fix: compilation under elixir 1.6 by hiding since docs behind macro

lib/structs.ex

@@ -1,10 +1,12 @@
 defmodule Crux.Structs do
-  @moduledoc since: "0.1.0"
   @moduledoc """
     Provides a unified function to create one or a list of structs, invoking their `create/1` function if available.
   """
 
   alias Crux.Structs.Util
+  require Util
+
+  Util.modulesince("0.1.0")
 
   @doc """
     Can be implemented by structs to transform the inital data.
@@ -69,7 +71,7 @@ defmodule Crux.Structs do
   """
   @spec create(data :: map(), target :: module()) :: struct()
   @spec create(data :: list(), target :: module()) :: list(struct())
-  @doc since: "0.1.0"
+  Util.since("0.1.0")
   def create(data, target)
   def create(nil, _target), do: nil
 
@@ -80,7 +82,7 @@ defmodule Crux.Structs do
   def create(%{__struct__: target} = data, target), do: data
 
   def create(data, target) do
-    if Keyword.has_key?(target.__info__(:functions), :create) do
+    if :erlang.function_exported(target, :create, 1) do
       target.create(data)
     else
       data = Util.atomify(data)

lib/structs/attachment.ex

@@ -1,5 +1,4 @@
 defmodule Crux.Structs.Attachment do
-  @moduledoc since: "0.1.0"
   @moduledoc """
     Represents a Discord [Attachment Object](https://discordapp.com/developers/docs/resources/channel#attachment-object-attachment-structure)
 
@@ -9,6 +8,9 @@ defmodule Crux.Structs.Attachment do
   @behaviour Crux.Structs
 
   alias Crux.Structs.Util
+  require Util
+
+  Util.modulesince("0.1.0")
 
   defstruct(
     id: nil,
@@ -20,7 +22,8 @@ defmodule Crux.Structs.Attachment do
     width: nil
   )
 
-  @typedoc since: "0.1.0"
+  Util.typesince("0.1.0")
+
   @type t :: %__MODULE__{
           id: Crux.Rest.snowflake(),
           filename: String.t(),
@@ -36,6 +39,8 @@ defmodule Crux.Structs.Attachment do
 
   > Automatically invoked by `Crux.Structs.create/2`.
   """
+  Util.since("0.1.0")
+
   def create(data) do
     data =
       data

lib/structs/audit_log.ex

@@ -1,20 +1,23 @@
 defmodule Crux.Structs.AuditLog do
-  @moduledoc since: "0.1.6"
   @moduledoc """
     Represents a Discord [Audit Log Object](https://discordapp.com/developers/docs/resources/audit-log#audit-log-object)
   """
 
   @behaviour Crux.Structs
 
   alias Crux.Structs.{AuditLogEntry, User, Util, Webhook}
+  require Util
+
+  Util.modulesince("0.1.6")
 
   defstruct(
     webhooks: %{},
     users: %{},
     audit_log_entries: %{}
   )
 
-  @typedoc since: "0.1.6"
+  Util.typesince("0.1.6")
+
   @type t :: %__MODULE__{
           webhooks: %{Crux.Rest.snowflake() => Webhook.t()},
           users: %{Crux.Rest.snowflake() => User.t()},
@@ -26,7 +29,8 @@ defmodule Crux.Structs.AuditLog do
 
   > Automatically invoked by `Crux.Structs.create/2`.
   """
-  @doc since: "0.1.6"
+  Util.since("0.1.6")
+
   def create(data) do
     data =
       data

lib/structs/audit_log_change.ex

@@ -1,5 +1,4 @@
 defmodule Crux.Structs.AuditLogChange do
-  @moduledoc since: "0.1.6"
   @moduledoc """
     Represents a Discord [Audit Log Change Object](https://discordapp.com/developers/docs/resources/audit-log#audit-log-change)
   """
@@ -8,6 +7,9 @@ defmodule Crux.Structs.AuditLogChange do
 
   alias Crux.Structs
   alias Crux.Structs.{Overwrite, Role, Util}
+  require Util
+
+  Util.modulesince("0.1.6")
 
   defstruct(
     new_value: nil,
@@ -20,7 +22,8 @@ defmodule Crux.Structs.AuditLogChange do
 
