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growth.lua
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growth.lua
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--[[
mattata v2.0 - Growth Plugin
Tracks member join/leave events and shows chat growth statistics over time.
Uses Redis daily counters with 48h TTL for automatic cleanup.
]]
local plugin = {}
plugin.name = 'growth'
plugin.category = 'utility'
plugin.description = 'Chat growth statistics over time'
plugin.commands = { 'growth', 'chatgrowth' }
plugin.help = '/growth - Show chat member join/leave statistics for the last 7 days.'
plugin.group_only = true
local tools = require('telegram-bot-lua.tools')
local function format_number(n)
local s = tostring(n)
local pos = #s % 3
if pos == 0 then pos = 3 end
local result = s:sub(1, pos)
for i = pos + 1, #s, 3 do
result = result .. ',' .. s:sub(i, i + 2)
end
return result
end
-- Format a net value with +/- prefix and right-alignment
local function format_net(n, width)
local s
if n > 0 then
s = '+' .. tostring(n)
elseif n < 0 then
s = tostring(n)
else
s = '0'
end
return string.format('%' .. width .. 's', s)
end
function plugin.on_member_join(api, message, ctx)
if not ctx.is_group then return end
local date = os.date('!%Y-%m-%d')
local key = string.format('growth:joins:%s:%s', message.chat.id, date)
local count = ctx.redis.incr(key)
if count == 1 then ctx.redis.expire(key, 691200) end
end
function plugin.on_chat_member_update(api, update, ctx)
if not update.chat then return end
local new_status = update.new_chat_member and update.new_chat_member.status
if new_status == 'left' or new_status == 'kicked' then
local date = os.date('!%Y-%m-%d')
local key = string.format('growth:leaves:%s:%s', update.chat.id, date)
local count = ctx.redis.incr(key)
if count == 1 then ctx.redis.expire(key, 691200) end
end
end
function plugin.on_message(api, message, ctx)
local chat_id = message.chat.id
local days = {}
local total_joins = 0
local total_leaves = 0
-- Collect data for the last 7 days
for i = 0, 6 do
local timestamp = os.time() - (i * 86400)
local date = os.date('!%Y-%m-%d', timestamp)
local join_key = string.format('growth:joins:%s:%s', chat_id, date)
local leave_key = string.format('growth:leaves:%s:%s', chat_id, date)
local joins = tonumber(ctx.redis.get(join_key)) or 0
local leaves = tonumber(ctx.redis.get(leave_key)) or 0
local net = joins - leaves
total_joins = total_joins + joins
total_leaves = total_leaves + leaves
table.insert(days, { date = date, joins = joins, leaves = leaves, net = net })
end
local total_net = total_joins - total_leaves
-- Build output table
local lines = {}
table.insert(lines, 'Chat Growth \xe2\x80\x94 Last 7 Days')
table.insert(lines, '')
table.insert(lines, string.format('%-12s %6s %7s %6s', 'Date', 'Joins', 'Leaves', 'Net'))
table.insert(lines, string.rep('-', 33))
for _, day in ipairs(days) do
table.insert(lines, string.format('%-12s %6d %7d %s',
day.date, day.joins, day.leaves, format_net(day.net, 6)
))
end
table.insert(lines, string.rep('-', 33))
table.insert(lines, string.format('%-12s %6d %7d %s',
'Total:', total_joins, total_leaves, format_net(total_net, 6)
))
-- Get current member count
local member_count_text = ''
local count_result = api.get_chat_member_count(chat_id)
if count_result and count_result.result then
member_count_text = '\n\nCurrent members: ' .. format_number(count_result.result)
end
local output = '<pre>' .. tools.escape_html(
table.concat(lines, '\n')
) .. '</pre>' .. member_count_text
return api.send_message(chat_id, output, { parse_mode = 'html' })
end
return plugin

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