Haskell中有一些目录漫游者吗？ [英] Is there some directory walker in Haskell?

问题描述

Haskell中是否有一些递归目录漫游器，所以我可以编写类似

Is there some recursive directory walker in Haskell so I could write something like

listing <- walkDir "/tmp"

我不想自己写。我可以从cabal安装一些依赖，但我希望它是跨平台的（至少是Linux和Windows）。

I would not like to write my own. I can install some dependency from cabal but I want it to be cross platform (at least Linux and Windows).

推荐答案

这是使用目录树列出目录树中所有Haskell文件的一种方法隐藏目录（名称以'。'开头）：

Here is one way to list all Haskell files in a directory tree, using directory-tree that is not in a hidden directory (whose name starts with '.'):

import Data.Traversable (traverse)
import System.Directory.Tree (
    AnchoredDirTree(..), DirTree(..),
    filterDir, readDirectoryWith
    )
import System.FilePath (takeExtension)

listFilesDirFiltered = do
    _:/tree <- readDirectoryWith return "C:\\devmy\\code"
    traverse print $ filterDir myPred tree
    return ()
  where myPred (Dir ('.':_) _) = False
        myPred (File n _) = takeExtension n == ".hs"
        myPred _ = True

main = listFilesDirFiltered

适用于Windows和Linux。

Works on both Windows and Linux.

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