Lua - Reflection - function parameters and docstrings? -

i'm coming lua python. using lua c api. wonder if there standard method bundle parameter , usage information methods , tie standard help() or <method>.__doc__()-like method.

some ideas had:

1) somehow put docs in library metatable , let users use pairs():

static const lual_reg lua_mylib_funcs[] = {     ...     {null, null}}; 

2) print usage info when methods called no parameters.

3) create .help() or .docs() method library.

can point in "lua-ish" direction?

i wonder if there a standard method bundle parameter , usage information methods

nope.

somehow put docs in library metatable , let users use pairs():

you establish convention if method name foo store docs in foo_docs or that.

x.foo_docs = "returns sum of 3 numbers" function x:foo(a,b,c)    return + b + c end 

print usage info when methods called no parameters.

that prevent creating methods no parameters.

can point in "lua-ish" direction?

kinda hard without know why need , how you'd prefer work. <method>.__doc__ convert method (i.e. function) callable table, let index , store metadata want, ugly , require creating new table per method. instance, let convert method callable table:

local documentmethodmetatable = {} function documentmethodmetatable.__call(t,...)   return t.method(...) end function documentmethod(method, doc)   return setmetatable({ method=method, doc=doc}, documentmethodmetatable) end 

then write stuff like:

local foo = {name="donut"} function foo:sum(a,b,c)   print(self.name .. " says sum " .. (a + b + c)) end  foo.sum = documentmethod(foo.sum, "receives 3 arguments , prints sum.")  foo:sum(2,2,3)     --> call sum print(foo.sum.doc) --> index sum docs