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Modern on the fly syntax checking for GNU Emacs
Emacs Lisp Makefile Python Rust Ruby C++ Other

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Additional checkers for flymake.

This library extends the flymake, the on-the-fly syntax checker of GNU Emacs, with checkers for various programming and markup languages. It also replaces outdated or broken checkers built-in to flymake.


Provided syntax checkers:

  • Emacs Lisp
  • Python
  • Ruby
  • CoffeeScript
  • Shell scripts (Bash, Dash and Zsh)
  • TeX/LaTeX


Install the ELPA packages from or Marmalade with M-x package-install flymake-checkers.

Or download the latest release and install flymake-checkers.el with M-x package-install-file.

The library is written and tested against GNU Emacs 24 and may or may not work in earlier versions of GNU Emacs.

Most checkers have dependencies against external tools that perform the checking. See Checkers for details.


Just enable flymake-mode, either automatically by adding the following code to your init.el file.

;; Enable flymake for all files
(add-hook 'find-file-hook 'flymake-find-file-hook)

Or manually by M-x flymake-mode after visiting a file.

The checkers provided by this library are automatically registered with flymake, and flymake will automatically choose the proper checker for the current buffer.


You need to install external utilities for the following checkers:

Install flake8, pyflakes or pylint.
Install Ruby.
Install coffeelint.
Install chktex. Most TeX distributions, including TeXLive and MacTeX, already do this for you.
Shell scripts
Install Bash or Zsh depending on the type of shell file you want to check.


  • M-x customize-group flymake-checkers
  • M-x customize-group flymake

Further help

  • C-h f flymake


The Vim library syntastic by Martin Grenfell inspired many of the checkers.


This program 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 2 of the License, or (at your option) any later version.

This program 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, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

See COPYING for details.

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