recently I started using TypedStruct and also for quite some time I have problem with typos when using structs in elixir, mainly that struct.fiewld_name is not reported during compile time. So I was playing with idea to create plugin for TypedStruct that would generate getter and setter functions for struct. Good thing is, that when I do typo in function name, code don’t compile, another good thing is that it also generate typespecs, so I assume that dialyzer should report when I try to pass wrong type to setter (untested). I used @before_compile and module attributes that TypedStruct is adding to module:
Example:
defmodule Example do
@before_compile TsAccess
use TypedStruct
typedstruct do
field(:name, :string)
end
end
iex> Example.name(%Example{}, "John Doe")
%Example{name: "John Doe"}
iex> Example.name(%Example{name: "John Doe"})
"John Doe"
I’m also thinking to do another library (or as another feature to this one) that would generate lenses
Hello again, I just published version 0.5.0 in which typedstruct is not neceseary anymore and also explicit mode was added where you can define getters explicitly:
defmodule Example do
use TsAccess, explicit: true
defstruct [
:accesible,
:gettable,
:settable
]
defaccessor :accessible
defgetter :gettable
defsetter :settable
end
All macros support also setting of attribute type:
defsetter :name, String.t()
In case of nonexplicit mode without typed struct, types for specs can by set using @types module attribute:
defmodule Example do
use TsAccess
@types [
name: String.t()
]
defstruct [
:name
]
end
Hope someone find this usable :slight_smile:
After some sleep I realized that I don’t need postfix _lens, so now lenses are just field functions without arguments a.k.a get_in(example, [Example.name]) function with postfix _lens are generated with deprecation warning. Also any other ideas how further improve it? I have several:
in implicit mode add exclude, only to using
add prefix, postfix or callback to generate function names
explicit deflens, but this is little bit complicated since I don’t know how to check if field exists
add alias option to defsetter, defgetter and defaccesor
add onli, exclud, onli to defaccessor (in case of explicit lens, to choose what should by generated)
