requireVariable {tinyProject}

Ask user the value of a variable

Description

In interactive mode, this functions asks the user to type the value of a given variable. In non-interactive mode, it searchs the value in the command line arguments and it returns an error if the value does not exist.

Usage

requireVariable(name, desc = NULL, default = NULL,
  what = character(), nmax = 1, alwaysAsk = TRUE, env = .GlobalEnv)

Arguments

name

Name of the required variable

desc

Description to display

default

Default value for the variable

what

Type of data to read in interactive mode.

nmax

Number of values to read in interactive mode.

alwaysAsk

If the variable already exists, should the function ask a new value?

env

Environment where the variable should be defined

Value

Used for side effects