Add new multi-use !info command

backend/src/utils/resolveMessageTarget.ts

@@ -0,0 +1,58 @@
+import { disableInlineCode, isSnowflake } from "../utils";
+import { getChannelIdFromMessageId } from "../data/getChannelIdFromMessageId";
+import { PluginData, TypeConversionError } from "knub";
+import { TextChannel } from "eris";
+
+const channelAndMessageIdRegex = /^(\d+)[\-\/](\d+)$/;
+const messageLinkRegex = /^https:\/\/(?:\w+\.)?discord(?:app)?\.com\/channels\/\d+\/(\d+)\/(\d+)$/i;
+
+export interface MessageTarget {
+  channel: TextChannel;
+  messageId: string;
+}
+
+export async function resolveMessageTarget(pluginData: PluginData<any>, value: string) {
+  const result = await (async () => {
+    if (isSnowflake(value)) {
+      const channelId = await getChannelIdFromMessageId(value);
+      if (!channelId) {
+        return null;
+      }
+
+      return {
+        channelId,
+        messageId: value,
+      };
+    }
+
+    const channelAndMessageIdMatch = value.match(channelAndMessageIdRegex);
+    if (channelAndMessageIdMatch) {
+      return {
+        channelId: channelAndMessageIdMatch[1],
+        messageId: channelAndMessageIdMatch[2],
+      };
+    }
+
+    const messageLinkMatch = value.match(messageLinkRegex);
+    if (messageLinkMatch) {
+      return {
+        channelId: messageLinkMatch[1],
+        messageId: messageLinkMatch[2],
+      };
+    }
+  })();
+
+  if (!result) {
+    return null;
+  }
+
+  const channel = pluginData.guild.channels.get(result.channelId);
+  if (!channel || !(channel instanceof TextChannel)) {
+    return null;
+  }
+
+  return {
+    channel,
+    messageId: result.messageId,
+  };
+}