Re: [Nix-dev] Haskell workflow - ghc not in PATH - recommended way / documentation?

[Marc Weber]

> nix-shell -A env
my fault - sry.

In the past I used sourceAndTags to get sources tagged (using hasktags)
so that I was able to jump to source using Vim's :tjump command (and
search names) fast.

Is this workflow "outdated" eg because hoogle can do it or should I try
integrating it into current haskell-packages?

hastags fails at "template haskell generated stuff", adding it is
trivial because its just applying

  addHasktagsTaggingInfo = deriv : deriv // {

to an existing derivation. It served me quite well that time.

Marc Weber
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Re: [Nix-dev] Haskell workflow - ghc not in PATH - recommended way / documentation?

[Brian McKenna]

I think you might want to use:

nix-shell -A env

The `env` attribute creates a derivation that brings in GHC. You can
generate a shell.nix via `cabal2nix --shell` which detects if you're
in a shell and automatically uses the attribute.

On 23 June 2016 at 19:24, Marc Weber  wrote:
> It's way too much work to keep maintaining my nixpkgs-haskell-overlay.
>
> Trying the workflow specified in the manual:
>
> 1) ./default.nix:
>
>   { nixpkgs ? import  {}, compiler ? "ghc7102" }:
>   nixpkgs.pkgs.haskell.packages.${compiler}.callPackage ./foo.nix { }
>
>
> 2) cabal2nix . >| foo.nix
>
> 3) nix-shell --command zsh
>
> however doesn't put ghc in PATH.
>
> BTW: Cabal2nix on cabal2nix seems to fail:
>
> configureFlags: --verbose 
> --prefix=/nix/store/qk9jk6abnqzg8dybzgiabm4p3wjmflr0-distribution-nixpkgs-1 
> --libdir=$prefix/lib/$compiler --libsubdir=$pkgid --with-gcc=gcc 
> --package-db=/tmp/nix-build-distribution-nixpkgs-1.drv-0/package.conf.d 
> --ghc-option=-optl=-Wl,-rpath=/nix/store/qk9jk6abnqzg8dybzgiabm4p3wjmflr0-distribution-nixpkgs-1/lib/ghc-7.10.2/distribution-nixpkgs-1
>  --enable-split-objs --disable-library-profiling 
> --disable-executable-profiling --enable-shared --enable-library-vanilla 
> --enable-executable-dynamic --enable-tests
> Configuring distribution-nixpkgs-1...
> Setup: At least the following dependencies are missing:
> Cabal >1.24
> builder for 
> ‘/nix/store/9ml89qkri8fkn1bldyh446a2g6rkscjc-distribution-nixpkgs-1.drv’ 
> failed with exit code 1
> error: build of 
> ‘/nix/store/9ml89qkri8fkn1bldyh446a2g6rkscjc-distribution-nixpkgs-1.drv’ 
> failed
>
>
> I'm pretty sure that I missed something obvious ..
>
> Marc Weber
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[Nix-dev] Haskell workflow - ghc not in PATH - recommended way / documentation?

[Marc Weber]

It's way too much work to keep maintaining my nixpkgs-haskell-overlay.

Trying the workflow specified in the manual:

1) ./default.nix:

  { nixpkgs ? import  {}, compiler ? "ghc7102" }:
  nixpkgs.pkgs.haskell.packages.${compiler}.callPackage ./foo.nix { }


2) cabal2nix . >| foo.nix

3) nix-shell --command zsh

however doesn't put ghc in PATH.

BTW: Cabal2nix on cabal2nix seems to fail:

configureFlags: --verbose 
--prefix=/nix/store/qk9jk6abnqzg8dybzgiabm4p3wjmflr0-distribution-nixpkgs-1 
--libdir=$prefix/lib/$compiler --libsubdir=$pkgid --with-gcc=gcc 
--package-db=/tmp/nix-build-distribution-nixpkgs-1.drv-0/package.conf.d 
--ghc-option=-optl=-Wl,-rpath=/nix/store/qk9jk6abnqzg8dybzgiabm4p3wjmflr0-distribution-nixpkgs-1/lib/ghc-7.10.2/distribution-nixpkgs-1
 --enable-split-objs --disable-library-profiling --disable-executable-profiling 
--enable-shared --enable-library-vanilla --enable-executable-dynamic 
--enable-tests
Configuring distribution-nixpkgs-1...
Setup: At least the following dependencies are missing:
Cabal >1.24
builder for 
‘/nix/store/9ml89qkri8fkn1bldyh446a2g6rkscjc-distribution-nixpkgs-1.drv’ failed 
with exit code 1
error: build of 
‘/nix/store/9ml89qkri8fkn1bldyh446a2g6rkscjc-distribution-nixpkgs-1.drv’ failed


I'm pretty sure that I missed something obvious ..

Marc Weber
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