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

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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

0:10:53.600,0:10:59.360
well uh yeah ethically better search

0:10:57.360,0:11:02.560
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

0:11:17.360,0:11:22.240
also disable javascript although i

0:11:20.399,0:11:23.440
personally don't really suggest you to

0:11:22.240,0:11:26.240
do because it will

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basically break a lot of our features

0:11:26.240,0:11:29.519
because a lot of the browser browser

0:11:28.480,0:11:33.600
related features

0:11:29.519,0:11:33.600
must be implemented using javascript

0:11:33.760,0:11:37.920
but yeah you can do it if you really

0:11:35.440,0:11:41.519
want to and there also some

0:11:37.920,0:11:45.519
customization on ef camera

0:11:41.519,0:11:45.519
you can do as well yeah

0:11:47.760,0:11:56.079
so uh let's move on to efpd viewer

0:11:52.399,0:11:59.440
so now now let's open

0:11:56.079,0:12:01.519
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

0:12:13.760,0:12:16.800
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

0:12:27.040,0:12:31.440
like how fast it is to browse

0:12:29.279,0:12:33.519
all the pages it is blazingly fast

0:12:31.440,0:12:37.040
that's all thanks to python and

0:12:33.519,0:12:39.839
mupdf which you don't really get from

0:12:37.040,0:12:39.839
emacs list

0:12:40.880,0:12:44.079
so let's say if i want to jump to page

0:12:43.600,0:12:48.320
50

0:12:44.079,0:12:48.320
we press p and enter 50.

0:12:48.639,0:12:55.440
50 and here we are we are at page 50.

