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diff --git a/2022/captions/emacsconf-2022-justl--justl-driving-recipes-within-emacs--sibi-prabakaran--main.vtt b/2022/captions/emacsconf-2022-justl--justl-driving-recipes-within-emacs--sibi-prabakaran--main.vtt new file mode 100644 index 00000000..cd239aa8 --- /dev/null +++ b/2022/captions/emacsconf-2022-justl--justl-driving-recipes-within-emacs--sibi-prabakaran--main.vtt @@ -0,0 +1,826 @@ +WEBVTT captioned by sachac
+
+00:00:00.000 --> 00:00:04.240
+Hi everyone, I am Sibi Prabakaran
+
+00:00:04.240 --> 00:00:09.560
+and welcome to my session on Justl Emacs Mode.
+
+00:00:09.560 --> 00:00:11.640
+A bit about me, I have been working
+
+00:00:11.640 --> 00:00:12.880
+as a Haskell Engineer
+
+00:00:12.880 --> 00:00:15.600
+at FPComplete for the last 4 years.
+
+00:00:15.600 --> 00:00:17.400
+I am based out of India.
+
+00:00:17.400 --> 00:00:20.680
+I occasionally blog at my website psibi.in
+
+00:00:20.680 --> 00:00:23.560
+where you can find more information about me.
+
+00:00:23.560 --> 00:00:25.000
+I have been using Emacs
+
+00:00:25.000 --> 00:00:26.920
+for more than a decade now.
+
+00:00:26.920 --> 00:00:28.160
+I help in the maintenance
+
+00:00:28.160 --> 00:00:31.080
+of the Terraform client for LSP mode.
+
+00:00:31.080 --> 00:00:33.960
+I have also authored dhall-mode and rego-mode
+
+00:00:33.960 --> 00:00:35.000
+which are the major modes
+
+00:00:35.000 --> 00:00:39.320
+for the respective languages.
+
+00:00:39.320 --> 00:00:40.680
+Before jumping into the demo
+
+00:00:40.680 --> 00:00:42.040
+of the Emacs package,
+
+00:00:42.040 --> 00:00:44.160
+I would like to give a brief introduction
+
+00:00:44.160 --> 00:00:46.280
+about justfiles and what it is.
+
+00:00:46.280 --> 00:00:49.000
+I will also try to compare it with Makefiles
+
+00:00:49.000 --> 00:00:53.640
+as it takes a lot of inspiration from it.
+
+00:00:53.640 --> 00:00:55.640
+What you see currently in the buffer
+
+00:00:55.640 --> 00:00:57.320
+is a sample justfile.
+
+00:00:57.320 --> 00:00:59.480
+If you have previously used Makefiles,
+
+00:00:59.480 --> 00:01:00.480
+you would be able to see
+
+00:01:00.480 --> 00:01:02.280
+that there is quite a bit of similarity
+
+00:01:02.280 --> 00:01:03.560
+between them.
+
+00:01:03.560 --> 00:01:05.080
+Anything that starts with hash
+
+00:01:05.080 --> 00:01:07.120
+is a documentation comment.
+
+00:01:07.120 --> 00:01:09.160
+You can see that I have the first recipe
+
+00:01:09.160 --> 00:01:10.920
+which is named as default.
+
+00:01:10.920 --> 00:01:12.520
+So if you run the just executable
+
+00:01:12.520 --> 00:01:14.120
+without any arguments,
+
+00:01:14.120 --> 00:01:15.400
+by default it is going to run
+
+00:01:15.400 --> 00:01:17.200
+the first recipe.
+
+00:01:17.200 --> 00:01:18.440
+This recipe's definition
+
+00:01:18.440 --> 00:01:20.080
+calls the just command
+
+00:01:20.080 --> 00:01:21.920
+in turn, with the two arguments,
+
+00:01:21.920 --> 00:01:24.080
+namely --list and --unsorted,
+
+00:01:24.080 --> 00:01:25.680
+which basically asks just
+
+00:01:25.680 --> 00:01:27.800
+to list down all the recipes
+
+00:01:27.800 --> 00:01:29.680
+in an unsorted order.
