Module:Category handler

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This module may be invoked by templates using its corresponding template Template:Category handler, or used directly from other modules.
Module:Category handler is ready for use. This message indicates that a module is ready for use, or has recently been repaired. This message may be removed once this module has been used on several pages or once it is verified to work as intended.

Details: Functionally complete. Default lists may be adjusted still.

Introspection summary for Module:Category handler 
Functions provided (2)
Line Function Params
130 _category_handler (main) (cats, ns_override, suffixes_override, is_debug)
175 category_handler (invokable) (frame)
Lua modules required (2)
Variable Module Functions used
getArgs Module:Arguments getArgs
yesno Module:Yesno yesno

No function descriptions were provided. The Lua code may have further information. 

local getArgs = require("Module:Arguments").getArgs
local yesno = require("Module:Yesno")

local p = {}

-- Basic category handler, based on Wikipedia's category handler. It categorizes
-- pages, given a table of categories as input, and suppresses categorization if
-- the page is in the table of excluded namespaces.
-- The most common categorizing templates that have/require complex rules are:
-- - Infoboxes; these usually shouldn't categorize if they're outside the main
--   namespace.
-- - Certain mboxes; some mboxes categorize certain pages, but they shouldn't
--   categorize their own documentation.

-- Default list of namespaces in which to suppress categorization. Most
-- categorizing templates are expected to be placed in main, template, or
-- module; those that don't are likely special-use templates (like idiosyncratic
-- and editable user page) which likely won't need this module, or templates
-- with very basic categorization rules for which this is overkill.
-- Adjust as needed!
local DEFAULT_SUPPRESSED_NAMESPACES = {
    ["talk"] = true,
    ["user"] = true,
    ["user talk"] = true,
    ["file talk"] = true,
    ["mediawiki talk"] = true,
    ["template talk"] = true,
    ["help"] = true,
    ["help talk"] = true,
    ["category talk"] = true,
    ["module talk"] = true,
    ["xenharmonic wiki"] = true,
    ["xenharmonic wiki talk"] = true,
    ["media"] = true,
}
-- Inversely, the following namespaces are unsuppressed: main, file, mediawiki,
-- template, category, module

-- Default list of page suffixes in which to suppress categorization.
-- Adjust as needed!
local DEFAULT_SUPPRESSED_SUFFIXES = {
	"doc",
	"sandbox",
}

-- Helper function: check if current namespace is excluded
-- Accepts an optional table, containing or overriding other namespaces' rules
local function is_suppressed_namespace(title, ns_override)
	local ns_text

	if type(title) == "table" and title.nsText then
		ns_text = mw.ustring.lower(title.nsText or '')
	elseif type(title) == "string" then
		ns_text = mw.ustring.lower(title)
	else
		ns_text = mw.ustring.lower(mw.title.getCurrentTitle().nsText or '')
	end

	local namespaces = {}
	for k, v in pairs(DEFAULT_SUPPRESSED_NAMESPACES) do
		namespaces[k] = v
	end

	if type(ns_override) == "table" then
		for k, v in pairs(ns_override) do
			namespaces[k] = v
		end
	end

	return namespaces[ns_text] or false
end

-- Helper function
-- Checks whether the page title ends in a suppressed suffix
-- Accepts an opiontal table, containing additional suffixes to suppress
-- Suffix and custom suffixes are lowercased to guarantee matching
local function has_suppressed_suffix(title, suffixes_override)
	local title_obj

	if type(title) == "table" and title.text then
		title_obj = title
	elseif type(title) == "string" then
		title_obj = mw.title.new(title)
	else
		title_obj = mw.title.getCurrentTitle()
	end

	local pagename = mw.ustring.lower(title_obj.text or '')
	local suffixes = {}

	-- Include default suppressed suffixes
	for _, suffix in ipairs(DEFAULT_SUPPRESSED_SUFFIXES) do
		table.insert(suffixes, suffix)
	end