0:12:53.279,0:12:58.880
you can look at the lower right to

0:12:55.440,0:13:02.079
verify the page you're on

0:12:58.880,0:13:05.120
and you can you can

0:13:02.079,0:13:07.839
use i to toggle dark mode

0:13:05.120,0:13:08.240
as expected and let's say you want to

0:13:07.839,0:13:11.519
find

0:13:08.240,0:13:15.680
table of contents so use ctrl s

0:13:11.519,0:13:19.360
the image default binding for i search

0:13:15.680,0:13:21.680
and search for a table of contents

0:13:19.360,0:13:23.120
here we are it is highlighted for you

0:13:21.680,0:13:24.240
and you can control s for more but

0:13:23.120,0:13:27.200
there's only one or

0:13:24.240,0:13:28.800
one match one other one you ctrl g to

0:13:27.200,0:13:30.880
disable the highlight

0:13:28.800,0:13:32.320
and you see a lot of options for you to

0:13:30.880,0:13:35.040
go

0:13:32.320,0:13:36.240
okay let's say if you want to go to the

0:13:35.040,0:13:39.519
preface

0:13:36.240,0:13:40.639
so that is you press f which which is

0:13:39.519,0:13:44.240
also similar to

0:13:40.639,0:13:47.760
eef browser you press f for vimeo

0:13:44.240,0:13:50.160
and you see the marker now change to w

0:13:47.760,0:13:51.279
press wn and then you can go to the

0:13:50.160,0:13:54.320
prefix

0:13:51.279,0:13:56.480
now we'll add a prefix

0:13:54.320,0:13:57.600
so now you finish reading you want to

0:13:56.480,0:13:59.440
save your progress

0:13:57.600,0:14:01.199
no worries it is already saved for you

0:13:59.440,0:14:04.240
by ef you can safely

0:14:01.199,0:14:07.519
close the document using x

0:14:04.240,0:14:10.560
and opening again af

0:14:07.519,0:14:14.000
open and the file see your i

0:14:10.560,0:14:16.560
preface again so you're right at where

0:14:14.000,0:14:19.440
you let up left up

0:14:16.560,0:14:20.480
you can also use mx org store link or

0:14:19.440,0:14:23.279
ctrl cl

0:14:20.480,0:14:24.480
which i prefer to if you want to save a

0:14:23.279,0:14:28.240
particular page in

0:14:24.480,0:14:30.320
a orgmo file so now

0:14:28.240,0:14:31.760
i go back to my presentation now i don't

0:14:30.320,0:14:35.600
need this anymore

0:14:31.760,0:14:39.120
uh so you just control c control l

0:14:35.600,0:14:41.040
or i think mx or insert link

0:14:39.120,0:14:42.399
so you can find the file right here and

0:14:41.040,0:14:44.320
you press enter

0:14:42.399,0:14:46.480
and you press enter for the description

0:14:44.320,0:14:50.720
again and now it's right here

0:14:46.480,0:14:54.000
and ctrl c ctrl o to open it voila

0:14:50.720,0:14:57.120
you're back right so

0:14:54.000,0:14:58.880
let's now demonstrate the ef video

0:14:57.120,0:15:02.639
player

0:14:58.880,0:15:03.279
so mxef open if you use ef open whenever

0:15:02.639,0:15:06.079
you want to

0:15:03.279,0:15:07.279
open some file you use yet open browser

0:15:06.079,0:15:09.920
if you want to use some

0:15:07.279,0:15:11.199
actual application that's not really

0:15:09.920,0:15:14.800
related to a file

0:15:11.199,0:15:15.600
so you have open and select the video

0:15:14.800,0:15:18.320
you want so

0:15:15.600,0:15:19.040
video demo so i already have a video

0:15:18.320,0:15:21.839
demo

0:15:19.040,0:15:22.720
ready so because i recorded a video of

0:15:21.839,0:15:26.000
the demo

0:15:22.720,0:15:28.079
of the ef camera have a look so

0:15:26.000,0:15:29.279
let's move to the beginning hello people

0:15:28.079,0:15:32.399
from the future

0:15:29.279,0:15:35.199
this is a demo of the ef video player

0:15:32.399,0:15:37.440
that demos the ef camera feature

0:15:35.199,0:15:38.639
so as you can see on the screen of me

0:15:37.440,0:15:40.959
inside my camera

0:15:38.639,0:15:42.880
and the screen is actually with all

0:15:40.959,0:15:46.079
within emacs

0:15:42.880,0:15:49.839
right so and you can open this

0:15:46.079,0:15:53.040
using here open camera

0:15:49.839,0:15:53.600
and which i'm already into and you can

0:15:53.040,0:15:56.720
press

0:15:53.600,0:15:59.680
p to capture a photo

0:15:56.720,0:16:00.880
so the photo is by default stored at

0:15:59.680,0:16:03.920
your home slash

0:16:00.880,0:16:04.320
downloads directory and you can modify

0:16:03.920,0:16:07.839
it

0:16:04.320,0:16:09.519
freely so if you go here and you can see

0:16:07.839,0:16:13.759
the camera stored

0:16:09.519,0:16:16.240
