path: root/2020/subtitles/emacsconf-2020--34-extend-emacs-to-modern-gui-applications-with-eaf--matthew-zeng-autogen.vtt

WEBVTT

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hello

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hopefully everyone is staying safe and

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staying home

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I feel very grateful to live in a world

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today that technology and free software

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can be leveraged to connect people in

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such disconnected and difficult times

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and to have an online conference like

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this hopefully you've all

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enjoyed this year's Emacs con so far

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many thanks to all the people that made

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this possible

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anyways welcome to my talk extend Emacs

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to modern gui

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applications with eaf the imax

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application framework

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this will be my first ever talk so

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apologies for my

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inexperience let us begin

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about me my name is matthew zing you can

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also call me mt

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or mindu I'm a chinese canadian living

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in toronto

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ontario offline I'm an undergrad

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studying mathematics at the university

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of urudu

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online I mean one of the admins of the

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Emacs china

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the largest Emacs forum in china so

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to all chinese listen to my talk right

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now feel free to check it out

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and this is a link to my github profile

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to my projects I'm involving one's me

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max which is

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I'm the author of a user-friendly

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full-featured image configuration

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distribution

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it is what I'm using right now as well

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as the imax application filter

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which I help to maintain along with the

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other other

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lazy cat which of course is today's

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topic

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so as you might all might have already

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noticed I'm currently using Emacs

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and oh and opening navigating closing

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all these websites that are rendered

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properly

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or within Emacs it's all thanks to the

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ef project

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so we're living in a society that's

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heavily dependent on the internet

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and multimedia it is unavoidable to run

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to some occasion that you need to

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open a fancy website that uses

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javascript and css

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or you need to watch some videos however

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due to the nature and history of Emacs

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it cannot

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render all these modern graphics

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effectively and efficiently

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Emacs is solely a text-based editing

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environment

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and I argue that this is not a bad thing

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in fact it is one of the reasons that me

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and I believe many of you as well

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are attracted to Emacs in the first

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place

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unfortunately this results in us having

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to open a dedicated web browser to

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browse the internet

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open a dedicated video player to watch

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some videos or a pdf render to read some

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documents

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so far ems cannot do all these tasks on

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its own

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but can only be achieved using other

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external applications

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so the other the author manatee lazy cat

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or lazy cat in short didn't want to use

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all these external applications

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he wanted to have an uninterrupted e-max

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experience

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he wanted to truly live in e-max

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however it would be a lot of work to

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build this

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modern application from scratch there's

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simply no time or research to do that

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so lazy car without utilizing existing

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applications

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and to try to make it collaborate with

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Emacs there are many solutions available

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one of it

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is the e-max x windows manager and I'm

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sure a lot of you already know that

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the exwm however it didn't work for him

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because although ux doubling opens the

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door to use other applications within

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Emacs

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it as a fine window manager cannot

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modify

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customize or extend other software from

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Emacs

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for example it cannot modify the

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behavior when you press a key in

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chromium or

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pdf viewer therefore it cannot utilize

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the rich emax ecosystem that's been

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growing for almost 40 years

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on the other hand in the ef browser so

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if you mx ef open

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browser with history you can see

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on the lower half of my screen a list of

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histories sorted by my personal

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most visited sites and you can search

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for a site that you've been

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into or search for some keyword and in a

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search engine

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so this is all achieved by utilizing the

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popular completion framework in the

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Emacs ecosystem

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so this car decided to develop a

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solution of its own in 2018

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namely the eaf project so I joined the

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development last year

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2019 ef is

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a highly customizable and extensible

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reapplication framework that extends

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imax to graphical capabilities using pi

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qd5 and it is not a window manager

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alright so in the readme you can see a

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list of gifs

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showcasing all the available ef

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applications

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a browser a markdown premier a video

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player

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a pdf viewer and more today I don't have

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enough time to demonstrate each one of

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them

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but I will select a couple applications

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to show you

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so since we are already using ef browser

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we'll start with this besides using the

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classic control n control p

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you can also use the vim style xjkl to

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move up or down

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also meta shift comma or g to the

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beginning of page

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when that shift period or capital g to

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the end of page

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limiting and surfing keys linear and

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surfing keys are popular keyboard-based

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browsing techniques in chrome

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and they've imported here as well you

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can press f to toggle markers pointing

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to

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all the links in the current page say I

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want to visit the wiki

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which comes very very handy when you

