1 files changed, 282 insertions, 0 deletions

diff --git a/docs/user/manual.adoc b/docs/user/manual.adoc
new file mode 100644
index 000000000..202783fd9
--- /dev/null
+++ b/docs/user/manual.adoc
@@ -0,0 +1,282 @@
+= User Manual
+:toc: preamble
+:sectanchors:
+:page-layout: post
+:icons: font
+:source-highlighter: rouge
+:experimental:
+
+// Master copy of this document lives in the https://github.com/rust-analyzer/rust-analyzer repository
+
+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 the
+https://microsoft.github.io/language-server-protocol/[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.
+
+To improve this document, send a pull request against
+https://github.com/rust-analyzer/rust-analyzer/blob/master/docs/user/manual.adoc[this file].
+
+If you have questions about using rust-analyzer, please ask them in the https://users.rust-lang.org/c/ide/14["`IDEs and Editors`"] topic of Rust users forum.
+
+== Installation
+
+In theory, one should be able to just install the <<rust-analyzer-language-server-binary,`rust-analyzer` binary>> and have it automatically work with any editor.
+We are not there yet, so some editor specific setup is required.
+
+Additionally, rust-analyzer needs the sources of the standard library.
+If the source code is not present, rust-analyzer will attempt to install it automatically.
+
+To add the sources manually, run the following command:
+
+```bash
+$ rustup component add rust-src
+```
+
+=== VS Code
+
+This is the best supported editor at the moment.
+The rust-analyzer plugin for VS Code is maintained
+https://github.com/rust-analyzer/rust-analyzer/tree/master/editors/code[in tree].
+
+You can install the latest release of the plugin from
+https://marketplace.visualstudio.com/items?itemName=matklad.rust-analyzer[the marketplace].
+By default, the plugin will prompt you to download the matching version of the server as well:
+
+image::https://user-images.githubusercontent.com/9021944/75067008-17502500-54ba-11ea-835a-f92aac50e866.png[]
+
+[NOTE]
+====
+To disable this notification put the following to `settings.json`
+
+[source,json]
+----
+{ "rust-analyzer.updates.askBeforeDownload": false }
+----
+====
+
+The server binary is stored in:
+
+* Linux: `~/.config/Code/User/globalStorage/matklad.rust-analyzer`
+* macOS: `~/Library/Application Support/Code/User/globalStorage/matklad.rust-analyzer`
+* Windows: `%APPDATA%\Code\User\globalStorage\matklad.rust-analyzer`
+
+Note that we only support two most recent versions of VS Code.
+
+==== Updates
+
+The extension will be updated automatically as new versions become available. It will ask your permission to download the matching language server version binary if needed.
+
+===== Nightly
+
+We ship nightly releases for VS Code. To help us out with testing the newest code and follow the bleeding edge of our `master`, please use the following config:
+
+[source,json]
+----
+{ "rust-analyzer.updates.channel": "nightly" }
+----
+
+You will be prompted to install the `nightly` extension version. Just click `Download now` and from that moment you will get automatic updates every 24 hours.
+
+If you don't want to be asked for `Download now` every day when the new nightly version is released add the following to your `settings.json`:
+[source,json]
+----
+{ "rust-analyzer.updates.askBeforeDownload": false }
+----
+
+NOTE: Nightly extension should **only** be installed via the `Download now` action from VS Code.
+
+==== Building From Source
+
+Alternatively, both the server and the plugin can be installed from source:
+
+[source]
+----
+$ git clone https://github.com/rust-analyzer/rust-analyzer.git && cd rust-analyzer
+$ cargo xtask install
+----
+
+You'll need Cargo, nodejs and npm for this.
+
+Note that installing via `xtask install` does not work for VS Code Remote, instead you'll need to install the `.vsix` manually.
+
+==== Troubleshooting
+
+Here are some useful self-diagnostic commands:
+
+* **Rust Analyzer: Show RA Version** shows the version of `rust-analyzer` binary
+* **Rust Analyzer: Status** prints some statistics about the server, like the few latest LSP requests
+* To enable server-side logging, run with `env RA_LOG=info` and see `Output > Rust Analyzer Language Server` in VS Code's panel.
