Resolve the Parquet data repository directory

Resolves the root directory used for Parquet data from an explicit argument or the DATA_DIR environment variable. In an interactive session, when neither is available, the helper asks the user to choose or enter a directory and offers to persist it in either project-level .Renviron or user-level ~/.Renviron.

Usage

dera_data_dir(data_dir = NULL, prompt = interactive(), fallback = ".")

Arguments

data_dir

Optional Parquet data repository root.

prompt

If TRUE, prompt interactively when data_dir and DATA_DIR are both missing.

fallback

Directory returned when prompting is disabled and no explicit or environment value is available.

Value

A directory path as a character string.