Re: matching different line number format in grep-mode

["Aurélien Aptel" <aurelien.aptel+emacs@gmail.com>]

On Wed, Jun 27, 2012 at 10:31 AM, Jim Newton
<jimka.velizy@googlemail.com> wrote:
> can you show me how to do this with define-compilation-mode?

I don't know what define-compilation-mode is, but why can't you use
the compilation-mode and the compilation-error-regexp-alist variable?

Eval this in your scratch buffer (select everything and run M-x eval-region):

    (require 'compile)
    (add-to-list 'compilation-error-regexp-alist '("^at line
\\([0-9]+\\) in file \\(.+\\)$" 2 1))

I've used this as a test (it works):
M-x compile RET echo at line 42 in file /foo/bar RET

To make it permanent you can add this to your .emacs:

    (eval-after-load "compile"
      '(add-to-list 'compilation-error-regexp-alist '("^at line
\\([0-9]+\\) in file \\(.+\\)$" 2 1)))

You have to use eval-after-load in your .emacs because the variable
compilation-...-alist is defined only once compile.el is loaded. And
it is automatically loaded when you call M-x compile or any autoloaded
function in compile.el (the ones with the ;;;###autoload cookie
above).

Alternatively you could just copy what you've pasted in *scratch* in
your .emacs but it load compile.el every time you start emacs i.e. it
will slightly slowdown your emacs startup time.

I'm sorry if all of this is obvious to you.