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-- Define constants
local ROOT_PAGE = 'Module:Find sources'
local TEMPLATE_ROOT = ROOT_PAGE .. '/templates/' -- for template config modules
local LINK_ROOT = ROOT_PAGE .. '/links/' -- for link config modules
local AUTODOC_SUFFIX = '/autodoc'
 
-- Load necessary modules.
local mFindSources = require('Module:Find sources')
local cfg = mw.loadData('Module:Find sources/autodoc/config')
 
local p = {}
 
local function maybeLoadData(page)
	local success, data = pcall(mw.loadData, page)
	return success and data
end
 
local function substituteParams(msg, ...)
	return mw.message.newRawMessage(msg, ...):plain()
end
 
local function escapePattern(s)
	return s:gsub('%p', '%%%0')
end
 
local function getPrefixPagenames(prefix)
	local specialText = string.format('{{Special:PrefixIndex/%s}}', prefix)
	specialText = mw.getCurrentFrame():preprocess(specialText)
	specialText = mw.text.unstrip(specialText)
	local pagenames = {}
	for s in string.gmatch(specialText, '<a href="[^"]*" title="([^"]*)"[^>]*>[^<]*</a>') do
		pagenames[#pagenames + 1] = mw.text.decode(s)
	end
	return pagenames
end
 
local function getSubpages(pagenames, prefix)
	local stripped = {}
	for i, page in ipairs(pagenames) do
		local pattern = '^' .. escapePattern(prefix) -- Turn the prefix into a Lua pattern
		stripped[i] = mw.ustring.gsub(page, pattern, '')
	end
	return stripped
end
 
local function getPrefixSubpages(prefix)
	return getSubpages(getPrefixPagenames(prefix), prefix)
end
 
local function getFilteredPrefixSubpages(prefix)
	-- Filter out unwanted pages from the subpage list. For now, this means
	-- the autodoc pages.
	local subpages = getPrefixSubpages(prefix)
	local pattern = escapePattern(AUTODOC_SUFFIX) .. '$'
	local filtered = {}
	for _, subpage in ipairs(subpages) do
		if not mw.ustring.find(subpage, pattern) then
			filtered[#filtered + 1] = subpage
		end
	end
	return filtered
end	
 
local function isValidLinkCfg(linkCfg)
	if type(linkCfg) ~= 'table' then
		return false
	end
	for _, s in ipairs{'url', 'display'} do
		if type(linkCfg[s]) ~= 'string' then
			return false
		end
	end
	for _, s in ipairs{'separator'} do
		if linkCfg[s] ~= nil and type(linkCfg[s]) ~= 'string' then
			return false
		end
	end
	return true
end
 
local function isValidLink(code)
	if type(code) ~= 'string' or code == '' then
		return false
	end
	local linkCfg = maybeLoadData(LINK_ROOT .. code)
	return isValidLinkCfg(linkCfg)
end
 
local function isValidTemplateCfg(templateCfg)
	if type(templateCfg) ~= 'table' then
		return false
	end
	for _, s in ipairs{'blurb'} do
		if type(templateCfg[s]) ~= 'string' then
			return false
		end
	end
	for _, s in ipairs{'separator', 'class', 'style'} do
		if templateCfg[s] ~= nil and type(templateCfg[s]) ~= 'string' then
			return false
		end
	end
	if templateCfg[s] and templateCfg[s] ~= true then
		return false
	end
	if type(templateCfg.links) ~= 'table' then
		return false
	end
 
	local function isValidLinkTable(t)
		if type(t) ~= 'table' then
			return false
		end
		if type(t.code) ~= 'string' then
			return false
		end
		if t.display and type(t.display) ~= 'string' then
			return false
		end
		return true
	end
 
	if templateCfg.introLink and not isValidLinkTable(templateCfg.introLink) then
		return false
	end
	for _, t in ipairs(templateCfg.links) do
		if not isValidLinkTable(t) then
			return false
		end
	end
 
