Table of Content:
Introduction
The path:
module provides functions for manipulating and testing filesystem
paths.
Function usages are given in the same format as in the reference doc for the builtin module.
Variables
$path:dev-null
OS-specific path to the “null” device (/dev/null
on Unix and NUL
on
Windows).
$path:dev-tty
OS-specific path to the terminal device (/dev/tty
on Unix and CON
on
Windows).
$path:list-separator
OS-specific path list separator. Colon (:
) on Unix and semicolon (;
) on
Windows. This variable is read-only.
$path:separator
OS-specific path separator. Forward slash (/
) on Unix and backslash (\
)
on Windows. This variable is read-only.
Functions
path:abs
path:abs $path
Outputs $path
converted to an absolute path.
~> cd ~
~> path:abs bin
▶ /home/user/bin
path:base
path:base $path
Outputs the last element of $path
. This is analogous to the POSIX basename
command. See the
Go documentation for more details.
~> path:base ~/bin
▶ bin
path:clean
path:clean $path
Outputs the shortest version of $path
equivalent to $path
by purely lexical processing. This
is most useful for eliminating unnecessary relative path elements such as .
and ..
without
asking the OS to evaluate the path name. See the Go
documentation for more details.
~> path:clean ./../bin
▶ ../bin
path:dir
path:dir $path
Outputs all but the last element of $path
, typically the path’s enclosing directory. See the
Go documentation for more details. This is analogous to
the POSIX dirname
command.
~> path:dir /a/b/c/something
▶ /a/b/c
path:eval-symlinks
path:eval-symlinks $path
Outputs $path
after resolving any symbolic links. If $path
is relative the result will be
relative to the current directory, unless one of the components is an absolute symbolic link.
This function calls path:clean
on the result before outputting it. This is analogous to the
external realpath
or readlink
command found on many systems. See the Go
documentation for more details.
~> mkdir bin
~> ln -s bin sbin
~> path:eval-symlinks ./sbin/a_command
▶ bin/a_command
path:ext
path:ext $path
Outputs the file name extension used by $path
(including the separating period). If there is no
extension the empty string is output. See the Go
documentation for more details.
~> path:ext hello.elv
▶ .elv
path:is-abs
path:is-abs $path
Outputs $true
if the path is an absolute path. Note that platforms like Windows have different
rules than Unix like platforms for what constitutes an absolute path. See the Go
documentation for more details.
~> path:is-abs hello.elv
▶ false
~> path:is-abs /hello.elv
▶ true
path:is-dir
path:is-dir &follow-symlink=$false $path
Outputs $true
if the path resolves to a directory. If the final element of the path is a
symlink, even if it points to a directory, it still outputs $false
since a symlink is not a
directory. Setting option &follow-symlink
to true will cause the last element of the path, if
it is a symlink, to be resolved before doing the test.
~> touch not-a-dir
~> path:is-dir not-a-dir
▶ false
~> path:is-dir /tmp
▶ true
See also path:is-regular
.
path:is-regular
path:is-regular &follow-symlink=$false $path
Outputs $true
if the path resolves to a regular file. If the final element of the path is a
symlink, even if it points to a regular file, it still outputs $false
since a symlink is not a
regular file. Setting option &follow-symlink
to true will cause the last element of the path,
if it is a symlink, to be resolved before doing the test.
Note: This isn’t named is-file
because a Unix file may be a “bag of bytes” or may be a
named pipe, device special file (e.g. /dev/tty
), etc.
~> touch not-a-dir
~> path:is-regular not-a-dir
▶ true
~> path:is-regular /tmp
▶ false
See also path:is-dir
.
path:join
path:join $path-component...
Joins any number of path elements into a single path, separating them with an OS specific separator. Empty elements are ignored. The result is cleaned. However, if the argument list is empty or all its elements are empty, Join returns an empty string. On Windows, the result will only be a UNC path if the first non-empty element is a UNC path.
~> path:join home user bin
▶ home/user/bin
~> path:join $path:separator home user bin
▶ /home/user/bin
path:temp-dir
path:temp-dir &dir='' $pattern?
Creates a new directory and outputs its name.
The &dir option determines where the directory will be created; if it is an
empty string (the default), a system-dependent directory suitable for storing
temporary files will be used. The $pattern
argument determines the name of
the directory, where the last star will be replaced by a random string; it
defaults to elvish-*
.
It is the caller’s responsibility to remove the directory if it is intended to be temporary.
~> path:temp-dir
▶ /tmp/elvish-RANDOMSTR
~> path:temp-dir x-
▶ /tmp/x-RANDOMSTR
~> path:temp-dir 'x-*.y'
▶ /tmp/x-RANDOMSTR.y
~> path:temp-dir &dir=.
▶ elvish-RANDOMSTR
~> path:temp-dir &dir=/some/dir
▶ /some/dir/elvish-RANDOMSTR
path:temp-file
path:temp-file &dir='' $pattern?
Creates a new file and outputs a file object opened for reading and writing.
The &dir option determines where the file will be created; if it is an
empty string (the default), a system-dependent directory suitable for storing
temporary files will be used. The $pattern
argument determines the name of
the file, where the last star will be replaced by a random string; it
defaults to elvish-*
.
It is the caller’s responsibility to close the file with
file:close
. The caller should also remove the file
if it is intended to be temporary (with rm $f[name]
).
~> var f = (path:temp-file)
~> put $f[name]
▶ /tmp/elvish-RANDOMSTR
~> echo hello > $f
~> cat $f[name]
hello
~> var f = (path:temp-file x-)
~> put $f[name]
▶ /tmp/x-RANDOMSTR
~> var f = (path:temp-file 'x-*.y')
~> put $f[name]
▶ /tmp/x-RANDOMSTR.y
~> var f = (path:temp-file &dir=.)
~> put $f[name]
▶ elvish-RANDOMSTR
~> var f = (path:temp-file &dir=/some/dir)
~> put $f[name]
▶ /some/dir/elvish-RANDOMSTR