+
+00:01:29.680 --> 00:01:32.400
+Each line of each recipe is executed
+
+00:01:32.400 --> 00:01:33.920
+by a fresh shell.
+
+00:01:33.920 --> 00:01:35.120
+That pretty much
+
+00:01:35.120 --> 00:01:36.360
+is the high level overview
+
+00:01:36.360 --> 00:01:38.520
+of getting started to use this tool.
+
+00:01:38.520 --> 00:01:40.760
+This tool assumes the presence of a shell
+
+00:01:40.760 --> 00:01:43.480
+which is bash in most GNU/Linux systems,
+
+00:01:43.480 --> 00:01:44.840
+but you can configure it
+
+00:01:44.840 --> 00:01:47.160
+to explicitly use any specific shell
+
+00:01:47.160 --> 00:01:48.520
+you have in mind.
+
+00:01:48.520 --> 00:01:50.480
+Let me in fact go and try executing
+
+00:01:50.480 --> 00:01:52.600
+the first recipe.
+
+00:01:52.600 --> 00:01:53.760
+I will first execute it
+
+00:01:53.760 --> 00:01:55.160
+without any arguments,
+
+00:01:55.160 --> 00:01:59.000
+which will force it to run the first recipe.
+
+00:01:59.000 --> 00:02:01.800
+As you can see, it listed all the recipes.
+
+00:02:01.800 --> 00:02:03.200
+Now I can actually execute
+
+00:02:03.200 --> 00:02:04.200
+a particular recipe
+
+00:02:04.200 --> 00:02:06.640
+by passing an explicit recipe name.
+
+00:02:06.640 --> 00:02:08.400
+Let me execute the hello recipe now
+
+00:02:08.400 --> 00:02:11.920
+which will basically print "hello world".
+
+00:02:11.920 --> 00:02:15.320
+It works as expected.
+
+00:02:15.320 --> 00:02:17.040
+As you can see, that's all that's required
+
+00:02:17.040 --> 00:02:18.600
+to get started with this tool.
+
+00:02:18.600 --> 00:02:20.348
+You create a file named justfile
+
+00:02:20.349 --> 00:02:22.800
+in a directory, define some recipes
+
+00:02:22.800 --> 00:02:23.640
+and then run them
+
+00:02:23.640 --> 00:02:27.680
+via the just executable.
+
+00:02:27.680 --> 00:02:28.440
+Note that there are
+
+00:02:28.440 --> 00:02:30.680
+various other features in justfile.
+
+00:02:30.680 --> 00:02:32.240
+You can define variables,
+
+00:02:32.240 --> 00:02:33.280
+mark some variables
+
+00:02:33.280 --> 00:02:35.520
+to be exported as environment variables,
+
+00:02:35.520 --> 00:02:37.280
+have optional parameters
+
+00:02:37.280 --> 00:02:38.800
+that can be passed to a recipe.
+
+00:02:38.800 --> 00:02:40.960
+You can also set up dependency
+
+00:02:40.960 --> 00:02:42.480
+between recipes
+
+00:02:42.480 --> 00:02:44.920
+and also write scripts within a recipe
+
+00:02:44.920 --> 00:02:46.800
+in a language of your choice.
+
+00:02:46.800 --> 00:02:48.560
+I won't be going into the details,
+
+00:02:48.560 --> 00:02:50.120
+but I encourage you to go through
+
+00:02:50.120 --> 00:02:51.640
+the very helpful manual page
+
+00:02:51.640 --> 00:02:56.440
+to learn more about it.
+
+00:02:56.440 --> 00:02:59.200
+Also, let me compare it with Makefiles.
