The main interface to rust-analyzer is the [LSP](https://microsoft.github.io/language-server-protocol/) implementation. To install lsp server, clone the repository and then run `cargo xtask install --server` (which is shorthand for `cargo install --path ./crates/ra_lsp_server`). This will produce a binary named `ra_lsp_server` which you should be able to use it with any LSP-compatible editor. We use custom extensions to LSP, so special client-side support is required to take full advantage of rust-analyzer. This repository contains support code for VS Code and Emacs. ``` $ git clone git@github.com:rust-analyzer/rust-analyzer && cd rust-analyzer $ cargo xtask install --server ``` Rust Analyzer needs sources of rust standard library to work, so you might also need to execute ``` $ rustup component add rust-src ``` See [./features.md](./features.md) document for a list of features that are available. ## VS Code Prerequisites: In order to build the VS Code plugin, you need to have node.js and npm with a minimum version of 10 installed. Please refer to [node.js and npm documentation](https://nodejs.org) for installation instructions. You will also need the most recent version of VS Code: we don't try to maintain compatibility with older versions yet. The experimental VS Code plugin can then be built and installed by executing the following commands: ``` $ git clone https://github.com/rust-analyzer/rust-analyzer.git --depth 1 $ cd rust-analyzer $ cargo xtask install ``` The automatic installation is expected to *just work* for common cases, if it doesn't, report bugs! **Note** [#1831](https://github.com/rust-analyzer/rust-analyzer/issues/1831): If you are using the popular [Vim emulation plugin](https://github.com/VSCodeVim/Vim), you will likely need to turn off the `rust-analyzer.enableEnhancedTyping` setting. If you have an unusual setup (for example, `code` is not in the `PATH`), you should adapt these manual installation instructions: ``` $ git clone https://github.com/rust-analyzer/rust-analyzer.git --depth 1 $ cd rust-analyzer $ cargo install --path ./crates/ra_lsp_server/ --force --locked $ cd ./editors/code $ npm install $ ./node_modules/vsce/out/vsce package $ code --install-extension ./rust-analyzer-0.1.0.vsix ``` It's better to remove existing Rust plugins to avoid interference. Beyond basic LSP features, there are some extension commands which you can invoke via Ctrl+Shift+P or bind to a shortcut. See [./features.md](./features.md) for details. For updates, pull the latest changes from the master branch, run `cargo xtask install` again, and **restart** VS Code instance. See [microsoft/vscode#72308](https://github.com/microsoft/vscode/issues/72308) for why a full restart is needed. ### VS Code Remote You can also use `rust-analyzer` with the Visual Studio Code Remote extensions (Remote SSH, Remote WSL, Remote Containers). In this case, however, you have to manually install the `.vsix` package: 1. Build the extension on the remote host using the instructions above (ignore the error if `code` cannot be found in your PATH: VSCode doesn't need to be installed on the remote host). 2. In Visual Studio Code open a connection to the remote host. 3. Open the Extensions View (`View > Extensions`, keyboard shortcut: `Ctrl+Shift+X`). 4. From the top-right kebab menu (`ยทยทยท`) select `Install from VSIX...` 5. Inside the `rust-analyzer` directory find the `editors/code` subdirectory and choose the `rust-analyzer-0.1.0.vsix` file. 6. Restart Visual Studio Code and re-establish the connection to the remote host. In case of errors please make sure that `~/.cargo/bin` is in your `PATH` on the remote host. ### Settings * `rust-analyzer.highlightingOn`: enables experimental syntax highlighting. Colors can be configured via `editor.tokenColorCustomizations`. As an example, [Pale Fire](https://github.com/matklad/pale-fire/) color scheme tweaks rust colors. * `rust-analyzer.enableEnhancedTyping`: by default, rust-analyzer intercepts. `Enter` key to make it easier to continue comments. Note that it may conflict with VIM emulation plugin. * `rust-analyzer.raLspServerPath`: path to `ra_lsp_server` executable * `rust-analyzer.enableCargoWatchOnStartup`: prompt to install & enable `cargo watch` for live error highlighting (note, this **does not** use rust-analyzer) * `rust-analyzer.excludeGlobs`: a list of glob-patterns for exclusion (see globset [docs](https://docs.rs/globset) for syntax). Note: glob patterns are applied to all Cargo packages and a rooted at a package root. This is not very intuitive and a limitation of a current implementation. * `rust-analyzer.useClientWatching`: use client provided file watching instead