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Trigger everytime a new item post on reddit matches at least one mention Trigger
One script reply has been approved by the moderators Verified

For every new post since last trigger collect the ones that match at least of the mention.

Created by rossmccrann 558 days ago Viewed 485 times
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Submitted by adam186 Deno
Verified 439 days ago
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import {
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  getState,
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  setState,
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} from "https://deno.land/x/windmill@v1.85.0/mod.ts";
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/**
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 * @returns A list of posts that mentioned given phrases in ascending order
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 * of date of publication.
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 *
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 * @param mentions Case **insensitive** phrases that should be searched for.
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 */
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export async function main(
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  subreddit: string,
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  mentions: string[],
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  max_number_of_posts: number = 100,
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) {
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  mentions = mentions?.map((m) => m.trim().toLowerCase())?.filter(Boolean);
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  if (!mentions?.length) {
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    throw Error("\nAt least one mentioned phrase is needed to search for.");
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  }
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  const url = new URL(`https://www.reddit.com/r/${subreddit}/new.json`);
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  if (max_number_of_posts < 1) {
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    max_number_of_posts = 1;
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  }
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  const limit = max_number_of_posts < 100 ? max_number_of_posts : 100;
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  const processedPosts: Post[] = [];
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  let runLoop = true;
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  do {
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    const lastPostId = await getState();
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    url.searchParams.append("limit", limit.toString());
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    lastPostId && url.searchParams.append("before", lastPostId);
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    const result = await fetch(url);
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    if (!result.ok) {
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      throw Error("\n" + (await result.text()));
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    }
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    const data = (await result.json()).data;
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    const posts: Post[] = data.children.map(
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      ({ data: { name, title, selftext, url } }: { data: Post }) => {
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        return { name, title, selftext, url };
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      },
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    );
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    if (!posts.length) {
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      return processedPosts;
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    } else if (posts.length < limit) {
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      runLoop = false;
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    }
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    await setState(posts[0].name);
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    const temp: Post[] = [];
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    for (let i = 0; i < posts.length; i++) {
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      const post = posts[i];
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      const mention =
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        mentions.find((mention) =>
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          post.title.toLowerCase().includes(mention),
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        ) ||
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        mentions.find((mention) =>
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          post.selftext.toLowerCase().includes(mention),
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        );
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      mention && temp.push(post);
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      if (processedPosts.length + temp.length >= max_number_of_posts) {
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        break;
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      }
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    }
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    processedPosts.push(...temp.reverse());
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    if (processedPosts.length >= max_number_of_posts) {
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      runLoop = false;
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    }
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  } while (runLoop);
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  return processedPosts;
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}
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interface Post {
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  name: string;
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  title: string;
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  selftext: string;
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  url: string;
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}
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