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+;;; flymake-rust.el --- A flymake handler for rust-mode files
+;;
+;;; Author: Joao Oliveira <joaoxsouls@gmail.com>
+;;; URL: https://github.com/joaoxsouls/flymake-rust
+;; Package-Version: 20170729.2139
+;; Package-Commit: 2f42d1f2dad73ec9de460eda6176e3ab25c446f0
+;;; Version: DEV
+;;; Package-Requires: ((flymake-easy "0.1"))
+
+;; This file is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 3, or (at your option)
+;; any later version.
+
+;; This file is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <http://www.gnu.org/licenses/>.;;;
+
+;;; Commentary:
+;; Usage:
+;;   (require 'flymake-rust)
+;;   (add-hook 'rust-mode-hook 'flymake-rust-load)
+;;
+;; If you want to use rustc compiler, you must add following string:
+;;   (setq flymake-rust-use-cargo 1)
+;;
+;; Uses flymake-easy, from https://github.com/purcell/flymake-easy
+
+;;; Code:
+
+(require 'flymake-easy)
+
+(defconst flymake-rust-err-line-patterns
+  '(("^\\(.*\\)\n   --> \\(.*.rs\\):\\([0-9]+\\):\\([0-9]+\\)$" 2 3 4 1)
+    ("^\\(.*.rs\\):\\([0-9]+\\):[0-9]+: [0-9]+:[0-9]+ [a-z]+: \\(.*\\)$" 1 2 nil 3)
+    ("^\\(.*.rs\\):\\([0-9]+\\) \\(.*\\)$" 1 2 nil 3)))
+
+(setq-default flymake-rust-use-cargo 1)
+
+(if flymake-rust-use-cargo
+    (defvar flymake-rust-executable "cargo"
+      "The rust executable to use for syntax checking.")
+    (defvar flymake-rust-executable "rustc"
+      "The rust executable to use for syntax checking.")
+)
+
+;; Invoke rust "--parse-only" to get syntax checking
+(defun flymake-rust-command (filename)
+  "Construct a command that flymake can use to check rust source."
+  (if flymake-rust-use-cargo
+      (list flymake-rust-executable "build")
+      (list flymake-rust-executable "--no-trans" filename)
+      )
+  )
+
+;; Load rust-flymake
+(defun flymake-rust-load ()
+  "Configure flymake mode to check the current buffer's rust syntax."
+  (interactive)
+  (flymake-easy-load 'flymake-rust-command
+                     flymake-rust-err-line-patterns
+                     'inplace
+                     "rs"))
+
+(provide 'flymake-rust)
+;;; flymake-rust.el ends here