none of those apply you 994 00:38:02,839 --> 00:38:09,290 just print the number so you should 995 00:38:05,089 --> 00:38:13,460 print like 1 2 fizz for buzz and so on 996 00:38:09,290 --> 00:38:16,550 but if I run this program it doesn't 997 00:38:13,460 --> 00:38:20,089 print anything here I have them on the 998 00:38:16,550 --> 00:38:21,530 left in just a terminal on the right ok 999 00:38:20,089 --> 00:38:23,750 so there's a bunch of issues with this 1000 00:38:21,530 --> 00:38:26,470 one is that main is never called so 1001 00:38:23,750 --> 00:38:29,450 let's start off with fixing that so 1002 00:38:26,470 --> 00:38:31,960 here's how I would make this change and 1003 00:38:29,450 --> 00:38:34,250 notice how few keystrokes this requires 1004 00:38:31,960 --> 00:38:37,609 capital G means go to the bottom of the 1005 00:38:34,250 --> 00:38:39,650 file o opens a new line below and now I 1006 00:38:37,609 --> 00:38:45,380 can just type in stuff so I'm an insert 1007 00:38:39,650 --> 00:38:47,210 mode okay so I've typed in whatever 1008 00:38:45,380 --> 00:38:50,480 change I want to make escape to go back 1009 00:38:47,210 --> 00:38:53,540 to normal mode if I do : W so command 1010 00:38:50,480 --> 00:38:54,650 mode right let me go back here okay now 1011 00:38:53,540 --> 00:38:56,690 at least my program prints something 1012 00:38:54,650 --> 00:38:58,940 when I run it another issue with this 1013 00:38:56,690 --> 00:39:02,750 program is that it starts at 0 instead 1014 00:38:58,940 --> 00:39:05,030 of 1 so let's go fix that so I want to 1015 00:39:02,750 --> 00:39:06,950 go over to this range whoops this range 1016 00:39:05,030 --> 00:39:08,480 thing and it shouldn't be going from 0 1017 00:39:06,950 --> 00:39:11,270 to limit it should be going from 1 to 1018 00:39:08,480 --> 00:39:12,650 limit plus 1 1 command which I didn't 1019 00:39:11,270 --> 00:39:16,060 show you about is how you search in vim 1020 00:39:12,650 --> 00:39:16,060 so you press forward slash 1021 00:39:17,010 --> 00:39:21,930 to close this and restart it if you 1022 00:39:19,080 --> 00:39:24,840 press forward slash it starts search so 1023 00:39:21,930 --> 00:39:26,220 if I type in range enter my cursor goes 1024 00:39:24,840 --> 00:39:27,810 from wherever it was before to the first 1025 00:39:26,220 --> 00:39:28,920 instance of range it found so it's a 1026 00:39:27,810 --> 00:39:31,680 really efficient way of moving where I 1027 00:39:28,920 --> 00:39:33,990 want to move WW to move forward two 1028 00:39:31,680 --> 00:39:36,330 words I to go into insert mode add the 1029 00:39:33,990 --> 00:39:38,310 one comma space escape I'm back in 1030 00:39:36,330 --> 00:39:40,080 normal mode this is a very common 1031 00:39:38,310 --> 00:39:41,850 pattern in vim you stay in normal mode 1032 00:39:40,080 --> 00:39:43,260 you go somewhere you go into insert mode 1033 00:39:41,850 --> 00:39:44,880 you make a tiny change and you jump 1034 00:39:43,260 --> 00:39:45,900 right back to normal mode like normal 1035 00:39:44,880 --> 00:39:48,810 mode is home and that's where you should 1036 00:39:45,900 --> 00:39:51,030 be most of the time I also want to add a 1037 00:39:48,810 --> 00:39:55,430 plus one so e to go to the end of this 1038 00:39:51,030 --> 00:39:58,140 word a for a pend plus one escape 1039 00:39:55,430 --> 00:40:00,810 alright fix that problem and other issue 1040 00:39:58,140 --> 00:40:02,940 is that this program prints fizz for 1041 00:40:00,810 --> 00:40:05,970 both divisible by three and five so 1042 00:40:02,940 --> 00:40:07,920 let's fix that slash fizz searches for 1043 00:40:05,970 --> 00:40:11,790 fizz been oppressed and it goes to the 1044 00:40:07,920 --> 00:40:13,710 next match see I press E I quote changes 1045 00:40:11,790 --> 00:40:15,660 what's inside the quote so it's deleted 1046 00:40:13,710 --> 00:40:17,460 the fizz and put me in insert mode right 1047 00:40:15,660 --> 00:40:18,510 in between those two