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want to configure ef to your liking

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so you see the marker on top of wiki is

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dd

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press dd and you enter and now

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you will navigate it to this link so you

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don't need to use your mouse at all

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so a full list of key bindings can be

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found when you

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control hm just as any other max major

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mode

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so you don't have to remember everything

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all the key bindings I said to you

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so this is a global binding application

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to every other ef application as well

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so you can find it under the week or or

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you can find it under the wiki in the

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key binding

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section so press f again and use

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ns press enter now you're in the key

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binding web page

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you can see all of the key buttons

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available in every

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es application and you can try them out

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and you can customize your key bindings

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using ef

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bank key you can customize control n as

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in the web page to

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to scroll up in the ef pdf viewer or you

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can unbind

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an existing binding using using yet bank

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key

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binder to new so it doesn't bind to

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anything

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okay so here comes the important part

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if you want to customize ef you should

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visit the customization page in the wiki

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so now I press meta b to go back in

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history and

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go to the customization package press f

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press a d

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enter and now we're in the customization

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page

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so the first customization option you

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see is dark mode

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let's say if you want to turn on the doc

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mode for ef browser

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and you don't want to use your mouse to

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do all this stuff

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you press c and you can select

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c to toggle the correct browsing you can

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see a lot of markers available

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pop um again but they're not they're not

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on top of links but instead of

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paragraphs

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you select the paragraph or your choice

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in this case you want

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ls which comes here

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and then you just you just move the

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cursor like what you always do

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in Emacs and now you select everything

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and use meta w to

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excuse me metadata to copy the taste the

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text

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now we made a shift column to evaluate

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what we just copied

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and set that to true and

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press r or f5 to refresh the page

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voila we have the dark mode enabled

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so there are well let's take a toggle

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back off for now

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now we made our shift column again

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and we find the the one we just used and

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change it back to false

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and refresh the page back in the light

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mode

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so there are many other customization

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options available you can either

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evaluate like what we just did or add it

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to your Emacs configuration file

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so in this wiki you can have you can

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you can make the ef browser to to

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continue where you left off

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similar to the chromium setting

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and you can make yes the default browser

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Emacs by

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aliasing aliasing browse web to your

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open browser

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or or set the browse url browser

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function to

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open browser there's just some tricks

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and there are also

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uh an experimental app blocker currently

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take in place and so therefore it can

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block some elements but not all so

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we we really encourage people to help us

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test out and

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add more conditions in

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so you can so the ef browser is able to

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download

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any files from the internet and it will

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be downloaded using

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a area too and

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you can also customize the ef browser

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download path

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using ef set so it's a function that we

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defined similar to set the normal set we

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know

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so by default the download file is

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stored in your home directory slash

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downloads

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and you can change that whenever you

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want you can also disable

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saving browsing history so remember

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when I press when I use mx you have open

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browser's history I see all the

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histories here but if you want more

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privacy you don't want that to be

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available at all you can turn it off

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easily with ef

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set queue and set that remember history

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to false

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you can also say your default search

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engine so

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so right now we have google although

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not not really good but google and also

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go which is a better search engine

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well uh yeah ethically better search

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engine

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so you can also configure

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the zoom so the default zoom of your

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browser is 1.0 so you can convert

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convert 3000 to 1.25 so you can so when

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you open any web page about it will be

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zoomed

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by default uh you can

00:11:17.360 --> 00:11:20.399
also disable javascript although I

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personally don't really suggest you to

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do because it will

00:11:23.440 --> 00:11:26.240
basically break a lot of our features

00:11:26.240 --> 00:11:28.480
because a lot of the browser browser

00:11:28.480 --> 00:11:29.519
related features

00:11:29.519 --> 00:11:33.760
must be implemented using javascript

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but yeah you can do it if you really

00:11:35.440 --> 00:11:37.920
want to and there also some

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customization on ef camera

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you can do as well yeah

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so uh let's move on to efpd viewer

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so now now let's open

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the pdf file using af

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so that's one something already here but

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let's open it here

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so yes open and

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select introduction to programming in

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e-max list

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uh I have it already open but it's okay

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so you have the file

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you have other files displayed

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you have all the pages display story yes

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and

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there are 273 pages in total but notice

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like how fast it is to browse

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all the pages it is blazingly fast

00:12:31.440 --> 00:12:33.519
that's all thanks to python and

00:12:33.519 --> 00:12:37.040
mupdf which you don't really get from

00:12:37.040 --> 00:12:40.880
Emacs list

00:12:40.880 --> 00:12:43.600
so let's say if I want to jump to page

00:12:43.600 --> 00:12:44.079
50

00:12:44.079 --> 00:12:48.639
we press p and enter 50.