right here so why what i used here

0:16:13.759,0:16:17.120
so you press space to pause what i used

0:16:16.240,0:16:20.320
here is

0:16:17.120,0:16:22.959
the year so ef open this entire so

0:16:20.320,0:16:23.839
basically so in direct you you go to you

0:16:22.959,0:16:26.959
you select

0:16:23.839,0:16:30.320
the file that should be opened by

0:16:26.959,0:16:32.720
eaf and i use that so it it detects that

0:16:30.320,0:16:35.839
it wants to use the ef image viewer so

0:16:32.720,0:16:39.759
i accidentally tested if image viewer

0:16:35.839,0:16:40.240
before i noticed so that that that gives

0:16:39.759,0:16:43.680
the

0:16:40.240,0:16:47.040
image of the photo i just took

0:16:43.680,0:16:47.360
using ef camera and as you can see you

0:16:47.040,0:16:50.720
can

0:16:47.360,0:16:51.600
i can use hl the bim button to navigate

0:16:50.720,0:16:55.920
in the time

0:16:51.600,0:17:00.880
timestamp in the video and i can use

0:16:55.920,0:17:00.880
jk to to change the volumes of the video

0:17:02.320,0:17:06.160
alright so now you've seen all the basic

0:17:05.520,0:17:08.720
usages

0:17:06.160,0:17:11.600
of the ef project it comes the question

0:17:08.720,0:17:14.559
of what is the magic behind it

0:17:11.600,0:17:15.919
all right let's open the hacking page in

0:17:14.559,0:17:20.400
the wiki

0:17:15.919,0:17:24.799
the design is laid out in a diagram here

0:17:20.400,0:17:24.799
so and let's put it

0:17:25.120,0:17:28.160
side by side along with my text so you

0:17:27.839,0:17:32.320
can

0:17:28.160,0:17:36.080
go we can follow through

0:17:32.320,0:17:39.440
right okay let me

0:17:36.080,0:17:39.440
sorry let me drink some water

0:17:42.320,0:17:48.160
so this page in the wiki went into a lot

0:17:46.000,0:17:49.520
of detail

0:17:48.160,0:17:51.679
due to the time constraint i will just

0:17:49.520,0:17:53.520
rephrase some of the ideas here so for

0:17:51.679,0:17:55.600
anyone interested please have a look at

0:17:53.520,0:17:58.160
the wiki yourself

0:17:55.600,0:17:58.720
the easiest way to think about eaf is

0:17:58.160,0:18:01.679
that

0:17:58.720,0:18:02.960
the actual gui application is started in

0:18:01.679,0:18:04.960
the background

0:18:02.960,0:18:07.120
then the frame of the application is

0:18:04.960,0:18:07.679
attached to the appropriate location on

0:18:07.120,0:18:10.720
the

0:18:07.679,0:18:13.440
emacs window so

0:18:10.720,0:18:14.960
you have linked qt5 with emacs using

0:18:13.440,0:18:17.120
list and python

0:18:14.960,0:18:18.640
of the python site which is colored

0:18:17.120,0:18:20.559
yellow in the image

0:18:18.640,0:18:22.960
you have two graphics view and queue

0:18:20.559,0:18:25.039
graphics scene objects

0:18:22.960,0:18:26.640
these are used to simulate the e-max

0:18:25.039,0:18:28.640
window buffer design

0:18:26.640,0:18:29.840
where q graphics scene is similar to

0:18:28.640,0:18:31.840
buffers in emacs

0:18:29.840,0:18:34.240
it controls the state and the content

0:18:31.840,0:18:38.880
details of the application

0:18:34.240,0:18:38.880
well q graphics view is similar to

0:18:39.039,0:18:43.200
geographic view is similar to imax

0:18:41.200,0:18:45.919
window it populates the buffer

0:18:43.200,0:18:46.960
to graphics scene to the full program at

0:18:45.919,0:18:50.320
the appropriate

0:18:46.960,0:18:57.679
position whenever an ef mode buffer

0:18:50.320,0:18:59.679
brings to a background

0:18:57.679,0:19:00.880
whenever an ef mode buffer brings to the

0:18:59.679,0:19:02.559
foreground sorry

0:19:00.880,0:19:05.120
a queue graphics view instance is

0:19:02.559,0:19:06.080
created and whenever the buffer goes to

0:19:05.120,0:19:08.000
the background

0:19:06.080,0:19:09.120
the q graphics view instance is then

0:19:08.000,0:19:10.960
deleted

0:19:09.120,0:19:12.480
while q graphics scene the actual

0:19:10.960,0:19:14.480
process remains running in the

0:19:12.480,0:19:16.000
background until the ef mode buffer is

0:19:14.480,0:19:18.320
killed

0:19:16.000,0:19:19.440
gpa compositing is used to ensure that q

0:19:18.320,0:19:21.840
graphics view and

0:19:19.440,0:19:24.000
graphics sync is synchronized real time

0:19:21.840,0:19:25.679
using q windows set parent function

0:19:24.000,0:19:27.840
the queue graphics view is attached to