	-- Add custom overrides
	if type(suffixes_override) == "table" then
		for _, suffix in ipairs(suffixes_override) do
			table.insert(suffixes, suffix)
		end
	end

	-- Check if the page name ends with any of the suffixes (as subpages)
	for _, suffix in ipairs(suffixes) do
		suffix = mw.text.trim(mw.ustring.lower(suffix or ''))
		if suffix ~= '' then
			local pattern = '/' .. mw.ustring.gsub(suffix, '([%^%$%(%)%%%.%[%]%*%+%-%?])', '%%%1') .. '$'
			if mw.ustring.match(pagename, pattern) then
				return true
			end
		end
	end

	return false
end

-- Helper function: strips suffix from title
local function strip_suffix(title, suffix)
    local text = title.text
    if mw.ustring.sub(text, -mw.ustring.len(suffix)) == suffix then
        return mw.title.new(mw.ustring.sub(text, 1, -mw.ustring.len(suffix)-1), title.ns)
    end
    return title
end

-- "Main" function; can be called by other modules
-- Categorizes a page, given a table of categories
-- Disallows categories if it's in a suppressed namespace or the page has a
-- suppressed suffix (subpage)
function p._category_handler(cats, ns_override, suffixes_override, is_debug)
    cats = cats or {}
    is_debug = yesno(is_debug, false)

    local frame = mw.getCurrentFrame()
    local parent_frame = frame:getParent()
    local parent_title = parent_frame and mw.title.new(parent_frame:getTitle()) or mw.title.getCurrentTitle()

    -- If parent page is a documentation subpage (e.g. ends with /doc), switch to base page
    parent_title = strip_suffix(parent_title, "/doc")

    local suppressed_ns = is_suppressed_namespace(parent_title, ns_override)
    local suppressed_suffix = has_suppressed_suffix(parent_title, suffixes_override)
    local is_content = parent_title.isContentPage

    if is_debug or suppressed_ns or suppressed_suffix or not is_content then
        local reason = is_debug and "debug mode"
            or (suppressed_ns and "suppressed namespace")
            or (suppressed_suffix and "suppressed suffix")
            or (not is_content and "non-content page")
            or "unknown"

        -- Return a debug comment explaining why categorization was suppressed
        return string.format(
            "<!-- categorization suppressed: %s; is_debug=%s; suppressed_ns=%s; suppressed_suffix=%s; is_content=%s -->",
            reason,
            tostring(is_debug),
            tostring(suppressed_ns),
            tostring(suppressed_suffix),
            tostring(is_content)
        )
    end

    local result = ''
    for _, cat in ipairs(cats) do
        cat = mw.text.trim(cat or '')
        if cat ~= '' then
            result = result .. string.format('[[Category:%s]]', cat)
        end
    end

    return result
end

-- Wrapper for templates calling via #invoke
function p.category_handler(frame)
	local args = getArgs(frame)
	local cats_unparsed        = args["categories"] or ""
	local excluded_ns_unparsed = args["excluded_ns"] or ""
	local suffixes_unparsed    = args["suffixes"] or ""
	local is_debug             = yesno(args["debug"], false)

	-- Parse categories
	local cats = {}
	for cat in mw.text.gsplit(cats_unparsed, "[,\n]") do
		cat = mw.text.trim(cat)
		if cat ~= "" then
			table.insert(cats, cat)
		end
	end

	-- Parse excluded namespaces (added/overrides default)
	local ns_override = {}
	for ns in mw.text.gsplit(excluded_ns_unparsed, "[;\n]") do
		ns = mw.text.trim(ns)
		if ns ~= "" then
			ns_override[ns] = true
		end
	end

	-- Parse excluded suffixes
	local suffixes = {}
	for suffix in mw.text.gsplit(suffixes_unparsed, "[;\n]") do
		suffix = mw.text.trim(suffix)
		if suffix ~= "" then
			table.insert(suffixes, suffix)
		end
	end

	return p._category_handler(cats, ns_override, suffixes, is_debug)
end

return p
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