00:12:48.639 --> 00:12:53.279
50 and here we are we are at page 50.

00:12:53.279 --> 00:12:55.440
you can look at the lower right to

00:12:55.440 --> 00:12:58.880
verify the page you're on

00:12:58.880 --> 00:13:02.079
and you can you can

00:13:02.079 --> 00:13:05.120
use I to toggle dark mode

00:13:05.120 --> 00:13:07.839
as expected and let's say you want to

00:13:07.839 --> 00:13:08.240
find

00:13:08.240 --> 00:13:11.519
table of contents so use ctrl s

00:13:11.519 --> 00:13:15.680
the image default binding for I search

00:13:15.680 --> 00:13:19.360
and search for a table of contents

00:13:19.360 --> 00:13:21.680
here we are it is highlighted for you

00:13:21.680 --> 00:13:23.120
and you can control s for more but

00:13:23.120 --> 00:13:24.240
there's only one or

00:13:24.240 --> 00:13:27.200
one match one other one you ctrl g to

00:13:27.200 --> 00:13:28.800
disable the highlight

00:13:28.800 --> 00:13:30.880
and you see a lot of options for you to

00:13:30.880 --> 00:13:32.320
go

00:13:32.320 --> 00:13:35.040
okay let's say if you want to go to the

00:13:35.040 --> 00:13:36.240
preface

00:13:36.240 --> 00:13:39.519
so that is you press f which which is

00:13:39.519 --> 00:13:40.639
also similar to

00:13:40.639 --> 00:13:44.240
eef browser you press f for vimeo

00:13:44.240 --> 00:13:47.760
and you see the marker now change to w

00:13:47.760 --> 00:13:50.160
press wn and then you can go to the

00:13:50.160 --> 00:13:51.279
prefix

00:13:51.279 --> 00:13:54.320
now we'll add a prefix

00:13:54.320 --> 00:13:56.480
so now you finish reading you want to

00:13:56.480 --> 00:13:57.600
save your progress

00:13:57.600 --> 00:13:59.440
no worries it is already saved for you

00:13:59.440 --> 00:14:01.199
by ef you can safely

00:14:01.199 --> 00:14:04.240
close the document using x

00:14:04.240 --> 00:14:07.519
and opening again af

00:14:07.519 --> 00:14:10.560
open and the file see your I

00:14:10.560 --> 00:14:14.000
preface again so you're right at where

00:14:14.000 --> 00:14:16.560
you let up left up

00:14:16.560 --> 00:14:19.440
you can also use mx org store link or

00:14:19.440 --> 00:14:20.480
ctrl cl

00:14:20.480 --> 00:14:23.279
which I prefer to if you want to save a

00:14:23.279 --> 00:14:24.480
particular page in

00:14:24.480 --> 00:14:28.240
a orgmo file so now

00:14:28.240 --> 00:14:30.320
I go back to my presentation now I don't

00:14:30.320 --> 00:14:31.760
need this anymore

00:14:31.760 --> 00:14:35.600
uh so you just control c control l

00:14:35.600 --> 00:14:39.120
or I think mx or insert link

00:14:39.120 --> 00:14:41.040
so you can find the file right here and

00:14:41.040 --> 00:14:42.399
you press enter

00:14:42.399 --> 00:14:44.320
and you press enter for the description

00:14:44.320 --> 00:14:46.480
again and now it's right here

00:14:46.480 --> 00:14:50.720
and ctrl c ctrl o to open it voila

00:14:50.720 --> 00:14:54.000
you're back right so

00:14:54.000 --> 00:14:57.120
let's now demonstrate the ef video

00:14:57.120 --> 00:14:58.880
player

00:14:58.880 --> 00:15:02.639
so mxef open if you use ef open whenever

00:15:02.639 --> 00:15:03.279
you want to

00:15:03.279 --> 00:15:06.079
open some file you use yet open browser

00:15:06.079 --> 00:15:07.279
if you want to use some

00:15:07.279 --> 00:15:09.920
actual application that's not really

00:15:09.920 --> 00:15:11.199
related to a file

00:15:11.199 --> 00:15:14.800
so you have open and select the video

00:15:14.800 --> 00:15:15.600
you want so

00:15:15.600 --> 00:15:18.320
video demo so I already have a video

00:15:18.320 --> 00:15:19.040
demo

