naming convention based file toggling facility

naming convention based file toggling facility

[Robert Anderson]

I've had a hackish little elisp function for years that always struck me
as a slightly surprising omission from emacs: the ability to toggle
between files based on a naming convention like: <source>.c and
<source>.h.

This of course, generalizes to more contexts.  I use it for toggling
between header, implementation, and unittest files, for example, based
on the convention that the corresonding unittest file is
<source>-test.c.  I'm sure it's useful elsewhere, given a reasonable
method for defining the relationship between the names of the related
files.

This kind of "toggle header" or "toggle source" function is standard IDE
fare.  I got used to it from a previous life when I was using Metrowerks
Codewarrior.  It's _very_ handy, IMO.

Is there some reason that such a thing is not included in emacs?  Maybe
it's there and I've missed it?  Would the maintainers be interested in
such a facility if I were to write it?

Bob

Re: naming convention based file toggling facility

[Masatake YAMATO]

> I've had a hackish little elisp function for years that always struck me
> as a slightly surprising omission from emacs: the ability to toggle
> between files based on a naming convention like: <source>.c and
> <source>.h.

M-x ff-find-other-file may be useful.

I have another implementation.

Masatake YAMATO

;; c-alt.el --- Find header file or implementation file

;; Copyright (C) 2000 Masatake YAMATO

;; Author Masatake YAMATO <jet@gyve.org>
;; Created: Tue Jun  4 17:00:22 1996
;; Time-stamp: <00/10/12 20:30:48 masata-y> 

;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2 of the License, or
;; (at your option) any later version.
;; 
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.
;; 
;; You should have received a copy of the GNU General Public License
;; along with this program; if not, write to the Free Software
;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

;; Commentary:
;; 
;; Put .emacs
;; 
;; (add-hook 'c-mode-hook (function (lambda () 
;;       		      (define-key c-mode-map "\C-c\C-v" 'c-find-alternative-file))))
;; (autoload 'c-find-alternative-file "c-alt" "Find .c or .h file" t)

;; Histroy
;; * Thu Oct 12 20:06:36 2000
;; Added c++ supports

(defun c-find-alternative-file (arg)
  "TODO"
  (interactive "P")
  (let* ((fname (buffer-file-name))
	 (basename (file-name-sans-extension fname))
	 (afname nil)
	 (baselen (length basename))
	 (ext (substring fname (1+ baselen))))
    (cond
     ((or (string= ext "c") (string= ext "m") (string= ext "cpp"))
      (setq afname (concat basename ".h"))
      (if (file-exists-p afname)
	  (find-file afname)
	(if arg
	    (find-file afname)
	  (if (y-or-n-p (format "Cannot find! Create %s?: " afname))
	      (find-file afname)
	      ))
      ))
     ((string= ext "h")
      (if (or 
	   (progn (setq afname (concat basename ".m")) (file-exists-p afname))
	   (progn (setq afname (concat basename ".c")) (file-exists-p afname))
	   (progn (setq afname (concat basename ".cpp")) (file-exists-p afname)))
	  (find-file afname)
	(let ((newext (call-interactively 'c-get-alternative-file-name)))
	  (setq afname (concat basename (cond 
					 ((eq newext ?+)
					  ".cpp")
					 ((eq newext ?c)
					  ".c")
					 ((eq newext ?m)
					  ".m")
					 ((eq newext ?n)
					  "")
					 ((eq newext ?y)
					  ".c")
					 (t
					  "")
					 )))
	  (if (not (eq newext ?n))
	      (if (not (eq baselen (length afname)))
		  (find-file afname)
		(error "Wrong extension: %c" newext))))))
     (t
      (error "No alternative file for: %c" fname)))))

(defun c-get-alternative-file-name (ext)
  (interactive "cCannot find! Create?(type n(No) c(C), m(ObjC) or +(C++)): ")
  ext)
  
(provide 'c-alt)
;; c-alt.el ends here.

