diff a directory recursively, ignoring all binary files

Kind of cheating but here's what I used:

diff -r dir1/ dir2/ | sed '/Binary\ files\ /d' >outputfile

This recursively compares dir1 to dir2, sed removes the lines for binary files(begins with "Binary files "), then it's redirected to the outputfile.

Maybe use grep -I (which is equivalent to grep --binary-files=without-match) as a filter to sort out binary files.

dir1='folder-1'
dir2='folder-2'
IFS=$'\n'
for file in $(grep -Ilsr -m 1 '.' "$dir1"); do
   diff -q "$file" "${file/${dir1}/${dir2}}"
done