00:15:19.040 --> 00:15:21.839
ready so because I recorded a video of

00:15:21.839 --> 00:15:22.720
the demo

00:15:22.720 --> 00:15:26.000
of the ef camera have a look so

00:15:26.000 --> 00:15:28.079
let's move to the beginning hello people

00:15:28.079 --> 00:15:29.279
from the future

00:15:29.279 --> 00:15:32.399
this is a demo of the ef video player

00:15:32.399 --> 00:15:35.199
that demos the ef camera feature

00:15:35.199 --> 00:15:37.440
so as you can see on the screen of me

00:15:37.440 --> 00:15:38.639
inside my camera

00:15:38.639 --> 00:15:40.959
and the screen is actually with all

00:15:40.959 --> 00:15:42.880
within Emacs

00:15:42.880 --> 00:15:46.079
right so and you can open this

00:15:46.079 --> 00:15:49.839
using here open camera

00:15:49.839 --> 00:15:53.040
and which I'm already into and you can

00:15:53.040 --> 00:15:53.600
press

00:15:53.600 --> 00:15:56.720
p to capture a photo

00:15:56.720 --> 00:15:59.680
so the photo is by default stored at

00:15:59.680 --> 00:16:00.880
your home slash

00:16:00.880 --> 00:16:03.920
downloads directory and you can modify

00:16:03.920 --> 00:16:04.320
it

00:16:04.320 --> 00:16:07.839
freely so if you go here and you can see

00:16:07.839 --> 00:16:09.519
the camera stored

00:16:09.519 --> 00:16:13.759
right here so why what I used here

00:16:13.759 --> 00:16:16.240
so you press space to pause what I used

00:16:16.240 --> 00:16:17.120
here is

00:16:17.120 --> 00:16:20.320
the year so ef open this entire so

00:16:20.320 --> 00:16:22.959
basically so in direct you you go to you

00:16:22.959 --> 00:16:23.839
you select

00:16:23.839 --> 00:16:26.959
the file that should be opened by

00:16:26.959 --> 00:16:30.320
eaf and I use that so it it detects that

00:16:30.320 --> 00:16:32.720
it wants to use the ef image viewer so

00:16:32.720 --> 00:16:35.839
I accidentally tested if image viewer

00:16:35.839 --> 00:16:39.759
before I noticed so that that that gives

00:16:39.759 --> 00:16:40.240
the

00:16:40.240 --> 00:16:43.680
image of the photo I just took

00:16:43.680 --> 00:16:47.040
using ef camera and as you can see you

00:16:47.040 --> 00:16:47.360
can

00:16:47.360 --> 00:16:50.720
I can use hl the bim button to navigate

00:16:50.720 --> 00:16:51.600
in the time

00:16:51.600 --> 00:16:55.920
timestamp in the video and I can use

00:16:55.920 --> 00:17:02.320
jk to to change the volumes of the video

00:17:02.320 --> 00:17:05.520
alright so now you've seen all the basic

00:17:05.520 --> 00:17:06.160
usages

00:17:06.160 --> 00:17:08.720
of the ef project it comes the question

00:17:08.720 --> 00:17:11.600
of what is the magic behind it

00:17:11.600 --> 00:17:14.559
all right let's open the hacking page in

00:17:14.559 --> 00:17:15.919
the wiki

00:17:15.919 --> 00:17:20.400
the design is laid out in a diagram here

00:17:20.400 --> 00:17:25.120
so and let's put it

00:17:25.120 --> 00:17:27.839
side by side along with my text so you

00:17:27.839 --> 00:17:28.160
can

00:17:28.160 --> 00:17:32.320
go we can follow through

00:17:32.320 --> 00:17:36.080
right okay let me

00:17:36.080 --> 00:17:42.320
sorry let me drink some water

00:17:42.320 --> 00:17:46.000
so this page in the wiki went into a lot

00:17:46.000 --> 00:17:48.160
of detail

00:17:48.160 --> 00:17:49.520
due to the time constraint I will just

00:17:49.520 --> 00:17:51.679
rephrase some of the ideas here so for

00:17:51.679 --> 00:17:53.520
anyone interested please have a look at

00:17:53.520 --> 00:17:55.600
the wiki yourself

00:17:55.600 --> 00:17:58.160
the easiest way to think about eaf is

00:17:58.160 --> 00:17:58.720
that

