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Re: Retrieve a web page into buffer and insert some text into it.

From: ken
Subject: Re: Retrieve a web page into buffer and insert some text into it.
Date: Fri, 30 Jul 2010 07:23:26 -0400
User-agent: Thunderbird 2.0.0.24 (X11/20100721) 
Thanks, Denny.  I got the args working right, so it's basically working.
 So now I'm on to another issue: the re-search-forward function.  Again,
it's a syntax thing.

As the code suggests, I'm looking for the html opening body tag.  That
text could be as simple as "<body>", but could also be:

<
 BodY
 fgcolor="hazel"
>

I thought this would work:

(re-search-forward "<\s*[bB][oO][dD][yY]\s.*>" nil t)

but apparently "\s" is being treated as a literal and not as
representing [whitespace].  Also, it doesn't seem that elisp has a
function for doing a case-insensitive RE search.



On 07/29/2010 10:37 PM filebat Mark wrote:
> Hi Ken
> 
> Yes, the parameter of CBARGS in url-retrieve function is confusing.
> I also tried this, but it complains of "wrong number of arguments".
> 
> Let's wait to see whether others have any comment. I will spend some
> time, when I'm free.
> 
> 
> On Fri, Jul 30, 2010 at 4:01 AM, ken <gebser@mousecar.com
> <mailto:gebser@mousecar.com>> wrote:
> 
> 
>     On 07/29/2010 11:22 AM filebat Mark wrote:
>     > Hi Ken
> 
>     Hi, Denny.  Thanks for replying
> 
> 
>     > Where do you set the value of url in the second function?
> 
>     It needs to be passed from the first defun, but I don't know the syntax
>     for doing that.  The url-retrieve function is a little complex in terms
>     of its arguments.  I think it's stumped even the experts on this list.
> 
> 
>     > One big enhancement shall be setting the coding system of the temp
>     > buffer, based on the charset of the html page.
> 
>     Thanks for bringing that up.  Yeah, I followed that on your thread.  I
>     might have to deal with that too.  If, after I get the main part of my
>     code working how I want it, I find it's having that problem, I'll review
>     your emails (which I still have) and perhaps get back to you for
>     some tips.
> 
> 
>     > Regards,
>     > Denny
> 
>     Back at ya!
>     ken
> 
> 
>     >
>     > On Thu, Jul 29, 2010 at 7:46 AM, ken <gebser@mousecar.com
>     <mailto:gebser@mousecar.com>
>     > <mailto:gebser@mousecar.com <mailto:gebser@mousecar.com>>> wrote:
>     >
>     >     Lennart suggested I use a different defun, url-copy-file.  I
>     tried that
>     >     instead, but it didn't work.  But then I went back to my
>     original code,
>     >     moved a single parenthesis and... it worked... mostly.  Here's
>     the code:
>     >
>     >     ------------------------ start ---------------------------
>     >     load url.el
>     >
>     >     (defun www-edit-web-page (url)
>     >      "Retrieve web page and load into new buffer for editing.
>     >     Automatically insert after <body> tag URL, appropriately
>     html-tagged
>     >     URL."
>     >      (interactive "sLoad URL: ")
>     >      (with-temp-buffer (url-retrieve url 'edit-web-page)))
>     >
>     >
>     >     (defun edit-web-page (status)
>     >          "Switch to the buffer returned by `url-retreive'.
>     >        The buffer should contain the web page sent by the server."
>     >          (switch-to-buffer (current-buffer))
>     >        (goto-char 0)
>     >        (re-search-forward "<body.*>" nil t) ;go to end of <body
>     ...> tag.
>     >        ;insert URL into page
>     >        (insert "\n<p>From: <a href=\"" url "\">" url "</a>\n
>     </p>\n\n"))
>     >
>     >     ------------------------ ende ---------------------------
>     >
>     >     This properly fetches the web page and loads it into a new,
>     unsaved
>     >     buffer (exactly what I want), but the last line in the second
>     defun
>     >     doesn't execute.  The error messages are telling me that
>     edit-web-page
>     >     doesn't know the value of "url".  So how do I pass this
>     variable-- with
>     >     its assignment from www-edit-web-page to edit-web-page?  (I have a
>     >     guess, but i'm more a C/bash/blah/blah/blah guy, so elisp is a bit
>     >     mysterious.)
>     >
>     >
>     >
>     >
>     >
>     >
>     > --
>     > Thanks & Regards
>     >
>     > Denny Zhang
>     >
> 
> 
> 
> 
> -- 
> Thanks & Regards
> 
> Denny Zhang
>
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