haskell - 自动列出项目的依赖项

Question

给定一个 Haskell 项目，有没有办法自动计算整个依赖项列表？它依赖的所有库以及已包含但不需要的库。

Answer 1

正如我在评论中所说，cabal-install 已经通过模块查找（如 GHCi）猜测包来做到这一点（我正在使用 cabal-install 0.14.0）。它没有任何真正的智能 wrt 版本，因此它只是将版本设置为与您安装的主要版本相匹配。

下面你可以看到我制作了一个虚拟包，它导入Data.Vector和 cabal-install 推断我正在使用向量 0.9.*。

[tommd@mavlo blah]$ pwd
/tmp/blah
[tommd@mavlo blah]$ cat Data/Blah.hs 
module Data.Blah where

import Data.Vector
[tommd@mavlo blah]$ cabal init
Package name? [default: blah] 
...SNIP...
What does the package build:
   1) Library
   2) Executable
Your choice? 1
Include documentation on what each field means (y/n)? [default: n] 

Guessing dependencies...           <--- SEE, SEE! YAY!

Generating LICENSE...
Warning: unknown license type, you must put a copy in LICENSE yourself.
Generating Setup.hs...
Generating blah.cabal...

You may want to edit the .cabal file and add a Description field.
[tommd@mavlo blah]$ cat blah.cabal 
-- Initial blah.cabal generated by cabal init.  For further documentation, 
-- see http://haskell.org/cabal/users-guide/

name:                blah
version:             0.1.0.0
synopsis:            Sisponys
-- description:         
-- license:             
license-file:        LICENSE
author:              Me
maintainer:          No@No.No
-- copyright:           
-- category:            
build-type:          Simple
cabal-version:       >=1.8

library
  exposed-modules:     Data.Blah
  -- other-modules:       
  build-depends:       base ==4.5.*, vector ==0.9.*    <-- SEE?? SEE! YIPPEE!!