directory-tree: A simple directory-like tree datatype, with useful IO functions
A simple directory-like tree datatype, with useful IO functions and Foldable and Traversable instance
Provides a simple data structure mirroring a directory tree on the filesystem, as well as useful functions for reading and writing file and directory structures in the IO monad.
Importing the library and optional (useful) Foldable and Traverable libraries:
import System.Directory.Tree import qualified Data.Foldable as F import qualified Data.Traversable as T
Write a hand-made directory tree of textfiles (strings) to the disk. Simulates creating a new user Tux's home directory on a unix machine:
writeDirectory$ "/home" :/ Dir "Tux" [File "README" "Welcome!"]
"read" a directory by opening all the files at a filepath with readFile, returning an 'AnchoredDirTree String' (d2). Then check for any IO failures:
do (base :/ d2) <- readDirectory "../parent_dir/dir2/" let failed = anyFailed d2 if failed then ...
Use Foldable instance function to concat a directory dir
of text files into a
single file under the same directory:
do (b :/ dt) <- readDirectory dir let f = F.concat dt return$ b :/ File "ALL_TEXT" f
Open all the files in the current directory as lazy bytestrings, ignoring the base path in Anchored wrapper:
import qualified Data.ByteString.Lazy as B do (_ :/ dTree) <- readDirectoryWith B.readFile "./"
This version also offers an experimental function readDirectoryWithL
that does
lazy directory IO, allowing you to treat the returned DirTree
as if it were a
normal lazily-generated data structure.
For example, the following does only the amount of IO necessary to list the file names of the children of the root directory, similar to "ls /":
do d <- readDirectoryWithL readFile "/" mapM_ (putStrLn . name) $ contents $ free d
Any ideas or suggestions for improvements are most welcome :-)
CHANGES: from 0.11
export
System.Directory.Tree.transformDir
as requestedadd test suite to cabal file
remove redundant
removeNonexistent
(thanks to dmwit for patch)
Downloads
- directory-tree-0.12.1.tar.gz [browse] (Cabal source package)
- Package description (as included in the package)
Maintainer's Corner
For package maintainers and hackage trustees
Candidates
- No Candidates
Versions [RSS] | 0.1, 0.1.1, 0.1.2, 0.2.0, 0.2.1, 0.9.0, 0.9.1, 0.10.0, 0.10.1, 0.11.0, 0.12.0, 0.12.1 |
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Dependencies | base (<5), directory (<2), filepath (<2) [details] |
Tested with | ghc <=7.8.2 |
License | BSD-3-Clause |
Copyright | (c) 2011, Brandon Simmons <brandon.m.simmons@gmail.com> |
Author | Brandon Simmons |
Maintainer | Brandon Simmons <brandon.m.simmons@gmail.com> |
Category | Data, System |
Home page | http://brandon.si/code/directory-tree-module-released/ |
Source repo | head: git clone https://github.com/jberryman/directory-tree.git |
Uploaded | by BrandonSimmons at 2016-09-05T17:29:01Z |
Distributions | Debian:0.12.1, FreeBSD:0.12.0, LTSHaskell:0.12.1, NixOS:0.12.1, Stackage:0.12.1 |
Reverse Dependencies | 19 direct, 204 indirect [details] |
Downloads | 37182 total (75 in the last 30 days) |
Rating | 2.25 (votes: 2) [estimated by Bayesian average] |
Your Rating | |
Status | Docs available [build log] Last success reported on 2016-09-05 [all 1 reports] |