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|
-- Pandoc River writer
-- it takes out all formatting, leaving only a river of text
-- running down the page: one word per line
-- vim: fdm=marker
-- invoke with: pandoc -t river.lua
os.setlocale("en_US.UTF-8")
local function flow(s)
return s:gsub("%s+", "\n")
end
local function nude(s)
-- Expand contractions
s = s:gsub("'%a+%s", function (x)
if x == "'ll" then
return " will "
elseif x == "'ve" then
return " have "
elseif x == "'re" then
return " are "
else
return x
end
end)
s = s:gsub("it's", "it is")
s = s:gsub("n't", " not ")
-- Get rid of quotes around words
s = s:gsub('"', ' ')
s = s:gsub("%s+'", ' ')
s = s:gsub("'%s+", ' ')
-- Remove HTML entities
s = s:gsub('&.-;', ' ')
s = s:gsub('%b<>', ' ')
-- Remove end-of-line backslashes
s = s:gsub('%s+\\$', ' ')
-- Remove dashes (not hyphens)
s = s:gsub('%-%-+', ' ')
s = s:gsub('%-%s', ' ')
-- Remove everything that is not letters or numbers
s = s:gsub('[%.!%?:;,%[%]%(%)<>]', ' ')
-- Remove extra spaces
s = s:gsub('%s+', ' ')
return s:lower()
end
-- This function is called once for the whole document. Parameters:
-- body is a string, metadata is a table, 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, metadata, variables)
local buffer = ""
local function add(s)
buffer = buffer .. nude(s) .. "\n"
end
if metadata['title'] then
add(metadata['title'])
end
if metadata['subtitle'] then
add(metadata['subtitle'])
end
-- TODO: epigraph.content, epigraph.attrib, dedication, other metadata?
add(body)
return flow(buffer)
end
-- Remove all formatting {{{
function Note(s)
return nude(s)
end
function Blocksep()
return "\n"
end
function Emph(s)
return nude(s)
end
function Strong(s)
return nude(s)
end
function Subscript(s)
return nude(s)
end
function Superscript(s)
return nude(s)
end
function SmallCaps(s)
return nude(s)
end
function Strikeout(s)
return nude(s)
end
function Code(s, attr)
return nude(s)
end
function CodeBlock(s, attr)
return nude(s)
end
function InlineMath(s)
return nude(s)
end
function DisplayMath(s)
return nude(s)
end
function Span(s, attr)
return nude(s)
end
function Cite(s)
return nude(s)
end
function Plain(s)
return nude(s)
end
-- Links only include the link text
function Link(s, src, tit)
return nude(s)
end
-- Images have nothing to give us
-- (but add a space just in case)
function Image(s, src, tit)
return "\n"
end
function CaptionedImage(s, src, tit)
return "\n"
end
function Str(s)
return nude(s)
end
function Div(s, attr)
return nude(s)
end
function Space(s)
return "\n"
end
function LineBreak()
return "\n"
end
function Para(s)
return nude(s)
end
function Header(lev, s, attr)
return nude(s)
end
function BlockQuote(s)
return nude(s)
end
function HorizontalRule()
return "\n"
end
function BulletList(items)
local buffer = ""
for _, item in pairs(items) do
buffer = buffer .. nude(item) .. "\n"
end
return buffer .. "\n"
end
function OrderedList(items)
local buffer = ""
for _, item in pairs(items) do
buffer = buffer .. nude(item) .. "\n"
end
return buffer .. "\n"
end
function DefinitionList(items)
local buffer = ""
for _, item in pairs(items) do
for k, v in pairs(item) do
buffer = buffer .. nude(k) .. "\n" .. nude(v) .. "\n"
end
end
return buffer .. "\n"
end
function Table(caption, aligns, widths, headers, rows)
local buffer = ""
local function add(s)
buffer = buffer .. nude(s) .. "\n"
end
if caption ~= "" then
add(caption)
end
for _,h in pairs(headers) do
add(h)
end
for _, row in pairs(rows) do
for _, cell in pairs(row) do
add(cell)
end
end
return buffer
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)
|
