Re: [Haskell-cafe] Ported a Python script for use with Go to Haskell

The script itself looks pretty good to me, but you might want to take a look at Shelly https://hackage.haskell.org/package/shelly [0] for Haskell scripting in the future. It's a really nice library / DSL for "bash"-like scripting directly in Haskell. If you try out Shelly, I suggest trying it with ClassyPrelude and -XOverloadedStrings, which makes dealing with all the Text and FilePath types bearable. (Heh, though it's annoying, having FilePath as a separate type once prevented me from writing code that deleted my home directory upon being run... fun story.) [0] https://hackage.haskell.org/package/shelly On Sat, Apr 5, 2014 at 4:33 AM, Kim-Ee Yeoh wrote:

On Sat, Apr 5, 2014 at 5:21 PM, Robert Vollmert wrote:

...

- clobbering the environment by prepending to an association list makes me wonder if that's really what happens when the variable is already defined

Yes, that does raise flags.

The haskell here:

installEnv <- getEnvironment >>= return . (:) ("GOBIN", gOBIN)

which I'd probably write as

installEnv <- (("GOBIN", gOBIN) :) <$> getEnvironment

doesn't match the python here:

GOBIN = tempfile.gettempdir() os.environ['GOBIN'] = GOBIN

in the sense that the case for a predefined GOBIN in the environment will lead to different results. At least I'll be surprised if otherwise.

To Matt: have you tested your haskell version? You might want to take a look at System.Posix.Env.putenv.

-- Kim-Ee

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