credentials_extract: Extract information from a credentials file
In joebrew/cism: The CISM R package

Extract information from a credetials.yaml so as to access a CISM database. This will generally used in conjunction with credentials_connect The list generated by credentials_extract is passed as the options_list argument of credentials_connect).

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credentials_extract(credentials_path = NULL, credentials_folder = TRUE,
  credentials_file = "credentials.yaml", credentials_search_limit = 10,
  all_in_file = FALSE)

`credentials_path`	The path to a credentials file through which the database connection will be established. If `NULL` the function will attempt to find an `credentials.yaml` upwards in the directory tree
`credentials_folder`	Whether to search for a `credentials` folder (the default behvior); only applicable if `credentials_path` is `NULL`.
`credentials_file`	The name of the file (not including the path, unless `all_in_file` is set to `TRUE`) with your environment setting. Normally, this should be `credentials.yaml`. If an explicit `credentials_path` is provided, this argument is ignored. Otherwise, the `credentials_file` will be searched for, with the expectation that it is in a directory named `credentials`.
`credentials_search_limit`	The number of directories upwards to search for a `credentials/credentials.yaml` file; only relevant if `credentials_path = NULL` default is `FALSE`
`all_in_file`	Whether to disregard the `credentials_path` argument entirely. If set to `TRUE`, the `credentials_file` argument should be the entire pathway to the credentials file in question (ie, path and file name) combined. If set to `TRUE`, the function will use the