assert_file_does_not_exist | R Documentation |
Assert that a file does not exist. Useful for avoiding overwriting.
assert_file_does_not_exist(
x,
msg = NULL,
call = rlang::caller_env(),
arg_name = NULL
)
x |
Path to a file (string) |
msg |
A character string containing the error message if file |
call |
Only relevant when pooling assertions into multi-assertion helper functions. See cli_abort for details. |
arg_name |
Advanced use only. Name of the argument passed (default: NULL, will automatically extract arg_name). |
invisible(TRUE) if file x
does not exist, otherwise aborts with the error message specified by msg
real_file <- system.file("DESCRIPTION", package = "assertions")
try({
assert_file_does_not_exist("foo") # Passes
assert_file_does_not_exist(real_file) # Throws error
assert_file_does_not_exist(c("foo", "bar")) # Throws Error (single file only)
})
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