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+;; erlang-flymake.el
+;;
+;; Syntax check erlang source code on the fly (integrates with flymake).
+;;
+;; Start using flymake with erlang by putting the following somewhere
+;; in your .emacs file:
+;;
+;; (require 'erlang-flymake)
+;;
+;; Flymake is rather eager and does its syntax checks frequently by
+;; default and if you are bothered by this, you might want to put the
+;; following in your .emacs as well:
+;;
+;; (erlang-flymake-only-on-save)
+;;
+;; There are a couple of variables which control the compilation options:
+;; * erlang-flymake-get-code-path-dirs-function
+;; * erlang-flymake-get-include-dirs-function
+;; * erlang-flymake-extra-opts
+;;
+;; This code is inspired by http://www.emacswiki.org/emacs/FlymakeErlang.
+
+(require 'flymake)
+(eval-when-compile
+ (require 'cl))
+
+(defvar erlang-flymake-get-code-path-dirs-function
+ 'erlang-flymake-get-code-path-dirs
+ "Return a list of ebin directories to add to the code path.")
+
+(defvar erlang-flymake-get-include-dirs-function
+ 'erlang-flymake-get-include-dirs
+ "Return a list of include directories to add to the compiler options.")
+
+(defvar erlang-flymake-extra-opts
+ (list "+warn_obsolete_guard"
+ "+warn_unused_import"
+ "+warn_shadow_vars"
+ "+warn_export_vars"
+ "+strong_validation"
+ "+report")
+ "A list of options that will be passed to the compiler")
+
+(defun erlang-flymake-only-on-save ()
+ "Trigger flymake only when the buffer is saved (disables syntax
+check on newline and when there are no changes)."
+ (interactive)
+ ;; There doesn't seem to be a way of disabling this; set to the
+ ;; largest int available as a workaround (most-positive-fixnum
+ ;; equates to 8.5 years on my machine, so it ought to be enough ;-) )
+ (setq flymake-no-changes-timeout most-positive-fixnum)
+ (setq flymake-start-syntax-check-on-newline nil))
+
+
+(defun erlang-flymake-get-code-path-dirs ()
+ ())
+
+(defun erlang-flymake-get-include-dirs ()
+ ())
+
+(defun erlang-flymake-init ()
+ (let* ((temp-file
+ (flet ((flymake-get-temp-dir () (erlang-flymake-temp-dir)))
+ (flymake-init-create-temp-buffer-copy
+ 'flymake-create-temp-with-folder-structure)))
+ (code-dir-opts
+ (erlang-flymake-flatten
+ (mapcar (lambda (dir) (list "-pa" dir))
+ (funcall erlang-flymake-get-code-path-dirs-function))))
+ (inc-dir-opts
+ (erlang-flymake-flatten
+ (mapcar (lambda (dir) (list "-I" dir))
+ (funcall erlang-flymake-get-include-dirs-function))))
+ (compile-opts
+ (append inc-dir-opts
+ code-dir-opts
+ erlang-flymake-extra-opts)))
+ (list "erlc" (append compile-opts (list temp-file)))))
+
+(defun erlang-flymake-temp-dir ()
+ ;; Squeeze the user's name in there in order to make sure that files
+ ;; for two users who are working on the same computer (like a linux
+ ;; box) don't collide
+ (format "%s/flymake-%s" temporary-file-directory user-login-name))
+
+(defun erlang-flymake-flatten (list)
+ (apply #'append list))
+
+(add-to-list 'flymake-allowed-file-name-masks
+ '("\\.erl\\'" erlang-flymake-init))
+(add-hook 'erlang-mode-hook 'flymake-mode)
+
+(provide 'erlang-flymake)
+;; erlang-flymake ends here