First, thanks again for making this plugin.

I don't know if this is a problem for [[plugins/attachment]], but there seems to
be no way to detect text/plain using File::MimeInfo::Magic::magic().
There is a heuristic ::default that decides between text/plain and application/octet-stream.  

Would you be receptive to a patch that e.g. called File::MimeInfo::Magic::default()
if ::magic() returns undef?  --[[DavidBremner]]

> Yes, that looks to be ok. --[[Joey]]

>> OK, here is such a patch. One modification of previous behaviour is that 
>> that if default returns undef, this is returned. As far as I understand
>> the code/doc for File::MimeInfo, under is used only as an error return
>> for ::default
<pre>
From 84f40d7fa822c6cc09506cca2dbf38a8b19f8bb7 Mon Sep 17 00:00:00 2001
From: David Bremner <bremner@unb.ca>
Date: Fri, 29 Aug 2008 20:46:20 -0300
Subject: [PATCH] call File::MimeInfo::default if ::magic() returns undef

---
 IkiWiki/Plugin/filecheck.pm |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/IkiWiki/Plugin/filecheck.pm b/IkiWiki/Plugin/filecheck.pm
index 9c7a8db..a94c02b 100644
--- a/IkiWiki/Plugin/filecheck.pm
+++ b/IkiWiki/Plugin/filecheck.pm
@@ -127,7 +127,7 @@ sub match_mimetype ($$;@) { #{{{
        }
        my $mimetype=File::MimeInfo::Magic::magic($file);
        if (! defined $mimetype) {
-               $mimetype="unknown";
+               $mimetype=File::MimeInfo::Magic::default($file);
        }

        my $regexp=IkiWiki::glob2re($wanted);
--
1.5.6.3
</pre>