quotes and I can 1048 00:40:17,460 --> 00:40:23,460 type in whatever I want 1049 00:40:18,510 --> 00:40:26,630 escape to go back to normal mode so 1050 00:40:23,460 --> 00:40:28,890 great I've fixed that particular problem 1051 00:40:26,630 --> 00:40:31,710 another problem with this program is 1052 00:40:28,890 --> 00:40:37,710 that it prints fizz and Buzz on separate 1053 00:40:31,710 --> 00:40:42,150 lines for multiples of 15 so let's let's 1054 00:40:37,710 --> 00:40:42,870 go and fix that let me go down to this 1055 00:40:42,150 --> 00:40:44,580 line here 1056 00:40:42,870 --> 00:40:46,350 one way I can don't actually worry about 1057 00:40:44,580 --> 00:40:47,430 like the actual contents of this program 1058 00:40:46,350 --> 00:40:48,690 like this some stupid program that 1059 00:40:47,430 --> 00:40:51,000 doesn't matter pay attention to what 1060 00:40:48,690 --> 00:40:52,170 keys I'm pressing in vim that allow me 1061 00:40:51,000 --> 00:40:54,960 to make changes to this program really 1062 00:40:52,170 --> 00:40:56,790 efficiently so my cursor is on this line 1063 00:40:54,960 --> 00:40:59,460 i press dollar to go to the end of this 1064 00:40:56,790 --> 00:41:01,170 line i for insert mode okay and i'm 1065 00:40:59,460 --> 00:41:03,330 typing some stuff escape to go back to 1066 00:41:01,170 --> 00:41:07,050 normal mode now I want to make the same 1067 00:41:03,330 --> 00:41:11,610 change the print below look at this JJ 1068 00:41:07,050 --> 00:41:13,260 dot so what dot dozen vim is it repeats 1069 00:41:11,610 --> 00:41:15,990 the previous editing command that was 1070 00:41:13,260 --> 00:41:17,880 made and so this is a really nice way of 1071 00:41:15,990 --> 00:41:19,890 doing repetitive tasks without typing 1072 00:41:17,880 --> 00:41:21,630 the same thing over and over again so in 1073 00:41:19,890 --> 00:41:24,630 that particular case that inserted comma 1074 00:41:21,630 --> 00:41:27,110 end quote and so it applied the same 1075 00:41:24,630 --> 00:41:29,580 thing on this line when I press dot and 1076 00:41:27,110 --> 00:41:30,690 then when I guess one final part of this 1077 00:41:29,580 --> 00:41:32,930 demo is 1078 00:41:30,690 --> 00:41:34,620 we will fix the issue that this program 1079 00:41:32,930 --> 00:41:35,670 maybe should take a command-line 1080 00:41:34,620 --> 00:41:38,520 argument instead of having this 1081 00:41:35,670 --> 00:41:40,440 hard-coded 10 down here so how do we do 1082 00:41:38,520 --> 00:41:43,170 that I'll press GG to go to the top 1083 00:41:40,440 --> 00:41:44,490 capital o so now I've opened a line 1084 00:41:43,170 --> 00:41:47,220 above and I'm going to type in some text 1085 00:41:44,490 --> 00:41:49,710 like imports this enter escape to go 1086 00:41:47,220 --> 00:41:52,110 back to normal mode and then I want to 1087 00:41:49,710 --> 00:41:54,870 go down to where this 10 is so slash 10 1088 00:41:52,110 --> 00:41:57,540 makes me jump straight down there CI 1089 00:41:54,870 --> 00:41:59,760 pren to edit what's inside the 1090 00:41:57,540 --> 00:42:02,150 parentheses and now I can type in like 1091 00:41:59,760 --> 00:42:07,080 whatever thing I need to type in here 1092 00:42:02,150 --> 00:42:09,840 and then once I've done this my program 1093 00:42:07,080 --> 00:42:10,920 does fizzbuzz correctly I think I missed 1094 00:42:09,840 --> 00:42:12,390 one change I wanted to make but it 1095 00:42:10,920 --> 00:42:14,540 doesn't matter this demonstrates that 1096 00:42:12,390 --> 00:42:17,250 you can make lots of changes really fast 1097 00:42:14,540 --> 00:42:23,400 so any questions about this demo or the 1098 00:42:17,250 --> 00:42:27,960 overall idea we've been talking about ok 1099 00:42:23,400 --> 00:42:29,550 so this will be covered Tuesday so the 1100 00:42:27,960 --> 00:42:31,710 kind of outside environment I'm running 1101 00:42:29,550 --> 00:42:33,630 vim on the left and my shell on the 1102 00:42:31,710 --> 00:42:38,910 right and