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pagebreak.lua

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  • pagebreak.lua 3.37 KiB
    --[[
    pagebreak – convert raw LaTeX page breaks to other formats
    
    Copyright © 2017-2020 Benct Philip Jonsson, Albert Krewinkel
    
    Permission to use, copy, modify, and/or distribute this software for any
    purpose with or without fee is hereby granted, provided that the above
    copyright notice and this permission notice appear in all copies.
    
    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
    WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
    MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
    ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
    ]]
    local stringify_orig = (require 'pandoc.utils').stringify
    
    local function stringify(x)
      return type(x) == 'string' and x or stringify_orig(x)
    end
    
    --- configs – these are populated in the Meta filter.
    local pagebreak = {
      epub = '<p style="page-break-after: always;"> </p>',
      html = '<div style="page-break-after: always;"></div>',
      latex = '\\newpage{}',
      ooxml = '<w:p><w:r><w:br w:type="page"/></w:r></w:p>',
      odt = '<text:p text:style-name="Pagebreak"/>'
    }
    
    local function pagebreaks_from_config (meta)
      local html_class =
        (meta.newpage_html_class and stringify(meta.newpage_html_class))
        or os.getenv 'PANDOC_NEWPAGE_HTML_CLASS'
      if html_class and html_class ~= '' then
        pagebreak.html = string.format('<div class="%s"></div>', html_class)
      end
    
      local odt_style =
        (meta.newpage_odt_style and stringify(meta.newpage_odt_style))
        or os.getenv 'PANDOC_NEWPAGE_ODT_STYLE'
      if odt_style and odt_style ~= '' then
        pagebreak.odt = string.format('<text:p text:style-name="%s"/>', odt_style)
      end
    end
    
    --- Return a block element causing a page break in the given format.
    local function newpage(format)
      if format == 'docx' then
        return pandoc.RawBlock('openxml', pagebreak.ooxml)
      elseif format:match 'latex' then
        return pandoc.RawBlock('tex', pagebreak.latex)
      elseif format:match 'odt' then
        return pandoc.RawBlock('opendocument', pagebreak.odt)
      elseif format:match 'html.*' then
        return pandoc.RawBlock('html', pagebreak.html)
      elseif format:match 'epub' then
        return pandoc.RawBlock('html', pagebreak.epub)
      else
        -- fall back to insert a form feed character
        return pandoc.Para{pandoc.Str '\f'}
      end
    end
    
    local function is_newpage_command(command)
      return command:match '^\\newpage%{?%}?$'
        or command:match '^\\pagebreak%{?%}?$'
    end