00:17:58.720 --> 00:18:01.679
the actual gui application is started in

00:18:01.679 --> 00:18:02.960
the background

00:18:02.960 --> 00:18:04.960
then the frame of the application is

00:18:04.960 --> 00:18:07.120
attached to the appropriate location on

00:18:07.120 --> 00:18:07.679
the

00:18:07.679 --> 00:18:10.720
Emacs window so

00:18:10.720 --> 00:18:13.440
you have linked qt5 with Emacs using

00:18:13.440 --> 00:18:14.960
list and python

00:18:14.960 --> 00:18:17.120
of the python site which is colored

00:18:17.120 --> 00:18:18.640
yellow in the image

00:18:18.640 --> 00:18:20.559
you have two graphics view and queue

00:18:20.559 --> 00:18:22.960
graphics scene objects

00:18:22.960 --> 00:18:25.039
these are used to simulate the e-max

00:18:25.039 --> 00:18:26.640
window buffer design

00:18:26.640 --> 00:18:28.640
where q graphics scene is similar to

00:18:28.640 --> 00:18:29.840
buffers in Emacs

00:18:29.840 --> 00:18:31.840
it controls the state and the content

00:18:31.840 --> 00:18:34.240
details of the application

00:18:34.240 --> 00:18:39.039
well q graphics view is similar to

00:18:39.039 --> 00:18:41.200
geographic view is similar to imax

00:18:41.200 --> 00:18:43.200
window it populates the buffer

00:18:43.200 --> 00:18:45.919
to graphics scene to the full program at

00:18:45.919 --> 00:18:46.960
the appropriate

00:18:46.960 --> 00:18:50.320
position whenever an ef mode buffer

00:18:50.320 --> 00:18:57.679
brings to a background

00:18:57.679 --> 00:18:59.679
whenever an ef mode buffer brings to the

00:18:59.679 --> 00:19:00.880
foreground sorry

00:19:00.880 --> 00:19:02.559
a queue graphics view instance is

00:19:02.559 --> 00:19:05.120
created and whenever the buffer goes to

00:19:05.120 --> 00:19:06.080
the background

00:19:06.080 --> 00:19:08.000
the q graphics view instance is then

00:19:08.000 --> 00:19:09.120
deleted

00:19:09.120 --> 00:19:10.960
while q graphics scene the actual

00:19:10.960 --> 00:19:12.480
process remains running in the

00:19:12.480 --> 00:19:14.480
background until the ef mode buffer is

00:19:14.480 --> 00:19:16.000
killed

00:19:16.000 --> 00:19:18.320
gpa compositing is used to ensure that q

00:19:18.320 --> 00:19:19.440
graphics view and

00:19:19.440 --> 00:19:21.840
graphics sync is synchronized real time

00:19:21.840 --> 00:19:24.000
using q windows set parent function

00:19:24.000 --> 00:19:25.679
the queue graphics view is attached to

00:19:25.679 --> 00:19:27.840
appropriate location on the e-max frame

00:19:27.840 --> 00:19:30.640
so that although great applications are

00:19:30.640 --> 00:19:32.400
not running within e-max

00:19:32.400 --> 00:19:36.160
they look as if they were

00:19:36.160 --> 00:19:39.039
so when user types on the keyboard it is

00:19:39.039 --> 00:19:41.039
first received by the Emacs ef

00:19:41.039 --> 00:19:43.520
ef mode buffer and then it lifts sends

00:19:43.520 --> 00:19:45.360
the event to google graphics sync using

00:19:45.360 --> 00:19:46.240
dbus

00:19:46.240 --> 00:19:48.720
when user clicks on the gui application

00:19:48.720 --> 00:19:50.400
it is received by the queue graphics

00:19:50.400 --> 00:19:50.799
view

00:19:50.799 --> 00:19:53.280
and process in python ellipse can

00:19:53.280 --> 00:19:55.200
communicate with python through dbus

00:19:55.200 --> 00:19:59.200
in other words in other words you can

00:19:59.200 --> 00:20:01.360
customize and extend Emacs not just

00:20:01.360 --> 00:20:01.760
using

00:20:01.760 --> 00:20:04.480
lisp and now you can use python this way

00:20:04.480 --> 00:20:05.360
one can leverage

00:20:05.360 --> 00:20:07.039
