Lightweight argument parser for scripts run by script_stage(). Supports
named (--key=value) and positional arguments. Values are auto-coerced
to integer, double, or logical when unambiguous.
Usage
get_arg(key, default, type = NULL)
Arguments
- key
Character name (e.g. "x") or integer position (e.g. 1L).
- default
Value to return if the argument is missing. If omitted
and the argument is not found, an error is raised.
- type
Optional type to coerce to: "character", "integer",
"double", "numeric", or "logical". Overrides auto-coercion.
Value
The argument value, coerced to the appropriate type.
Details
When called inside a script_stage() with engine = "source", reads
from injected parameters (via getOption("parade.args")) so scripts
work identically across engines.
Examples
if (FALSE) { # \dontrun{
# In a script:
x <- get_arg("x")
n <- get_arg("n") # auto-coerced to integer
out <- get_arg("output_path")
v <- get_arg("verbose", FALSE) # default if missing
} # }