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.\" ========================================================================
.\"
.IX Title "File::MimeInfo::Cookbook 3pm"
.TH File::MimeInfo::Cookbook 3pm "2023-12-06" "perl v5.36.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
File::MimeInfo::Cookbook \- various code snippets
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Some code snippets for non-basic uses of the File::MimeInfo
module:
.IP "\fBMatching an extension\fR" 4
.IX Item "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:
.Sp
.Vb 2
\&  my $extension = \*(Aq*.txt\*(Aq;
\&  my $mimetype = mimetype( $extension );
.Ve
.IP "\fBMimetyping an scalar\fR" 4
.IX Item "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 :
.Sp
.Vb 2
\&  use File::MimeInfo::Magic;
\&  use IO::Scalar;
\&
\&  my $io_scalar = new IO::Scalar \e$data;
\&  my $mimetype = mimetype( $io_scalar );
.Ve
.Sp
In fact most other \f(CW\*(C`IO::\*(C'\fR will work as long as they support the \f(CW\*(C`seek()\*(C'\fR
and \f(CW\*(C`read()\*(C'\fR methods. Of course if you want really obscure things to
happen you can always write your own \s-1IO\s0 object and feed it in there.
.Sp
Be aware that when using a filehandle like this you need to set the \f(CW\*(C`:utf8\*(C'\fR
binmode yourself if appropriate.
.IP "\fBMimetyping a filehandle\fR" 4
.IX Item "Mimetyping a filehandle"
Regrettably for non-seekable filehandles like \s-1STDIN\s0 simply using an \f(CW\*(C`IO::\*(C'\fR
object will not work. You will need to buffer enough of the data for a proper
mimetyping. For example you could mimetype data from \s-1STDIN\s0 like this:
.Sp
.Vb 2
\&  use File::MimeInfo::Magic;
\&  use IO::Scalar;
\&
\&  my $data;
\&  read(STDIN, $data, $File::MimeInfo::Magic::max_buffer);
\&  my $io_scalar = new IO::Scalar \e$data;
\&  my $mimetype = mimetype( $io_scalar );
.Ve
.Sp
Be aware that when using a filehandle like this you need to set the \f(CW\*(C`:utf8\*(C'\fR
binmode yourself if appropriate.
.IP "\fBCreating a new filename\fR" 4
.IX Item "Creating a new filename"
Say you have a temporary file that you want to save with a more
proper filename.
.Sp
.Vb 2
\&  use File::MimeInfo::Magic qw#mimetype extensions#;
\&  use File::Copy;
\&
\&  my $tmpfile = \*(Aq/tmp/foo\*(Aq;
\&  my $mimetype = mimetype($tmpfile);
\&  my $extension = extensions($mimetype);
\&  my $newfile = \*(Aquntitled1\*(Aq;
\&  $newfile .= \*(Aq.\*(Aq.$extension if length $extension;
\&  move($tmpfile, $newfile);
.Ve
.IP "\fBForce the use of a certain database directory\fR" 4
.IX Item "Force the use of a certain database directory"
Normally you just need to add the dir where your mime database lives
to either the \s-1XDG_DATA_HOME\s0 or \s-1XDG_DATA_DIRS\s0 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:
.Sp
.Vb 3
\&  @File::MimeInfo::DIRS = (\*(Aq/home/me/share/mime\*(Aq);
\&  eval \*(Aquse File::MimeInfo\*(Aq;
\&  die if $@;
.Ve
.Sp
or:
.Sp
.Vb 3
\&  use File::MimeInfo;
\&  @File::MimeInfo::DIRS = (\*(Aq/home/me/share/mime\*(Aq);
\&  File::MimeInfo\->rehash();
.Ve
.Sp
This can also be used for switching between databases at run time
while leaving other \s-1XDG\s0 configuration stuff alone.
.SH "AUTHOR"
.IX Header "AUTHOR"
Jaap Karssenberg <pardus@cpan.org>
Maintained by Michiel Beijen <mb@x14.nl>
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
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.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
File::MimeInfo