Re: Adding `#' at each new line with text until the end of the file

[Merciadri Luca <Luca.Merciadri@student.ulg.ac.be>]

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pjb@informatimago.com (Pascal J. Bourguignon) writes:

>> Sure, but, as I explained in my previous message, it does not even
>> modify the Sayings file. Why?
>
> Because you didn't instruct the program to modify the file.
> Read the documentation of insert, for example.  Does it mention files?
> What does insert modify?
Insert modifies the current buffer, according to the manual. Or
find-file loads its arg into a buffer. So, if find-file loads its arg
into the *current* buffer, insert should modify the current buffer,
that is, `Sayings'.

> Here is a macro that could be useful:
>
> (require 'cl)
> (defmacro* with-file (file-and-options &body body)
>   "Processes BODY with a buffer on the given file.
> DO:              find-file or find-file-literally, process body, and
>                  optionally save the buffer and kill it.
>                  save is not done if body exits exceptionnaly.
>                  kill is always done as specified.
> FILE-AND-OPTION: either an atom evaluated to a path,
>                  or (path &key (save t) (kill t) (literal nil))
> "
>   (if (atom file-and-options)
>       `(with-file (,file-and-options) ,@body)
>     ;; destructuring-bind is broken, we cannot give anything else than nil
>     ;; as default values:
>     (destructuring-bind (path &key (save nil savep) (kill nil killp)
>                               (literal nil literalp))
>         file-and-options
>       (unless savep (setf save t))
>       (unless killp (setf kill t))
>       `(unwind-protect
>            (progn
>              (,(if literal 'find-file-literally 'find-file) ,path)
>              (prog1 (save-excursion ,@body)
>                ,(when save `(save-buffer 1))))
>          ,(when kill
>             `(kill-buffer (current-buffer)))))))
Thanks. I'll keep it.

- -- 
Merciadri Luca
See http://www.student.montefiore.ulg.ac.be/~merciadri/
- -- 

The whole dignity of man lies in the power of thought. 
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