+
+00:02:59.200 --> 00:03:00.800
+I do think it's kind of unfair
+
+00:03:00.800 --> 00:03:02.160
+to compare both the tools
+
+00:03:02.160 --> 00:03:04.760
+since make is a build automation tool
+
+00:03:04.760 --> 00:03:07.520
+whereas just's goal is a task runner,
+
+00:03:07.520 --> 00:03:09.320
+and since just doesn't try to be
+
+00:03:09.320 --> 00:03:10.440
+a build system,
+
+00:03:10.440 --> 00:03:12.480
+it can avoid the associated complexity
+
+00:03:12.480 --> 00:03:15.080
+that comes with the tool like make.
+
+00:03:15.080 --> 00:03:17.040
+There is one nice historical fact
+
+00:03:17.040 --> 00:03:18.200
+about just.
+
+00:03:18.200 --> 00:03:19.560
+The initial version of just
+
+00:03:19.560 --> 00:03:21.640
+relied on make command being available,
+
+00:03:21.640 --> 00:03:23.360
+so it was basically
+
+00:03:23.360 --> 00:03:25.440
+a glorified wrapper around it.
+
+00:03:25.440 --> 00:03:26.440
+But it was removed,
+
+00:03:26.440 --> 00:03:27.760
+and justfile doesn't have
+
+00:03:27.760 --> 00:03:29.680
+that dependency anymore.
+
+00:03:29.680 --> 00:03:31.680
+If you are using make as a task runner
+
+00:03:31.680 --> 00:03:33.400
+then you would have to use
+
+00:03:33.400 --> 00:03:35.400
+something called phony targets.
+
+00:03:35.400 --> 00:03:37.240
+I don't want to go into the details,
+
+00:03:37.240 --> 00:03:39.240
+but makefiles have good reason
+
+00:03:39.240 --> 00:03:41.040
+for why they need something like that.
+
+00:03:41.040 --> 00:03:44.080
+Since justfile is not a build system,
+
+00:03:44.080 --> 00:03:45.200
+it doesn't have to deal with them.
+
+00:03:45.200 --> 00:03:47.400
+The error message
+
+00:03:47.400 --> 00:03:48.680
+and user experience of this tool,
+
+00:03:48.680 --> 00:03:50.480
+in my opinion, is better.
+
+00:03:50.480 --> 00:03:52.760
+To show you a concrete example,
+
+00:03:52.760 --> 00:03:54.920
+justfile errors out by default
+
+00:03:54.920 --> 00:03:56.400
+if you have duplicate recipes.
+
+00:03:56.400 --> 00:03:58.840
+This is in contrast with make
+
+00:03:58.840 --> 00:04:00.720
+where I believe it prints out
+
+00:04:00.720 --> 00:04:01.760
+a warning about it,
+
+00:04:01.760 --> 00:04:03.840
+but still executes the target action.
+
+00:04:03.840 --> 00:04:06.600
+Justfile also gives you the ability
+
+00:04:06.600 --> 00:04:08.200
+to easily create scripts
+
+00:04:08.200 --> 00:04:10.680
+written in any language within a recipe.
+
+00:04:10.680 --> 00:04:12.680
+My personal opinion is that
+
+00:04:12.680 --> 00:04:14.200
+if you are using makefile
+
+00:04:14.200 --> 00:04:15.200
+as a task runner,
+
+00:04:15.200 --> 00:04:17.440
+you might want to check out justfile
+
+00:04:17.440 --> 00:04:19.280
+to see if it will suit your workflow.
+
+00:04:19.280 --> 00:04:25.000
+With that, I'll move on to justl.el,
+
+00:04:25.000 --> 00:04:26.800
+which is basically an Emacs package
+
+00:04:26.800 --> 00:04:28.120
+for driving justfiles.
+
+00:04:28.120 --> 00:04:29.920
+I started writing this tool
+
+00:04:29.920 --> 00:04:31.200
+around a year ago
+
+00:04:31.200 --> 00:04:33.720
+when my usage of justfile increased.
