[英]How can I manage multiple configurations of a single Haskell program?
What is an alternative to autotools in Haskell world? 在Haskell世界中,什么是autotools的替代品? I want to be able to choose between different configurations of the same source code.
我希望能够在相同源代码的不同配置之间进行选择。
For example, there are at least two implementations of MD5 in Haskell: Data.Digest.OpenSSL.MD5
and Data.Digest.Pure.MD5
. 例如,Haskell中至少有两个MD5实现:
Data.Digest.OpenSSL.MD5
和Data.Digest.Pure.MD5
。 I'd like to write code in such a way that it can figure out which library is already installed, and didn't require to install the other. 我想以这样的方式编写代码,它可以找出已安装的库,并且不需要安装另一个库。
In CI can use Autotools/Scons/CMake + cpp
. 在CI中可以使用Autotools / Scons / CMake +
cpp
。 In Python I can catch ImportError
. 在Python中我可以捕获
ImportError
。 Which tools should I use in Haskell? 我应该在Haskell中使用哪些工具?
In Haskell you use Cabal configurations. 在Haskell中,您使用Cabal配置。 At your project top-level directory, you put a file with the extension
.cabal
, eg, <yourprojectname>.cabal
. 在项目顶级目录中,放置扩展名为
.cabal
的文件,例如<yourprojectname>.cabal
。 The contents are roughly: 内容大致如下:
Name: myfancypackage
Version: 0.0
Description: myfancypackage
License: BSD3
License-file: LICENSE
Author: John Doe
Maintainer: john@example.com
Build-Type: Simple
Cabal-Version: >=1.4
Flag pure-haskell-md5
Description: Choose the purely Haskell MD5 implementation
Default: False
Executable haq
Main-is: Haq.hs
Build-Depends: base-4.*
if flag(pure-haskell-md5)
Build-Depends: pureMD5-0.2.*
else
Build-Depends: hopenssl-1.1.*
The Cabal documentation has more details, in particular the section on Configurations . Cabal文档有更多详细信息,特别是有关配置的部分。
As nominolo says, Cabal is the tool to use. 正如nominolo所说,Cabal是使用的工具。 In particular, the 'configurations" syntax.
特别是'配置'语法。
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