bot.py

import praw
import pdb
import re
import os
import feedparser
import time
import io
import json

# Create a feedparser instance for the Reductress RSS feed
feed = feedparser.parse("http://reductress.com/rss")
entries = feed.entries

# Create the Reddit instance and log in using praw credentials
# located in local praw.ini file
reddit = praw.Reddit('ReductressBot')
subreddit = reddit.subreddit('reductress')

# Retrieve the most recent submission made to r/Reductress by ReductressBot
most_recent = 'none'
for submission in reddit.redditor('ReductressBot').submissions.new(limit=1):
    most_recent = submission.title

queue = []

# Open queue.txt file as json file and load file
with open('queue.txt') as json_file:
    data = json.load(json_file)
    queue = data["queue"]

    # If queue is empty, add everything from the reverse feed to the queue that
    # hasn't already been posted
    if len(queue) == 0:
        caught_up = False
        for entry in reversed(entries):
            if entry.title == most_recent:
                caught_up = True
            else:
                if caught_up:
                    queue.append((entry.title, entry.link))
                else:
                    continue

        # In case the whole RSS feed does not contain our most recently posted article title
        if not caught_up:
            for entry in reversed(entries):
                queue.append((entry.title, entry.link))
    else:
        # Otherwise grab the last item title in the queue
        last = queue[len(queue) - 1][0]
        # loop through reverse feed, don't add entries to the queue until we hit the last item
        caught_up = False
        for entry in reversed(entries):
            if entry.title == last:
                caught_up = True
            else:
                # append the rest of the reverse feed to the queue
                if caught_up:
                    queue.append((entry.title, entry.link))
                else:
                    continue
        # In case the whole RSS feed does not contain our last item
        if not caught_up:
            for entry in reversed(entries):
                queue.append((entry.title, entry.link))

    # post the top entry from queue
    #print("Submitted: " + queue[0][0] + " - " + queue[0][1])
    subreddit.submit(queue[0][0], url=queue[0][1])

    # delete top entry from queue
    queue.pop(0)

# write the queue back to the queue.txt file
with open('queue.txt', 'w') as write_file:
    data = {}
    data["queue"] = queue
    text = json.dumps(data, indent=4)
    write_file.write(text)