Make ant regexp in compilation-error-regexp-alist-alist more lax

* lisp/progmodes/compile.el: Make ant regexp accept filenames that may
occur on Cygwin (like c:/test) and optional additional severity level
after task name.
* etc/compilation.txt: Add sample.

1 files changed, 5 insertions, 2 deletions

diff --git a/lisp/progmodes/compile.el b/lisp/progmodes/compile.el
index b0bb728de0e..f412dbcd546 100644
--- a/lisp/progmodes/compile.el
+++ b/lisp/progmodes/compile.el
@@ -181,9 +181,12 @@ of[ \t]+\"?\\([a-zA-Z]?:?[^\":\n]+\\)\"?:" 3 2 nil (1))
     (aix
      " in line \\([0-9]+\\) of file \\([^ \n]+[^. \n]\\)\\.? " 2 1)
 
+    ;; Checkstyle task may report its own severity level: "[checkstyle] [ERROR] ..."
+    ;; (see AuditEventDefaultFormatter.java in checkstyle sources).
     (ant
-     "^[ \t]*\\[[^] \n]+\\][ \t]*\\(\\(?:[A-Za-z]:\\\\\\)?[^: \n]+\\):\\([0-9]+\\):\\(?:\\([0-9]+\\):\\([0-9]+\\):\\([0-9]+\\):\\)?\
-\\( warning\\)?" 1 (2 . 4) (3 . 5) (6))
+     "^[ \t]*\\(?:\\[[^] \n]+\\][ \t]*\\)\\{1,2\\}\\(\\(?:[A-Za-z]:\\)?[^: \n]+\\):\
+\\([0-9]+\\):\\(?:\\([0-9]+\\):\\([0-9]+\\):\\([0-9]+\\):\\)?\\( warning\\)?"
+     1 (2 . 4) (3 . 5) (6))
 
     (bash
      "^\\([^: \n\t]+\\): line \\([0-9]+\\):" 1 2)