使用 pandoc 作为库时,什么可能导致 "commitAndReleaseBuffer: invalid argument (invalid character)"?

What might cause "commitAndReleaseBuffer: invalid argument (invalid character)" when using pandoc as a library?

我正在使用 pandoc 作为一个库,相关的代码片段是:

module Lib
    ( latexDirToTex, latexToTxt
    ) where

import qualified Data.ByteString as BS
import           Data.List (isSuffixOf)
import qualified Data.Text as T
import qualified Data.Text.IO as TIO
import           ForeignLib (chdir)
import           Path
import           System.Directory (getDirectoryContents )
import           Text.Pandoc
import           Text.Pandoc.UTF8 (toText)

latexToTxt :: Path b File -> IO T.Text
latexToTxt  fPath = do
  fileBS <- BS.readFile $ toFilePath fPath
  result <- runIO $ do
    doc <- readLaTeX def $ toText fileBS
    writePlain def doc
  handleError result

由此可见,我基本上只是调用 readLaTeX 来读取 LaTeX 文档。

然而,当我尝试 运行 这段代码时,我在实践中遇到了很多麻烦,出现了如标题中的错误:

[WARNING] Could not convert TeX math '\begin{array}{ccccccccccc}
       &  & 1 & 2 & 4 & 7 & 11 & 15 & 15 &  &  \
  \hline
      0 & \vline & 1 & 0 & 0 & 0 & 0 & 0 & 0 & \vline & 1 \
      1 & \vline & 1 & 1 & 0 & 0 & 0 & 0 & 0 & \vline & 3 \
      2 & \vline & 1 & 2 & 1 & 0 & 0 & 0 & 0 & \vline & 9 \
      3 & \vline & 1 & 3 & 3 & 1 & 0 & 0 & 0 & \vline & 26 \
      4 & \vline & 1 & 4 & 6 & 4 & 1 & 0 & 0 & \vline & 72 \
      5 & \vline & 1 & 5 & 10 & 10 & 5 & 1 & 0 & \vline & 191 \
      6 & \vline & 0 & 6 & 15 & 20 & 15 & 6 & 1 & \vline & 482 \
      7 & \vline & 0 & 0 & 21 & 35 & 35 & 21 & 7 & \vline & 1134 \
      8 & \vline & 0 & 0 & 0 & 56 & 70 & 56 & 28 & \vline & 2422 \
      9 & \vline & 0 & 0 & 0 & 0 & 126 & 126 & 34 & \vline & 4536 \
      10 & \vline & 0 & 0 & 0 & 0 & 0 & 252 & 210 & \vline & 6930 \
      11 & \vline & 0 & 0 & 0 & 0 & 0 & 0 & 462 & \vline & 6930
    \end{array}', rendering as TeX:
      0 & \vline & 1 & 0 & 0 & 0 & 0 & 0 &
          ^
  unexpected "\"
  expecting "&", "\\", white space or "\end"
arxiv-pandoc-static: <stdout>: commitAndReleaseBuffer: invalid argument (invalid character)

将此与直接使用 pandoc 可执行文件进行对比,没有发生此类错误,并且我收到了非常好的输出。我想将 pandoc 阅读器配置为尽可能灵活,并且不要因错误而放弃(或者更好的是,首先避免错误)。如何通过 pandoc API?

实现此目的

我相信这不是 pandoc 问题,而是 GHC 或 text 包的问题。答案可以在一个完全不相关的 Haskell 项目中找到,hledger docs:

Getting errors like "Illegal byte sequence" or "Invalid or incomplete multibyte or wide character" or "commitAndReleaseBuffer: invalid argument (invalid character)"

Programs compiled with GHC (hledger, haskell build tools, etc.) need to have a UTF-8-aware locale configured in the environment, otherwise they will fail with these kinds of errors when they encounter non-ascii characters.

To fix it, set the LANG environment variable to some locale which supports UTF-8. The locale you choose must be installed on your system.

所以 运行 你 shell 中的 export LANG=C.UTF-8 应该可以解决这个问题。