问：

我有一个带有外部依赖项的脚本，我可以用它执行。我想在/中加载此脚本，并尽可能减少副作用。cabal runghcicabal repl

这是我的脚本：

#!/usr/bin/env cabal
{- cabal:
build-depends: base
            , split
-}

import Data.List.Split (splitOn)

main :: IO ()
main = do
  let orders = splitOn "x" "axbxc"
  putStrLn $ head orders

我可以执行它 编译一个具有外部依赖关系的 haskell 脚本，而无需 cabal

$ cabal run script.hs
Warning: Unknown/unsupported 'ghc' version detected (Cabal 3.6.2.0 supports
'ghc' version < 9.4): /home/t/.ghcup/bin/ghc is version 9.4.7
Resolving dependencies...
Build profile: -w ghc-9.4.7 -O1
In order, the following will be built (use -v for more details):
 - fake-package-0 (exe:script) (first run)
Configuring executable 'script' for fake-package-0..
Preprocessing executable 'script' for fake-package-0..
Building executable 'script' for fake-package-0..
[1 of 1] Compiling Main             ( Main.hs, /tmp/cabal-repl.-4510/dist-newstyle/build/x86_64-linux/ghc-9.4.7/fake-package-0/x/script/build/script/script-tmp/Main.o )
[2 of 2] Linking /tmp/cabal-repl.-4510/dist-newstyle/build/x86_64-linux/ghc-9.4.7/fake-package-0/x/script/build/script/script
a

但是如果我在 ghci 中导入它，则外部依赖项存在问题：

$ cabal repl
Warning: Unknown/unsupported 'ghc' version detected (Cabal 3.6.2.0 supports
'ghc' version < 9.4): /home/t/.ghcup/bin/ghc is version 9.4.7
Resolving dependencies...
Build profile: -w ghc-9.4.7 -O1
In order, the following will be built (use -v for more details):
 - fake-package-0 (lib) (first run)
Configuring library for fake-package-0..
Preprocessing library for fake-package-0..
Warning: No exposed modules
GHCi, version 9.4.7: https://www.haskell.org/ghc/  :? for help
Loaded GHCi configuration from /tmp/cabal-repl.-4707/setcwd.ghci
ghci> :load script.hs
[1 of 2] Compiling Main             ( script.hs, interpreted )

script.hs:7:1: error:
    Could not load module ‘Data.List.Split’
    It is a member of the hidden package ‘split-0.2.4’.
    Perhaps you need to add ‘split’ to the build-depends in your .cabal file.
    Use -v (or `:set -v` in ghci) to see a list of the files searched for.
  |
7 | import Data.List.Split (splitOn)
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Failed, no modules loaded.

既然我已经将“split”添加到脚本的构建依赖项中，那么我有什么方法可以指向该部分吗？ 我想让事情尽可能简单，不要添加更多文件。 我还想避免在系统级别安装库，以避免版本冲突并保持一切可重现。ghci

我尝试过的事情

如何在阴谋集团repl中自动加载导入？

建议表格，但这似乎对我不起作用：*M

ghci> :load *script.hs
[1 of 2] Compiling Main             ( script.hs, interpreted )

script.hs:7:1: error:
    Could not load module ‘Data.List.Split’
    It is a member of the hidden package ‘split-0.2.4’.
    Perhaps you need to add ‘split’ to the build-depends in your .cabal file.
    Use -v (or `:set -v` in ghci) to see a list of the files searched for.
  |
7 | import Data.List.Split (splitOn)
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Failed, no modules loaded.

根据 Noughtmare 的建议：

cabal repl script.hs对我不起作用：

$ cabal --version
cabal-install version 3.6.2.0
compiled using version 3.6.2.0 of the Cabal library 
bash-5.1$ cabal repl script.hs 
cabal: 'repl' doesn't take any extra arguments when outside a project:
script.hs

但是，这有效：

$ cabal repl --build-depends split
Resolving dependencies...
Build profile: -w ghc-9.4.7 -O1
In order, the following will be built (use -v for more details):
 - fake-package-0 (lib) (first run)
Configuring library for fake-package-0..
Preprocessing library for fake-package-0..
Warning: No exposed modules
GHCi, version 9.4.7: https://www.haskell.org/ghc/  :? for help
Loaded GHCi configuration from /tmp/cabal-repl.-11713/setcwd.ghci
ghci> :load script.hs
[1 of 2] Compiling Main             ( script.hs, interpreted )
Ok, one module loaded.