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yusanish/scrapbox.lua

Last active December 31, 2017 23:22
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Pandoc (github Markdown -> Scrapbox). Using Custom template, indent does not work correctly. So, I swaped double and triple indented list to "--", before I use pandoc
Raw
scrapbox.lua
-- This is a sample custom writer for pandoc.
-- Scrapbox
-- 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
-- Helper function to convert an attributes table into
-- a string that can be put into HTML tags.
local function attributes(attr)
local attr_table = {}
for x,y in pairs(attr) do
if y and y ~= "" then
table.insert(attr_table, ' ' .. x .. '="' .. escape(y,true) .. '"')
end
end
return table.concat(attr_table)
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
-- remove Note
-- Blocksep is used to separate block elements.
function Blocksep()
return "\n\n"
end
-- This function is called once for the whole document. Parameters:
-- body is a string, metadata is a table, variables is a table.
-- This gives you a fragment. You could use the metadata table to
-- fill variables in a custom lua template. Or, pass `--template=...`
-- to pandoc, and pandoc will add do the template processing as
-- usual.
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 SoftBreak()
return "\n"
end
function LineBreak()
return "\n"
end
function Emph(s)
return "[/ " .. s .. "]"
end
function Strong(s)
return "[[" .. s .. "]]"
end
-- remove Subscript
-- remove Superscript
-- remove SmallCaps
function Strikeout(s)
return '[- ' .. s .. ']'
end
function Link(s, src, tit, attr)
return "[" .. escape(s,true) .. " " .. escape(src,true) .. "]"
end
function Image(s, src, tit, attr)
return "[" .. escape(s,true) .. " " .. escape(src,true) .. "]"
end
function Code(s, attr)
return "`" .. escape(s) .. "`\n"
end
function InlineMath(s)
return "[$ " .. escape(s) .. "]"
end
function DisplayMath(s)
return "[$" .. escape(s) .. "]"
end
function Note(s)
return "((" .. s .. "))"
end
function Span(s, attr)
return attributes(attr) .. s
end
-- function RawInline(format, str)
-- if format == "html" then
-- return str
-- else
-- return ''
-- end
-- end
-- remove Cite
function Plain(s)
return s
end
function Para(s)
return s
end
-- lev is an integer, the header level.
function Header(lev, s, attr)
local buffer = {}
table.insert(buffer, "[")
for i = 1, 5 do
table.insert(buffer, "*")
end
for i = 1, lev do
table.remove(buffer)
end
return table.concat(buffer, "") .. " " .. s .. "]"
end
function BlockQuote(s)
local buffer = {}
local lines = Split(s, "\n")
for _, line in pairs(lines) do
table.insert(buffer, "> " .. line .. "\n")
end
return table.concat(buffer, "")
end
-- remove HorizontalRule
-- remove LineBlock
-- add Split for CodeBlock
function Split(str, pat)
local t = {} -- NOTE: use {n = 0} in Lua-5.0
local fpat = "(.-)" .. pat
local last_end = 1
local s, e, cap = str:find(fpat, 1)
while s do
if s ~= 1 or cap ~= "" then
table.insert(t,cap)
end
last_end = e+1
s, e, cap = str:find(fpat, last_end)
end
if last_end <= #str then
cap = str:sub(last_end)
table.insert(t, cap)
end
return t
end
function CodeBlock(s, attr)
local buffer = {}
local lines = Split(s, "\n")
return "code:temp" .. table.concat(attr, "") .. "\n\t" ..
table.concat(lines, "\n\t") .. "\n"
end
function BulletList(items)
local buffer = {}
for _, item in pairs(items) do
table.insert(buffer, "\t" .. item)
end
return table.concat(buffer, "\n")
end
function OrderedList(items)
local buffer = {}
for _, item in pairs(items) do
table.insert(buffer, "\t" .. item)
end
return table.concat(buffer, "\n")
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, "\t" .. k .. "：" .. table.concat(v, "") .. "\n")
end
end
return table.concat(buffer, "\n")
end
-- remove html Align
-- edit CaptionedImage
function CaptionedImage(src, tit, caption)
return '[' .. escape(caption,true) .. " " .. escape(src,true) .. ']'
end
-- edit
-- 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 = {}
table.insert(buffer, "table:temp")
local function add(s)
table.insert(buffer, s)
end
if caption ~= "" then
add(caption)
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
head = "\t" .. table.concat(header_row, "\t")
end
add(head)
for _, row in pairs(rows) do
local rows = {}
for i,c in pairs(row) do
table.insert(rows, c)
end
add("\t" .. table.concat(rows, "\t"))
end
return table.concat(buffer,'\n')
end
function RawBlock(format, str)
if format == "html" then
return str
else
return ''
end
end
function Div(s, attr)
return s
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)
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