+
+00:04:33.720 --> 00:04:35.440
+The objective of the tool
+
+00:04:35.440 --> 00:04:37.480
+is to reduce the usage of the CLI
+
+00:04:37.480 --> 00:04:40.040
+and drive the execution of the recipes
+
+00:04:40.040 --> 00:04:41.480
+natively within the editor.
+
+00:04:41.480 --> 00:04:44.000
+Let me take you back to the justfile
+
+00:04:44.000 --> 00:04:45.240
+which we saw previously.
+
+00:04:45.240 --> 00:04:47.320
+This time we will drive it
+
+00:04:47.320 --> 00:04:48.840
+within the editor itself,
+
+00:04:48.840 --> 00:04:51.400
+instead of executing commands via vterm
+
+00:04:51.400 --> 00:04:52.400
+as done previously.
+
+00:04:52.400 --> 00:04:54.640
+So the idea is you either
+
+00:04:54.640 --> 00:04:56.000
+open the justfile,
+
+00:04:56.000 --> 00:04:57.840
+or any other file in the directory.
+
+00:04:57.840 --> 00:04:59.160
+That doesn't matter, actually.
+
+00:04:59.160 --> 00:05:00.720
+Once you do that,
+
+00:05:00.720 --> 00:05:02.360
+you call the justl command.
+
+00:05:02.360 --> 00:05:06.640
+Now as you can see, it lists down
+
+00:05:06.640 --> 00:05:07.520
+all the recipes,
+
+00:05:07.520 --> 00:05:09.280
+along with the description if present.
+
+00:05:09.280 --> 00:05:11.520
+You can move on to different recipes
+
+00:05:11.520 --> 00:05:13.080
+by your usual keybinding.
+
+00:05:13.080 --> 00:05:15.680
+And for executing a specific recipe,
+
+00:05:15.680 --> 00:05:18.240
+you have to press the e keybinding,
+
+00:05:18.240 --> 00:05:19.720
+and that will run the recipe
+
+00:05:19.720 --> 00:05:21.600
+and show its output
+
+00:05:21.600 --> 00:05:23.400
+on a special buffer named *just*
+
+00:05:23.400 --> 00:05:25.000
+which is built on top of
+
+00:05:25.000 --> 00:05:27.040
+the compilation mode available in Emacs.
+
+00:05:27.040 --> 00:05:28.760
+Let me actually try
+
+00:05:28.760 --> 00:05:30.240
+executing the hello recipe
+
+00:05:30.240 --> 00:05:32.440
+which we previously executed in vterm.
+
+00:05:32.440 --> 00:05:38.160
+As you can see,
+
+00:05:38.160 --> 00:05:39.680
+it executed the recipe
+
+00:05:39.680 --> 00:05:41.120
+and the "hello world" output
+
+00:05:41.120 --> 00:05:42.400
+is visible in the just buffer.
+
+00:05:42.400 --> 00:05:44.400
+You can also see that there is
+
+00:05:44.400 --> 00:05:45.880
+other metadata like
+
+00:05:45.880 --> 00:05:47.480
+when it started executing
+
+00:05:47.480 --> 00:05:49.520
+and when did it finish executing.
+
+00:05:49.520 --> 00:05:51.520
+If a recipe execution fails,
+
+00:05:51.520 --> 00:05:53.160
+it will also change the color
+
+00:05:53.160 --> 00:05:55.760
+and print the corresponding exit code.
+
+00:05:55.760 --> 00:05:57.320
+Let me actually show you
+
+00:05:57.320 --> 00:05:59.080
+by modifying the hello recipe
+
+00:05:59.080 --> 00:06:03.600
+and making it exit.
+
+00:06:03.600 --> 00:06:08.400
+As you can see,
+
+00:06:08.400 --> 00:06:10.480
+it clearly indicates the error message now.