   > Note that the Role object returned by Discord in audit logs is a partial role that only contains id and name.
   """
-  @typedoc since: "0.1.6"
+  Util.typesince("0.1.6")
+
   @type audit_log_change_value ::
           String.t()
           | Crux.Rest.snowflake()
@@ -29,7 +32,8 @@ defmodule Crux.Structs.AuditLogChange do
           | [Role.t()]
           | [Overwrite.t()]
 
-  @typedoc since: "0.1.6"
+  Util.typesince("0.1.6")
+
   @type t :: %__MODULE__{
           new_value: audit_log_change_value() | nil,
           old_value: audit_log_change_value() | nil,
@@ -41,7 +45,8 @@ defmodule Crux.Structs.AuditLogChange do
 
   > Automatically invoked by `Crux.Structs.create/2`.
   """
-  @doc since: "0.1.6"
+  Util.since("0.1.6")
+
   def create(data) do
     data =
       data

lib/structs/audit_log_entry.ex

@@ -1,12 +1,14 @@
 defmodule Crux.Structs.AuditLogEntry do
-  @moduledoc since: "0.1.6"
   @moduledoc """
     Represents a Discord [Audit Log Object](https://discordapp.com/developers/docs/resources/audit-log)
   """
 
   @behaviour Crux.Structs
 
   alias Crux.Structs.{AuditLogChange, Util}
+  require Util
+
+  Util.modulesince("0.1.6")
 
   @audit_log_events %{
     guild_update: 1,
@@ -40,7 +42,8 @@ defmodule Crux.Structs.AuditLogEntry do
   @typedoc """
     Union type of audit log event name atoms.
   """
-  @typedoc since: "0.1.6"
+  Util.typesince("0.1.6")
+
   @type event_name ::
           :guild_update
           | :channel_create
@@ -75,14 +78,14 @@ defmodule Crux.Structs.AuditLogEntry do
     Returns a map of all audit log event names with their id
   """
   @spec events() :: %{event_name => non_neg_integer()}
-  @doc since: "0.1.6"
+  Util.since("0.1.6")
   def events, do: @audit_log_events
 
   @doc """
     Gets the event name from the action type id
   """
   @spec event_name(action_type :: non_neg_integer()) :: atom()
-  @doc since: "0.1.6"
+  Util.since("0.1.6")
   def event_name(action_type), do: Map.get(@audit_log_events_key, action_type)
 
   defstruct(
@@ -95,7 +98,8 @@ defmodule Crux.Structs.AuditLogEntry do
     reason: nil
   )
 
-  @typedoc since: "0.1.6"
+  Util.typesince("0.1.6")
+
   @type t :: %__MODULE__{
           id: Crux.Rest.snowflake(),
           target_id: Crux.Rest.snowflake(),
@@ -111,7 +115,8 @@ defmodule Crux.Structs.AuditLogEntry do
 
   > Automatically invoked by `Crux.Structs.create/2`.
   """
-  @doc since: "0.1.6"
+  Util.since("0.1.6")
+
   def create(data) do
     data =
       data

lib/structs/channel.ex

@@ -1,5 +1,4 @@
 defmodule Crux.Structs.Channel do
-  @moduledoc since: "0.1.0"
   @moduledoc """
   Represents a Discord [Channel Object](https://discordapp.com/developers/docs/resources/channel#channel-object-channel-structure).
 
@@ -33,6 +32,9 @@ defmodule Crux.Structs.Channel do
   @behaviour Crux.Structs
 
   alias Crux.Structs.{Overwrite, Util}
+  require Util
+
+  Util.modulesince("0.1.0")
 
   defstruct(
     application_id: nil,
@@ -55,7 +57,8 @@ defmodule Crux.Structs.Channel do
     user_limit: nil
   )
 
-  @typedoc since: "0.1.0"
+  Util.typesince("0.1.0")
+
   @type t :: %__MODULE__{
           application_id: Crux.Rest.snowflake(),
           bitrate: integer(),
@@ -82,7 +85,8 @@ defmodule Crux.Structs.Channel do
 
