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

spruce.json

{"flavor":"1.11.0","prune":["meta"],"env":["HOME=/home/user"],"cherry_pick":[],"yaml":[{"filename":"first.yml","contents":"--- # first.yml\nsome_data: this will be overwritten later\na_random_map:\n  key1: some data\nheres_an_array:\n- first element\n\n\n\n"},{"filename":"second.yml","contents":"--- # second.yml\nsome_data: 42dfgfg\na_random_map:\n  key2: adding more data\nheres_an_array:\n- (( prepend ))\n- zeroth element\nmore_data: 84dfdf\n\n\n\n"}],"skip_eval":false,"fallback_append":false,"go_patch":false,"debug":false,"trace":false}