is_file: Check file paths and directories

In ChadGoymer/msgr: Extends Messages, Warnings and Errors by Adding Levels and Log Files

Description

These functions check whether the directories or files exist and whether the current user has read or write permissions. If a character vector is supplied each element is checked, returning a logical vector of the same length.

Usage

is_file(x)

is_dir(x)

is_readable(x)

is_writeable(x)

is_url(x)

Arguments

x	(any) The object to test

Value

TRUE if x is a path to an existing directory, FALSE otherwise

Examples

is_dir(tempdir())
is_dir("/does/not/exist")

tmpfile <- tempfile()
file.create(tmpfile)

is_file(tmpfile)
is_file("/does/not/exist.txt")

is_readable(tmpfile)
is_readable("/does/not/exist.txt")

is_writeable(tmpfile)
is_writeable("/does/not/exist.txt")

is_url("http://something.com")
is_url("https://google.com")
is_url(c("http://something.com", "https://google.com"))

is_url(1)
is_url("foo")
is_url(NA)

ChadGoymer/msgr documentation built on April 10, 2021, 10:31 a.m.