Module:SummarySnippet

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

local p = {}

-- Trim leading/trailing whitespace
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

	-- Parse link-style input
	local raw = mw.ustring.match(page, "%[%[(.-)%]%]") or page
	local pageText = mw.text.split(raw, "|")[1]

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

	-- Use MediaWiki parser to preprocess and expand the page content
	local expanded = frame:preprocess('{{:' .. pageText .. '}}')
	if not expanded then
		return "No content."
	end

	-- Attempt to skip content before the first section (e.g., infobox/template blob)
	local body = mw.ustring.match(expanded, "==.*") or expanded

	-- Clean up formatting
	body = mw.text.killMarkers(body)
	body = mw.ustring.gsub(body, '%[%[(.-)%|(.-)%]%]', '%2') -- [[Page|Label]] → Label
	body = mw.ustring.gsub(body, '%[%[', '')                 -- [[Page]] → Page
	body = mw.ustring.gsub(body, '%]%]', '')
	body = mw.ustring.gsub(body, "''+", "")                  -- remove bold/italics
	body = mw.ustring.gsub(body, "=+%s*(.-)%s*=+", "")       -- remove section headers
	body = mw.ustring.gsub(body, "{{.-}}", "")               -- remove remaining inline templates

	-- Normalize whitespace
	body = body:gsub("\n", " ")
	body = body:gsub("%s+", " ")
	body = trim(body)

	if body == "" then
		return "No description available."
	end

	local truncated = mw.ustring.sub(body, 1, length)
	if #body > length then
		truncated = truncated .. "..."
	end

	return truncated
end

return p