then this is team ox on the 1103 00:42:33,630 --> 00:42:39,900 outside one variant of that question 1104 00:42:38,910 --> 00:42:41,670 might be like how do you switch between 1105 00:42:39,900 --> 00:42:42,840 different vim windows and you can see 1106 00:42:41,670 --> 00:42:44,250 the lecture notes for that but there's a 1107 00:42:42,840 --> 00:42:45,720 key binding for that so if you have the 1108 00:42:44,250 --> 00:42:50,240 same window open or multiple things open 1109 00:42:45,720 --> 00:42:50,240 there's a way of doing that question ah 1110 00:42:50,840 --> 00:42:56,520 good question so delete takes a motion 1111 00:42:54,570 --> 00:42:58,110 and then removes those contents but 1112 00:42:56,520 --> 00:43:00,120 keeps you in normal mode so you can keep 1113 00:42:58,110 --> 00:43:02,430 just moving around in a file what change 1114 00:43:00,120 --> 00:43:03,900 does is very similar to delete it takes 1115 00:43:02,430 --> 00:43:06,150 motions and treats them in the same way 1116 00:43:03,900 --> 00:43:07,980 deletes those contents but then puts you 1117 00:43:06,150 --> 00:43:11,280 in insert mode and so it saves you from 1118 00:43:07,980 --> 00:43:13,290 typing one extra keystroke so if I'm 1119 00:43:11,280 --> 00:43:16,380 here for example I want to delete main 1120 00:43:13,290 --> 00:43:18,240 DW deletes a word but now if I press 1121 00:43:16,380 --> 00:43:21,720 whatever key likes I press J it just 1122 00:43:18,240 --> 00:43:23,490 moved me down if I undo that do cw4 1123 00:43:21,720 --> 00:43:24,810 change a word now it's actually put me 1124 00:43:23,490 --> 00:43:28,640 into insert mode and I can type in 1125 00:43:24,810 --> 00:43:31,890 whatever I want it to insert so DWI is 1126 00:43:28,640 --> 00:43:33,810 the same thing as CW but it saves a 1127 00:43:31,890 --> 00:43:35,280 keystroke one thing we've linked in the 1128 00:43:33,810 --> 00:43:37,140 resources is something called vim golf 1129 00:43:35,280 --> 00:43:39,840 basically people have set up a game 1130 00:43:37,140 --> 00:43:41,400 online where you can get an editing task 1131 00:43:39,840 --> 00:43:43,590 and try to figure out the minimal number 1132 00:43:41,400 --> 00:43:44,490 of keystrokes necessary to complete that 1133 00:43:43,590 --> 00:43:46,020 editing 1134 00:43:44,490 --> 00:43:47,340 it's actually really addictive so I'd 1135 00:43:46,020 --> 00:43:52,680 only suggest going on their chest and 1136 00:43:47,340 --> 00:44:00,450 script time I think I saw a hand for 1137 00:43:52,680 --> 00:44:02,070 another question yeah uh period yeah one 1138 00:44:00,450 --> 00:44:05,750 of the most useful of em commands good 1139 00:44:02,070 --> 00:44:05,750 question any other questions 1140 00:44:06,740 --> 00:44:13,260 cool so I think we have about five 1141 00:44:10,800 --> 00:44:14,760 minutes left and I'm gonna briefly talk 1142 00:44:13,260 --> 00:44:15,990 about a thing that's also covered in 1143 00:44:14,760 --> 00:44:19,470 detail in the notes so make sure you 1144 00:44:15,990 --> 00:44:22,349 look at the notes for this so vim is a 1145 00:44:19,470 --> 00:44:24,420 programmers text editor and so of course 1146 00:44:22,349 --> 00:44:25,740 it's highly programmable not only 1147 00:44:24,420 --> 00:44:27,720 through its interface that's a 1148 00:44:25,740 --> 00:44:29,099 programming language but also a couple 1149 00:44:27,720 --> 00:44:31,050 of different ways there's lots of 1150 00:44:29,099 --> 00:44:32,970 settings that you can tweak to match 1151 00:44:31,050 --> 00:44:34,740 your preferences and you can also 1152 00:44:32,970 --> 00:44:37,590 install plugins for them that do all 1153 00:44:34,740 --> 00:44:40,380 sorts of useful stuff so the way vim is 1154 00:44:37,590 --> 00:44:42,930 configured is through a file on disk 1155 00:44:40,380 --> 00:44:45,480 called vim RC and you'll see this is a 1156 00:44:42,930 --> 00:44:47,340 common pattern in a lot of shell based 1157 00:44:45,480 --> 00:44:49,349 tools there'll be a plain text file that 1158 00:44:47,340 --> 00:44:50,880 configures how the Tool Works and so if 1159 00:44:49,349 --> 00:44:53,670 I edit this file and it may or may not 1160 00:44:50,880 --> 00:44:56,310 exist on your machine yet but I've 1161 00:44:53,670 --> 00:44:58,170 downloaded the we've created a kind of 1162 00:44:56,310 --> 00:44:59,430 default vim RC for you and linked it on 1163 00:44:58,170 --> 00:45:02,190 the course website so you can start with 1164 00:44:59,430 --> 00:45:04,859 that one if I do vim tilde slash boom RC 1165 00:45:02,190 --> 00:45:07,080 I can see here a bunch of comments and 1166 00:45:04,859 --> 00:45:09,060 then particular commands like by default 1167 00:45:07,080 --> 00:45:11,280 we want syntax highlighting on and we 1168 00:45:09,060 --> 00:45:12,750 want line numbers if we didn't do some 1169 00:45:11,280 --> 00:45:14,880 of these things like let me remove the 1170 00:45:12,750 --> 00:45:16,500 stuff that sets line numbers if I remove 1171 00:45:14,880 --> 00:45:17,790 those configurations and relaunch vim 1172 00:45:16,500 --> 00:45:21,270 notice that I no longer have line 1173 00:45:17,790 --> 00:45:23,099 numbers on the left but yeah so in short 1174 00:45:21,270 --> 00:45:26,099 there's a lot of stuff you can configure 1175 00:45:23,099 --> 00:45:28,589 with them we've given you a very basic 1176 00:45:26,099 --> 00:45:29,880 configuration that tries to like remove 1177 00:45:28,589 --> 00:45:32,160 some of the kind of weird behavior 1178 00:45:29,880 --> 00:45:33,480 that's on by default in vim but we don't 1179 00:45:32,160 --> 00:45:35,550 really try to enforce too many of our 1180 00:45:33,480 --> 00:45:37,080 other opinions on you but of course like 1181 00:45:35,550 --> 00:45:39,210 the three of us used them a lot and we 1182 00:45:37,080 --> 00:45:41,310 have heavily customized VMR C's so we've 1183 00:45:39,210 --> 00:45:42,480 linked to our personal configurations 1184 00:45:41,310 --> 00:45:44,550 too if you want to take anything from 1185 00:45:42,480 --> 00:45:46,050 that and also like thousands or like 1186 00:45:44,550 --> 00:45:47,640 millions of people share their var C's 1187 00:45:46,050 --> 00:45:48,450 on github so there's lots of places to 1188 00:45:47,640 --> 00:45:49,920 look for inspiration 1189 00:45:48,450 --> 00:45:53,040 there's also cool blog posts on this 1190 00:45:49,920 --> 00:45:54,810 topic another thing you can do in vim is 1191 00:45:53,040 --> 00:45:56,820 you can extend it with plugins that do 1192 00:45:54,810 --> 00:45:58,080 all sorts of useful things this lets you 1193 00:45:56,820 --> 00:45:59,730 do things like fuzzy file 1194 00:45:58,080 --> 00:46:00,960 finding which a lot of text editors come 1195 00:45:59,730 --> 00:46:02,790 with by default so you can get like a 1196 00:46:00,960 --> 00:46:04,710 pop-up window you can type in a name of 1197 00:46:02,790 --> 00:46:07,020 a file or approximately the name of a 1198 00:46:04,710 --> 00:46:08,480 file and find it very quickly or there 1199 00:46:07,020 --> 00:46:10,920 are things that show you like 1200 00:46:08,480 --> 00:46:14,970 visualizations of undo history there are 1201 00:46:10,920 --> 00:46:16,350 things that show you like file explorers 1202 00:46:14,970 --> 00:46:18,360 things like that so we've linked to a 1203 00:46:16,350 --> 00:46:20,520 couple of our favorite plugins on the 1204 00:46:18,360 --> 00:46:22,230 course website and so I highly recommend 1205 00:46:20,520 --> 00:46:23,340 becoming familiar with how to install a 1206 00:46:22,230 --> 00:46:24,840 plug-in because it takes like three 1207 00:46:23,340 --> 00:46:29,580 seconds and some of them are really cool 1208 00:46:24,840 --> 00:46:32,130 and then finally the last topic I'll 1209 00:46:29,580 --> 00:46:34,680 briefly mention before we finish today's 1210 00:46:32,130 --> 00:46:37,170 lecture is vim mode and other programs 1211 