Work on Windows

[ndmitchell]

Currently pier depends on unix. It seems that the reason is to use symlinks? The latest directory package has https://hackage.haskell.org/package/directory-1.3.2.2/docs/System-Directory.html#v:createDirectoryLink, which might give you a portable way of doing that.

[judah]

Thanks for the suggestion! I've pushed 6c8c273 which removes the unix dependency on Windows. (It still keeps it for non-Windows since a new enough version of directory isn't available in a Stackage LTS yet.)

I don't currently have access to a Windows machine for testing, though. Could you confirm whether or not the latest master works for you?

[ndmitchell]

Any reason for not just going for nightly? People think lts has magically properties - it doesn't - it's just a buggy version of nightly. http://neilmitchell.blogspot.co.uk/2015/12/whats-point-of-stackage-lts.html

Will test it out later. Generally I suggest using Appveyor which will keep it working.

[ndmitchell]

I'm getting errors all over the place, e.g.:

src\Pier\Build\Executable.hs:9:2: error:
    lexical error at character 'i'
  |
9 | #if !MIN_VERSION_base(4,11,0)
  |  ^

Seems like you need a lot of {-# LANGUAGE CPP #-} extensions?

[judah]

Strange, it passes in CI and has CPP set globally now: https://github.com/judah/pier/blob/master/package.yaml#L21

Maybe pier.cabal wasn't regenerated by stack? Can you try deleting that file and re-running stack build?

[ndmitchell]

Your guess was correct.

C:\Neil\pier>pier build pier
Downloading lts-10.3.yaml
Downloading stack-setup-2.yaml
Error when running Shake build system:
* Library pier
* GHC StackageGhc, version 8.2.2, built-in packages containers, ghc-prim, ghc-boot, ghci, template-haskell, terminfo, ghc-boot-th, binary, deepseq, base, filepath, hpc, ghc, rts, unix, hoopl, array, process, pretty, transformers, bytestring, directory, integer-gmp, time
* Download "stack-setup-2.yaml" from "https://raw.githubusercontent.com/fpco/stackage-content/master/stack" into "stackage/setup"
Unable to download "https://raw.githubusercontent.com/fpco/stackage-content/master/stack\\stack-setup-2.yaml"
Status: 404 Not Found
CallStack (from HasCallStack):
  error, called at src\\Pier\\Core\\Download.hs:73:31 in pier-0.1.0.0-EjHH5CVmHFJ2HvlUpWrxEz:Pier.Core.DownloadC:\Neil\pier>pier build pier
Downloading lts-10.3.yaml
Downloading stack-setup-2.yaml
Error when running Shake build system:
* Library pier
* GHC StackageGhc, version 8.2.2, built-in packages containers, ghc-prim, ghc-boot, ghci, template-haskell, terminfo, ghc-boot-th, binary, deepseq, base, filepath, hpc, ghc, rts, unix, hoopl, array, process, pretty, transformers, bytestring, directory, integer-gmp, time
* Download "stack-setup-2.yaml" from "https://raw.githubusercontent.com/fpco/stackage-content/master/stack" into "stackage/setup"
Unable to download "https://raw.githubusercontent.com/fpco/stackage-content/master/stack\\stack-setup-2.yaml"
Status: 404 Not Found
CallStack (from HasCallStack):
  error, called at src\\Pier\\Core\\Download.hs:73:31 in pier-0.1.0.0-EjHH5CVmHFJ2HvlUpWrxEz:Pier.Core.Download

Looks like you're using </> for URL construction? Should use ++ "/" ++ explicitly.

[chreekat]

@ndmitchell fyi, new patch came in Sep 2018 that fixed your last comment (from May 2018)