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defmodule LSG.IRC.WikipediaPlugin do
require Logger
@moduledoc """
# wikipédia
* **!wp `<recherche>`**: retourne le premier résultat de la `<recherche>` Wikipedia
* **!wp**: un article Wikipédia au hasard
"""
def irc_doc, do: @moduledoc
def start_link() do
GenServer.start_link(__MODULE__, [])
end
def init(_) do
{:ok, _} = Registry.register(IRC.PubSub, "trigger:wp", [])
{:ok, nil}
end
def handle_info({:irc, :trigger, "wp", message = %IRC.Message{trigger: %IRC.Trigger{args: []}}}, state) do
irc_random(message)
{:noreply, state}
end
def handle_info({:irc, :trigger, "wp", message = %IRC.Message{trigger: %IRC.Trigger{args: args}}}, state) do
irc_search(Enum.join(args, " "), message)
{:noreply, state}
end
def handle_info(info, state) do
{:noreply, state}
end
defp irc_search("", message), do: irc_random(message)
defp irc_search(query, message) do
params = %{
"action" => "query",
"list" => "search",
"srsearch" => String.strip(query),
"srlimit" => 1,
}
case query_wikipedia(params) do
{:ok, %{"query" => %{"search" => [item | _]}}} ->
title = item["title"]
url = "https://fr.wikipedia.org/wiki/" <> String.replace(title, " ", "_")
msg = "Wikipédia: #{title} — #{url}"
message.replyfun.(msg)
_ ->
nil
end
end
defp irc_random(message) do
params = %{
"action" => "query",
"generator" => "random",
"grnnamespace" => 0,
"prop" => "info"
}
case query_wikipedia(params) do
{:ok, %{"query" => %{"pages" => map = %{}}}} ->
[{_, item}] = Map.to_list(map)
title = item["title"]
url = "https://fr.wikipedia.org/wiki/" <> String.replace(title, " ", "_")
msg = "Wikipédia: #{title} — #{url}"
message.replyfun.(msg)
_ ->
nil
end
end
defp query_wikipedia(params) do
url = "https://fr.wikipedia.org/w/api.php"
params = params
|> Map.put("format", "json")
|> Map.put("utf8", "")
case HTTPoison.get(url, [], params: params) do
{:ok, %HTTPoison.Response{status_code: 200, body: body}} -> Jason.decode(body)
{:ok, %HTTPoison.Response{status_code: 400, body: body}} ->
Logger.error "Wikipedia HTTP 400: #{inspect body}"
{:error, "http 400"}
error ->
Logger.error "Wikipedia http error: #{inspect error}"
{:error, "http client error"}
end
end
end
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