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C bindings to Pandoc, a markup converter library written in Haskell.

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README.markdown

libpandoc

The purpose of libpandoc is to make the Haskell library Pandoc available for use from C and other non-Haskell environments that support C FFI. Pandoc and libpandoc support text conversion between HTML, Markdown, LaTeX, OpenDocument and other formats.

Obtaining

The latest version is available (BSD license) at GitHub.

Installation

Building

Building follows standard Haskell conventions and requires the Haskell Platform:

# runhaskell Setup.lhs configure [--user]
# runhaskell Setup.lhs build

The configure stage may report missing dependencies. These can be obtained as follows:

# cabal install [dependency]

A successful build creates the shared library file in ./dist/build/libpandoc.dll/libpandoc.dll. Installation and use of the library is platform-dependent.

UNIX Installation

For your convenience, an ./install.sh is provided that installs the shared object and header files under /usr/local. It has been tested on Ubuntu Linux.

To install system-wide in the $LIB folder, copy libpandoc.dll to $LIB/libpandoc.so and run ldconfig $LIB. Also, copy src/pandoc.h to $INCLUDES/.

To use the library from C, do:

#include <pandoc.h>
pandoc(...)

And compile as:

gcc -lpandoc [my-file.c]

Windows Installation

For your convenience, an ./install.bat is provided that installs the shared library under %windir%\System32.

Deploy the shared library in the same folder as your application, or put it under %PATH%. Intallation of header files depends on the C compiler.

Using

C Interface

The C interface is defined in src/pandoc.h. Synopsis:

pandoc_init();
char* error = pandoc(1024       /* buffer size */,
                     "markdown" /* input format */,
                     "html"     /* output format */,
                     NULL       /* XML settings */,
                     reader     /* the reader function */,
                     writer     /* the writer function */,
                     user_data  /* private user data */);
pandoc_exit();

Haskell runtime has to be started and stopped explicitly via the init/exit functions.

The reader function is in the following form:

int reader(char *buf, void *user_data);

Where buf is the buffer to be filled. The size of this buffer is the same as provided as the first argument to the pandoc function. user_data is the same pointer passed as the last argument of the pandoc function. The reader function must fill the buffer with the input to be converted by pandoc.

The writer function is in the following form:

void writer(char *buf, int len, void *user_data);

Where buf is the buffer to be written, len is the number of elements in the buffer and user_data is the last argument of the pandoc function, similar to user_data of the reader. The writer function must write the contents of the buffer as the output of the conversion by pandoc.

Input and Output Formats

Input and output formats depend on Pandoc version the library is built against. They are passed as strings. Possible values include:

  • For reader:

    • docbook
    • html
    • latex
    • markdown
    • mediawiki
    • native
    • rst
    • texmath
    • textile
  • For writer:

    • asciidoc
    • context
    • docbook
    • docx
    • epub
    • fb2
    • html
    • latex
    • man
    • markdown
    • mediawiki
    • native
    • odt
    • opendocument
    • org
    • rst
    • rtf
    • texinfo
    • textile

In addition, an automatically derived xml format is provided for both input and output.

Note: Some read and write types supported by pandoc striked above are not yet supported by libpandoc.

XML Settings

The settings parameter allows to customize the text transformation by passing Pandoc settings as an XML-encoded string. The XML format is derived automatically from Pandoc data type declarations by generic programming.

Below is a printout of the default settings. NOTE: it may be outdated with respect to the current library version. The custom settings passed by the user are merged with the default settings, so only the fields that have non-default values have to be provided.

