Module:Unsubst

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

local p = {}

local specialParams = {
  ['$N'] = 'template name', -- Deprecated, but keeping until it is removed from transcluding templates
  ['$B'] = 'template content',
}

p[''] = function ( frame )
  if not frame:getParent() then
    error( '{{#invoke:Unsubst|}} makes no sense without a parent frame' )
  end
  if not frame.args['$B'] then
    error( '{{#invoke:Unsubst|}} requires parameter $B (template content)' )
  end
  
  if mw.isSubsting() then
    ---- substing
    -- Combine passed args with passed defaults
    local args = {}
    for k, v in pairs( frame.args ) do
      if not specialParams[k] then
        if v == '__DATE__' then
          v = mw.getContentLanguage():formatDate( 'F Y' )
        end
        args[k] = v
      end
    end
    for k, v in pairs( frame:getParent().args ) do
      args[k] = v
    end

    -- Build an equivalent template invocation
    -- First, find the title to use
    local titleobj = mw.title.new(frame:getParent():getTitle())
    local title
    if titleobj.namespace == 10 then -- NS_TEMPLATE
      title = titleobj.text
    elseif titleobj.namespace == 0 then -- NS_MAIN
      title = ':' .. titleobj.text
    else
      title = titleobj.prefixedText
    end

    -- Build the invocation body with numbered args first, then named
    local ret = '{{' .. title
    for k, v in ipairs( args ) do
      if string.find( v, '=', 1, true ) then
        -- likely something like 1=foo=bar, we need to do it as a named arg
        break
      end
      ret = ret .. '|' .. v
      args[k] = nil
    end
    for k, v in pairs( args ) do
      ret = ret .. '|' .. k .. '=' .. v
    end
    
    return ret .. '}}'
  else
    ---- Not substing
    -- Just return the "body"
    return frame.args['$B'] .. (frame.args['$N'] and frame:getParent():getTitle() == mw.title.getCurrentTitle().prefixedText and '[[Category:Calls to Module:Unsubst that use $N]]' or '')
  end
end

return p