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Jakob Voß
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NAME

Pandoc - wrapper for the mighty Pandoc document converter

SYNOPSIS

  use Pandoc;             # check at first use
  use Pandoc 1.12;        # check at compile time
  Pandoc->require(1.12);  # check at run time

  # execute pandoc
  pandoc 'input.md', -o => 'output.html';
  pandoc -f => 'html', -t => 'markdown', { in => \$html, out => \$md };

  # alternative syntaxes
  pandoc->run('input.md', -o => 'output.html');
  pandoc [ -f => 'html', -t => 'markdown' ], in => \$html, out => \$md;
  pandoc [ -f => 'html', -t => 'markdown' ], { in => \$html, out => \$md };

  # check executable
  pandoc or die "pandoc executable not found";

  # check minimum version
  pandoc->version > 1.12 or die "pandoc >= 1.12 required";

  # access properties
  say pandoc->bin." ".pandoc->version;
  say "Default user data directory: ".pandoc->data_dir;
  say "Compiled with: ".join(", ", keys %{ pandoc->libs });
  say pandoc->libs->{'highlighting-kate'};

  # create a new instance with default arguments
  my $md2latex = Pandoc->new(qw(-f markdown -t latex --smart));
  $md2latex->run({ in => \$markdown, out => \$latex });

  # set default arguments on compile time
  use Pandoc qw(-t latex);
  use Pandoc qw(/usr/bin/pandoc --smart);
  use Pandoc qw(1.16 --smart);


  # utility method to convert from string
  $latex = pandoc->convert( 'markdown' => 'latex', '*hello*' );

  # utility methods to parse abstract syntax tree (requires Pandoc::Elements)
  $doc = pandoc->parse( markdown => '*hello* **world!**' );
  $doc = pandoc->file( 'example.md' );

DESCRIPTION

This module provides a Perl wrapper for John MacFarlane's Pandoc document converter.

IMPORTING

The utility function pandoc is exported, unless the module is imported with an empty list (use Pandoc ();).

Importing this module with a version number or a more complex version requirenment (e.g. use Pandoc 1.13; or use Pandoc '>= 1.6, !=1.7) will check version number of pandoc executable instead of version number of this module (see $Pandoc::VERSION for the latter). Additional import arguments can be passed to set the executable location and default arguments of the global Pandoc instance used by function pandoc.

FUNCTIONS

pandoc

If called without parameters, this function returns a global instance of class Pandoc to execute methods, or undef if no pandoc executable was found. The location and/or name of pandoc executable can be set with environment variable PANDOC_PATH (set to the string pandoc by default).

pandoc( ... )

If called with parameters, this functions runs the pandoc executable configured at the global instance of class Pandoc (pandoc->bin). Arguments are passed as command line arguments and options control input, output, and error stream as described below. Returns 0 on success. Otherwise returns the the exit code of pandoc executable or -1 if execution failed. Arguments and options can be passed as plain array/hash or as (possibly empty) reference in the following ways:

  pandoc @arguments, \%options;     # ok
  pandoc \@arguments, %options;     # ok
  pandoc \@arguments, \%options;    # ok
  pandoc @arguments;                # ok, if first of @arguments starts with '-'
  pandoc %options;                  # ok, if %options is not empty

  pandoc @arguments, %options;      # not ok!

Options

in / out / err

These options correspond to arguments $stdin, $stdout, and $stderr of IPC::Run3, see there for details.

binmode_stdin / binmode_stdout / binmode_stderr

These options correspond to the like-named options to IPC::Run3, see there for details.

binmode

If defined any binmode_stdin/binmode_stdout/binmode_stderr option which is undefined will be set to this value.

return_if_system_error

Set to true by default to return the exit code of pandoc executable.

For convenience the pandoc function (after checking the binmode option) checks the contents of any scalar references passed to the in/out/err options with utf8::is_utf8() and sets the binmode_stdin/binmode_stdout/binmode_stderr options to :encoding(UTF-8) if the corresponding scalar is marked as UTF-8 and the respective option is undefined. Since all pandoc executable input/output must be UTF-8 encoded this is convenient if you run with use utf8, as you then don't need to set the binmode options at all (encode nor decode) when passing input/output scalar references.

METHODS

new( [ $executable ] [, @arguments ] )

Create a new instance of class Pandoc or throw an exception if no pandoc executable was found. The first argument, if given and not starting with -, can be used to set the pandoc executable (pandoc by default). Additional arguments are passed to the executable on each run.

Repeated use of this constructor with same arguments is not recommended because pandoc --version is called for every new instance.

run( ... )

Execute the pandoc executable with default arguments and optional additional arguments and options. See function pandoc for usage.

convert( $from => $to, $input [, @arguments ] )

Convert a string in format $from to format $to. Additional pandoc options such as --smart and --standalone can be passed. The result is returned in same utf8 mode (utf8::is_unicode) as the input. To convert from file to string use method pandoc/run like this and set input/output format via standard pandoc arguments -f and -t:

  pandoc->run( $filename, @arguments, { out => \$string } );

parse( $from => $input [, @arguments ] )

Parse a string in format $from to a Pandoc::Document object. Additional pandoc options such as --smart and --normalize can be passed. This method requires at least pandoc version 1.12.1 and the Perl module Pandoc::Elements.

The reverse action is possible with method to_pandoc of Pandoc::Document. Additional shortcut methods such as to_html are available:

  $html = pandoc->parse( 'markdown' => '# A *section*' )->to_html;

Method convert should be preferred for simple conversions unless you want to modify or inspect the parsed document in between.

file( $filename [, @arguments ] )

Parse from a file to a Pandoc::Document object. Additional pandoc options can be passed, for instance use HTML input format (@arguments = qw(-f html)) instead of default markdown. This method Requires at least pandoc version 1.12.1 and the Perl module Pandoc::Elements.

require( $version_requirement )

Return the Pandoc instance if its version number fulfills a given version requirement. Throw an error otherwise. Can also be called as constructor: Pandoc->require(...) is equivalent to pandoc->require but throws a more meaningful error message if no pandoc executable was found.

version( [ $version_requirement ] )

Return the pandoc version as Pandoc::Version object. If a version requirement is given, the method returns undef if the pandoc version does not fulfill this requirement. To check whether pandoc is available with a given minimal version use one of:

  Pandoc->require( $minimum_version)                # true or die
  pandoc and pandoc->version( $minimum_version )    # true or false

bin( [ $executable ] )

Return or set the pandoc executable. Setting an new executable also updates version and data_dir by calling pandoc --version.

arguments( [ @arguments | \@arguments )

Return or set a list of default arguments.

data_dir

Return the default data directory (only available since Pandoc 1.11).

input_formats

Return a list of supported input formats.

output_formats

Return a list of supported output formats.

highlight_languages

Return a list of programming languages which syntax highlighting is supported for (via Haskell library highlighting-kate).

libs

Return a hash mapping the names of Haskell libraries compiled into the pandoc executable to Pandoc::Version objects.

SEE ALSO

See Pandoc::Elements for a Perl interface to the abstract syntax tree of Pandoc documents for more elaborate document processing.

See Pandoc wrappers and interfaces in the Pandoc GitHub Wiki for a list of wrappers in other programming languages.

Other Pandoc related but outdated modules at CPAN include Orze::Sources::Pandoc and App::PDoc.

AUTHOR

Jakob Voß

CONTRIBUTORS

Benct Philip Jonsson

LICENSE

GNU General Public License, Version 2