Get Slack alerts for replies to your Reddit posts

from clickruntime import on_trigger, credentials, http, state, notify

CHANNEL = "#community"
LABEL = {"comment_reply": "Reply to your comment", "post_reply": "Reply on your post", "username_mention": "You were mentioned"}

UA = "clickruntime-automation/1.0"

def reddit(path, **params):
    resp = http.get(f"https://oauth.reddit.com{path}", params=params, headers={
        "Authorization": f"Bearer {credentials.connection('reddit', 'work')}", "User-Agent": UA})
    resp.raise_for_status()
    return resp.json()

@on_trigger
def run(event):
    items = reddit("/message/inbox", limit=50)["data"]["children"]
    last = state.get("last")
    newest = items[0]["data"]["created_utc"] if items else last
    state.set("last", max(newest or 0, last or 0))
    if last is None:
        return {"baseline": True}
    posted = 0
    for child in reversed(items):
        m = child["data"]
        if child["kind"] != "t1" or m["created_utc"] <= last or m.get("type") not in LABEL:
            continue
        notify.slack(f"↩ {LABEL[m['type']]} in r/{m['subreddit']}\nu/{m['author']}: {m['body'][:1500]}\n"
                     f"https://reddit.com{m['context']}", channel=CHANNEL)
        posted += 1
    return {"posted": posted}