-- Invoke with: pandoc -t sample.lua

-- Blocksep is used to separate block elements.

function Blocksep()

return "\n\n"

end

-- This function is called once for the whole document. Parameters:

-- body, title, date are strings; authors is an array of strings;

-- variables is a table. One could use some kind of templating

-- system here; this just gives you a simple standalone HTML file.

function Doc(body, title, authors, date, variables)

return body .. '\n'

end

-- The functions that follow render corresponding pandoc elements.

-- s is always a string, attr is always a table of attributes, and

-- items is always an array of strings (the items in a list).

-- Comments indicate the types of other variables.

function Str(s)

return s

end

function Space()

return " "

end

function LineBreak()

return "\n"

end

function Emph(s)

return "[em]" .. s .. "[/em]"

end

function Strong(s)

return "[b]" .. s .. "[/b]"

end

function Subscript(s)

error("Subscript isn't supported")

end

function Superscript(s)

error("Superscript isn't supported")

end

function SmallCaps(s)

error("SmallCaps isn't supported")

end

function Strikeout(s)

return '[del]' .. s .. '[/del]'

end

function Link(s, src, tit)

local ret = '[url'

if s then

ret = ret .. '=' .. src

else

s = src

end

ret = ret .. "]" .. s .. "[/url]"

end

function Image(s, src, tit)

return "[img=" .. tit .. "]" .. src .. "[/img]"

end

function Code(s, attr)

return "[u]" .. s .. "[/u]"

end

function InlineMath(s)

error("InlineMath isn't supported")

end

function DisplayMath(s)

error("DisplayMath isn't supported")

end

function Note(s)

error("Note isn't supported")

end

function Plain(s)

return s

end

function Para(s)

return s

end

-- lev is an integer, the header level.

function Header(lev, s, attr)

return "[h]" .. s .. "[/h]"

end

function BlockQuote(s)

return "[quote]\n" .. s .. "\n[/quote]"

end

function HorizontalRule()

return "--------------------------------------------------------------------------------"

end

function CodeBlock(s, attr)

return "[code]\n" .. s .. '\n[/code]'

end

function BulletList(items)

local buffer = {}

for _, item in ipairs(items) do

table.insert(buffer, "[*]" .. item)

end

return "[list]\n" .. table.concat(buffer, "\n") .. "\n[/list]"

end

function OrderedList(items)

local buffer = {}

for _, item in ipairs(items) do

table.insert(buffer, "[*]" .. item)

end

return "[list=1]\n" .. table.concat(buffer, "\n") .. "\n[/list]"

end

-- Revisit association list STackValue instance.

function DefinitionList(items)

local buffer = {}

for _, item in pairs(items) do

for k, v in pairs(item) do

table.insert(buffer, "[b]" .. k .. "[/b]:\n" ..

table.concat(v, "\n"))

end

end

return table.concat(buffer, "\n")

end

-- Convert pandoc alignment to something HTML can use.

-- align is AlignLeft, AlignRight, AlignCenter, or AlignDefault.

function html_align(align)

if align == 'AlignLeft' then

return 'left'

elseif align == 'AlignRight' then

return 'right'

elseif align == 'AlignCenter' then

return 'center'

else

return 'left'

end

end

-- Caption is a string, aligns is an array of strings,

-- widths is an array of floats, headers is an array of

-- strings, rows is an array of arrays of strings.

function Table(caption, aligns, widths, headers, rows)

error("Table isn't supported")

end

-- The following code will produce runtime warnings when you haven't defined

-- all of the functions you need for the custom writer, so it's useful

-- to include when you're working on a writer.

local meta = {}

meta.__index =

function(_, key)

io.stderr:write(string.format("WARNING: Undefined function '%s'\n",key))

return function() return "" end

end

setmetatable(_G, meta)