1 files changed, 160 insertions, 0 deletions
diff --git a/plugins/zyklonb/seen b/plugins/zyklonb/seen
new file mode 100755
index 0000000..3f49ea8
--- /dev/null
+++ b/plugins/zyklonb/seen
@@ -0,0 +1,160 @@
+#!/usr/bin/env lua
+--
+-- ZyklonB seen plugin
+--
+-- Copyright 2016 Přemysl Janouch <p.janouch@gmail.com>
+-- See the file LICENSE for licensing information.
+--
+
+function parse (line)
+	local msg = { params = {} }
+	line = line:match ("[^\r]*")
+	for start, word in line:gmatch ("()([^ ]+)") do
+		local colon = word:match ("^:(.*)")
+		if start == 1 and colon then
+			msg.prefix = colon
+		elseif not msg.command then
+			msg.command = word
+		elseif colon then
+			table.insert (msg.params, line:sub (start + 1))
+			break
+		elseif start ~= #line then
+			table.insert (msg.params, word)
+		end
+	end
+	return msg
+end
+
+function get_config (name)
+	io.write ("ZYKLONB get_config :", name, "\r\n")
+	return parse (io.read ()).params[1]
+end
+
+-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+io.output ():setvbuf ('line')
+local prefix = get_config ('prefix')
+io.write ("ZYKLONB register\r\n")
+
+local db = {}
+local db_filename = "seen.db"
+local db_garbage = 0
+
+function remember (who, where, when, what)
+	if not db[who] then db[who] = {} end
+	if db[who][where] then db_garbage = db_garbage + 1 end
+	db[who][where] = { tonumber (when), what }
+end
+
+-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+local db_file, e = io.open (db_filename, "a+")
+if not db_file then error ("cannot open database: " .. e, 0) end
+
+function db_store (who, where, when, what)
+	db_file:write (string.format
+		(":%s %s %s %s :%s\n", who, "PRIVMSG", where, when, what))
+end
+
+function db_compact ()
+	db_file:close ()
+
+	-- Unfortunately, default Lua doesn't have anything like mkstemp()
+	local db_tmpname = db_filename .. "." .. os.time ()
+	db_file, e = io.open (db_tmpname, "a+")
+	if not db_file then error ("cannot save database: " .. e, 0) end
+
+	for who, places in pairs (db) do
+		for where, data in pairs (places) do
+			db_store (who, where, data[1], data[2])
+		end
+	end
+	db_file:flush ()
+
+	local ok, e = os.rename (db_tmpname, db_filename)
+	if not ok then error ("cannot save database: " .. e, 0) end
+	db_garbage = 0
+end
+
+for line in db_file:lines () do
+	local msg = parse (line)
+	remember (msg.prefix, table.unpack (msg.params))
+end
+
+-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+function seen (who, where, args)
+	local respond = function (...)
+		local privmsg = function (target, ...)
+			io.write ("PRIVMSG ", target, " :", table.concat { ... }, "\r\n")
+		end
+		if where:match ("^[#&!+]") then
+			privmsg (where, who, ": ", ...)
+		else
+			privmsg (who, ...)
+		end
+	end
+
+	local whom, e, garbage = args:match ("^(%S+)()%s*(.*)")
+	if not whom or #garbage ~= 0 then
+		return respond ("usage: <name>")
+	elseif who:lower () == whom:lower () then
+		return respond ("I can see you right now.")
+	end
+
+	local top = {}
+	-- That is, * acts like a wildcard, otherwise everything is escaped
+	local pattern = "^" .. whom:gsub ("[%^%$%(%)%%%.%[%]%+%-%?]", "%%%0")
+		:gsub ("%*", ".*"):lower () .. "$"
+	for name, places in pairs (db) do
+		if places[where] and name:lower ():match (pattern) then
+			local when, what = table.unpack (places[where])
+			table.insert (top, { name = name, when = when, what = what })
+		end
+	end
+	if #top == 0 then
+		return respond ("I have not seen \x02" .. whom .. "\x02 here.")
+	end
+
+	-- Get all matching nicknames ordered from the most recently active
+	-- and make the list case insensitive (remove older duplicates)
+	table.sort (top, function (a, b) return a.when > b.when end)
+	for i = #top, 2, -1 do
+		if top[i - 1].name:lower () == top[i].name:lower () then
+			table.remove (top, i)
+		end
+	end
+
+	-- Hopefully the formatting mess will disrupt highlights in clients
+	for i = 1, math.min (#top, 3) do
+		local name = top[i].name:gsub ("^.", "%0\x02\x02")
+		respond (string.format ("\x02%s\x02 -> %s -> %s",
+			name, os.date ("%c", top[i].when), top[i].what))
+	end
+end
+
+function handle (msg)
+	local who = msg.prefix:match ("^[^!@]*")
+	local where, what = table.unpack (msg.params)
+	local when = os.time ()
+
+	local what_log = what:gsub ("^\x01ACTION", "*"):gsub ("\x01$", "")
+	remember (who, where, when, what_log)
+	db_store (who, where, when, what_log)
+
+	-- Comment out to reduce both disk load and reliability
+	db_file:flush ()
+
+	if db_garbage > 5000 then db_compact () end
+
+	if what:sub (1, #prefix) == prefix then
+		local command = what:sub (#prefix + 1)
+		local name, e = command:match ("^(%S+)%s*()")
+		if name == 'seen' then seen (who, where, command:sub (e)) end
+	end
+end
+
+for line in io.lines () do
+	local msg = parse (line)
+	if msg.command == "PRIVMSG" then handle (msg) end
+end