Haskell 仅 `cabal` "partially" 安装包

Question

在 Ubuntu 18:04.

上使用 cabal 安装名为 Tidal 的 Haskell 包时遇到问题

https://tidalcycles.org/index.php/Userbase

我不是 Haskell 专家并且之前已经对这些东西感到厌倦了几次，所以我尝试使用这个 -

尽可能全新地安装

https://www.haskell.org/ghcup/

我尽可能多地清理了 Haskell- 相关的东西 -

justin@justin-XPS-13-9360:~$ rm -rf ~/.cabal/
justin@justin-XPS-13-9360:~$ rm -rf ~/.ghc
justin@justin-XPS-13-9360:~$ rm -rf ~/.ghcup

还有任何 Ubuntu 遗产 Haskell -

justin@justin-XPS-13-9360:~$ sudo apt-get remove ghc

所以-

justin@justin-XPS-13-9360:~$ ghci
bash: /home/justin/.ghcup/bin/ghci: No such file or directory

好的，我们走 -

curl https://get-ghcup.haskell.org -sSf | sh

这给了我 -

{...}
Done installing, run "ghci-8.6.5" or set up your current GHC via: ghcup set 8.6.5
Setting GHC to 8.6.5
Done
Setting GHC to 8.6.5
Done
{...}
Successfully installed cabal-install into
  /home/justin/.ghcup/bin
Detected "/home/justin/.bashrc" on your system...
If you want ghcup to automatically fix your "/home/justin/.bashrc" to include the required PATH variable
answer with YES, otherwise with NO and press ENTER.

YES
OK! /home/justin/.bashrc has been modified. Restart your terminal for the changes to take effect,
or type "source /home/justin/.ghcup/env" to apply them in your current terminal session.

让我们设置 PATH 并测试 -

justin@justin-XPS-13-9360:~$ source /home/justin/.ghcup/env
justin@justin-XPS-13-9360:~$ ghci
GHCi, version 8.6.5: http://www.haskell.org/ghc/  :? for help
Prelude>

到目前为止一切顺利。现在关注这个 -

https://tidalcycles.org/index.php/Troubleshooting_a_Tidal_install

我尝试以下 -

justin@justin-XPS-13-9360:~$ cabal update
Downloading the latest package list from hackage.haskell.org
To revert to previous state run:
    cabal v2-update 'hackage.haskell.org,2019-11-20T01:17:49Z'

然后-

justin@justin-XPS-13-9360:~$ cabal new-install tidal --lib
{...}
Starting     tidal-1.4.4 (lib)
Building     tidal-1.4.4 (lib)
Installing   tidal-1.4.4 (lib)
Completed    tidal-1.4.4 (lib)

看起来还不错，但这就是问题开始的地方 -

justin@justin-XPS-13-9360:~$ cabal info tidal
* tidal            (library)
    Synopsis:      Pattern language for improvised music
    Versions available: 0.8.2, 0.9.9, 0.9.10, 1.2.1, 1.3.0, 1.4.1, 1.4.2, 1.4.3,
                        1.4.4 (and 99 others)
    Versions installed: [ Not installed ]

嗯 - Not installed ??并且-

justin@justin-XPS-13-9360:~$ ghc-pkg latest tidal
ghc-pkg: cannot find package tidal

呵呵。但是，如果我查看 ~/.cabal，我可以看到 一些东西 已经安装 -

justin@justin-XPS-13-9360:~$ ls -l /home/justin/.cabal/store/ghc-8.6.5/
total 100
{...}
drwxr-xr-x 4 justin justin 4096 Nov 20 06:00 tidal-1.4.4-898a4af91fab9d9d757e1a84104bbd7ca568a77d48b4679a3f4addb65912423a
{...}

我什至可以检查 ~/.cabal/store 中安装的库是否正常工作 -

justin@justin-XPS-13-9360:~$ ghci
GHCi, version 8.6.5: http://www.haskell.org/ghc/  :? for help
Loaded package environment from /home/justin/.ghc/x86_64-linux-8.6.5/environments/default
Prelude> :script /home/justin/.cabal/store/ghc-8.6.5/tidal-1.4.4-898a4af91fab9d9d757e1a84104bbd7ca568a77d48b4679a3f4addb65912423a/share/BootTidal.hs
Listening for controls on 127.0.0.1:6010
tidal> :t d1
d1 :: Pattern ControlMap -> IO ()
tidal>

但是我想使用 Tidal 及其 emacs 扩展 -

https://github.com/tidalcycles/Tidal/blob/master/tidal.el

按如下方式查找软件包，需要 cabal info tidal 到 return 正确安装的版本 -

 '(("path" . "ghc-pkg describe $(ghc-pkg latest tidal) | grep data-dir | cut -f2 -d' '")

本质上，emacs 扩展希望包驻留在此处（这将使 cabal info tidal 工作）

/home/justin/.cabal/share/x86_64-linux-ghc-8.6.5/tidal-1.4.4/BootTidal.hs

但是cabal似乎只"partially"在这里安装包-

/home/justin/.cabal/store/ghc-8.6.5/tidal-1.4.4-898a4af91fab9d9d757e1a84104bbd7ca568a77d48b4679a3f4addb65912423a/share/BootTidal.hs

现在我可能可以破解 emacs 扩展以指向 ~/.cabal/store 而不是 ~/.cabal/share，但我希望它能正常工作并且 cabal info tidal 指向 return正确的版本。

谁能告诉我为什么 cabal 没有将文件推送到 ~/.cabal/share？

TIA。

Answer 1

按照上面概述的过程关闭它实际上是 "working"，只是 cabal 社区似乎正在从 "old-style" 安装过程转移到 "new-style"，并且新手并不总是清楚其中的区别。此外，某些软件包的某些部分（特别是 Tidal 软件包中的 tidal.el）尚未更新以反映 cabal 安装过程中的更改。谢谢！

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