Successfully call this function, such as the docstring and the pointer Holds the metadata the Lisp compiler will need in order to The macro declares a static variable called Satan that Invokes a C macro (called DEFUN) that reduces some of theīoilerplate. The code has to check the tag andįollow the pointer to retrieve the real values. The Lisp values we are given as arguments are tagged pointers in thisĬase they are pointers to doubles. Porting process without getting distracted by the math. The complicated mathematical bits, on the other hand, are It takes an optional second argument, which makes it The first thing to look at is the C implementation for the atanįunction. Great docs: Emacs has excellent documentation, Remacs should be noĪt this point we focus on porting lisp functions from C to Rust.Ĭurrently there are 642 functions in Rust and 823 in C (May 2019).Īnd there's also a list of long-term goals Leverage the Rust ecosystem: Remacs should use existing RustĬrates wherever possible, and create new, separate crates where our Leverage Rust itself: Remacs should make best use of Rust to $ RUST_BACKTRACE=1 src/remacs -q Design GoalsĬompatibility: Remacs should not break existing elisp code, and # RUST_BACKTRACE is optional, but useful if your instance crashes. You will need a C compiler and toolchain. IMPORTANT: Whenever the toolchain updates, you have to reinstall This happens automatically, so don't override the toolchain manually. The file rust-toolchain indicates the version that gets installed. There's a difference between the idea of Emacs and the current We can drop legacy platforms and compilers. Use a pull request workflow with integrated CI. There have also been separate elisp implementations, such asīy forking, we can explore new development approaches. Is understandably cautious in making far-reaching changes.įorking is a longstanding tradition in the Emacs community for tryingĭifferent approaches. Support and strong backward compatibility requirements. Why A Fork?Įmacs is a widely used tool with a long history, broad platform It much easier for newcomers to contribute. Rust provides many compile-time checks, making it much easier to writeįast, correct code (even when using multithreading). This means weĬan port to Rust incrementally, and having a working Emacs at each We can replace entire C files in Emacs withĬode written in Rust easily interoperates with C. The great libraries available, and just as easy to factor out code for The unit test framework is good, and rustfmt helps ensure formatting The documentation is superb,Īnd the community is very helpful if you get stuck. Nonetheless, we believe the Emacs learning curve pays Niche language, there's probably an Emacs package for it.Įmacs doesn't have a monopoly on good ideas, and there are other great Emacs includes a usage manual,Ī lisp programming manual, pervasive docstrings and even anĮmacs has a broad ecosystem. Recursive editing that allow you to suspend what you'reĬurrently doing, perform other edits, then continue the originalĮmacs has a documentation culture. Many applications use a modal GUI: for example, you can't do otherĮdits during a find-and-replace operation.You can perform structural editing of code, allowing you to makeĬhanges without breaking syntax.Emacs supports a reverse variable search: you can find variables.Emacs allows undoing to any historical state, evenĪllowing tree-based exploration of history. If you undo a change, and then continue editing, you can't redo the.Many platforms have a single item clipboard.Tool for writing C++ classes as well as emails?Įmacs is full of incredible software concepts that haven't hit the Separate applications, functionality is all integrated into your Emacs Nothing isĮmacs provides functionality without applications. You can set variables, tweakįunctions with advice, or redefine entire functions. There's no distinction between your editor and yourĮmacs is a mutable environment. You canĮxecute snippets of code and gradually turn them into a finished You can always find out 'whatĮmacs is an incremental programming environment. However this fork is not about replacing the C code base, but to provide additional features using the rich ecosystem of rust.Ī community-driven port of Emacs to Rust.Įmacs will change how you think about programming.Įmacs is totally introspectable. If you are looking for a rust based emacs fork, you can take a look at emacs-ng.
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