Check if a path is suited for creating an output file

Check if a file path can be used safely to create a file and write to it.

This is checked:

• Does dirname(x) exist?

• Does no file under path x exist?

• Is dirname(x) writable?

Paths are relative to the current working directory.

Usage

checkPathForOutput(x, overwrite = FALSE, extension = NULL)

check_path_for_output(x, overwrite = FALSE, extension = NULL)

assertPathForOutput(
  x,
  overwrite = FALSE,
  extension = NULL,
  .var.name = vname(x),
  add = NULL
)

assert_path_for_output(
  x,
  overwrite = FALSE,
  extension = NULL,
  .var.name = vname(x),
  add = NULL
)

testPathForOutput(x, overwrite = FALSE, extension = NULL)

test_path_for_output(x, overwrite = FALSE, extension = NULL)

expect_path_for_output(
  x,
  overwrite = FALSE,
  extension = NULL,
  info = NULL,
  label = vname(x)
)

Arguments

x

[any]
Object to check.

overwrite

[logical(1)]
If TRUE, an existing file in place is allowed if it it is both readable and writable. Default is FALSE.

extension

[character(1)]
Extension of the file, e.g. “txt” or “tar.gz”.

.var.name

[character(1)]
Name of the checked object to print in assertions. Defaults to the heuristic implemented in vname.

add

[AssertCollection]
Collection to store assertion messages. See AssertCollection.

info

[character(1)]
Extra information to be included in the message for the testthat reporter. See expect_that.

label

[character(1)]
Name of the checked object to print in messages. Defaults to the heuristic implemented in vname.

Value

Depending on the function prefix: If the check is successful, the functions assertPathForOutput/assert_path_for_output return x invisibly, whereas checkPathForOutput/check_path_for_output and testPathForOutput/test_path_for_output return TRUE. If the check is not successful, assertPathForOutput/assert_path_for_output throws an error message, testPathForOutput/test_path_for_output returns FALSE, and checkPathForOutput/check_path_for_output return a string with the error message. The function expect_path_for_output always returns an expectation.

See also

Other filesystem: checkAccess(), checkDirectoryExists(), checkFileExists()

Examples

# Can we create a file in the tempdir?
testPathForOutput(file.path(tempdir(), "process.log"))
#> [1] TRUE