code: purgatorio

ref: f4624471579e0cfb531ffc733cdbe007ecdfed9d
dir: /man/2/names/

.TH NAMES 2
.SH NAME
Names: basename, cleanname, dirname, elements, isprefix, pathname, relative, rooted \- file name manipulation
.SH SYNOPSIS
.EX
include "names.m";
names := load Names Names->PATH;

basename:  fn(name: string, suffix: string): string;
cleanname: fn(name: string): string;
dirname:   fn(name: string): string;
elements:  fn(name: string): list of string;
isprefix:  fn(a: string, b: string): int;
pathname:  fn(els: list of string): string;
relative:  fn(name: string, root: string): string;
rooted:    fn(root: string, name: string): string;
.EE
.SH DESCRIPTION
.B Names
provides operations on file names (path names):
.TF cleanname
.PD
.TP
.B basename
Return the trailing component of
.I name
(the text after the final
.LR / ),
shorn of
.I suffix
(which may be null).
.TP
.B cleanname
Return a `cleaner' version of
.IR name :
there are no redundant and trailing slashes,
and directory names
.L .
and
.L ..
have been interpreted lexically.
If the result would otherwise be the empty string,
the name
.L .
is returned instead.
.TP
.B dirname
Return the directory component of
.IR name :
the string up to but not including the final slash(es).
.TP
.B elements
Return a list of the path elements of
.IR name :
the words between slashes.
If
.I name
starts with a
.LR / ,
the head of the list will be the string
\&\f5"/"\fP
but otherwise slashes do not appear.
.TP
.B pathname
Return a path name formed from a list of elements as produced by
.BR elements .
.TP
.B isprefix
Return true iff path name
.I a
is a prefix of path name
.IR b .
.TP
.B relative
If
.I name
is
.IB root / X
for some
.IR X ,
return
.IR X ;
otherwise return
.I name
unchanged.
.TP
.B rooted
Return the path name for
.I name
relative to a given
.I root
directory (either name may be nil).
If
.I name
itself starts with
.L /
or
.LR # ,
the result is
.IR name ;
otherwise it is
.IB root / name.
.PP
See
.IR sys-intro (2)
for details of file name syntax and its interpretation.
.SH SOURCE
.B /appl/lib/names.b
.SH SEE ALSO
.IR sys-intro (2),
.IR sys-fd2path (2),
.IR workdir (2)