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remind.lua
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remind.lua
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--[[
Based on a plugin by topkecleon. Licensed under GNU AGPLv3
https://github.com/topkecleon/otouto/blob/master/LICENSE.
Copyright 2020 Matthew Hesketh <matthew@matthewhesketh.com>
This code is licensed under the MIT. See LICENSE for details.
]]
local remind = {}
local mattata = require('mattata')
local json = require('dkjson')
local redis = require('libs.redis')
function remind:init()
remind.commands = mattata.commands(self.info.username)
:command('remind')
:command('reminders').table
remind.help = '/remind <duration> <message> - Repeats a message after a duration of time, in the format 2d3h. The maximum number of reminders at one time is 4 per chat, and each reminder must be between 1 hour and 182 days in duration. Reminders cannot be any more than 256 characters in length. Use /reminders to view your current reminders. An example use of this command would be: /remind 21d3h test, which would remind you in 21 days and 3 hours.'
end
function remind.get_reminders(message)
local reminders = {}
if redis:get('reminders') then
reminders = json.decode(
redis:get('reminders')
)
end
local this_chat = {}
local count = 0
for k, v in pairs(reminders) do
if v.chat and v.chat.id == message.chat.id then
local real_expiry = tonumber(v.expires) / 3600
table.insert(
this_chat,
string.format(
utf8.char(8226) .. ' %s <code>[Added by %s, expires in approx. %s hour%s]</code>',
mattata.escape_html(v.reminder),
mattata.escape_html(v.name),
mattata.round(
(
tonumber(v.expires) - os.time()
) / 3600,
2
),
mattata.round(
(
tonumber(v.expires) - os.time()
) / 3600,
2
) == 1 and '' or 's'
)
)
count = count + 1
end
end
if count == 0 then
return mattata.send_reply(
message,
'You don\'t have any reminders set up in this chat!'
)
end
return mattata.send_reply(
message,
string.format(
'You currently have %s reminder%s set up for %s:\n%s',
count,
count == 1 and '' or 's',
mattata.escape_html(message.chat.title),
table.concat(
this_chat,
'\n'
)
),
'html'
)
end
function remind:on_message(message)
if message.text:match('^[%/%!%$%^%?%&%%]reminders') then
return remind.get_reminders(message)
end
local input = mattata.input(message.text)
if not input or not input:match('^.- .-$') then
return mattata.send_reply(
message,
remind.help
)
end
local duration, reminder = input:match('^(.-) (.-)$')
-- Convert each unit of time into seconds.
local weeks = 0
if duration:match('%d[Ww]') then
weeks = tonumber(
duration:match('(%d*)[Ww]')
) * 604800
end
local days = 0
if duration:match('%d[Dd]') then
days = tonumber(
duration:match('(%d*)[Dd]')
) * 86400
end
local hours = 0
if duration:match('%d[Hh]') then
hours = tonumber(
duration:match('(%d*)[Hh]')
) * 3600
end
duration = days + hours
if duration <= 0 then
return mattata.send_reply(
message,
'The duration you specified isn\'t in a valid format. The duration of your reminder must be between 1 hour and 6 months, and in the format 5m1w12d3h, which would remind you in 5 months, 1 week, 12 days and 3 hours.'
)
elseif duration > 15724800 or duration < 1 then
return mattata.send_reply(
message,
'The duration of your reminder must be between 1 hour and 182 days.'
)
end
if utf8.len(reminder) > 256 then
return mattata.send_reply(
message,
'Your reminder must not be any longer than 256 characters.'
)
end
local reminders = {}
if redis:get('reminders') then
reminders = json.decode(
redis:get('reminders')
)
end
local count = 0
for k, v in pairs(reminders) do
if v.chat and v.chat.id == message.chat.id then
count = count + 1
end
end
if count >= 4 then
return mattata.send_reply(
message,
'You already have 4 reminders set up in this chat. Please wait for one to expire before you add any more!'
)
end
table.insert(
reminders,
{
['reminder'] = reminder,
['expires'] = os.time() + duration,
['chat'] = {
['id'] = message.chat.id,
['title'] = message.chat.title
},
['name'] = message.from.name or message.chat.title
}
)
redis:set(
'reminders',
json.encode(reminders)
)
duration = duration / 3600 -- Convert back to hours.
return mattata.send_reply(
message,
string.format(
'I will remind you in %s hour%s!',
mattata.round(duration),
tonumber(duration) == 1 and '' or 's'
)
)
end
function remind:cron()
local current_time = os.time()
local reminders = redis:get('reminders')
if not reminders then
return
end
reminders = json.decode(reminders)
for k, v in pairs(reminders) do
if current_time > v.expires then
mattata.send_message(
v.chat.id,
'Reminder: ' .. v.reminder
)
table.remove(
reminders,
k
)
end
end
redis:set(
'reminders',
json.encode(reminders)
)
return
end
return remind

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