haskell - 在Nix的Haskell开发环境中使用hoogle

我正试图在Haskell开发环境中使用hoogle
像O'Charles' wiki描述的那样:

我已经如下修改了shell.nix以便使用hoogleLocal，但它似乎并没有为我安装hoogle二进制文件。

let
  pkgs = import <nixpkgs> {};

  # I'm attempting to use hoogle here, but it is not working.
  haskellPackages =
    let callPackage = pkgs.lib.callPackageWith haskellPackages;
    in pkgs.recurseIntoAttrs (pkgs.haskellPackages.override {
      extension = self: super: {
        thiscurrentpackage = self.callPackage ./. {};
        hoogleLocal = pkgs.haskellPackages.hoogleLocal.override {
          packages = self.thiscurrentpackage;
        };
      };
    });
in pkgs.myEnvFun {
  name = haskellPackages.thiscurrentpackage.name;
  buildInputs = [
    (haskellPackages.ghcWithPackages (hs: ([
      hs.cabalInstall
      hs.ghcMod
      hs.yesodBin
      # This doesn't appear to install the hoogle binary?
      hs.hoogleLocal
    ] ++ hs.thiscurrentpackage.propagatedNativeBuildInputs)))
  ];
}

在生成的shell中，hoogle二进制文件不可用。

如果我将hs.hoogle包括在buildInputs中，则会安装hoogle二进制文件，但找不到数据库。下面是我尝试使用它时发生的情况。

$ nix-shell
......
$ hoogle Monad
Could not find some databases: default
Searching in:
  .
    /nix/store/91y9q2y5a2ws8xgcsx1gkhfagc0f2qz6-haskell-hoogle-ghc7.8.3-4.2.36-shared/share/x86_64-linux-ghc-7.8.3/hoogle-4.2.36/databases

    There are no available databases, generate them with: hoogle data
$ hoogle data
    hoogle: /nix/store/91y9q2y5a2ws8xgcsx1gkhfagc0f2qz6-haskell-hoogle-ghc7.8.3-4.2.36-shared/share/x86_64-linux-ghc-7.8.3/hoogle-4.2.36/databases:
changeWorkingDirectory: does not exist (No such file or directory)
$

对于O'Charles所述的设置，我如何使其正常工作？

编辑:原始的shell.nix与this answer相同。

最佳答案

这是我的Nix Haskell开发环境的样子

在~/.nixpkgs/config.nix中:

环境助手功能

首先，定义一个用于构建Haskell环境的haskellEnvFun函数:

packageOverrides = super: rec {

haskellEnvFun = { withHoogle ? false, compiler ? null, name }:
  let hp = if compiler != null
             then super.haskell.packages.${compiler}
             else haskellPackages;

      ghcWith = if withHoogle
                  then hp.ghcWithHoogle
                  else hp.ghcWithPackages;

  in super.buildEnv {
    name = name;
    paths = [(ghcWith myHaskellPackages)];
  };

定义一些环境

调用此函数来定义两种环境:一种用于在更改时运行Hoogle构建器，另一种则没有:

haskellEnvHoogle = haskellEnvFun {
  name = "haskellEnvHoogle";
  withHoogle = true;
};

haskellEnv = haskellEnvFun {
  name = "haskellEnv";
  withHoogle = false;
};

配套

定义要在本地Haskell开发环境中使用的所有软件包:

myHaskellPackages = hp: with hp; [
  Boolean
  HTTP
  HUnit
  MissingH
  QuickCheck
  SafeSemaphore
  Spock
  aeson
  async
  attoparsec
  bifunctors
  blaze-builder
  blaze-builder-conduit
  blaze-builder-enumerator
  blaze-html
  blaze-markup
  blaze-textual
  cased
  cassava
  cereal
  comonad
  comonad-transformers
  directory_1_2_4_0
  dlist
  dlist-instances
  doctest
  exceptions
  fingertree
  foldl
  free
  hamlet
  hashable
  hspec
  hspec-expectations
  html
  http-client
  http-date
  http-types
  io-memoize
  keys
  language-c
  language-javascript
  language-bash
  lens
  lens-action
  lens-aeson
  lens-datetime
  lens-family
  lens-family-core
  lifted-async
  lifted-base
  linear
  list-extras
  list-t
  logict
  mime-mail
  mime-types
  mmorph
  monad-control
  monad-coroutine
  monad-loops
  monad-par
  monad-par-extras
  monad-stm
  monadloc
  mongoDB
  monoid-extras
  network
  newtype
  numbers
  optparse-applicative
  parsec
  parsers
  pcg-random
  persistent
  persistent-mongoDB
  persistent-template
  pipes
  pipes-async
  pipes-attoparsec
  pipes-binary
  pipes-bytestring
  pipes-concurrency
  pipes-csv
  pipes-extras
  pipes-group
  pipes-http
  pipes-mongodb
  pipes-network
  pipes-parse
  pipes-safe
  pipes-shell
  pipes-text
  posix-paths
  postgresql-simple
  pretty-show
  profunctors
  random
  reducers
  reflection
  regex-applicative
  regex-base
  regex-compat
  regex-posix
  regular
  relational-record
  resourcet
  retry
  rex
  safe
  sbv
  scotty
  semigroupoids
  semigroups
  shake
  shakespeare
  shelly
  simple-reflect
  speculation
  split
  spoon
  stm
  stm-chans
  stm-stats
  streaming
  streaming-bytestring
  streaming-wai
  strict
  stringsearch
  strptime
  syb
  system-fileio
  system-filepath
  tagged
  taggy
  taggy-lens
  tar
  tardis
  tasty
  tasty-hspec
  tasty-hunit
  tasty-quickcheck
  tasty-smallcheck
  temporary
  test-framework
  test-framework-hunit
  text
  text-format
  time
  tinytemplate
  transformers
  transformers-base
  turtle
  uniplate
  unix-compat
  unordered-containers
  uuid
  vector
  void
  wai
  wai-conduit
  warp
  wreq
  xhtml
  yaml
  zippers
  zlib
];

壳牌 helper

在~/.profile中，定义了几个bash函数以方便地加载这些环境:

env-type () {
  envtype="$1"
  shift
  nix-shell -Q -p $envtype "$@"
}

haskell-env () {
  env-type "haskellEnv" "$@"
}

haskell-env-hoogle () {
  env-type "haskellEnvHoogle" "$@"
}

Hoogle

Call haskell-env-hoogle in your shell. This will build all of your packages + docs and load you into an environment with hoogle in scope. At this point I usually type:

hoogle server --local -p 8080 &> /tmp/hoogle.log & disown

在后台启动hoogle服务器。最终，我想为此提供一个systemd服务，以便我可以通过nixos-rebuild来重新生成文档并自动启动服务器。

埃马克斯

对于emacs，我已将haskell-hoogle-url设置为http://localhost:8080/?hoogle=%s，以便可以在光标下获取关键字的本地文档。我使用spacemacs，因此只需为此功能输入, h h。

您可以在此处查看我的完整nixpkgs配置:https://github.com/jb55/nix-files/blob/659798f2ca81fb7ad0cb5a29de576024ee16eef8/nixpkgs/config.nix#L20

希望能有所帮助。

关于haskell - 在Nix的Haskell开发环境中使用hoogle，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/27728838/