a bit o' spruce, from http://play.spruce.cf

spruce.json

{"flavor":"1.29.0","prune":["meta"],"env":["HOME=/home/user"],"cherry_pick":[],"yaml":[{"filename":"first.yml","contents":"--- # first.yml\nheres_an_array:\n- first element\n- second element\n- third element\nsome_data: foo\n\n\n"},{"filename":"second.yml","contents":"--- # second.yml\nheres_an_array:\n- (( delete \"second element\" ))\n- (( insert ))\n- blah\nmore_data: 84\n\n"}],"skip_eval":false,"fallback_append":false,"go_patch":false,"debug":false,"trace":false}