Re: Refactoring flymake.el

[Sam Steingold <sds@gnu.org>]

Hi João,

One thing about flymake that inconveniences me is that I cannot disable
it for some specific files.
I have a bunch of "scratch.py" files that I use as poor man's notebooks.
To disable flymake on them, I made this chanfe to flymake.el today:

--8<---------------cut here---------------start------------->8---
diff --git a/lisp/progmodes/flymake.el b/lisp/progmodes/flymake.el
index ed34d9aaa5..edb87c92b3 100644
--- a/lisp/progmodes/flymake.el
+++ b/lisp/progmodes/flymake.el
@@ -133,6 +133,13 @@ flymake-master-file-count-limit
   :group 'flymake
   :type 'integer)
 
+(defcustom flymake-disallowed-file-name-regexp nil
+  "File names matching this regexp will not be checked.
+This overrides `flymake-allowed-file-name-masks'."
+  :group 'flymake
+  :type 'string
+  :version "26.1")
+
 (defcustom flymake-allowed-file-name-masks
   '(("\\.\\(?:c\\(?:pp\\|xx\\|\\+\\+\\)?\\|CC\\)\\'" flymake-simple-make-init)
     ("\\.xml\\'" flymake-xml-init)
@@ -228,14 +235,16 @@ flymake-get-file-name-mode-and-masks
   "Return the corresponding entry from `flymake-allowed-file-name-masks'."
   (unless (stringp file-name)
     (error "Invalid file-name"))
-  (let ((fnm flymake-allowed-file-name-masks)
-	(mode-and-masks nil))
-    (while (and (not mode-and-masks) fnm)
-      (if (string-match (car (car fnm)) file-name)
-	  (setq mode-and-masks (cdr (car fnm))))
-      (setq fnm (cdr fnm)))
-    (flymake-log 3 "file %s, init=%s" file-name (car mode-and-masks))
-    mode-and-masks))
+  (unless (and flymake-disallowed-file-name-regexp
+               (string-match flymake-disallowed-file-name-regexp file-name))
+    (let ((fnm flymake-allowed-file-name-masks)
+	  (mode-and-masks nil))
+      (while (and (not mode-and-masks) fnm)
+        (let ((item (pop fnm)))
+          (when (string-match (car item) file-name)
+	    (setq mode-and-masks (cdr item)))))
+      (flymake-log 3 "file %s, init=%s" file-name (car mode-and-masks))
+      mode-and-masks)))
 
 (defun flymake-can-syntax-check-file (file-name)
   "Determine whether we can syntax check FILE-NAME.
--8<---------------cut here---------------end--------------->8---

and set `flymake-disallowed-file-name-regexp` to "scratch".
it seems to be working, so I was thinking about pushing it.
Do you think there is a better approach?

Thanks.

-- 
Sam Steingold (http://sds.podval.org/) on darwin Ns 10.3.1504
http://steingoldpsychology.com http://www.childpsy.net
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In the race between idiot-proof software and idiots, the idiots are winning.