s c h e m a t i c s : c o o k b o o k

/ FileAndDirectoryRecipes? / Cookbook.FileIsADirectory

This Web


WebHome 
WebChanges 
TOC (with recipes)
NewRecipe 
WebTopicList 
WebStatistics 

Other Webs


Chicken
Cookbook
Erlang
Know
Main
Plugins
Sandbox
Scm
TWiki  

Schematics


Schematics Home
Sourceforge Page
SchemeWiki.org
Original Cookbook
RSS

Scheme Links


Schemers.org
Scheme FAQ
R5RS
SRFIs
Scheme Cross Reference
PLT Scheme SISC
Scheme48 SCM
MIT Scheme scsh
JScheme Kawa
Chicken Guile
Bigloo Tiny
Gambit LispMe
GaucheChez

Lambda the Ultimate
TWiki.org

Testing Whether A File Is A Directory

Problem

You have a list of file names, which includes the names of some directories. You want to test if a name refers to a file or directory.

Solution

There are two predicates that are useful here: file-exists?, which returns #t if a file name corresponds to a file, but not to a directory, and directory-exists?, which returns #t if a file name corresponds to a directory, but not to a file. You can use directory-exists? with directory-list and filter to create a list of file names that correspond only to directories:

500 Can't connect to 127.0.0.1:8778 (connect: Connection refused)

Discussion


Comments about this recipe

Contributors

-- NoelWelsh - 14 May 2004

CookbookForm
TopicType: Recipe
ParentTopic: FileRecipes
TopicOrder:

 
 
Copyright © 2004 by the contributing authors. All material on the Schematics Cookbook web site is the property of the contributing authors.
The copyright for certain compilations of material taken from this website is held by the SchematicsEditorsGroup - see ContributorAgreement & LGPL.
Other than such compilations, this material can be redistributed and/or modified under the terms of the GNU Lesser General Public License (LGPL), version 2.1, as published by the Free Software Foundation.
Ideas, requests, problems regarding Schematics Cookbook? Send feedback.
/ You are Main.guest