ytt

I once tried to find a simple standalone interpreter to play with and couldn't. There is a list of projects that use Starlark at https://github.com/bazelbuild/starlark#users. It lists https://github.com/carvel-dev/ytt for YAML templating and https://github.com/jathu/starfig for generating JSON and YAML configs. (I have not used either.)

agreed, text templating of yaml (or any structured content) does not make sense. too much context (actual config structure) is lost if plain text is used. i've collaborated on ytt (https://get-ytt.io) - yaml templating tool. it works directly with yaml structure to bind templating directives. for example setting a value is associated with a specific yaml node so that you dont have to do any manual indenting etc. like you would with plain text templating. defining functions that return yaml structures becomes very easy as well. common problems such as improperly escaped values are gone. i'm also experimenting with a "strict" mode [1] that raises error for questionable yaml features, for example, using NO to mean false. i think that yaml is here to stay (at least for some time) and it's worth investing in making tools that make dealing wit

i'll throw in one of my projects as a contender: ytt - YAML templating tool - https://get-ytt.io (check out live playground!). it works with yaml structures (hence avoids text templating problems) and uses familiar python-like language, starlark, making quite easy to get started. it makes use of yaml comments to assign metadata/templating directives to yaml nodes, so it looks something like this: #@ load("@ytt:data", "data") #@ def labels(): app: echo org: test #@ end kind: Pod apiVersion: v1 metadata: name: echo-app labels: #@ labels() spec: containers: #@ for/end echo in data.values.echos: - name: #@ echo.name image: hashicorp/http-echo args: - #@ "-text=" + echo.text it doesn't include type checking, however, it does have a system to "overlay" structures on top of each other vi