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:

> Merciadri Luca <Luca.Merciadri@student.ulg.ac.be> writes:
>
>> pjb@informatimago.com (Pascal J. Bourguignon) writes:
>>
>>>
>>> So:
>>>     (while (< (point) (point-max))
>>>         (when (looking-at ".")
>>>             (insert "#"))
>>>         (forward-line))
>>>
>>
>> After extensive testing,
>>
>> ==
>> (defun fildi ()
>>   (find-file "~/Sayings")
>>   (goto-char (point-min))
>>   (while (< (point) (point-max))
>>     (when (looking-at ".")
>>       (insert "#"))
>>     (forward-line)) 
>>   )
>> ==
>>
>> does not work. When I evaluate it using C-x C-e (in a buffer), it only
>> says `fildi', which does not look very interesting. What am I doing
>> wrong? It finds the file; it goes to the beginning of it; while it has
>> not reached the end of the file, it looks for a line containing a dot
>> (as every saying ends by a dot); 
>
> No.  Did you read the documentation of looking-at?
No. I should have done it.
> Because that's
> what you should do for every new function you see!
Nice reflex.

> What does the
> documentation of looking-at says about the arguments of the function?
>
> (looking-at ".")  tests whether the cursor is at position where there
> is any character, but a newline.  That is, it tests whether the line
> contains something, since we should be at the beginning of the line,
> because this is what point-min should be at (actually, unless you
> narrow the region from the middle of a line), and this is ensured by
> forward-line.
Okay, thanks.
>
>> while this works, it inserts a "#"
>> and, as the cursor is at the beginning of the line, it inserts a "#"
>> at the beginning of the line. It also goes to the next line. And?
>
> Wasn't it what you asked for?  Otherwise I didn't understand what you
> wanted.
Sure, but, as I explained in my previous message, it does not even
modify the Sayings file. Why?
- -- 
Merciadri Luca
See http://www.student.montefiore.ulg.ac.be/~merciadri/
- -- 

All flowers are not in one garden.
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