   > Automatically invoked by `Crux.Structs.create/2`
   """
-  @doc since: "0.1.0"
+  Util.since("0.1.0")
+
   def create(data) do
     data =
       data
@@ -116,7 +120,7 @@ defmodule Crux.Structs.Channel do
   ```
   """
   @spec to_mention(user :: Crux.Structs.Channel.t()) :: String.t()
-  @doc since: "0.1.1"
+  Util.since("0.1.1")
   def to_mention(%__MODULE__{id: id}), do: "<##{id}>"
 
   defimpl String.Chars, for: Crux.Structs.Channel do

lib/structs/embed.ex

@@ -1,5 +1,4 @@
 defmodule Crux.Structs.Embed do
-  @moduledoc since: "0.1.0"
   @moduledoc """
   Represents a Discord [Embed Object](https://discordapp.com/developers/docs/resources/channel#embed-object-embed-structure).
 
@@ -8,6 +7,11 @@ defmodule Crux.Structs.Embed do
 
   @behaviour Crux.Structs
 
+  alias Crux.Structs.Util
+  require Util
+
+  Util.modulesince("0.1.0")
+
   defstruct(
     title: nil,
     type: "rich",
@@ -24,7 +28,8 @@ defmodule Crux.Structs.Embed do
     fields: []
   )
 
-  @typedoc since: "0.1.0"
+  Util.typesince("0.1.0")
+
   @type t :: %__MODULE__{
           title: String.t() | nil,
           type: String.t() | nil,

lib/structs/emoji.ex

@@ -1,5 +1,4 @@
 defmodule Crux.Structs.Emoji do
-  @moduledoc since: "0.1.0"
   @moduledoc """
   Represents a Discord [Emoji Object](https://discordapp.com/developers/docs/resources/emoji#emoji-object-emoji-structure).
 
@@ -10,6 +9,9 @@ defmodule Crux.Structs.Emoji do
   @behaviour Crux.Structs
 
   alias Crux.Structs.Util
+  require Util
+
+  Util.modulesince("0.1.0")
 
   defstruct(
     animated: nil,
@@ -21,7 +23,8 @@ defmodule Crux.Structs.Emoji do
     managed: nil
   )
 
-  @typedoc since: "0.1.0"
+  Util.typesince("0.1.0")
+
   @type t :: %__MODULE__{
           animated: boolean() | nil,
           id: Crux.Rest.snowflake() | nil,
@@ -37,7 +40,8 @@ defmodule Crux.Structs.Emoji do
 
   > Automatically invoked by `Crux.Structs.create/2`.
   """
-  @doc since: "0.1.0"
+  Util.since("0.1.0")
+
   def create(data) do
     data =
       data
@@ -93,7 +97,7 @@ defmodule Crux.Structs.Emoji do
   """
   @spec to_identifier(emoji :: Crux.Structs.Emoji.t() | Crux.Structs.Reaction.t() | String.t()) ::
           String.t()
-  @doc since: "0.1.1"
+  Util.since("0.1.1")
   def to_identifier(%Crux.Structs.Reaction{emoji: emoji}), do: to_identifier(emoji)
   def to_identifier(%__MODULE__{id: nil, name: name}), do: name |> URI.encode_www_form()
   def to_identifier(%__MODULE__{id: id, name: name, animated: true}), do: "a:#{name}:#{id}"

lib/structs/guild.ex

@@ -1,5 +1,4 @@
 defmodule Crux.Structs.Guild do
-  @moduledoc since: "0.1.0"
   @moduledoc """
   Represents a Discord [Guild Object](https://discordapp.com/developers/docs/resources/guild#guild-object-guild-structure).
 
@@ -12,6 +11,9 @@ defmodule Crux.Structs.Guild do
   @behaviour Crux.Structs
 
   alias Crux.Structs.{Member, Role, Util, VoiceState}
+  require Util
+
+  Util.modulesince("0.1.0")
 
   defstruct(
     id: nil,
@@ -42,7 +44,8 @@ defmodule Crux.Structs.Guild do
     # presences: %{}
   )
 
-  @typedoc since: "0.1.0"
+  Util.typesince("0.1.0")
+
   @type t :: %__MODULE__{
           id: Crux.Rest.snowflake(),
           name: String.t(),
@@ -77,7 +80,8 @@ defmodule Crux.Structs.Guild do
   > Automatically invoked by `Crux.Structs.create/2`.
   """
   # TODO: Write a test
-  @doc since: "0.1.0"
+  Util.since("0.1.0")
+
   def create(data) do
     data =
       data