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

spruce.json

{"flavor":"1.17.0","prune":["meta"],"env":["HOME=/home/user"],"cherry_pick":[],"yaml":[{"filename":"mjolnir.yml","contents":"--- # mjolnir.yml\ntmp:\n  F57E0D07: ((keys config.boshrelease.dependencies))\n  4EC4: (( concat \"[\" config.site.abbreviation \"]\" ))\n"},{"filename":"file2.yml","contents":"---\nmeta:\n  passed: (( cartesian-product tmp.F57E0D07 \"dev\"))\n\n"},{"filename":"file3.yml","contents":"---\nconfig:\n  site:\n    abbreviation: dev\n  boshrelease:\n    dependencies:\n      haproxy: yup\n      monitoring: also\n\n"}],"skip_eval":false,"fallback_append":false,"go_patch":false,"debug":false,"trace":false}