+
+00:06:10.480 --> 00:06:12.720
+That is a pretty much
+
+00:06:12.720 --> 00:06:14.240
+a good high level overview
+
+00:06:14.240 --> 00:06:15.680
+of how to execute recipes
+
+00:06:15.680 --> 00:06:17.280
+using this Emacs extension.
+
+00:06:17.280 --> 00:06:21.720
+If I press the h or the ? key,
+
+00:06:21.720 --> 00:06:23.520
+it will display the various ways
+
+00:06:23.520 --> 00:06:24.160
+to drive it.
+
+00:06:24.160 --> 00:06:27.480
+Now as you can see,
+
+00:06:27.480 --> 00:06:29.320
+you can pass various options to it.
+
+00:06:29.320 --> 00:06:31.600
+I find the dry run option effective
+
+00:06:31.600 --> 00:06:34.560
+whenever I have to print the recipe contents
+
+00:06:34.560 --> 00:06:36.600
+without actually executing the recipe.
+
+00:06:36.600 --> 00:06:39.720
+There are also various ways to execute it.
+
+00:06:39.720 --> 00:06:42.960
+You can use Emacs's eshell to execute it
+
+00:06:42.960 --> 00:06:45.040
+by pressing the E keybinding.
+
+00:06:45.040 --> 00:06:48.400
+Let me try executing the hello recipe again,
+
+00:06:48.400 --> 00:06:50.760
+but this time via Emacs's eshell.
+
+00:06:50.760 --> 00:06:54.840
+As you can see now I have an eshell instance
+
+00:06:54.840 --> 00:06:57.320
+where it executed the just hello recipe.
+
+00:06:57.320 --> 00:07:02.440
+You can also directly
+
+00:07:02.440 --> 00:07:03.680
+go to the recipe line
+
+00:07:03.680 --> 00:07:05.000
+by pressing the return key.
+
+00:07:05.000 --> 00:07:08.040
+So let's say if I want to
+
+00:07:08.040 --> 00:07:09.360
+go to the recipe build app
+
+00:07:09.360 --> 00:07:12.160
+all I have to do is press the return key
+
+00:07:12.160 --> 00:07:14.400
+and it will go to the just file
+
+00:07:14.400 --> 00:07:15.520
+with the proper line.
+
+00:07:15.520 --> 00:07:19.800
+You can also re-execute the same recipe
+
+00:07:19.800 --> 00:07:21.320
+from the output just buffer.
+
+00:07:21.320 --> 00:07:23.320
+I find this very helpful
+
+00:07:23.320 --> 00:07:25.080
+when iterating on certain things.
+
+00:07:25.080 --> 00:07:26.720
+In my day job,
+
+00:07:26.720 --> 00:07:29.240
+I often have to work with a Kubernetes cluster,
+
+00:07:29.240 --> 00:07:30.480
+and I would have to write
+
+00:07:30.480 --> 00:07:33.360
+resource manifest files for applications.
+
+00:07:33.360 --> 00:07:36.376
+Having the ability to run the recipes
+
+00:07:36.377 --> 00:07:37.942
+while iterating on the project
+
+00:07:37.943 --> 00:07:39.560
+is very useful, in my opinion.
+
+00:07:39.560 --> 00:07:42.000
+Let me actually show you
+
+00:07:42.000 --> 00:07:43.680
+an example of what I am talking about.
+
+00:07:43.680 --> 00:07:46.680
+Let me run the build app recipe now,
+
+00:07:46.680 --> 00:07:48.400
+which will basically build the manifest
+
+00:07:48.400 --> 00:07:49.600
+and print it out.
+
+00:07:49.600 --> 00:07:58.160
+Now let me open one of the application files.
+
+00:07:58.160 --> 00:07:59.960
+I will open the ingress.yaml file.
