Skip to content

Instantly share code, notes, and snippets.

@yurrriq
Forked from zhzhxtrrk/wiki.lua
Created April 10, 2019 15:19
Show Gist options
  • Save yurrriq/cfd7410eb21327aaa51b67e30584a354 to your computer and use it in GitHub Desktop.
Save yurrriq/cfd7410eb21327aaa51b67e30584a354 to your computer and use it in GitHub Desktop.
pandoc confluence markup writer
-- that is very similar to that of pandoc's HTML writer.
-- There is one new feature: code blocks marked with class 'dot'
-- are piped through graphviz and images are included in the HTML
-- output using 'data:' URLs.
--
-- Invoke with: pandoc -t sample.lua
--
-- Note: you need not have lua installed on your system to use this
-- custom writer. However, if you do have lua installed, you can
-- use it to test changes to the script. 'lua sample.lua' will
-- produce informative error messages if your code contains
-- syntax errors.
local image_index = 0
-- Character escaping
local function escape(s, in_attribute)
return s:gsub("[<>&\"']",
function(x)
if x == '<' then
return '&lt;'
elseif x == '>' then
return '&gt;'
elseif x == '&' then
return '&amp;'
elseif x == '"' then
return '&quot;'
elseif x == "'" then
return '&#39;'
else
return x
end
end)
end
-- Run cmd on a temporary file containing inp and return result.
local function pipe(cmd, inp)
local tmp = os.tmpname()
local tmph = io.open(tmp, "w")
tmph:write(inp)
tmph:close()
local outh = io.popen(cmd .. " " .. tmp,"r")
local result = outh:read("*all")
outh:close()
os.remove(tmp)
return result
end
-- Blocksep is used to separate block elements.
function Blocksep()
return "\n"
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)
table.insert(buffer, s)
end
add(body)
return table.concat(buffer,'\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 escape(s)
end
function Space()
return " "
end
function LineBreak()
return "\n"
end
function Para(s)
return s .. "\n"
end
function Plain(s)
return s
end
function Emph(s)
return "_" .. s .. "_"
end
function Strong(s)
return "*" .. s .. "*"
end
function Subscript(s)
return "~" .. s .. "~"
end
function Superscript(s)
return "^" .. s .. "^"
end
function Strikeout(s)
return '-' .. s .. '-'
end
function Link(s, src, tit)
return "[" .. s .. "|" .. escape(src,true) .. " " .. escape(tit,true) .. "]"
end
function CaptionedImage(src, s, tit)
image_index = image_index + 1
return "!" .. escape(src, true) .. "!\n" .. 'FIGURE ' .. image_index .. ". " .. tit .. "\n"
end
function Image(s, src, tit)
return "!" .. escape(src,true) .. "!"
end
-- lev is an integer, the header level.
function Header(lev, s, attr)
return "h" .. lev .. ". " .. s .. ""
end
function BlockQuote(s)
return "{quote}\n" .. s .. "\n{quote}"
end
function HorizontalRule()
return "----"
end
function Code(s)
return '{{' .. s .. '}}'
end
function CodeBlock(s, attr)
return "{code:" .. attr["class"] .. "}" .. s .. "{code}"
end
function BulletList(items)
local buffer = {}
for _, item in pairs(items) do
table.insert(buffer, "* " .. item .. "")
end
return "\n" .. table.concat(buffer, "") .. "\n"
end
function OrderedList(items)
local buffer = {}
for _, item in pairs(items) do
table.insert(buffer, "# " .. item .. "")
end
return "\n" .. table.concat(buffer, "") .. "\n"
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)
local buffer = {}
local function add(s)
table.insert(buffer, s)
end
local header_row = {}
local empty_header = true
for i, h in pairs(headers) do
table.insert(header_row, h)
empty_header = empty_header and h == ""
end
if empty_header then
head = ""
else
add('|| ' .. table.concat(header_row, ' || ') .. ' ||')
end
for _, row in pairs(rows) do
add('| ' .. table.concat(row, ' | ') .. ' |')
end
return "\n" .. table.concat(buffer,'\n') .. "\n"
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)
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment