Came across fsql, which does SQL-like filesystem queries (an intriguing idea):

fsql SELECT name FROM ~/Desktop, ~/Downloads WHERE name LIKE %csc%

fsql SELECT all FROM ~ WHERE file IS dir

fsql "name, size, time FROM . WHERE name LIKE %.js AND time > 'Apr 01 2017 00 00'"

fsql "FROM $GOPATH WHERE name = main.go AND (size >= 10.5kb OR size < 100)"

I like it.