Re: Need help writing file-visiting macro

[Martin Slouf <mar@centrum.cz>]

thanks a lot for the hint, Kevin.  i spend some time watching those functions
and a finally read some basic chapters from elisp manual to understand it a bit
more.  It is not so bad as I thought it would be.

martin

On Tue, Jul 26, 2005 at 09:52:13AM -0600, Kevin Rodgers wrote:
> Martin Slouf wrote:
> > Is there an easy modification of this piece of code that can help me 
> to find
> > files in different directories?  i guess these are the string 
> manipulation
> > functions.
> 
> There are also file name manipulation functions, which are generally
> preferable to the lower-level string manipulation functions:
> 
> file-name-directory
> file-name-nondirectory
> file-name-extension
> file-name-sans-extension
> file-name-sans-versions
> file-name-as-directory
> directory-file-name
> expand-file-name
> 
> > The situation is like this:
> >
> > For each business level class (BankAccount.java) (located somewhere 
> under the
> > 'src' directory structure) there are at least two jsp pages:
> > bank_account_edit_.jsp and bank_account_list_.jsp under the 'web' 
> directory
> > structure), ie:
> >
> > top dir
> > +
> > |
> > +-- src (Java source in packages)
> > |    |
> > |    +-- somewhere
> > |            |
> > |            +-- BankAccount.java
> > |
> > +---web (JSP pages using jakarta-struts)
> >      |
> >      +-- somewhere
> >              |
> >              +-- bank_account_edit_.jsp
> > 	     |
> > 	     +-- bak_account_list_.jsp
> >
> >
> > i get those macros (proposed in thi sthread) open the same buffer with
> > modified name in the same directory.  My questions are like this:
> >
> > 1. what string function can be used to make the string BankAccount to
> > transform it into bank_account_edit_ and bank_account_list_
> 
> Hmmm, CamelCase to lower_case.
> http://www.emacswiki.org/cgi-bin/wiki/CamelCase refers to glasses-mode,
> which unfortunately doesn't provide a low level utility function to
> convert strings.  But you can write your own:
> 
> (defun CamelCase-to-lower_case (string)
>   (let ((i 0)
>         (result "")
>         (case-fold-search nil))
>     (while (string-match "[[:upper:]][[:lower:]]*" string i)
>       (setq result
>             (concat result
>                     (substring string i (match-beginning 0))
>                     (if (> (match-beginning 0) 0) "_")
>                     (downcase (match-string 0 string))))
>       (setq i (match-end 0)))
>     (setq result
> 	  (concat result (substring string i)))))
> 
> So (concat (CamelCase-to-lower_case "BankAccount") "_edit_") returns
> "bank_account_edit_".
> 
> > 2. what functions should be used to open those jsp buffers (java
> > buffer respectively)?, when each of this file is / can be in different
> > directory?
> 
> Just stick with find-file, or perhaps
> (switch-to-buffer (find-file-noselect FILE)) or
> (pop-to-buffer (find-file-noselect FILE)).
>