<record name="LibPandocSettings">
  <field name="writerOptions">
    <record name="WriterOptions">
      <field name="writerStandalone">
        <int>0</int>
      </field>
      <field name="writerTemplate">
        <string></string>
      </field>
      <field name="writerVariables">
        <list />
      </field>
      <field name="writerTabStop">
        <int>4</int>
      </field>
      <field name="writerTableOfContents">
        <int>0</int>
      </field>
      <field name="writerSlideVariant">
        <data name="S5Slides" />
      </field>
      <field name="writerIncremental">
        <int>0</int>
      </field>
      <field name="writerHTMLMathMethod">
        <data name="PlainMath" />
      </field>
      <field name="writerIgnoreNotes">
        <int>0</int>
      </field>
      <field name="writerNumberSections">
        <int>0</int>
      </field>
      <field name="writerNumberOffset">
        <list />
      </field>
      <field name="writerSectionDivs">
        <int>0</int>
      </field>
      <field name="writerExtensions">
        <set />
      </field>
      <field name="writerReferenceLinks">
        <int>0</int>
      </field>
      <field name="writerWrapText">
        <int>1</int>
      </field>
      <field name="writerColumns">
        <int>80</int>       <!-- TODO: unsure -->
      </field>
      <field name="writerLiterateHaskell">
        <int>0</int>
      </field>
      <field name="writerEmailObfuscation">
        <data name="JavascriptObfuscation" />
      </field>
      <field name="writerIdentifierPrefix">
        <string></string>
      </field>
      <field name="writerSourceDirectory">
        <string></string>
      </field>
      <field name="writerUserDataDir">
        <string></string>
      </field>
      <field name="writerCiteMethod">
        <data name="Citeproc" />
      </field>
      <field name="writerBiblioFiles">
        <list />
      </field>
      <field name="writerHtml5">
        <int>0</int>
      </field>
      <field name="writerHtmlQTags">
        <int>0</int>
      </field>
      <field name="writerBeamer">
        <int>0</int>
      </field>
      <field name="writerSlideLevel">
        <int>0</int>
      </field>
      <field name="writerChapters">
        <int>0</int>
      </field>
      <field name="writerListings">
        <int>0</int>
      </field>
      <field name="writerHighlight">
        <int>1</int>
      </field>
      <field name="writerHighlightStyle">
        <data name="pygments" />
      </field>
      <field name="writerSetextHeaders">
        <int>0</int>
      </field>
      <field name="writerTeXLigatures">
        <int>1</int>
      </field>
      <field name="writerEpubVersion">
        <data name="epub2" />
      </field>
      <field name="writerEpubMetadata">
        <string></string>
      </field>
      <field name="writerEpubStylesheet">
        <string></string>
      </field>
      <field name="writerEpubFonts">
        <list />
      </field>
      <field name="writerEpubChapterLevel">
        <int>3</int>        <!-- TODO: unsure -->
      </field>
      <field name="writerTOCDepth">
        <int>3</int>
      </field>
      <field name="writerReferenceODT">
        <string></string>
      </field>
      <field name="writerReferenceDocx">
        <string></string>
      </field>
    </record>
  </field>
  <field name="readerOptions">
    <record name="ReaderOptions">
      <field name="readerExtensions">
        <set />
      </field>
      <field name="readerSmart">
        <int>0</int>
      </field>
      <field name="readerStrict">
        <int>0</int>
      </field>
      <field name="readerStandalone">
        <int>0</int>
      </field>
      <field name="readerParseRaw">
        <int>0</int>
      </field>
      <field name="readerColumns">
        <int>80</int>
      </field>
      <field name="readerTabStop">
        <int>4</int>
      </field>
      <field name="readerOldDashes">
        <int>0</int>
      </field>
      <field name="readerReferences">
        <list />
      </field>
      <field name="readerCitationStyle">
        <string></string>
      </field>
      <field name="readerApplyMacros">
        <int>0</int>
      </field>
      <field name="readerIndentedCodeClasses">
        <list />
      </field>
      <field name="readerDefaultImageExtension">
        <string></string>
      </field>
    </record>
  </field>
</record>

Other Interfaces

Changelog

  • 0.6 - Updated to pandoc version 1.10 and higher
  • 0.5 - Implemented XML generics to support all config settings.

Authors

Anton Tayanovskyy name.surname@gmail.com. Bug reports and feature requests are welcome.

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