Module:SummarySnippet

Documentation for this module may be created at Module:SummarySnippet/doc

local p = {}

-- Trims whitespace from a string
local function trim(s)
	return s:match("^%s*(.-)%s*$")
end

function p.fromPage(frame)
	local page = frame.args[1]
	local length = tonumber(frame.args[2]) or 150

	if not page or page == '' then
		return "No page name provided."
	end

	-- Fetch the raw wikitext
    local raw = mw.ustring.match(page, "%[%[(.-)%]%]") or page
    local pageText = mw.text.split(raw, "|")[1]

	local content = mw.title.new(pageText)
	if not content or not content.exists then
		return "Page not found."
	end

	local text = content:getContent()
	if not text then
		return "No content."
	end

	-- Strip templates and most formatting
	text = mw.text.killMarkers(text)
	text = mw.ustring.gsub(text, '{{.-}}', '') -- remove templates
	text = mw.ustring.gsub(text, '%[%[.-%|', '') -- remove link alt text
	text = mw.ustring.gsub(text, '%[%[', '') -- remove double bracket
	text = mw.ustring.gsub(text, '%]%]', '') -- remove double bracket
	text = mw.ustring.gsub(text, "''+", "") -- remove italics/bold

	-- Remove MediaWiki headers like == Header ==
	text = mw.ustring.gsub(text, "\n=*.-=*%s*\n", "\n")

	-- Collapse whitespace
	text = text:gsub("\n", " ")
	text = text:gsub("%s+", " ")
	text = trim(text)

	-- Return truncated string
	if #text > length then
		return mw.ustring.sub(text, 1, length) .. "..."
	else
		return text
	end
end

return p