00:46:34,680 --> 00:46:38,760 so turns out that a lot of programmers 1212 00:46:37,170 --> 00:46:40,650 we're really excited about VIMS 1213 00:46:38,760 --> 00:46:42,780 interface and so they've implemented 1214 00:46:40,650 --> 00:46:44,730 similar functionality and other tools 1215 00:46:42,780 --> 00:46:47,730 for example like I've configured my 1216 00:46:44,730 --> 00:46:49,530 Python repple to run in vim mode so I 1217 00:46:47,730 --> 00:46:51,720 can like type in stuff here and if I 1218 00:46:49,530 --> 00:46:53,250 press escape now I'm in normal mode in 1219 00:46:51,720 --> 00:46:55,230 my Python repple and I can like move 1220 00:46:53,250 --> 00:46:58,190 back and forth and like press X here 1221 00:46:55,230 --> 00:47:01,530 delete a thing like CW change a word and 1222 00:46:58,190 --> 00:47:03,210 do all those good things and it's not 1223 00:47:01,530 --> 00:47:05,910 just the Python repple like I have my 1224 00:47:03,210 --> 00:47:07,890 terminal behaving this way too so like I 1225 00:47:05,910 --> 00:47:10,050 can type in whatever I want here and 1226 00:47:07,890 --> 00:47:11,430 like escape and I'm in normal mode I can 1227 00:47:10,050 --> 00:47:13,320 go here and like go into visual mode 1228 00:47:11,430 --> 00:47:15,570 inside my terminal and like select 1229 00:47:13,320 --> 00:47:19,680 blocks of text press tilde to change the 1230 00:47:15,570 --> 00:47:22,080 case whatever so we've linked sir like 1231 00:47:19,680 --> 00:47:25,800 how exactly you can enable vim mode for 1232 00:47:22,080 --> 00:47:27,510 like bash z shell fish a lot of read 1233 00:47:25,800 --> 00:47:28,710 line based programs like jupiter 1234 00:47:27,510 --> 00:47:30,330 notebook a whole bunch of other things 1235 00:47:28,710 --> 00:47:32,130 and if it's not another place you can 1236 00:47:30,330 --> 00:47:33,840 probably find it by googling it because 1237 00:47:32,130 --> 00:47:36,030 a lot of people like to have this sort 1238 00:47:33,840 --> 00:47:37,380 of functionality and if you're really 1239 00:47:36,030 --> 00:47:39,270 gonna like commit to learning them I 1240 00:47:37,380 --> 00:47:41,490 think it's valuable to enable this sort 1241 00:47:39,270 --> 00:47:43,080 of like vim emulation mode in every tool 1242 00:47:41,490 --> 00:47:44,970 you use is like one or like make you 1243 00:47:43,080 --> 00:47:46,800 learn the tool a lot better and to once 1244 00:47:44,970 --> 00:47:47,970 you become good at vim like those skills 1245 00:47:46,800 --> 00:47:53,130 will now transfer to all your other 1246 00:47:47,970 --> 00:47:54,840 tools you use okay so I think that's it 1247 00:47:53,130 --> 00:47:57,060 for our rapid introduction to them 1248 00:47:54,840 --> 00:47:58,320 there's some other neat material that we 1249 00:47:57,060 --> 00:47:59,790 weren't able to fit in today's lecture 1250 00:47:58,320 --> 00:48:01,140 but it's in the lecture notes and then 1251 00:47:59,790 --> 00:48:02,880 finally I highly recommend going through 1252 00:48:01,140 --> 00:48:05,220 the exercises for today like at least 1253 00:48:02,880 --> 00:48:07,440 for me personally I think spending time 1254 00:48:05,220 --> 00:48:08,910 learning my text editor has been like 1255 00:48:07,440 --> 00:48:10,140 the most beneficial thing out of like 1256 00:48:08,910 --> 00:48:11,580 the kinds of things we're teaching in 1257 00:48:10,140 --> 00:48:14,020 this class 1258 00:48:11,580 --> 00:48:15,540 so yeah that's it for today's lecture 1259 00:48:14,020 --> 00:48:17,530 and we'll see you tomorrow 1260 00:48:15,540 --> 00:48:20,320 note that we've changed tomorrow's 1261 00:48:17,530 --> 00:48:22,060 lecture to data wrangling Thursday and 1262 00:48:20,320 --> 00:48:23,500 Tuesday lectures are now switched this 1263 00:48:22,060 --> 00:48:25,000 is reflected on the course website in 1264 00:48:23,500 --> 00:48:27,510 case anybody was going to come to one 1265 00:48:25,000 --> 00:48:27,510 but not the other