Module:Dochead

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This module should not be invoked directly; use its corresponding template instead.

Module:Dochead 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. Edge-case observations still ongoing. Links can now be viewed on /doc pages.

Introspection summary for Module:Dochead
Functions provided (4) Line Function Params 21 page_exists (fullpagename) 31 categorize (namespace, pagename, is_lua_based_template) 57 _dochead (main) (args) 144 dochead (invokable) (frame)	Lua modules required (1) Variable Module Functions used getArgs Module:Arguments getArgs

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

---

-- This module follows [[User:Ganaram inukshuk/Provisional style guide for Lua]]
local getArgs = require("Module:Arguments").getArgs

local p = {}

-- Produces a hatnote that is placed on the top of a documentation page (either
-- template or module documentation) and can autodetect and categorize:
-- - FOR MODULES:
--   - whether a module has an accompanying template (overridable)
--   - whether a module is meant as a library for other modules
-- - FOR TEMPLATES:
--   - whether a template has an accompanying module (overridable)
--   - what functions from which modules are invoked

-- Options for specific types of templates and modules include:
-- - (TEMPLATES) whether it's a metatemplate
-- - (MODULES) whether it's a metamodule (used the same way as a metatemplate,
--   but direct use of module code is allowed)

-- Detect whether a page exists, where pagename is "Namespace:Title"
function p.page_exists(fullpagename)
	local title = mw.title.new(fullpagename)
	
	if title and title.exists then
		return true
	else
		return false
	end
end

function p.categorize(namespace, pagename, is_lua_based_template)
	local is_lua_based_template = is_lua_based_template or false
	local cats = ""

	if pagename:sub(-4) == "/doc" then
		-- Documentation subpages
		if namespace == "Template" then
			cats = "[[Category:Template documentation]]"
		elseif namespace == "Module" then
			cats = "[[Category:Module documentation]]"
		end
	else
		-- Main pages
		if namespace == "Template" then
			cats = "[[Category:Templates]]"
			if is_lua_based_template then
				cats = cats .. " [[Category:Lua-based templates]]"
			end
		elseif namespace == "Module" then
			cats = "[[Category:Lua modules]]"
		end
	end

	return cats
end

function p._dochead(args)
	local namespace = args["namespace"]
	local pagename  = args["pagename"]
	local header    = args["header"] or "none"
	local corr_template = args["temp"] or ("Template:" .. pagename)
	local corr_module   = args["mod"]  or ("Module:"   .. pagename)

	-- If header is none, don't bother
	if header == "none" then
		return p.categorize(namespace, pagename)
	end

	local result = ""
	local has_template = p.page_exists(corr_template)
	local has_module   = p.page_exists(corr_module)

	-- Handle each header type first
	if header == "dualuse" then
		if namespace == "Module" then
			if has_template then
				result = string.format("This module may be invoked by templates using its corresponding [[%s|template]], or used directly from other modules.", corr_template)
			else
				result = header
			end
		else
			result = "This template or its options is in the wrong namespace. It should be used within the Module namespace."
		end

	elseif header == "metatemplate" then
		if namespace == "Module" then
			if has_template then
				result = string.format("This module implements a metatemplate, and may be invoked by templates using its corresponding [[%s|template]], or used directly from other modules.", corr_template)
			else
				result = "This module implements a metatemplate."
			end
		elseif namespace == "Template" then
			if has_module then
				result = string.format("This template is a metatemplate. It is used to build other templates and should not be used standalone, except for testing or simple usage. This template is implemented by the Lua module [[%s]].", corr_module)
			else
				result = "This template is a metatemplate. It is used to build other templates and should not be used standalone, except for testing or simple usage."
			end
		else
			result = "This template or its options is in the wrong namespace. It should be within the Template or Module namespaces."
		end

	elseif header == "noinvoke" then
		if namespace == "Module" then
			if has_template then
				result = string.format("This module should not be invoked directly; use its corresponding [[%s|template]] instead.", corr_template)
			else
				result = header
			end
		else
			result = "This template or its options is in the wrong namespace. It should be used within the Module namespace."
		end

	elseif header == "library" or header == "metamodule" then
		if namespace == "Module" then
			result = "This module primarily serves as a library for other modules."
		else
			result = "This template or its options is in the wrong namespace. It should be used within the Module namespace."
		end

	else
		if namespace == "Module" then
			if has_template then
				result = string.format("%s This module implements [[%s]].", header, corr_template)
			else
				result = header
			end
		elseif namespace == "Template" then
			if has_module then
				result = string.format("%s This template is implemented by the Lua module [[%s]].", header, corr_module)
			else
				result = header
			end
		else
			result = "This template or its options is in the wrong namespace. It should be used within the Template or Module namespaces."
		end
	end

	-- Append categorization info
	local has_link = (namespace == "Module" and has_template)
		or (namespace == "Template" and has_module)
	return string.format(":%s %s", result, p.categorize(namespace, pagename, has_link))
end

function p.dochead(frame)
	local args = getArgs(frame, { removeBlanks = true }) or {}
	local title = mw.title.getCurrentTitle()

	args["namespace"] = args["namespace"] or title.nsText
	args["pagename"]  = args["pagename"]  or title.text
	args["header"]    = args["header"]    or args["namespace"] == "Module" and "noinvoke" or ""
	args["temp"]      = args["temp"]      or ("Template:" .. args["pagename"])
	args["mod"]       = args["mod"]       or ("Module:" .. args["pagename"])
	

	return p._dochead(args)
end

return p