Emacsy Shane Celis GNU Hackers Meeting Paris, France August 24th, - - PowerPoint PPT Presentation

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Emacsy Shane Celis GNU Hackers Meeting Paris, France August 24th, - - PowerPoint PPT Presentation

May 22, 2023 312 likes •1.08k views

Emacsy Shane Celis GNU Hackers Meeting Paris, France August 24th, 2013 Agenda Intended Audience What is Emacsy? What is Emacs? Demos Whats next? Where to get it Audience Audience Interactive application

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Emacsy

Shane Celis

GNU Hackers Meeting Paris, France August 24th, 2013

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Agenda

  • Intended Audience
  • What is Emacsy?
  • What is Emacs?
  • Demos
  • What’s next?
  • Where to get it
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Audience

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Audience

  • Interactive application developers
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Audience

  • Interactive application developers
  • Emacs users
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Audience

  • Interactive application developers
  • Emacs users
  • Why base it off Emacs?
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Emacsy: Google Summer of Code

  • Officially started this Summer
  • Working with Ludovic Courtès from GNU

Project

  • Received lots of help from #guile on

freenode.net

  • Special thanks to Andy Wingo and Mark

Weaver

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What is Emacsy?

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What is Emacsy?

  • It’s an embeddable Emacs-like library.
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What is Emacsy?

  • It’s an embeddable Emacs-like library.
  • How Emacs-like exactly?
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A Joke That Explains

Emacs is a great operating system–lacking

  • nly a decent editor.

Emacs Mail Reader

Emacs Extensions

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A Joke That Explains

Emacs is a great operating system–lacking

  • nly a decent editor.

Emacs Mail Reader

Emacs Extensions

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A Joke That Explains

Emacs is a great operating system–lacking

  • nly a decent editor.

Emacs Mail Reader

Emacs Extensions

"Emacs OS" Text Editor Mail Reader

Emacs Extensions

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Emacsy Features

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Emacsy Features

  • lisp interpreter
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Emacsy Features

  • lisp interpreter
  • keymaps
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Emacsy Features

  • lisp interpreter
  • keymaps
  • minibuffer
  • history
  • completion
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Emacsy Features

  • lisp interpreter
  • keymaps
  • minibuffer
  • history
  • completion
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Emacsy Features

  • lisp interpreter
  • keymaps
  • minibuffer
  • history
  • completion
  • recordable

macros

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Emacsy Features

  • lisp interpreter
  • keymaps
  • minibuffer
  • history
  • completion
  • recordable

macros

  • comprehensive
  • nline help
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Emacsy Features

  • lisp interpreter
  • keymaps
  • minibuffer
  • history
  • completion
  • recordable

macros

  • comprehensive
  • nline help
  • major and minor

modes

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Emacsy Anti-goals

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Emacsy Anti-goals

  • Emacsy is not an Emacs replacement
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Emacsy Anti-goals

  • Emacsy is not an Emacs replacement
  • not a text editor
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Emacsy Anti-goals

  • Emacsy is not an Emacs replacement
  • not a text editor
  • not elisp compatible
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Different Integration Strategy

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What is Emacs?

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What is Emacs?

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What is Emacs?

  • It’s a text editor,
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What is Emacs?

  • It’s a text editor,
  • a mail reader,
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What is Emacs?

  • It’s a text editor,
  • a mail reader,
  • a shell,
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What is Emacs?

  • It’s a text editor,
  • a mail reader,
  • a shell,
  • a lisp interpreter,
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What is Emacs?

  • It’s a text editor,
  • a mail reader,
  • a shell,
  • a lisp interpreter,
  • a web browser.
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What is Emacs?

Beautiful Architecture. Ch. 11. “GNU Emacs: Creeping Featurism is a Strength” by Jim Blandy

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Model View Controller

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Model View Controller

  • The buffer is a model.
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Model View Controller

  • The buffer is a model.
  • The window is a view.
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Model View Controller

  • The buffer is a model.
  • The window is a view.
  • The controller is all the elisp code.
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Praising the Model

  • A buffer is plaintext.
  • Emacs is not a word processor; no bold,

italics, nor attributes are embedded into the model.

