dream2nix/src/utils/config.nix

let

  b = builtins;

  # loads attrs either from s:
  #   - json file
  #   - json string
  #   - attrset (no changes)
  loadAttrs = input:
    if b.isPath input then
      b.fromJSON (b.readFile input)
    else if b.isString input then
      b.fromJSON input
    else if b.isAttrs input then
      input
    else
      throw "input for loadAttrs must be json file or string or attrs";
  
  # load dream2nix config extending with defaults
  loadConfig = configInput:
    let
      config = loadAttrs configInput;
      defaults =  {
        overridesDirs = [];
        packagesDir = null;
        repoName = "this repo";
      };
    in
      defaults // config;

in
{
  inherit loadConfig;
}