all the python properties like

00:20:07.039 --> 00:20:09.600
multi-threading or some other stuff

00:20:09.600 --> 00:20:11.679
the entire python ecosystem can be

00:20:11.679 --> 00:20:13.520
utilized as well

00:20:13.520 --> 00:20:16.159
such as the qt web engine that is the

00:20:16.159 --> 00:20:16.960
basis for

00:20:16.960 --> 00:20:20.640
our eef browser and pi mu pdf is the

00:20:20.640 --> 00:20:23.360
basis for the ef pdf viewer

00:20:23.360 --> 00:20:25.840
so this really opens the window to many

00:20:25.840 --> 00:20:28.240
many new possibilities to extend Emacs

00:20:28.240 --> 00:20:32.720
using eaf

00:20:32.720 --> 00:20:36.080
all right back here we are always

00:20:36.080 --> 00:20:37.760
looking for people to join the

00:20:37.760 --> 00:20:39.679
development there are many many

00:20:39.679 --> 00:20:42.720
more work that needs to be done like

00:20:42.720 --> 00:20:44.640
such as testing and debug if there are

00:20:44.640 --> 00:20:46.640
more linux distros and window managers

00:20:46.640 --> 00:20:47.760
such as i3

00:20:47.760 --> 00:20:51.200
and stuff I mean you can also add new ef

00:20:51.200 --> 00:20:52.080
applications

00:20:52.080 --> 00:20:54.240
or debug and enhance existing af

00:20:54.240 --> 00:20:55.440
applications

00:20:55.440 --> 00:20:58.000
or you can port ef to native wayland

00:20:58.000 --> 00:21:00.240
which I just discussed with the

00:21:00.240 --> 00:21:03.840
the ems whip kit author uh a kill

00:21:03.840 --> 00:21:07.919
akira tile and she he told me that like

00:21:07.919 --> 00:21:10.159
really like it must really yeah it

00:21:10.159 --> 00:21:11.200
doesn't really work

00:21:11.200 --> 00:21:14.320
um native villain because it uses

00:21:14.320 --> 00:21:16.799
x valence so it doesn't work on the pgdk

00:21:16.799 --> 00:21:18.159
port of Emacs

00:21:18.159 --> 00:21:20.559
so and we also need people to pour ef to

00:21:20.559 --> 00:21:22.080
non-free operating systems

00:21:22.080 --> 00:21:25.600
including windows and mac os

00:21:25.600 --> 00:21:28.480
and that's because like debug is a linux

00:21:28.480 --> 00:21:30.080
specific feature so it doesn't really

00:21:30.080 --> 00:21:31.360
work on other platform

00:21:31.360 --> 00:21:33.039
we need to change replace it with some

00:21:33.039 --> 00:21:34.640
alternative and

00:21:34.640 --> 00:21:36.720
geographic scene somehow doesn't really

00:21:36.720 --> 00:21:38.640
work on mac os

00:21:38.640 --> 00:21:40.320
and there are many other to-do lists

00:21:40.320 --> 00:21:42.880
available so please have a look

00:21:42.880 --> 00:21:45.039
if and see it's anything you want to

00:21:45.039 --> 00:21:46.640
work on

00:21:46.640 --> 00:21:49.039
all right so since this is a

00:21:49.039 --> 00:21:51.120
pre-recorded talk I won't be able to do

00:21:51.120 --> 00:21:53.520
the q a real time in the video

00:21:53.520 --> 00:21:56.080
however I will be around on the

00:21:56.080 --> 00:21:57.200
collaborate pad

00:21:57.200 --> 00:22:00.559
and the irc imax con you must come

00:22:00.559 --> 00:22:01.360
questions

00:22:01.360 --> 00:22:04.240
to answer any questions it pops up and

00:22:04.240 --> 00:22:05.760
you can also submit an issue

00:22:05.760 --> 00:22:09.120
on the repo and you can check the wiki

00:22:09.120 --> 00:22:12.640
for some other guides and tricks

00:22:12.640 --> 00:22:15.039
all right thank you guys and hopefully

00:22:15.039 --> 00:22:16.000
you find the

00:22:16.000 --> 00:22:18.320
this year project very interesting and

00:22:18.320 --> 00:22:24.320
enjoy the rest of Emacs com 2020