assert_file_has_extension: Assert file extensions

In assertions: Simple Assertions for Beautiful and Customisable Error Messages

Assert file extensions

Description

Assert that a filepath includes one of the selected extensions. Does not require file to actually exist.

Usage

assert_file_has_extension(
  x,
  extensions,
  compression = FALSE,
  msg = NULL,
  call = rlang::caller_env(),
  arg_name = NULL
)

Arguments

x	An object
extensions	valid extensions (character vector). Do not include the '.', e.g. supply extensions = 'txt' not extensions = '.txt'
compression	should compression extension ‘.gz’, ‘.bz2’ or ‘.xz’ be removed first?
msg	A character string containing the error message if file x does not have the specified extensions
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).

Value

invisible(TRUE) if x has any of the specified extensions, otherwise aborts with the error message specified by msg

Examples

try({
assert_file_has_extension("foo.txt", extensions = "txt") # Passes
assert_file_has_extension("file.txt", extensions = "csv") # Throws Error
})

assertions documentation built on April 3, 2025, 5:52 p.m.