+* To log all LSP requests, add `"rust-analyzer.trace.server": "verbose"` to the settings and look for `Server Trace` in the panel.
+* To enable client-side logging, add `"rust-analyzer.trace.extension": true` to the settings and open the `Console` tab of VS Code developer tools.
+
+==== Special `when` clause context for keybindings.
+You may use `inRustProject` context to configure keybindings for rust projects only. For example:
+[source,json]
+----
+{
+  "key": "ctrl+i",
+  "command": "rust-analyzer.toggleInlayHints",
+  "when": "inRustProject"
+}
+----
+More about `when` clause contexts https://code.visualstudio.com/docs/getstarted/keybindings#_when-clause-contexts[here].
+
+=== rust-analyzer Language Server Binary
+
+Other editors generally require the `rust-analyzer` binary to be in `$PATH`.
+You can download the pre-built binary from the https://github.com/rust-analyzer/rust-analyzer/releases[releases] page.
+Typically, you then need to rename the binary for your platform, e.g. `rust-analyzer-mac` if you're on Mac OS, to `rust-analyzer` and make it executable in addition to moving it into a directory in your `$PATH`.
+
+On Linux to install the `rust-analyzer` binary into `~/.local/bin`, this commands could be used
+
+[source,bash]
+----
+$ curl -L https://github.com/rust-analyzer/rust-analyzer/releases/latest/download/rust-analyzer-linux -o ~/.local/bin/rust-analyzer
+$ chmod +x ~/.local/bin/rust-analyzer
+----
+
+Ensure `~/.local/bin` is listed in the `$PATH` variable.
+
+Alternatively, you can install it from source using the following command:
+
+[source,bash]
+----
+$ git clone https://github.com/rust-analyzer/rust-analyzer.git && cd rust-analyzer
+$ cargo xtask install --server
+----
+
+If your editor can't find the binary even though the binary is on your `$PATH`, the likely explanation is that it doesn't see the same `$PATH` as the shell, see https://github.com/rust-analyzer/rust-analyzer/issues/1811[this issue].
+On Unix, running the editor from a shell or changing the `.desktop` file to set the environment should help.
+
+==== Arch Linux
+
+The `rust-analyzer` binary can be installed from the repos or AUR (Arch User Repository):
+
+- https://www.archlinux.org/packages/community/x86_64/rust-analyzer/[`rust-analyzer`] (built from latest tagged source)
+- https://aur.archlinux.org/packages/rust-analyzer-git[`rust-analyzer-git`] (latest Git version)
+
+Install it with pacman, for example:
+
+[source,bash]
+----
+$ pacman -S rust-analyzer
+----
+
+=== Emacs
+
+Prerequisites: You have installed the <<rust-analyzer-language-server-binary,`rust-analyzer` binary>>.
+
+Emacs support is maintained as part of the https://github.com/emacs-lsp/lsp-mode[Emacs-LSP] package in https://github.com/emacs-lsp/lsp-mode/blob/master/lsp-rust.el[lsp-rust.el].
+
+1. Install the most recent version of `emacs-lsp` package by following the https://github.com/emacs-lsp/lsp-mode[Emacs-LSP instructions].
+2. Set `lsp-rust-server` to `'rust-analyzer`.
+3. Run `lsp` in a Rust buffer.
+4. (Optionally) bind commands like `lsp-rust-analyzer-join-lines`, `lsp-extend-selection` and `lsp-rust-analyzer-expand-macro` to keys.
+
+=== Vim/NeoVim
+
+Prerequisites: You have installed the <<rust-analyzer-language-server-binary,`rust-analyzer` binary>>. Not needed if the extension can install/update it on its own, coc-rust-analyzer is one example.
+
+The are several LSP client implementations for vim or neovim:
+
+==== coc-rust-analyzer
+
+1. Install coc.nvim by following the instructions at
+   https://github.com/neoclide/coc.nvim[coc.nvim]
+   (Node.js required)
+2. Run `:CocInstall coc-rust-analyzer` to install
+   https://github.com/fannheyward/coc-rust-analyzer[coc-rust-analyzer],
+   this extension implements _most_ of the features supported in the VSCode extension:
+   * automatically install and upgrade stable/nightly releases
+   * same configurations as VSCode extension, `rust-analyzer.serverPath`, `rust-analyzer.cargo.features` etc.