+
+00:07:59.960 --> 00:08:06.120
+So I have this YAML file which I am working on,
+
+00:08:06.120 --> 00:08:08.600
+and I also have this output buffer
+
+00:08:08.600 --> 00:08:10.160
+which is basically the output
+
+00:08:10.160 --> 00:08:11.840
+of the build app recipe.
+
+00:08:11.840 --> 00:08:14.200
+Now I can basically go through this buffer
+
+00:08:14.200 --> 00:08:18.320
+and see if everything is alright,
+
+00:08:18.320 --> 00:08:21.760
+but I find out that I didn't want
+
+00:08:21.760 --> 00:08:23.920
+the hostname to be emacs2022.
+
+00:08:23.920 --> 00:08:25.840
+I wanted it to be just emacs.
+
+00:08:25.840 --> 00:08:29.000
+I can go and fix it in my YAML file,
+
+00:08:29.000 --> 00:08:34.160
+and then I can go on
+
+00:08:34.160 --> 00:08:36.160
+to the output buffer
+
+00:08:36.160 --> 00:08:38.520
+and basically just re-run the command
+
+00:08:38.520 --> 00:08:40.080
+by pressing the g key binding.
+
+00:08:40.080 --> 00:08:42.800
+As you can see,
+
+00:08:42.800 --> 00:08:48.160
+it executed the same recipe again,
+
+00:08:48.160 --> 00:08:49.440
+and I can see that
+
+00:08:49.440 --> 00:08:51.280
+the hostname is indeed emacs.
+
+00:08:51.280 --> 00:08:55.000
+I find this kind of workflow very convenient
+
+00:08:55.000 --> 00:08:56.600
+while I am working on a project.
+
+00:08:56.600 --> 00:08:59.320
+Another way of interacting
+
+00:08:59.320 --> 00:09:00.440
+with the justl extension
+
+00:09:00.440 --> 00:09:02.400
+is by using the interactive function
+
+00:09:02.400 --> 00:09:04.280
+justl-exec-recipe-in-dir.
+
+00:09:04.280 --> 00:09:06.040
+The use case of this function
+
+00:09:06.040 --> 00:09:07.840
+is executing a one-off recipe
+
+00:09:07.840 --> 00:09:09.920
+while you are working on something else.
+
+00:09:09.920 --> 00:09:11.960
+Let me show you an example of it.
+
+00:09:11.960 --> 00:09:19.800
+As you can see, it shows me
+
+00:09:19.800 --> 00:09:21.320
+a drop down of various recipes
+
+00:09:21.320 --> 00:09:22.640
+available in the justfile.
+
+00:09:22.640 --> 00:09:24.880
+You can choose any particular one
+
+00:09:24.880 --> 00:09:26.800
+and execute the corresponding recipe.
+
+00:09:26.800 --> 00:09:28.360
+In this case, I will choose
+
+00:09:28.360 --> 00:09:29.640
+the build-app recipe,
+
+00:09:29.640 --> 00:09:31.320
+and we will get the output
+
+00:09:31.320 --> 00:09:32.280
+in the *just* buffer
+
+00:09:32.280 --> 00:09:33.200
+which should be similar
+
+00:09:33.200 --> 00:09:34.680
+to what we saw previously.
+
+00:09:34.680 --> 00:09:43.920
+So this was a quick introduction
+
+00:09:43.920 --> 00:09:45.120
+to what justfile is
+
+00:09:45.120 --> 00:09:46.800
+and how to drive them within Emacs.
+
+00:09:46.800 --> 00:09:48.600
+Hopefully it was helpful
+
+00:09:48.600 --> 00:09:50.160
+and it would encourage you
+
+00:09:50.160 --> 00:09:51.480
+to use justfiles in your workflow.
+
+00:09:51.480 --> 00:09:53.800
+Thank you for allowing me to present.
+
+00:09:53.800 --> 00:09:55.480
+I am available in IRC
+
+00:09:55.480 --> 00:10:02.040
+if you have any questions.
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