Some pandoc filters, in haskell or python (whichever I was trying to learn).

Only just started learning Haskell but am trying to favour it for the filters (since pandoc is Haskell), but code is pretty raw.

Usage:

pandoc --filter path/to/filter  intputfile

In python, an element is like this:

{'t': (type, e.g. 'Str'), 'c': (content)}

Some Other Examples

Here are some repositories I found with Haskell pandoc filters to look at:

• https://github.com/aphorisme/AphoFilters/blob/master/src/Text/Pandoc/AphoFilters/MathThm.hs
  • Replaces LaTeX code blocks with attributes "descr", "env" with the corresponding LaTeX environment e.g. \begin{theorem}[description]
  • Pretty neatly done - nice example.
• https://github.com/kisonecat/ximera-pandoc-filter
  • Check out Ximera which appears to take TeX code and convert it into an online interactive activity (with hints and solutions)
  • this filter ... is quite complicated. It might convert a document to ximera-format including drawing/uploading pictures (?). The efunction mergeAdjacent may be of interest to me.
• https://gist.github.com/crzysdrs/11414475
  • splits on end of sentences (?) using regex
• https://github.com/lyokha/styleFromMeta
  • define some HTML/LaTeX code that you want to be used for images, links or some paragraphs and it will do that instead of whatever Pandoc does by default.
• https://github.com/Davorak/PandocFilters/tree/master/filters
  • pandocCmdFilter: replaces a code block with attribute cmdBlock="<command>" with the result of running <command>, and various formatting options.
  • pandocDiagramFilter: replaces code block with class "diagram" with the image caused by running the haskell code in the block (?)
  • pandocDotFilter: replaces a code block with the showDot or showDotCode class with the image produced by running dot (diagram drawer) on the code contained (?)
• https://github.com/jgm/pandoc-highlight/blob/master/Text/Pandoc/Highlighting.hs
  • filter (library, I think) for using pandoc with highlighting-kate
• https://github.com/balachia/pandoc-filters
  • pandoc-internalref: adds labels/ids to images (if specified in a particular way) in order to be able to link back to them.
  • pandoc-dropinenv (filter) with pandoc-postprocess (script): replaces one environment with another environment (?), particularly figure -> sidewaysfigure.
• https://github.com/boisgera/ext-pandoc
  • tex_filter: converts a latex RawBlock to a HTML RawBlock (same with Inline tex to HTML). RawBlock are blocks of embedded LaTeX code (or HTML code), e.g. if I had \eqref{..} in my text it would be RawInline. For use with MathJax (?).
  • patch_html: adds (modifies?) the mathjax script header to a HTML document (they wanted different configuration to what Pandoc puts in)
• https://github.com/kbonne/pandoc-plantuml-filter
  • Replaces (CodeBlocks with the plantumuml class), with PlantUML-generated diagrams.

Here is a repository with Python pandoc filters:

• https://github.com/jgm/pandocfilters

Filters in this repository

Checkbox

File: checkbox.{py, hs}

pandoc --filter ./checkbox.hs checkbox.md

Convert github-style checkbox lists by replacing the [ ] and [x] with unicode U+2610 and U+2611 resp (☐ and ☑).

Todo:

• I don't have the font in Chrome so they don't render right. Replace with format-specific (e.g. HTML checkbox, latex tickmark)