+   * same commands too, `rust-analyzer.analyzerStatus`, `rust-analyzer.ssr` etc.
+   * inlay hints for method chaining support, _Neovim Only_
+   * semantic highlighting is not implemented yet
+
+==== LanguageClient-neovim
+
+1. Install LanguageClient-neovim by following the instructions
+   https://github.com/autozimu/LanguageClient-neovim[here]
+   * The GitHub project wiki has extra tips on configuration
+
+2. Configure by adding this to your vim/neovim config file (replacing the existing Rust-specific line if it exists):
++
+[source,vim]
+----
+let g:LanguageClient_serverCommands = {
+\ 'rust': ['rust-analyzer'],
+\ }
+----
+
+==== YouCompleteMe
+
+1. Install YouCompleteMe by following the instructions
+  https://github.com/ycm-core/lsp-examples#rust-rust-analyzer[here]
+
+2. Configure by adding this to your vim/neovim config file (replacing the existing Rust-specific line if it exists):
++
+[source,vim]
+----
+let g:ycm_language_server =
+\ [
+\   {
+\     'name': 'rust',
+\     'cmdline': ['rust-analyzer'],
+\     'filetypes': ['rust'],
+\     'project_root_files': ['Cargo.toml']
+\   }
+\ ]
+----
+
+==== ALE
+
+To use the LSP server in https://github.com/dense-analysis/ale[ale]:
+
+[source,vim]
+----
+let g:ale_linters = {'rust': ['analyzer']}
+----
+
+==== nvim-lsp
+
+NeoVim 0.5 (not yet released) has built-in language server support.
+For a quick start configuration of rust-analyzer, use https://github.com/neovim/nvim-lsp#rust_analyzer[neovim/nvim-lsp].
+Once `neovim/nvim-lsp` is installed, use `+lua require'nvim_lsp'.rust_analyzer.setup({})+` in your `init.vim`.
+
+=== Sublime Text 3
+
+Prerequisites: You have installed the <<rust-analyzer-language-server-binary,`rust-analyzer` binary>>.
+
+You also need the `LSP` package. To install it:
+
+1. If you've never installed a Sublime Text package, install Package Control:
+   * Open the command palette (Win/Linux: `ctrl+shift+p`, Mac: `cmd+shift+p`)
+   * Type `Install Package Control`, press enter
+2. In the command palette, run `Package control: Install package`, and in the list that pops up, type `LSP` and press enter.
+
+Finally, with your Rust project open, in the command palette, run `LSP: Enable Language Server In Project` or `LSP: Enable Language Server Globally`, then select `rust-analyzer` in the list that pops up to enable the rust-analyzer LSP. The latter means that rust-analyzer is enabled by default in Rust projects.
+
+If it worked, you should see "rust-analyzer, Line X, Column Y" on the left side of the bottom bar, and after waiting a bit, functionality like tooltips on hovering over variables should become available.
+
+If you get an error saying `No such file or directory: 'rust-analyzer'`, see the <<rust-analyzer-language-server-binary,`rust-analyzer` binary>> section on installing the language server binary.
+
+=== GNOME Builder
+
+Prerequisites: You have installed the <<rust-analyzer-language-server-binary,`rust-analyzer` binary>>.
+
+Gnome Builder currently has support for RLS, and there's no way to configure the language server executable. A future version might support `rust-analyzer` out of the box.
+
+1. Rename, symlink or copy the `rust-analyzer` binary to `rls` and place it somewhere Builder can find (in `PATH`, or under `~/.cargo/bin`).
+2. Enable the Rust Builder plugin.
+
+== Features
+
+include::./generated_features.adoc[]
+
+== Assists (Code Actions)
+
+Assists, or code actions, are small local refactorings, available in a particular context.
+They are usually triggered by a shortcut or by clicking a light bulb icon in the editor.
+Cursor position or selection is signified by `┃` character.
+
+include::./generated_assists.adoc[]