Thomas Burg wrote:

> I am struggling at comparing xml file (vim -d file1.xml file2.xml). Usual GNU 
> diff does not produce useful data. So I am looking to use my custom and 
> structure aware diff tool with vim. Because viewing difference is still a 
> concern and vim allow to do that.
> 
> So I follow the manual notes and put following lines in my .vimrc:
> 
> set diffexpr=MyDiff()
> 
> function MyDiff()
>   silent execute '!my_custom_diff '. v:fname_in . ' ' . v:fname_new . ' > ' 
> .v:fname_out
> endfunction
> 
> But all my trial finish by "E97: Cannot create diffs" message. While 
> my_custom_diff in standalone produce an output compatible to what GNU diff 
> can produce...
> I end up to search this message in the vim source code and found that vim 
> prior to run the diff on user's files is performing a sanity check of the 
> diff command with pattern: "line1\n" compare to "line2\n" (source code 
> comment refer to "quick test") 
> My custom tool is unable to produce the expected result since it must run 
> exclusively on xml file.
> 
> I did not found any way to bypass this "quick test". Is there a way ?
> Is my use case valid ? I mean the usage of a diff tool not correctly 
> answering to the "quick test" procedure ?

There is no way around it.  Can't you make your diff command produce the
expected output?

-- 
One difference between a man and a machine is that a machine is quiet
when well oiled.

 /// Bram Moolenaar -- [email protected] -- http://www.Moolenaar.net   \\\
///        sponsor Vim, vote for features -- http://www.Vim.org/sponsor/ \\\
\\\  an exciting new programming language -- http://www.Zimbu.org        ///
 \\\            help me help AIDS victims -- http://ICCF-Holland.org    ///

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