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kotlinlang

Is there any way to change a subset of variables in config depending on environment?

What I'd like is something like

```
application.conf
    variable1: value1
    variable2: value2

application-dev.conf
    variable3: value3
```

And be able to run the application with both `application.conf` and `application-dev.conf` applied. Or possibly 1 config file but evaluate different configs depending on environment variables. When reading up on `HOCON` I couldn't find it it supports any kind of ternary operator or so.

You could just pass in another config in the command line <https://ktor.io/servers/configuration.html#command-line>

You can load Hocon by hand, too: if you pass in `-Dconfig.file=application.conf` it will load in `reference.conf` and then merge `application.conf` onto it
And then you can instance your server like
```
val hoconConfig = ConfigFactory.load().resolve()
server = embeddedServer(YourEngine, applicationEngineEnvironment {
config = HoconApplicationConfig(hoconConfig)
}).start()
```