	return true
end
 
local function isValidTemplate(template)
	if type(template) ~= 'string' or template == '' then
		return false
	end
	local templateCfg = maybeLoadData(TEMPLATE_ROOT .. template)
	return isValidTemplateCfg(templateCfg)
end
 
local function isValidLinkAutdocCfg(t)
	if type(t) ~= 'table' then
		return false
	end
	for _, s in ipairs{'description', 'notes'} do
		if t[s] and type(t[s]) ~= 'string' then
			return false
		end
	end
	return true
end
 
local function isValidTemplateAutdocCfg(t)
	if type(t) ~= 'table' then
		return false
	end
	for _, s in ipairs{'description', 'docIntro'} do
		if t[s] and type(t[s]) ~= 'string' then
			return false
		end
	end
	if t.shortcuts and type(t.shortcuts) ~= 'table' then
		return false
	elseif t.shortcuts then
		for _, s in ipairs(t.shortcuts) do
			if type(s) ~= 'string' then
				return false
			end
		end
	end
	return true
end
 
local function makeWikitable(headers, rows)
	local ret = {}
 
	-- Table start
	ret[#ret + 1] = '{| class="wikitable"'
 
	-- Headers
	ret[#ret + 1] = '|-'
	for i, header in ipairs(headers) do
		ret[#ret + 1] = '! ' .. header
	end
 
	-- Rows
	for i, row in ipairs(rows) do
		ret[#ret + 1] = '|-'
		for j, cell in ipairs(row) do
			ret[#ret + 1] = '| ' .. cell
		end
	end
 
	-- Table end
	ret[#ret + 1] = '|}'
 
	return table.concat(ret, '\n')
end
 
local function grey(s)
	return string.format('<span style="color: gray;">%s</span>', s)
end
 
local function bold(s)
	return string.format("'''%s'''", s)
end
 
local function colspan(s, n)
	return string.format('colspan="%d" | %s', n, s)
end
 
local function makeWikitextError(msg)
	return string.format('<strong class="error">%s</strong>', msg)
end
 
local function makeWikilink(page, display)
	if display then
		return string.format('[[%s|%s]]', page, display)
	else
		return string.format('[[%s]]', page)
	end
end
 
function p.linkTable()
	local codes = getFilteredPrefixSubpages(LINK_ROOT)
	local headers = {
		cfg['link-table-code-header'],
		cfg['link-table-description-header'],
		cfg['link-table-example-header'],
		cfg['link-table-config-header'],
		cfg['link-table-notes-header']
	}
	local rows = {}
	for i, code in ipairs(codes) do
		if isValidLink(code) then
			local configPage = LINK_ROOT .. code
			local autodocConfigPage = configPage .. AUTODOC_SUFFIX
			local linkData = maybeLoadData(autodocConfigPage)
			if not isValidLinkAutdocCfg(linkData) then
				linkData = {}
			end
 
			-- Make the example link.
			local success, link = pcall(
				mFindSources._renderLink,
				code,
				{cfg['example-search-term']}
			)
			if not success then
				link = makeWikitextError(link)
			end
 
			-- Build the row.
			local row = {
				bold(code),
				linkData.description or grey("''No description available''"),
				link,
				table.concat({
					makeWikilink(configPage, cfg['link-table-main-config-link-display']),
					makeWikilink(autodocConfigPage, cfg['link-table-autodoc-config-link-display'])
				}, cfg['table-config-separator']),
				linkData.notes or ''
			}
			rows[i] = row
		else
			local msg = substituteParams(
				cfg['invalid-link-config-error'],
				LINK_ROOT .. code
			)
			msg = makeWikitextError(msg)
			msg = colspan(msg, 5)
			rows[i] = {msg}
		end
	end
	return makeWikitable(headers, rows)
end
 
