/usr/share/doc/xxdiff-scripts/examples/git/xxdiff-git is in xxdiff-scripts 1:4.0.1+dfsg-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | #!/bin/sh
# diff is called by git with 7 parameters:
#echo path old-file old-hex old-mode new-file new-hex new-mode
# essential: /opt/local/bin/xxdiff -w --title1="revision\ $3" --title2="$5" "$2" "$5" | cat
xxdiff -w --title1="revision\ $3" --title2="$5" "$2" "$5" | cat
#xxdiff -w --style platinum --textfont 'Bitstream Vera Sans Mono,11,-1,5,50,0,0,0,0,0' --title1="revision\ $3" --title2="$5" "$2" "$5" | cat
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