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refactor: use a handler module instead of options map to allow more d…
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,128 +1,25 @@ | ||
| defmodule Crux.Extensions.Command.Consumer do | ||
| # Module being used as consumer for incoming MESSAGE_CREATE | ||
| # events forwarding them to `Crux.Extensions.Command.Handler`. | ||
| @moduledoc false | ||
|
|
||
| alias Crux.Extensions.Command | ||
|
|
||
| @type command_info :: {Command.command_mod(), Command.command_opts()} | ||
| @type command_infos :: [command_info()] | ||
|
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| @doc """ | ||
| Starts a consumer task handling a CREATE_MESSAGE event. | ||
| Will ignore other events. | ||
| """ | ||
| @spec start_link(Command.options(), Crux.Base.Processor.event()) :: {:ok, pid()} | :ignore | ||
| def start_link(opts, {:MESSAGE_CREATE, _, _} = event) do | ||
| Task.start_link(__MODULE__, :handle_event, [opts, event]) | ||
| def start_link(handler, {:MESSAGE_CREATE, _message, _shard_id} = event) do | ||
| Task.start_link(Crux.Extensions.Command.Handler, :handle_event, [event, handler]) | ||
| end | ||
|
|
||
| # Not a MESSAGE_CREATE event, therefore not a command, therefore ignore it | ||
| def start_link(_, _), do: :ignore | ||
| def start_link(_handler, {_type, _message, _shard_id}), do: :ignore | ||
|
|
||
| def child_spec(opts) do | ||
| @doc false | ||
| def child_spec(handler) when is_atom(handler) do | ||
| %{ | ||
| id: __MODULE__, | ||
| start: {__MODULE__, :start_link, [opts]}, | ||
| restart: :transient | ||
| start: {__MODULE__, :start_link, [handler]}, | ||
| restart: :temporary | ||
| } | ||
| end | ||
|
|
||
| @doc """ | ||
| Handles incoming CREATE_MESSAGE events, executing possible commands. | ||
| """ | ||
| def handle_event(opts, {_, %{content: content} = message, shard_id}) do | ||
| case handle_prefix(opts.prefix, content) do | ||
| {:ok, content} -> | ||
| for {command_mod, command} <- match_commands(opts, content, message, shard_id) do | ||
| command = run_command(command_mod, command) | ||
|
|
||
| if command.response && command.response_channel do | ||
| command.rest.create_message!( | ||
| command.response_channel, | ||
| command.response | ||
| ) | ||
| end | ||
| end | ||
|
|
||
| _ -> | ||
| nil | ||
| end | ||
| end | ||
|
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| ### Command (matching) | ||
|
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||
| @doc """ | ||
| Removes the prefix, if not nil, from content and returns an `{:ok, content}` tuple. | ||
| Returns `:error` if prefix did not match. | ||
| """ | ||
| @spec handle_prefix( | ||
| prefix :: String.t() | nil, | ||
| content :: String.t() | ||
| ) :: {:ok, String.t()} | :error | ||
| def handle_prefix(nil, content), do: {:ok, content} | ||
|
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| def handle_prefix(prefix, content) do | ||
| content_down = String.downcase(content) | ||
|
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| if String.starts_with?(content_down, prefix) do | ||
| content = String.slice(content, String.length(prefix)..-1) | ||
|
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| {:ok, content} | ||
| else | ||
| :error | ||
| end | ||
| end | ||
|
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||
| @doc """ | ||
| Gets all commands matching the given content. | ||
| """ | ||
| @spec match_commands( | ||
| opts :: Command.options(), | ||
| content :: String.t(), | ||
| message :: Crux.Structs.Message.t(), | ||
| shard_id :: non_neg_integer() | ||
| ) :: [{Command.command_info(), Command.t()}] | ||
| def match_commands(%{command_infos: command_infos, rest: rest}, content, message, shard_id) do | ||
| [command | args] = String.split(content, ~r{ +}) | ||
|
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| command = String.downcase(command) | ||
|
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| for {command_mod, _} = command_info <- command_infos, | ||
| ^command <- command_mod.triggers() do | ||
| {command_info, | ||
| %Command{ | ||
| trigger: command, | ||
| args: args, | ||
| message: message, | ||
| shard_id: shard_id, | ||
| rest: rest, | ||
| response_channel: message.channel_id | ||
| }} | ||
| end | ||
| end | ||
|
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||
| ### Command (running) | ||
|
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||
| @doc """ | ||
| Executes a command, including all required commands (and their required commands). | ||
| """ | ||
| @spec run_command(Command.command(), Command.t()) :: Command.t() | ||
| def run_command(_command, %Command{halted: true} = command), do: command | ||
|
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| def run_command(command_mod, %Command{} = command) when is_atom(command_mod) do | ||
| run_command({command_mod, []}, command) | ||
| end | ||
|
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| def run_command({command_mod, command_arg}, %Command{} = command) do | ||
| if function_exported?(command_mod, :required, 0) do | ||
| Enum.reduce(command_mod.required(), command, &run_command/2) | ||
| else | ||
| command | ||
| end | ||
| |> case do | ||
| %{halted: true} = command -> | ||
| command | ||
|
|
||
| command -> | ||
| command_mod.call(command, command_arg) | ||
| end | ||
| end | ||
| end |
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