degesch: add a plugin to highlight prime numbers
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plugins/degesch/prime.lua
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50
plugins/degesch/prime.lua
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--
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-- prime.lua: highlight prime numbers in messages
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--
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-- Copyright (c) 2020, Přemysl Eric Janouch <p@janouch.name>
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--
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-- Permission to use, copy, modify, and/or distribute this software for any
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-- purpose with or without fee is hereby granted.
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--
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-- THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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-- WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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-- MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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-- SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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-- WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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-- OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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-- CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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--
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-- The prime test is actually very fast, so there is no DoS concern
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local is_prime = function (n)
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if tonumber (n) < 2 then return false end
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for i = 2, n ^ (1 / 2) do if (n % i) == 0 then return false end end
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return true
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end
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local do_interlink = function (run)
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-- Let's not cripple formatting, colours especially
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-- TODO: we can just employ the same approach as in do_text and skip over
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if run:find ('%c') then return run end
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return run:gsub ("%f[%w_]%d+%f[^%w_]", function (number)
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if is_prime (number) then return "\x1f" .. number .. "\x1f" end
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return number
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end)
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end
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local do_text = function (text)
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local rebuilt, last = {""}, 1
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for run, link, endpos in text:gmatch ('(.-)(%f[%g]https?://%g+)()') do
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last = endpos
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table.insert (rebuilt, do_interlink (run) .. link)
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end
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return table.concat (rebuilt, "") .. do_interlink (text:sub (last))
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end
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-- XXX: sadly it won't typically highlight primes in our own messages,
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-- unless IRCv3 echo-message is on
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degesch.hook_irc (function (hook, server, line)
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local start, message = line:match ("^(.- PRIVMSG .- :)(.*)$")
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return message and start .. do_text (message) or line
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end)
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