path_math {fs}

Path computations

Description

All functions apart from path_real() are purely path computations, so the files in question do not need to exist on the filesystem.

Usage

path_real(path)

path_split(path)

path_join(parts)

path_abs(path, start = ".")

path_norm(path)

path_rel(path, start = ".")

path_common(path)

path_has_parent(path, parent)

Arguments

path

A character vector of one or more paths.

parts

A character vector or a list of character vectors, corresponding to split paths.

start

A starting directory to compute the path relative to.

parent

The parent path.

Value

The new path(s) in an fs_path object, which is a character vector that also has class fs_path. Except path_split(), which returns a list of character vectors of path components.

Functions

• path_real(): returns the canonical path, eliminating any symbolic links and the special references ~, ~user, ., and .., , i.e. it calls path_expand() (literally) and path_norm() (effectively).

• path_split(): splits paths into parts.

• path_join(): joins parts together. The inverse of path_split(). See path() to concatenate vectorized strings into a path.

• path_abs(): returns a normalized, absolute version of a path.

• path_norm(): eliminates . references and rationalizes up-level .. references, so A/./B and A/foo/../B both become A/B, but ../B is not changed. If one of the paths is a symbolic link, this may change the meaning of the path, so consider using path_real() instead.

• path_rel(): computes the path relative to the start path, which can be either an absolute or relative path.

• path_common(): finds the common parts of two (or more) paths.

• path_has_parent(): determine if a path has a given parent.

See Also

path_expand() for expansion of user's home directory.

Examples

dir_create("a")
file_create("a/b")
link_create(path_abs("a"), "c")

# Realize the path
path_real("c/b")

# Split a path
parts <- path_split("a/b")
parts

# Join it together
path_join(parts)

# Find the absolute path
path_abs("..")

# Normalize a path
path_norm("a/../b\\c/.")

# Compute a relative path
path_rel("/foo/abc", "/foo/bar/baz")

# Find the common path between multiple paths
path_common(c("/foo/bar/baz", "/foo/bar/abc", "/foo/xyz/123"))

# Cleanup
dir_delete("a")
link_delete("c")