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fixed a bug in 9.rst #157

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fixed a bug in 9.rst #157

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13 changes: 7 additions & 6 deletions chp/9.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -24,12 +24,13 @@ find命令
getRecursiveContents topdir = do
names <- getDirectoryContents topdir
let properNames = filter (`notElem` [".", ".."]) names
paths <- forM properNames $ \name -> do
let path = topdir </> name
isDirectory <- doesDirectoryExist path
if isDirectory
then getRecursiveContents path
else return [path]
paths <- forM properNames
$ \name -> do
let path = topdir </> name
isDirectory <- doesDirectoryExist path
if isDirectory
then getRecursiveContents path
else return [path]
return (concat paths)

单个表达式可以识别像“符合这个全局模式的名称”，“目录项是一个文件”，“当前最后一个被修改的文件”以及其他诸如此类的表达式，通过and或or算子就可以把他们装配起来构成更加复杂的表达式
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