Clarify intro in README and manual

The first sentence a new user should see should ideally answer the
questions:

* What is rust-analyzer?
* Why might I want to use it?

The vast majority of users will be interested in using rust-analyzer
inside their favourite editor. We should clarify that rust-analyzer is
an LSP implementation and that it supports all the classic IDE
features.

Whilst it's also true that rust-analyzer is modular and organised into
libraries, the first impression should (I think) focus on an overview
and the primary use case.
This commit is contained in:
Wilfred Hughes 2025-09-08 16:45:58 +01:00
parent a91fb2b9a1
commit 365be20980
2 changed files with 29 additions and 9 deletions

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alt="rust-analyzer logo">
</p>
rust-analyzer is a modular compiler frontend for the Rust language.
It is a part of a larger rls-2.0 effort to create excellent IDE support for Rust.
rust-analyzer is a language server that provides IDE functionality for
writing Rust programs. You can use it with any editor that supports
the [Language Server
Protocol](https://microsoft.github.io/language-server-protocol/) (VS
Code, Vim, Emacs, Zed, etc).
rust-analyzer features include go-to-definition, find-all-references,
refactorings and code completion. rust-analyzer also supports
integrated formatting (with rustfmt) and integrated diagnostics (with
rustc and clippy).
Internally, rust-analyzer is structured as a set of libraries for
analyzing Rust code. See
[Architecture](https://rust-analyzer.github.io/book/contributing/architecture.html)
in the manual.
## Quick Start

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# rust-analyzer
At its core, rust-analyzer is a **library** for semantic analysis of
Rust code as it changes over time. This manual focuses on a specific
usage of the library -- running it as part of a server that implements
rust-analyzer is a language server that provides IDE functionality for
writing Rust programs. You can use it with any editor that supports
the [Language Server
Protocol](https://microsoft.github.io/language-server-protocol/) (LSP).
The LSP allows various code editors, like VS Code, Emacs or Vim, to
implement semantic features like completion or goto definition by
talking to an external language server process.
Protocol](https://microsoft.github.io/language-server-protocol/) (VS
Code, Vim, Emacs, Zed, etc).
rust-analyzer features include go-to-definition, find-all-references,
refactorings and code completion. rust-analyzer also supports
integrated formatting (with rustfmt) and integrated diagnostics (with
rustc and clippy).
Internally, rust-analyzer is structured as a set of libraries for
analyzing Rust code. See
[Architecture](https://rust-analyzer.github.io/book/contributing/architecture.html)
for more details.
To improve this document, send a pull request:
[https://github.com/rust-lang/rust-analyzer](https://github.com/rust-lang/rust-analyzer/blob/master/docs/book/README.md)