Re: [PATCH] gitweb: Add charset info to "raw" blob output

[Jakub Narebski <jnareb@gmail.com>]

On Sat, 31 May 2008, Junio C Hamano wrote:
> Jakub Narebski <jnareb@gmail.com> writes:
> 
>> Always add charset info from $default_text_plain_charset (if it is
>> defined) to "raw" (a=blob_plain) output for 'text/plain' blobs.
>> Adding charset info in a special case was removed from blob_mimetype().
>>
>> Signed-off-by: Jakub Narebski <jnareb@gmail.com>
>> ---
> 
> Looks Ok but it took a bit of digging on the list for me to figure out
> that something like this was missing from the beginning of your commit log
> message:
> 
> 	Earlier "blob_plain" view sent "charset=utf-8" only when gitweb
> 	guessed the content type to be text by reading from it, and not
> 	when the MIME type was obtained from /etc/mime.types.
> 
> 	This fixes the bug by always adding....

I'm sorry that I have forgot to put the "why" in commit message.
I'd add this when resending v2 of this patch.

Thanks for a comment.

> But I wonder if moving of this to the calling site is the right thing to
> do.  Wouldn't it become much more contained and robust if you did it this
> way?
[...]
>  sub blob_mimetype {

This _might_ be better.  I didn't do this for the following two reasons:

First, from purely theoretical point of view the name of subroutine is
blob_mimetype(), and I think that charset info has place in Content-Type,
but is not part of MIME type info.  

Second, blob_mimetype() is used in two places: in git_blob_plain
(in "raw" blob view) to generate correct Content-Type HTTP header, and
in git_blob to decide whether a.) blame makes sense, b.) whether to
redirect to "raw" (a=blob_plain) view.  I'd rather not muck with
charset info in second case, although I don't think that it matters
at all, at least for now.


So perhaps best of those ways would be to create thin wrapper subroutine,
blob_contenttype($fd, $file_name, $mimetype), where both $file_name and
(especially) $mimetype are optional parameters, and ise it in
git_blob_plain() subroutine...

> +	# Type specific postprocessing can be added as needed...
> +	if ($mime =~ /^text\//i &&
> +	    $mime !~ /charset=/i && $default_text_plain_charset) {
> +		$mime .=  '; charset='.$default_text_plain_charset;
> +	}
> +
> +	return $mime;

I'm not sure about it.  I worry a bit about text/html, which can, and
usually do, contain charset info inside the document.  I'm not sure
what happens when charset information from HTTP headers contradict
charset information from presented file.  That's why I have limited
adding charset info purely to 'text/plain', not 'text/*' without
charset info already present.

-- 
Jakub Narebski
Poland