Re: naming convention based file toggling facility

[Robert Anderson]

On Thu, 2003-09-25 at 00:20, Masatake YAMATO wrote:
> > I've had a hackish little elisp function for years that always struck me
> > as a slightly surprising omission from emacs: the ability to toggle
> > between files based on a naming convention like: <source>.c and
> > <source>.h.
> 
> M-x ff-find-other-file may be useful.
> 
> I have another implementation.

Well look at that.  I'll take a look at both, but it looks pretty close
to what I had in mind.  Thanks!

Bob

Re: naming convention based file toggling facility

[Kim F. Storm]

Robert Anderson <rwa@alumni.princeton.edu> writes:

> I've had a hackish little elisp function for years that always struck me
> as a slightly surprising omission from emacs: the ability to toggle
> between files based on a naming convention like: <source>.c and
> <source>.h.
> 

If you use ido-mode, and your current buffer is xyz.c, then you can
enter C-x C-f C-w to see only the xyz.<something> files.

I realize now that a similar function would be handly when switching
buffers.

-- 
Kim F. Storm <storm@cua.dk> http://www.cua.dk

Re: naming convention based file toggling facility

[Richard Stallman]

    > I've had a hackish little elisp function for years that always struck me
    > as a slightly surprising omission from emacs: the ability to toggle
    > between files based on a naming convention like: <source>.c and
    > <source>.h.

    M-x ff-find-other-file may be useful.

If this does the job, maybe CC mode should provide bindings and menu
bar entrie for it--or for some other clean interface to it.



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Re: naming convention based file toggling facility

[Masatake YAMATO]

>     > I've had a hackish little elisp function for years that always struck me
>     > as a slightly surprising omission from emacs: the ability to toggle
>     > between files based on a naming convention like: <source>.c and
>     > <source>.h.
> 
>     M-x ff-find-other-file may be useful.
> 
> If this does the job, maybe CC mode should provide bindings and menu
> bar entrie for it--or for some other clean interface to it.

ff-find-other-file is useful particularly in c-mode and c++-mode.
However it may be useful in other modes.
e.g. moving between *gud* buffer and .gdbinit.

Next patch is prosaic but it works.

Masatake YAMATO

Index: lisp/bindings.el
===================================================================
RCS file: /cvsroot/emacs/emacs/lisp/bindings.el,v
retrieving revision 1.123
diff -u -r1.123 bindings.el
--- lisp/bindings.el	8 Sep 2003 08:02:45 -0000	1.123
+++ lisp/bindings.el	26 Sep 2003 05:56:23 -0000
@@ -371,6 +371,13 @@
   (interactive)
   (switch-to-buffer (other-buffer)))
 
+(defun mode-line-ff-other-file (event) "\
+Find the header or source file corresponding to the current buffer."
+  (interactive "e")
+  (save-selected-window
+    (select-window (posn-window (event-start event)))
+    (ff-find-the-other-file)))
+
 (defvar mode-line-mode-menu (make-sparse-keymap "Minor Modes") "\
 Menu of mode operations in the mode line.")
 
@@ -449,6 +456,7 @@
   (define-key map [mode-line mouse-3] 'mode-line-bury-buffer)
   (define-key map [header-line down-mouse-3] 'ignore)
   (define-key map [header-line mouse-3] 'mode-line-bury-buffer)
+  (define-key map [mode-line mouse-2] 'mode-line-ff-other-file)
   (setq mode-line-buffer-identification-keymap map))
 
 (defun propertized-buffer-identification (fmt)
@@ -458,7 +466,7 @@
   (list (propertize fmt
 		    'face '(:weight bold)
 		    'help-echo
-		    (purecopy "mouse-1: previous buffer, mouse-3: next buffer")
+		    (purecopy "mouse-1: previous buffer, mouse-2: find related file, mouse-3: next buffer")
 		    'local-map mode-line-buffer-identification-keymap)))
 
 (setq-default mode-line-buffer-identification

Re: naming convention based file toggling facility

[Richard Stallman]

I think the menu bar is a more natural place to put this.  Can you set
it up so that when in a source file, the menu bar item name says
"Header File", and when in a header file, the menu bar item name says
"Source File"?

Ideally, the menu bar item should be enabled only when there
is a corresponding file to go to.


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