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authorRamin Honary <ramin@tropic-isle.honary.home>2024-11-13 22:49:52 +0900
committerRamin Honary <ramin@tropic-isle.honary.home>2024-11-13 22:49:52 +0900
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parent0a836323d1ca15b73f907187cfde237383b02c29 (diff)
downloademacsconf-wiki-e6f7446b6004b04eced8711482346e4caf4a768f.tar.xz
emacsconf-wiki-e6f7446b6004b04eced8711482346e4caf4a768f.zip
post my slides on my presentation page
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# Gypsum: my clone of Emacs and ELisp written in Scheme
-Ramin Honary (he/him) - E-mail: <mailto:ramin.honary@gmail.com> - ActivityPub: @ramin_hal9001@fe.disroot.org - Website: <https://tilde.town/~ramin_hal9001>
+Ramin Honary (he/him)
+
+ - E-mail: <mailto:ramin.honary@gmail.com>
+ - ActivityPub: @ramin_hal9001@fe.disroot.org
+ - Website: <https://tilde.town/~ramin_hal9001>
[[!inline pages="internal(2024/info/gypsum-before)" raw="yes"]]
+## Slides
+
+### Introduction
+
+1. Ramin Honary
+
+ - Emacs enthusiast since 2017
+
+ - Software developer (full stack)
+
+ - I love Haskell, Scheme, functional programming
+
+ - Started learning Scheme about 2 years ago
+
+2. My project: an Emacs Clone
+
+ - Tentative name: "Gypsum"
+ - Its not a great name, open to suggestions.
+
+### Goal: to Clone **Emacs Lisp**
+
+- Many clones already:
+
+ - Edwin, Jed, jEdit, Jove, Lem, MG, Yi, Zile
+
+- These only clone the key bindings, not Elisp
+
+- Only XEmacs (a fork of GNU Emacs) provided an alternative Emacs Lisp
+
+### Most people don't use Emacs for the keybindings
+
+- Anecodtal, but yes really.
+
+- Use Emacs because of the power of Emacs Lisp
+
+- Emacs is as powerful as a system shell
+
+- A good language is what makes it powerful
+
+### Goal: use R7RS Standard Scheme
+
+- I want it to work on a many Scheme implementations
+
+- Guile is the reference implementation
+
+- (more about this later)
+
+### Goal: able to run any `init.el`
+
+- Should be able to use `init.el` without significant changes
+
+- Many invest significant time in their configs
+
+- Suddenly not having your config is disruptive
+
+- Such an Emacs clone would be more useful
+
+### Why do this?
+
+- I personally like Scheme's minimalism.
+
+- Use Scheme as more than just an academic language.
+
+- Seems to be a lot of interest in a project like this.
+
+- Talk of "Guile Emacs" for about 30 years
+
+### A long history of Guile Emacs (1/3)
+
+- **Early 90s**: Initial discussion between RMS, Tom Lord,
+ Aubrey Jaffer, begin work on replacing Emacs Lisp with Scheme.
+
+- **1999--2009**: Ken Raeburn's [Guile-Based Emacs](https://www.mit.edu/~raeburn/guilemacs/).
+ (My project is similar.)
+
+ > "*This project that I (Ken Raeburn) have started is for converting*
+ > *GNU Emacs to use Guile as its programming language. Support for*
+ > *Emacs Lisp will continue to exist, of course, but it may be*
+ > *through translation and/or interpretation; the Lisp engine itself*
+ > *may no longer be the core of the program.*"
+
+### A long history of Guile Emacs (2/3)
+
+- **2010**: Andy Wingo and Ludovic Courtes
+ take maintainership of Guile project.
+
+- **2009--2011**: Emacs Lisp interpreter implemented in Guile.
+ Still ships with Guile.
+
+- **2011**: Guile 2.0 is released
+
+- **2011--2015**: Robin Templeton's GSoC project.
+ (Is presenting later today!)
+
+### A long history of Guile Emacs (3/3)
+
+- **2020**: Vasilij Schneidermann published an overview called
+ "[The State of Emacs Lisp on Guile](https://emacsninja.com/posts/state-of-emacs-lisp-on-guile.html)".
+
+- **2020 to present**: Guile Emacs is dead? Andrea Corallo, GCC Emacs,
+ JIT-compiler for Emacs Lisp based on "libgccjit", brings into
+ question any need for combining Guile with Emacs.