of notify watching. * `rust-analyzer.cargo-watch.command`: `cargo-watch` command. (e.g: `clippy` will run as `cargo watch -x clippy` ) * `rust-analyzer.cargo-watch.arguments`: cargo-watch check arguments. (e.g: `--features="shumway,pdf"` will run as `cargo watch -x "check --features="shumway,pdf""` ) * `rust-analyzer.cargo-watch.ignore`: list of patterns for cargo-watch to ignore (will be passed as `--ignore`) * `rust-analyzer.trace.server`: enables internal logging * `rust-analyzer.trace.cargo-watch`: enables cargo-watch logging * `RUST_SRC_PATH`: environment variable that overwrites the sysroot * `rust-analyzer.featureFlags` -- a JSON object to tweak fine-grained behavior: ```jsonc { // Show diagnostics produced by rust-analyzer itself. "lsp.diagnostics": true, // Automatically insert `()` and `<>` when completing functions and types. "completion.insertion.add-call-parenthesis": true, // Enable completions like `.if`, `.match`, etc. "completion.enable-postfix": true, // Show notification when workspace is fully loaded "notifications.workspace-loaded": true, // Show error when no Cargo.toml was found "notifications.cargo-toml-not-found": true, } ``` ## Emacs Prerequisites: `emacs-lsp`, `dash` and `ht` packages. Installation: * add [ra-emacs-lsp.el](../../editors/emacs/ra-emacs-lsp.el) to load path and require it in `init.el` * run `lsp` in a rust buffer * (Optionally) bind commands like `rust-analyzer-join-lines`, `rust-analyzer-extend-selection` and `rust-analyzer-expand-macro` to keys, and enable `rust-analyzer-inlay-hints-mode` to get inline type hints ## Vim and NeoVim (coc-rust-analyzer) * Install coc.nvim by following the instructions at [coc.nvim][] (nodejs required) * Run `:CocInstall coc-rust-analyzer` to install [coc-rust-analyzer], this extension implements _most_ of the features supported in the VSCode extension: - same configurations as VSCode extension, `rust-analyzer.raLspServerPath`, `rust-analyzer.enableCargoWatchOnStartup` etc. - same commands too, `rust-analyzer.analyzerStatus`, `rust-analyzer.startCargoWatch` etc. - highlighting and inlay_hints are not implemented yet [coc.nvim]: https://github.com/neoclide/coc.nvim [coc-rust-analyzer]: https://github.com/fannheyward/coc-rust-analyzer ## Vim and NeoVim (LanguageClient-neovim) * Install LanguageClient-neovim by following the instructions [here][lang-client-neovim] - The github project wiki has extra tips on configuration * Configure by adding this to your vim/neovim config file (replacing the existing rust specific line if it exists): ```vim let g:LanguageClient_serverCommands = { \ 'rust': ['ra_lsp_server'], \ } ``` [lang-client-neovim]: https://github.com/autozimu/LanguageClient-neovim ## NeoVim (nvim-lsp) NeoVim 0.5 (not yet released) has built in language server support. For a quick start configuration of rust-analyzer, use [neovim/nvim-lsp](https://github.com/neovim/nvim-lsp#rust_analyzer). Once `neovim/nvim-lsp` is installed, you can use `call nvim_lsp#setup("rust_analyzer", {})` or `lua require'nvim_lsp'.rust_analyzer.setup({})` to quickly get set up. ## Sublime Text 3 Prequisites: `LSP` package. Installation: * Invoke the command palette with Ctrl+Shift+P * Type `LSP Settings` to open the LSP preferences editor * Add the following LSP client definition to your settings: ```json "rust-analyzer": { "command": ["ra_lsp_server"], "languageId": "rust", "scopes": ["source.rust"], "syntaxes": [ "Packages/Rust/Rust.sublime-syntax", "Packages/Rust Enhanced/RustEnhanced.sublime-syntax" ], "initializationOptions": { "featureFlags": { } }, } ``` * You can now invoke the command palette and type LSP enable to locally/globally enable the rust-analyzer LSP (type LSP enable, then choose either locally or globally, then select rust-analyzer) ### Setting up the `PATH` variable On Unix systems, `rustup` adds `~/.cargo/bin` to `PATH` by modifying the shell's startup file. Depending on your configuration, your Desktop Environment might not actually load it. If you find that `rust-analyzer` only runs when starting the editor from the terminal, you will have to set up your `PATH` variable manually. There are a couple of ways to do that: - for Code, set `rust-analyzer.raLspServerPath` to `~/.cargo/bin` (the `~` is automatically resolved by the extension) - copy the binary to a location that is already in `PATH`, e.g. `/usr/local/bin` - on Linux, use PAM to configure the `PATH` variable, by e.g. putting `PATH DEFAULT=/usr/local/bin:/usr/bin:/usr/local/sbin:/usr/sbin:@{HOME}/.cargo/bin:@{HOME}/.local/bin` in your `~/.pam_environment` file; note that this might interfere with other defaults set by the system administrator via `/etc/environment`.