How to match once per file in grep?

Question

Is there any grep option that let\'s me control total number of matches but stops at first match on each file?

Example:

If I do this grep -ri --include \'*

Answer 1

using find and xargs. find every .coffee files and excute -m1 grep to each of them

find . -print0 -name '*.coffee'|xargs -0 grep -m1 -ri 're'

test without -m1

linux# find . -name '*.txt'|xargs grep -ri 'oyss'
./test1.txt:oyss
./test1.txt:oyss1
./test1.txt:oyss2
./test2.txt:oyss1
./test2.txt:oyss2
./test2.txt:oyss3

add -m1

linux# find . -name '*.txt'|xargs grep -m1 -ri 'oyss'
./test1.txt:oyss
./test2.txt:oyss1