Racer - code completion for Rust

RACER = Rust Auto-Complete-er. A utility intended to provide rust code completion for editors and IDEs. Maybe one day the 'er' bit will be exploring + refactoring or something.

Status

• Does an ok job of static completions: functions, structs, enums etc..

• Not so hot on the dynamic stuff: methods, fields etc.. (yet)

• Also provides 'find-definition' support for jumping around source code

Installation

1. cd racer; cargo build --release

2. Set the RUST_SRC_PATH env variable to point to the 'src' dir in your rust source installation

   (e.g. % export RUST_SRC_PATH=/usr/local/src/rust/src )

3. Test on the command line:

   ./target/release/racer complete std::io::B (should show some completions)

Emacs integration

1. Install emacs 24

2. Install rust-mode. E.g. add the following to .emacs:

   (add-to-list 'load-path "<path-to-rust-srcdir>/src/etc/emacs/") (autoload 'rust-mode "rust-mode" nil t) (add-to-list 'auto-mode-alist '("\\.rs\\'" . rust-mode))

3. Install company mode. (e.g. via ELPA: M-x list-packages, select 'company')

4. Set some variables and install racer. E.g. add this to .emacs:

   (setq racer-rust-src-path "<path-to-rust-srcdir>/src/") (setq racer-cmd "<path-to-racer>/target/release/racer") (add-to-list 'load-path "<path-to-racer>/editors") (eval-after-load "rust-mode" '(require 'racer))

(N.B. racer.el currenly relies on 'company'. The reason for all the 'eval-after-load' stuff is to ensure rust-mode and racer evaluate after company has been loaded)

1. Open a rust file and try typing use std::io::B and press \

2. Place your cursor over a symbol and hit M-. to jump to the definition

Vim integration

1. Install using Pathogen, Vundle or NeoBundle. Or, copy racer/plugin/racer.vim into your .vim/plugin directory.

   Vundle users: Vundle 'phildawes/racer'

   NeoBundle users: NeoBundle 'phildawes/racer', { \ 'build' : { \ 'mac': 'make', \ 'unix': 'make', \ } \ }

2. Add g:racercmd and $RUSTSRC_PATH variables to your .vimrc. Also it's worth turning on 'hidden' mode for buffers otherwise you need to save the current buffer every time you do a goto-definition. E.g.:

   set hidden let g:racer_cmd = "<path-to-racer>/target/release/racer" let $RUST_SRC_PATH="<path-to-rust-srcdir>/src/"

3. In insert mode use C-x-C-o to search for completions

4. In normal mode type 'gd' to go to a definition