Create a fallback — fallback • fallback

Creates a fallback that can be evaluated with resolve_fallback().

Usage

fallback(terminal_fallback_value, source_file = "config.yaml",
  hierarchy = c("./", "~/"), key = NULL)

Arguments

terminal_fallback_value: The value the fallback will resolve to when no other instance in the hierarchy defines the key.
hierarchy, source_file: Define the paths to the yaml files where we look for a key to be defined. By default, it is a file called config.yaml in the working directory and the home directory.
key: The key, that is, the name of the argument the fallback is created for. Can be NULL, so the definition of the key is deferred until resolve_fallback() is called to avoid redundancy.

Examples

fallback(TRUE)
#> <fallback>
#> key                     
#> value                   
#> hierarchy               ./ -> ~/
#> terminal fallback value TRUE ... 
#> source file             fallbacks.yaml