Get an specific argument from the command line

Usage

.get_command_argument(
  x,
  argument,
  prefix = "--",
  default = FALSE,
  verbose = FALSE
)

Arguments

x: The command line arguments, from x = commandArgs()
argument: The name of the argument.
prefix: The prefix to any argument of interest, the default is "–"
default: Default value to return is argument is missing, default to FALSE.
verbose: Boolean, if TRUE, shows a warning when the parameter is not found.

Value

The value of the argument, assumed to be followed after '=' or, TRUE if nothing but the argument was found. If the argument is not found, FALSE is returned.

Examples

.get_command_argument(commandArgs(), "interactive")
#> [1] FALSE
.get_command_argument(commandArgs(), "RStudio")
#> [1] FALSE
.get_command_argument(commandArgs(), "RStudio", prefix="")
#> [1] FALSE
.get_command_argument(commandArgs(), "vanilla")
#> [1] FALSE
.get_command_argument("--control.file=baz.txt", "control.file")
#> [1] "baz.txt"