matching different line number format in grep-mode

[Jim Newton]

I have an application which prints line number information not in the standard grep format but as follows.

at line 302 in file /full/path/to/file.ext

Is there something I can do to the variable compilation-error-regexp-alist-alist
which will cause grep-mode to also find these lines?

I see the pattern when I look at the variable, but what's the flow to make either grep-mode or some other mode actually find these lines on next-error ?

Jim

[Stefan Monnier]

> I have an application which prints line number information not in the
> standard grep format but as follows.

> at line 302 in file /full/path/to/file.ext

> Is there something I can do to the variable compilation-error-regexp-alist-alist
> which will cause grep-mode to also find these lines?

Does it have to be grep-mode? If you can use compilation-mode, than
adding the relevant regexp to compilation-error-regexp-alist should
be sufficient. Otherwise you might want to use define-compilation-mode.


Stefan

[Jim Newton]

Thanks Stephan, this is on the right track.

can you show me how to do this with define-compilation-mode?

Jim

[Aurélien Aptel]

On Wed, Jun 27, 2012 at 10:31 AM, Jim Newton
<jimka....@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.

[Stefan Monnier]

> can you show me how to do this with define-compilation-mode?

I'd suggest you try: C-h f grep-mode RET and then to click on "grep.el"
to jump to the definition of grep-mode, which is done with
define-compilation-mode and should be a good example to copy.


Stefan