Smart diff handler / open files from the GUI

Hi guys, I started using unison over 10 years ago and fell out of using it 
as my habits changed.  I'm back to using it as a way to synchronize my 
desktop and mobile home folders. 

Being that this involves a wide array of file types, are there any smart 
diff utilities, or handlers that look at file header and/or mime type to 
determine a suitable merge strategy? A good companion script is what I 
think I'm looking for. 

Along that same line, It would be handy to be able to open a file from the 
gui interface to inspect it before deciding what action to take. 
Spreadsheet files are particularly problematic. 

I defined a quasi merge solution that is not ideal. 

merge = Name {*} -> xdg-open CURRENT1 & xdg-open CURRENT2

If I place that before my other defined merge strategies it will open both 
files with whatever the default program is for that filetype. It's not 
safe, I do not recommend using it. But it does work well on spreadsheet 
files, both allowing me to inspect them and manually complete a merge at 
the same time. Not all gui programs are created equal though, and while the 
sync will pause when LibreOffice is launched, some file types will open in 
a herd and unison has no chance to inspect output files.

Since it's not documented, I thought that I would share that to save a 
merged file, prepend the string `.unison-mergenew1-`

As my intention was to inspect the file before deciding what to do, my 
first attempt was to define the diff command as such.

diff = xdg-open
diff = xdg-open CURRENT1 & xdg-open CURRENT2

Neither of these worked. The first because xdg-open only accepts one 
argument. The second I am not sure, but suspect CURRENT1&2 are not valid 
variables. 

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