Dirty script to get diff in more systematic manner (without noise) for AST

git_diff_only_changes.sh

git diff <hash-commit-1>:<fillename> <hash-commit-1>:<filename> |  gawk 'match($0,"^@@ -([0-9]+),[0-9]+ [+]([0-9]+),[0-9]+ @@",a){left=a[1];right=a[2];next}
   /^(---|\+\+\+|[^-+ ])/{print;next};\
   {line=substr($0,2)};\
   /^-/{print "-" left++ ":" line;next};\
   /^[+]/{print "+" right++ ":" line;next};\
   {print "(" left++ "," right++ "):"line}' | grep -v '^+++' | grep -v '^---' | grep -v 'diff' | grep -v 'index'