  • It’s simple.
  • It’s all just text.
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Other Simple Models

  • It’s all just blocks.
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Simple Model

  • Users can make very complicated things
  • ut of simple building blocks.
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Emacs is Extensible

  • It’s a text editor,
  • a mail reader,
  • a shell,
  • a lisp interpreter,
  • a web browser.
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The Fix is In

  • The view is fixed.
  • The model is fixed.
  • Only the controller is extensible with elisp.
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Emacsy

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Emacsy

  • The view is not fixed.
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Emacsy

  • The view is not fixed.
  • The model is not fixed.
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Emacsy

  • The view is not fixed.
  • The model is not fixed.
  • The controller is extensible with GNU

Guile Scheme.

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Vision

Cameron, D., Rosenblatt, B., & Raymond, E. S. (1996). Learning GNU

  • Emacs. O'Reilly Media.
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Vision

Cameron, D., Rosenblatt, B., & Raymond, E. S. (1996). Learning GNU

  • Emacs. O'Reilly Media.
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Vision

Cameron, D., Rosenblatt, B., & Raymond, E. S. (1996). Learning GNU

  • Emacs. O'Reilly Media.

Emacsy

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Vision

Cameron, D., Rosenblatt, B., & Raymond, E. S. (1996). Learning GNU

  • Emacs. O'Reilly Media.

Emacsy

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Vision

Cameron, D., Rosenblatt, B., & Raymond, E. S. (1996). Learning GNU

  • Emacs. O'Reilly Media.

Emacsy

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Vision

Cameron, D., Rosenblatt, B., & Raymond, E. S. (1996). Learning GNU

  • Emacs. O'Reilly Media.

Emacsy

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Vision

Cameron, D., Rosenblatt, B., & Raymond, E. S. (1996). Learning GNU

  • Emacs. O'Reilly Media.

Emacsy

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Emacs(y) Architecture

C Core Elisp Interpreter Emacs Core Emacs Extensions

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Emacs(y) Architecture

C Core Elisp Interpreter Emacs Core Emacs Extensions C/C++ App Lisp Interpreter Emacsy Core Emacsy Extensions

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Emacs(y) Architecture

C Core Elisp Interpreter Emacs Core Emacs Extensions C/C++ App Lisp Interpreter Emacsy Core Emacsy Extensions

}

Emacsy

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Emacs(y) Architecture

C Core Elisp Interpreter Emacs Core Emacs Extensions C/C++ App Lisp Interpreter Emacsy Core Emacsy Extensions

}

Emacsy

} Your App

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Demo!

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Levels of Integration

  • 1. No buffer support
  • 2. Multiple buffers
  • 3. Multiple windows
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What Guile Provides that Elisp Doesn’t

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What Guile Provides that Elisp Doesn’t

  • Continuations
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What Guile Provides that Elisp Doesn’t

  • Continuations
  • Modules
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What Guile Provides that Elisp Doesn’t

  • Continuations
  • Modules
  • Foreign Function Interface (FFI)
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What Guile Provides that Elisp Doesn’t

  • Continuations
  • Modules
  • Foreign Function Interface (FFI)
  • Threads
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Taking Advantage of Guile

  • Continuations can be used to build

“system-calls” but in userland

  • Blocking in Scheme without blocking in C
  • Non-blocking events
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Modules

  • In my Emacs environment, I have 6,029

commands available at all times.

  • Many aren’t useful in my current context.
  • Can we be more careful in what commands

we expose?

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Context Sensitive Commands

  • Idea: Export commands to a module
  • Each buffer could have a “MODULE_PATH”

that works like PATH in bash

  • M-x only looks up commands in the

MODULE_PATH

  • C-u M-x looks up all commands
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Comprehensive Help

  • Emacs has a great help system!
  • What will Emacsy do?
  • Options:
  • 1. Do it all in minibuffer.
  • 2. Use a text buffer like Emacs.
  • 3. Use a local web server.
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Beyond Emacs

  • Job control
  • Continuations → Coroutines →

Cooperative Multitasking

  • Major modes
  • Are major modes worth it?
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Available Now

  • Alpha quality
  • Recommend release v 0.1.1
  • Available under the GNU GPLv3

https://github.com/shanecelis/emacsy

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Thanks for watching!

contact: shane.celis@gmail.com twitter: @shanecelis repo: https://github.com/shanecelis/emacsy

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Acknowledgments

  • GNU Emacs project (Thank you, RMS!)
  • GNU Guile project
  • The guys at #guile@irc.freenode.net
  • Nykia Hunter for the elephant and narwhal

graphics

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Questions?