path: root/2021/captions/emacsconf-2021-clede--clede-the-common-lisp-emacs-development-environment--fermin-mf--main.vtt

WEBVTT

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hi my name is eduardox i'm the author of

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an mx package called ev and this talk is

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about a new feature of ev called test

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blocks

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let's start by demo

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this is a file in lua that defines these

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two functions here

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and with it if we type f8 several times

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here

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the f8s create a lower apple here and

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then they send these lines to the rebel

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where this line here loads this file

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into the repo and these other lines here

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are tests for these lines

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there's a lot of information here so let

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me organize them in a more visual way

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this is our file in lua

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lua sees this thing as a as a multi-line

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comment but we are going to see it as a

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test block and eev mode is active and so

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f8 does the right thing

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uh these three lines here set up the

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target buffer running a lower apple you

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can see the the prompt of the rebel here

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and these lines here are sent to the

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rebel

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and when we type f8 on the line that

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starts

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with the red star like these lines here

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what if it does is that it sends the

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rest of the line sorry it

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executes the rest of the line as lisp

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so it executes the three effects here

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executes these lines as lisp and they

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set up the target buffer here

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and when we type f8 on the line that

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does not start with the red star

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the f8 sends the line to the target

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buffer and moves down

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and this line loads this file under

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apple and these lines are tests

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so we just saw how to use an existing

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test block let's now see how to create a

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new test block we just have to run this

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meta x e insert test block

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or meta x euat

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and the result depends on the major mode

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uh let's see let's understand that that

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by looking at the source code

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eeit is an alias to this function here

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and this function is just five lines of

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code plus a dot string

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and the dot string explains that if the

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major mode is full mode then this

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function tries to call

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a function called e insert test plot

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test full mode if that function exists

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and that if that function does not exist

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then it yields an error

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and here's an example of one such

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function that's a function that

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inserts a test block in haskell mode

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and here we can see two functions like

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this one for haskell mode and one for

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javascript mode

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uh these functions look quite similar

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but

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their effects look quite different

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to make this comparison here i started

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by writing

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by creating seven files each one in a

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different language

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and initially each one of these files

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only had a comment with the name of the

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language so c haskell javascript org

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mode etc

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and in each one of these files i typed

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meta x eeit to insert the test block

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so here we can see that these test

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blocks are different

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for example the syntax for multi-line

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comments is different depending on the

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language

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uh this block here that selects which

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rebel to run is also different

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this line here that shows how that

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tells the repo to

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load the current file is also different

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depending on the language

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in some cases i had to improvise a bit

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for example

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uh to implement test blocks in shell

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mode i had to use this

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this with syntax using a rear document

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in tcl i also had to improvise a bit and

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in some cases i had to improvise a lot

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for example in org mode there isn't an

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obvious rebel to run and there isn't an

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obvious way to load the

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the current org file into the repo so

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the default action of meta x eeit

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in log mode is just to insert this thing

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here

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that we can use to run a

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shell in a rebel

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so

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these functions are quite similar and in

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the beginning i was writing all of them

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by hand but then i got bored and i wrote

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a function to help you write functions

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like that

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this function is called

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find e-uit-links and it creates a

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temporary buffer

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and the contents of this temporary

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buffer depends on the major mode for

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example if the current mode is python

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mode then running this function here

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creates a temporary buffer that lets me

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write the support for

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test blocks into python mode or rewrite

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the function that supports test blocks

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and python mode

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so if i'm in python mode and i run this

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i get a temporary buffer like this

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in which this thing is my template for

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the function usually this thing is

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totally wrong i have to rewrite to this

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string

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but the rest is right you can see python

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mode here in the name of the function so

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we have to edit this and save that to

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our home

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slash.mx and by the way these things

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here hyperlinks to many different things

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this elias piper link here

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points to the source code to the section

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in which

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these

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functions are defined

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so you can see this here the function

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that supports c

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the function for haskell the function

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for javascript etc

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and that's it this is a five-minute talk

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so i can't say much

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if you want more information or if you

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want to see real world examples how i

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use test blocks etc etc see this page

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here and i do not have time to explain

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this by the way here

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so that's it thanks