+
+### Demo
+
+### GUI is barely working
+
+- I have almost no experience with Gtk or GObject Introspection
+
+- Hard to debug, crashes at C-level produce no stack traces
+
+- Using GDB requires rebuilding all of Gtk, GIO, GLib, etc.
+
+### Emacs Lisp parser based on Guile Emacs Lisp
+
+- Foked the Guile Emacs Lisp implementation for easier development
+
+- Have already submitted a patch to the parser upstream
+
+### Emacs Lisp interpter is barely working
+
+- Implementing my own interpreter in portable Scheme
+
+- Monadic pattern matcher
+
+### Can parse but not interpret "`subr.el`"
+
+- "`subr.el`" is the first ELisp file run by Emacs
+
+- A good way to determine what to work on first
+
+### A call for help
+
+### Latest Emacs has **1,393** built-in functions
+
+- I could never implement that many functions alone
+
+- Probably not all are required to create a useful editor
+
+### My job is to make contributing easy
+
+- Document the build and test process
+
+- Document the system architecture
+
+- Prioritize which built-in functions are most essential
+
+- Find low-hanging fruit, use as means to teach others
+
+### The work for which I will take responsibility
+
+- Clone enough Elisp to be able to run ERT tests
+
+- Then use GNU Emacs's own regression tests to test patches
+
+- Make sure there is a usable GUI
+
+- (Someday?) be able to contribute a patch from within
+
+### Quick architectural overview
+
+### The editor is based in Scheme, not Emacs Lisp
+
+- Config, scripting, packages all done in Scheme
+
+- Use of Emacs Lisp for scripting not encouraged
+
+- Should still be able to run your `init.el`
+
+- Ideally should be able to run ELPA packages
+
+### Difference with Robin Templeton's project
+
+- Guile-Emacs links Guile runtime into Emacs
+
+- Not a Scheme application
+
+- An IDE for Schemers
+
+### Emacs Lisp is an "environment"
+
+- "Environments" are a feature of Scheme
+
+- Scheme procedures can be called from Emacs Lisp
+
+- Scheme state can be mutated by Emacs Lisp
+
+- (See "`./gypsum/elisp-eval.scm`", "`new-env`")
+
+### "Functional Lenses"
+
+- Because R7RS does not standardize MOP (not even in "large")
+
+- Inspired by Haskell
+
+- Composes getters and setters
+
+- Single source file, easy to port
+
+- Ported to 3 other Schemes
+
+### A lot of work went into keymaps data structure
+
+- Keybindings are an important part of Emacs
+
+- Had to do this well from very beginning
+
+- Keybindings work correctly in demo
+
+### A lot of work went into separating GUI from Editor logic
+
+- "Parameters" are a feature of Scheme
+
+- Platform-specific APIs are always parameterized
+
+ - Windowing and widgets
+
+ - Translate key events to bindings
+
+ - Evaluating Scheme expressions
+
+ - Text buffering and rendering
+
+- (See "`./gypsum/editor-impl.scm`")
+
+### Monadic pattern matching
+
+- Simpler, more portable
+
+- (Not as feature-rich)
+
+- Easier than porting SRFI-241 ("Match") to Guile
+
+- No relation to SRFI-247 ("Syntatic Monads")
+
+- You can still use pattern matching
+
+### Monad pattern matching
+
+Example program
+
+
+ (define push-stack (put-with cons))
+ (define collatz
+ (many
+ push-stack
+ (either
+ (try (check (λ (n) (<= n 1)))
+ (success))
+ (try (check odd?)
+ (next (λ (n) (+ 1 (* 3 n)))))
+ (try (check even?)
+ (next (λ (n) (quotient n 2))))
+ (fail "not an integer")
+ )))
+
+### Conclusion
+
+- I am just getting the ball rolling
+
+- Helping others contribute is my top priority
+
+- ActivityPub :: `ramin_hal9001@fe.disroot.org`
+
+- E-mail :: <span class="spurious-link"
+ target="ramin.honary@gmail.com">*ramin.honary@gmail.com*</span>
+
+- Homepage :: <https://tilde.town/~ramin_hal9001>
+
+- Codeberg :: <https://codeberg.org/ramin_hal9001>
+
+- This presentation :: <https://emacsconf.org/2024/talks/gypsum/>
+
+
+## Original presentation proposal
I would like to demonstrate an Emacs clone I have been
writing in Guile Scheme for the past year, which I am
tentatively calling "Gypsum". Unlike other editors which