poelzi@31: --[[--
jbe@46: return_value =            -- return value of executed chunk
jbe@46: execute.chunk{
poelzi@31:   file_path = file_path,  -- path to a lua source or byte-code file
poelzi@31:   app       = app,        -- app name to use or the current will be used
poelzi@31:   module    = module,     -- module where chunk is located
jbe@46:   chunk     = chunk       -- name of chunk (filename without .lua extension)
poelzi@32:   id        = id,         -- id to be returned by param.get_id(...) during execution
poelzi@32:   params    = params      -- parameters to be returned by param.get(...) during execution
poelzi@31: }
poelzi@31: 
jbe@205: This function loads and executes a lua file specified by a given path or constructs a path to load from the module and chunk name. A chunk name should always begin with an underscore. All return values of the loaded and executed chunk are returned by this function as well.
poelzi@31: 
poelzi@31: --]]--
poelzi@31: 
jbe@205: local function pack_return_values(...)
jbe@205:   local storage = {...}
jbe@205:   storage.n = select("#", ...)
jbe@205: end
jbe@205: 
jbe@205: local function unpack_return_values(storage)
jbe@205:   return table.unpack(storage, 1, storage.n)
jbe@205: end
jbe@205: 
jbe@46: function execute.chunk(args)
poelzi@31:   local file_path = args.file_path
poelzi@31:   local app       = args.app
poelzi@31:   local module    = args.module
poelzi@31:   local chunk     = args.chunk
poelzi@32:   local id        = args.id
poelzi@32:   local params    = args.params
poelzi@31: 
poelzi@31:   app = app or request.get_app_name()
poelzi@31: 
jbe@46:   file_path = file_path or encode.file_path(
jbe@46:     request.get_app_basepath(),
jbe@46:     'app', app, module, chunk .. '.lua'
jbe@46:   )
poelzi@32: 
poelzi@31:   local func, load_errmsg = loadfile(file_path)
poelzi@31:   if not func then
poelzi@31:     error('Could not load file "' .. file_path .. '": ' .. load_errmsg)
poelzi@31:   end
poelzi@32: 
poelzi@32:   if id or params then
poelzi@32:     param.exchange(id, params)
poelzi@32:   end
poelzi@32: 
jbe@205:   local result = pack_return_values(func())
poelzi@32: 
poelzi@32:   if id or params then
poelzi@32:     param.restore()
poelzi@32:   end
poelzi@32: 
jbe@205:   return unpack_return_values(result)
poelzi@31: end