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This library abstracts reading configuration files so that there is a single interface for reading but multiple backwards to pull values from. Current supported backends are

• envProvider: EnvProvider which reads from environment variables and .env files
• jsonProvider: JsonProvider which reads from a JSON file
• TomlProvider which reads from a TOML file

Example:

import scrolls
import std/[envvars, json, options]

# Usually you'd set environment variables before you start the program...
putenv("ENV_EXAMPLE", "true")

# You'll need to make a reader with all the providers you want.
# These providers are read in order
let reader = initConfigurationReader(
  newEnvProvider(), # We want environment variables to have highest priority
  newJsonProvider(
    %*{ # We use hard coded values, but could use a JSON config file
      "json": {"example": "hello"}
    }
  ),
)

assert reader.get("env.example", bool).get() # It can parse types
assert reader.get("json.example", string).get() == "hello" # Handles fall through
assert reader.get("doesnt.exist", string).isNone()