file::mimeinfo::cookbook(3pm) [debian man page]

File::MimeInfo::Cookbook(3pm)				User Contributed Perl Documentation			     File::MimeInfo::Cookbook(3pm)

NAME

       File::MimeInfo::Cookbook - various code snippets

DESCRIPTION

       Some code snippets for non-basic uses of the File::MimeInfo module:

       Matching an extension
	   A file does not have to actually exist in order to get a mimetype for it. This means that the following will work:

	     my $extension = '*.txt';
	     my $mimetype = mimetype( $extension );

       Mimetyping an scalar
	   If you want to find the mimetype of a scalar value you need magic mimetyping; after all a scalar doesn't have a filename or inode.
	   What you need to do is to use IO::Scalar :

	     use File::MimeInfo::Magic;
	     use IO::Scalar;

	     my $io_scalar = new IO::Scalar $data;
	     my $mimetype = mimetype( $io_scalar );

	   In fact most other "IO::" will work as long as they support the "seek()" and "read()" methods. Of course if you want really obscure
	   things to happen you can always write your own IO object and feed it in there.

	   Be aware that when using a filehandle like this you need to set the ":utf8" binmode yourself if apropriate.

       Mimetyping a filehandle
	   Regrettably for non-seekable filehandles like STDIN simply using an "IO::" object will not work. You will need to buffer enough of the
	   data for a proper mimetyping. For example you could mimetype data from STDIN like this:

	     use File::MimeInfo::Magic;
	     use IO::Scalar;

	     my $data;
	     read(STDIN, $data, $File::MimeInfo::Magic::max_buffer);
	     my $io_scalar = new IO::Scalar $data;
	     my $mimetype = mimetype( $io_scalar );

	   Be aware that when using a filehandle like this you need to set the ":utf8" binmode yourself if apropriate.

       Creating a new filename
	   Say you have a temporary file that you want to save with a more proper filename.

	     use File::MimeInfo::Magic qw#mimetype extensions#;
	     use File::Copy;

	     my $tmpfile = '/tmp/foo';
	     my $mimetype = mimetype($tmpfile);
	     my $extension = extensions($mimetype);
	     my $newfile = 'untitled1';
	     $newfile .= '.'.$extension if length $extension;
	     move($tmpfile, $newfile);

       Force the use of a certain database directory
	   Normally you just need to add the dir where your mime database lives to either the XDG_DATA_HOME or XDG_DATA_DIRS environment variables
	   for it to be found. But in some rare cases you may want to by-pass this system all together. Try one of the following:

	     @File::MimeInfo::DIRS = ('/home/me/share/mime');
	     eval 'use File::MimeInfo';
	     die if $@;

	   or:

	     use File::MimeInfo;
	     @File::MimeInfo::DIRS = ('/home/me/share/mime');
	     File::MimeInfo->rehash();

	   This can also be used for switching between databases at run time while leaving other XDG configuration stuff alone.

AUTHOR

       Jaap Karssenberg <pardus@cpan.org>

       Copyright (c) 2005, 2012 Jaap G Karssenberg. All rights reserved.  This program is free software; you can redistribute it and/or modify it
       under the same terms as Perl itself.

SEE ALSO

       File::MimeInfo

perl v5.14.2							    2012-01-05					     File::MimeInfo::Cookbook(3pm)