Inspired by the dockerize template library, GTE is a go template engine based on the golang template package and the go-jmespath library (JMESPath is a query language for JSON).

gte [options] template destination [template destination]...

-n --no-overwrite
    Do not overwrite destination file if it already exists.
-d --delims
    template tag delimiters. default "{{":"}}"

Arguments:

template - the template. Can be passed multiple times together with destination as an ordered pair (2-tuple). Does also support directories.
destination - the destination . Can be passed multiple times together with destination as an ordered pair (2-tuple). Does also support directories.

Generate test.conf using test.tmpl as a template.

gte test.tmpl /etc/test/test.conf

content template test.tmpl:

#Begin Config

json:
{{ jsonQuery `{"cc":{"servers":[{"host":"aa","port":1001},{"host":"bb","port":1002},{"host":"cc","port":1003}]}}` `-i2 cc.servers[*]` }}

#End Config

generated test.conf:

#Begin Config

json:
[
  {
    "host": "aa",
    "port": 1001
  },
  {
    "host": "bb",
    "port": 1002
  },
  {
    "host": "cc",
    "port": 1003
  }
] 

#End Config

{{ jsonQuery \`json-source\` \`[options] jmespath\` }} 

e.g. `{"host": "10.0.0.1"}`
e.g. .Env.VCAP_SERVICES (json in environment variable)

e.g. `host`
e.g. `services[0].host`
e.g. `services[?host=='10.0.0.1']`

(none)
output rendered as inline json

-iNUM
intend json output with the defined number of spaces, e.g. -i5

-y
yaml output