交叉引用问题

[annProg]

考虑使用 pandoc-crossref，但是pandoc-crossref依赖 metadata 变量 header-includes，pandoc命令行指定-H/--include-in-header时会覆盖metadata变量。

• https://groups.google.com/d/msg/pandoc-discuss/N6WhlmSPXbY/X595i29QAgAJ
• https://lierdakil.github.io/pandoc-crossref/#latex-output-and---include-in-header

[annProg]

可能的解决方案:

参考 https://pandoc.org/lua-filters.html , Default metadata file，将 -H参数用lua-filter加入metadata变量header-includes中

-- read metadata file into string
local metafile = io.open('metadata-file.yaml', 'r')
local content = metafile:read("*a")
metafile:close()
-- get metadata
local default_meta = pandoc.read(content, "markdown").meta

return {
  {
    Meta = function(meta)
      -- use default metadata field if it hasn't been defined yet.
      for k, v in pairs(default_meta) do
        if meta[k] == nil then
          meta[k] = v
        end
      end
      return meta
    end,
  }