function p.templateTable()
	local templates = getFilteredPrefixSubpages(TEMPLATE_ROOT)
	local headers = {
		cfg['template-table-template-header'],
		cfg['template-table-description-header'],
		cfg['template-table-example-header'],
		cfg['template-table-config-header'],
	}
	local rows = {}
	for i, template in ipairs(templates) do
		if isValidTemplate(template) then
			local configPage = TEMPLATE_ROOT .. template
			local autodocConfigPage = configPage .. AUTODOC_SUFFIX
			local templateData = maybeLoadData(autodocConfigPage)
			if not isValidTemplateAutdocCfg(templateData) then
				templateData = {}
			end
 
			-- Make the example text
			local success, example = pcall(
				mFindSources._main,
				template,
				{cfg['example-search-term']}
			)
			if not success then
				example = makeWikitextError(example)
			end
 
			-- Build the row.
			local row = {
				bold(makeWikilink(mw.site.namespaces[10].name .. ':' .. template, template)),
				templateData.description or grey("''No description available''"),
				example,
				table.concat({
					makeWikilink(configPage, cfg['template-table-main-config-link-display']),
					makeWikilink(autodocConfigPage, cfg['template-table-autodoc-config-link-display'])
				}, cfg['table-config-separator'])
			}
			rows[i] = row
		else
			local msg = substituteParams(
				cfg['invalid-template-config-error'],
				TEMPLATE_ROOT .. template
			)
			msg = makeWikitextError(msg)
			msg = colspan(msg, 4)
			rows[i] = {msg}
		end
	end
	return makeWikitable(headers, rows)
end
 
local function documentation(template)
	-- This function makes documentation for the template specified in
	-- the template parameter. The template should be without the "Template:"
	-- prefix.
 
	-- Load necessary modules
	local mDocumentation = require('Module:Documentation')
	local mList = require('Module:List')
	local frame = mw.getCurrentFrame()
 
	-- Load the config files
	local templateCfg = maybeLoadData(TEMPLATE_ROOT .. template)
	if not isValidTemplateCfg(templateCfg) then
		error(string.format(
			"invalid template name '%s'; no template config found at [[%s]]",
			template,
			TEMPLATE_ROOT .. template
		))
	end
	local autodocCfg = maybeLoadData(TEMPLATE_ROOT .. template .. AUTODOC_SUFFIX)
	if not isValidTemplateAutdocCfg(autodocCfg) then
		autodocCfg = {}
	end
 
	-- Get the documentation content
	local content
	do
		-- Shortcuts
		local shortcuts
		if autodocCfg.shortcuts then
			shortcuts = frame:expandTemplate{title = 'Template shortcut', args = autodocCfg.shortcuts}
		end
 
		-- Link descriptions
		local codes = {}
		if templateCfg.introLink then
			codes[#codes + 1] = templateCfg.introLink.code
		end
		for _, t in ipairs(templateCfg.links) do
			codes[#codes + 1] = t.code
		end
		for i, code in ipairs(codes) do
			local linkAutodocCfg = maybeLoadData(LINK_ROOT .. code .. AUTODOC_SUFFIX)
			if not isValidLinkAutdocCfg(linkAutodocCfg) then
				linkAutodocCfg = {}
			end
			codes[i] = linkAutodocCfg.description or code
		end
		local linkDescriptions = mList.bulleted(codes)
 
		-- Build the content.
		content = frame:expandTemplate{title = 'Find sources documentation', args = {
			template = template,
			shortcuts = shortcuts,
			docIntro = autodocCfg.docIntro,
			isUsedInMainspace = templateCfg.isUsedInMainspace and 'yes' or nil,
			linkDescriptions = linkDescriptions
		}}
	end
 
	return mDocumentation.main{content = content, ['link box'] = cfg['end-box-blurb']}
end
 
setmetatable(p, { __index = function(t, template)
	return function()
		return documentation(template)
	end
end})
 
return p

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