You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
68 lines
2.4 KiB
68 lines
2.4 KiB
-- |
|
-- prime.lua: highlight prime numbers in messages |
|
-- |
|
-- Copyright (c) 2020, Přemysl Eric Janouch <p@janouch.name> |
|
-- |
|
-- Permission to use, copy, modify, and/or distribute this software for any |
|
-- purpose with or without fee is hereby granted. |
|
-- |
|
-- THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
|
-- WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
|
-- MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY |
|
-- SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
|
-- WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION |
|
-- OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN |
|
-- CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
|
-- |
|
|
|
local smallest, highlight = 0, "\x1f" |
|
xC.setup_config { |
|
smallest = { |
|
type = "integer", |
|
default = "0", |
|
comment = "smallest number to scan for primality", |
|
on_change = function (v) smallest = math.max (v, 2) end |
|
}, |
|
highlight = { |
|
type = "string", |
|
default = "\"\\x1f\"", |
|
comment = "the attribute to use for highlights", |
|
on_change = function (v) highlight = v end |
|
}, |
|
} |
|
|
|
-- The prime test is actually very fast, so there is no DoS concern |
|
local do_intercolour = function (text) |
|
return tostring (text:gsub ("%f[%w_]%d+", function (n) |
|
if tonumber (n) < smallest then return nil end |
|
for i = 2, n ^ (1 / 2) do if (n % i) == 0 then return nil end end |
|
return highlight .. n .. highlight |
|
end)) |
|
end |
|
|
|
local do_interlink = function (text) |
|
local rebuilt, last = {""}, 1 |
|
for start in text:gmatch ('()\x03') do |
|
table.insert (rebuilt, do_intercolour (text:sub (last, start - 1))) |
|
local sub = text:sub (start + 1) |
|
last = start + (sub:match ('^%d%d?,%d%d?()') or sub:match ('^%d?%d?()')) |
|
table.insert (rebuilt, text:sub (start, last - 1)) |
|
end |
|
return table.concat (rebuilt) .. do_intercolour (text:sub (last)) |
|
end |
|
|
|
local do_message = function (text) |
|
local rebuilt, last = {""}, 1 |
|
for run, link, endpos in text:gmatch ('(.-)(%f[%g]https?://%g+)()') do |
|
last = endpos |
|
table.insert (rebuilt, do_interlink (run) .. link) |
|
end |
|
return table.concat (rebuilt) .. do_interlink (text:sub (last)) |
|
end |
|
|
|
-- XXX: sadly it won't typically highlight primes in our own messages, |
|
-- unless IRCv3 echo-message is on |
|
xC.hook_irc (function (hook, server, line) |
|
local start, message = line:match ("^(.- PRIVMSG .- :)(.*)$") |
|
return message and start .. do_message (message) or line |
|
end)
|
|
|