CODEWITHSUNDEEP
haskell
Arii
Arii

Reputation: 411

doesFileExist not finding files that exist

So I have a directory, /test, and in it are the following files: 

test.txt  
BasicLoop.vm  
FibonacciSeries.vm  
StackTest.vm  
test.vm

I'm trying to read all the .vm files into one massive string, and in order to do so I thought to use filterM doesFileExist dir where dir is the result of getDirectoryContents, to remove directories and symlinks and whatever, but when I test it, the result of that filter is just BasicLoop.vm and test.vm. None of them are empty, and they show up when I peek at the contents of dir, so they clearly do exist. Why does the function say they don't?

Upvotes: 2

Views: 450

Answers (1)

user8174234
user8174234

Reputation:

Why does the function say they don't?

Because getDirectoryContents returns the file and directory names, not the full filepath. To see that, try something like:

λ:> getDirectoryContents "test"
["data","..","test.dats","."]

Upvotes: 4

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