git-diff between /dev/null and blob

Currently, due to artifact of git-diff argument parsing you can get diff 
of two arbitrary blobs given by their sha1 id, e.g.
  git diff ab8050ceb4e43522e858768cc2c02fcb91839370 fd05278808d458602587bb024a48726018d30926
but you cannot use git-diff to create diff between two files, or a file
and blob. 

In particular, I couldn't make "creation" patch, i.e. patch between 
/dev/null and specified blob. If it would be possible, we could lose
gitweb.cgi dependency on diff.

-- 
Jakub Narebski
Warsaw, Poland
ShadeHawk on #git