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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
-
-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)
-    -- 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 general punctuation
-    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)
-