haskell – Pandoc’无法找到模块……’用于已安装的模块

2019年8月4日 258次阅读

我目前正在尝试使用pandoc(作为
Haskell模块,而不是程序)将MediaWiki文本转换为其他格式.

我们假设这个程序：

 import Text.Pandoc.Readers.MediaWiki
 main = do print "foo"

使用runghc运行它时,我收到以下错误消息：

pandock.hs:1:8:
    Could not find module `Text.Pandoc.Readers.MediaWiki'
    Use -v to see a list of the files searched for.

我的第一个假设是pandoc未安装或未正确安装.因此我用–force-reinstalls重新安装它

$cabal install pandoc --reinstall
[...]
In order, the following will be installed:
pandoc-1.12.3.1 (reinstall) changes: old-time-1.1.0.1 added
[...]
[32 of 55] Compiling Text.Pandoc.Readers.MediaWiki ( src/Text/Pandoc/Readers/MediaWiki.hs, dist/build/Text/Pandoc/Readers/MediaWiki.o )
[...]
Installing library in
/home/uli/.cabal/lib/x86_64-linux-ghc-7.6.3/pandoc-1.12.3.1
Installing executable(s) in /home/uli/.cabal/bin
Registering pandoc-1.12.3.1...
Installed pandoc-1.12.3.1

runghc -v pandock.hs的输出很长,我假设相关部分是：

*** Chasing dependencies:
Chasing modules from: *pandock.hs

pandock.hs:1:8:
    Could not find module `Text.Pandoc.Readers.MediaWiki'
    Locations searched:
      Text/Pandoc/Readers/MediaWiki.hs
      Text/Pandoc/Readers/MediaWiki.lhs
Failed, modules loaded: none.

但是,〜/ .cabal / lib / x86_64-linux-ghc-7.6.3 / pandoc-1.12.3.1 / Text / Pandoc / Readers / Mediawiki / MediaWiki.hi和〜/ .cabal / bin / pandoc都存在.如何让GHC正确识别cabal安装的包装？

任何帮助将不胜感激！

最佳答案 尝试在其他计算机上重现此问题时,5台计算机中只有2台出现此问题.在他们两个上我以大致相同的方式和顺序安装了cabal包.

回想起来,我认为这个问题的出现是因为一些破损的软件包造成了严重破坏：

$ghc-pkg check
There are problems in package feed-0.3.9.2:
  dependency "xml-1.3.13-dd52b1688e97a3c6cd0aa48dba7b153e" doesn't exist
There are problems in package hxt-9.3.1.3:
  dependency "network-2.4.2.2-ea77cdf1bc747bc58308fdeb52745c4d" doesn't exist
There are problems in package hspec-1.8.1.1:
  dependency "QuickCheck-2.6-409fcc32c191cd6e04afdebb15869820" doesn't exist
There are problems in package quickcheck-io-0.1.0:
  dependency "QuickCheck-2.6-409fcc32c191cd6e04afdebb15869820" doesn't exist
There are problems in package regex-compat-0.95.1:
  dependency "regex-base-0.93.2-2023953b859e6f91efe89733d2ef5421" doesn't exist
There are problems in package regex-posix-0.95.2:
  dependency "regex-base-0.93.2-2023953b859e6f91efe89733d2ef5421" doesn't exist
There are problems in package hxt-9.3.1.2:
  dependency "network-2.4.2.2-ea77cdf1bc747bc58308fdeb52745c4d" doesn't exist

The following packages are broken, either because they have a problem
listed above, or because they depend on a broken package.
feed-0.3.9.2
hxt-9.3.1.3
hspec-1.8.1.1
quickcheck-io-0.1.0
regex-compat-0.95.1
regex-posix-0.95.2
hxt-9.3.1.2
MissingH-1.2.0.2
yesod-test-1.2.1

请注意,在那里列出了pandoc和yaml(我在询问问题之后安装它并且具有与pandoc完全相同的问题).

对于也有类似问题的用户,请确保：

>软件包已安装,您不在任何未安装软件包的沙箱内.
>在执行测试脚本的目录中,确保没有Text / Pandoc文件夹(或等效文件夹,具体取决于导致问题的包
>使用runghc -v运行测试脚本以检查它是否搜索正确的目录
> ghc-pkg list列出您的软件包已安装,并且没有软件包损坏(使用ghc-pkg检查来检查)

我通过重命名〜/ .cabal和〜/ .ghc解决了我的问题.请注意,我这样做是缺乏正确的解决方案,我认为你应该只做这个作为最后的手段.

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