0:19:25.679,0:19:30.640
appropriate location on the e-max frame

0:19:27.840,0:19:32.400
so that although great applications are

0:19:30.640,0:19:35.760
not running within e-max

0:19:32.400,0:19:35.760
they look as if they were

0:19:36.160,0:19:41.039
so when user types on the keyboard it is

0:19:39.039,0:19:43.520
first received by the emacs ef

0:19:41.039,0:19:45.360
ef mode buffer and then it lifts sends

0:19:43.520,0:19:46.240
the event to google graphics sync using

0:19:45.360,0:19:48.720
dbus

0:19:46.240,0:19:50.400
when user clicks on the gui application

0:19:48.720,0:19:50.799
it is received by the queue graphics

0:19:50.400,0:19:53.280
view

0:19:50.799,0:19:55.200
and process in python ellipse can

0:19:53.280,0:19:59.200
communicate with python through dbus

0:19:55.200,0:20:01.360
in other words in other words you can

0:19:59.200,0:20:01.760
customize and extend emacs not just

0:20:01.360,0:20:04.480
using

0:20:01.760,0:20:05.360
lisp and now you can use python this way

0:20:04.480,0:20:07.039
one can leverage

0:20:05.360,0:20:09.600
all the python properties like

0:20:07.039,0:20:11.679
multi-threading or some other stuff

0:20:09.600,0:20:13.520
the entire python ecosystem can be

0:20:11.679,0:20:16.159
utilized as well

0:20:13.520,0:20:16.960
such as the qt web engine that is the

0:20:16.159,0:20:20.640
basis for

0:20:16.960,0:20:23.360
our eef browser and pi mu pdf is the

0:20:20.640,0:20:25.840
basis for the ef pdf viewer

0:20:23.360,0:20:28.240
so this really opens the window to many

0:20:25.840,0:20:31.120
many new possibilities to extend emacs

0:20:28.240,0:20:31.120
using eaf

0:20:32.720,0:20:37.760
all right back here we are always

0:20:36.080,0:20:39.679
looking for people to join the

0:20:37.760,0:20:42.720
development there are many many

0:20:39.679,0:20:44.640
more work that needs to be done like

0:20:42.720,0:20:46.640
such as testing and debug if there are

0:20:44.640,0:20:47.760
more linux distros and window managers

0:20:46.640,0:20:51.200
such as i3

0:20:47.760,0:20:52.080
and stuff i mean you can also add new ef

0:20:51.200,0:20:54.240
applications

0:20:52.080,0:20:55.440
or debug and enhance existing af

0:20:54.240,0:20:58.000
applications

0:20:55.440,0:21:00.240
or you can port ef to native wayland

0:20:58.000,0:21:03.840
which i just discussed with the

0:21:00.240,0:21:07.919
the ems whip kit author uh a kill

0:21:03.840,0:21:10.159
akira tile and she he told me that like

0:21:07.919,0:21:11.200
really like it must really yeah it

0:21:10.159,0:21:14.320
doesn't really work

0:21:11.200,0:21:16.799
um native villain because it uses

0:21:14.320,0:21:18.159
x valence so it doesn't work on the pgdk

0:21:16.799,0:21:20.559
port of emacs

0:21:18.159,0:21:22.080
so and we also need people to pour ef to

0:21:20.559,0:21:25.600
non-free operating systems

0:21:22.080,0:21:28.480
including windows and mac os

0:21:25.600,0:21:30.080
and that's because like debug is a linux

0:21:28.480,0:21:31.360
specific feature so it doesn't really

0:21:30.080,0:21:33.039
work on other platform

0:21:31.360,0:21:34.640
we need to change replace it with some

0:21:33.039,0:21:36.720
alternative and

0:21:34.640,0:21:38.640
geographic scene somehow doesn't really

0:21:36.720,0:21:40.320
work on mac os

0:21:38.640,0:21:42.880
and there are many other to-do lists

0:21:40.320,0:21:45.039
available so please have a look

0:21:42.880,0:21:46.640
if and see it's anything you want to

0:21:45.039,0:21:49.039
work on

0:21:46.640,0:21:51.120
all right so since this is a

0:21:49.039,0:21:53.520
pre-recorded talk i won't be able to do

0:21:51.120,0:21:56.080
the q a real time in the video

0:21:53.520,0:21:57.200
however i will be around on the

0:21:56.080,0:22:00.559
collaborate pad

0:21:57.200,0:22:01.360
and the irc imax con you must come

0:22:00.559,0:22:04.240
questions

0:22:01.360,0:22:05.760
to answer any questions it pops up and

0:22:04.240,0:22:09.120
you can also submit an issue

0:22:05.760,0:22:12.640
on the repo and you can check the wiki

0:22:09.120,0:22:15.039
for some other guides and tricks

0:22:12.640,0:22:16.000
all right thank you guys and hopefully

0:22:15.039,0:22:18.320
you find the

0:22:16.000,0:22:24.320
this year project very interesting and

0:22:18.320,0:22:24.320
enjoy the rest of emacs com 2020