Přemysl Eric Janouch
7ce1615021
Colour sequence skipping is somewhat involved, we might want to
add a helper generator to the "degesch" Lua library, in the form of
{substring, is_formatting}.
formatter_parse_mirc() isn't useful, a pure Lua implementation
would be more appropriate (where do we put that?)
69 lines
2.4 KiB
Lua
69 lines
2.4 KiB
Lua
--
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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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local smallest, highlight = 0, "\x1f"
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degesch.setup_config {
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smallest = {
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type = "integer",
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default = "0",
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comment = "smallest number to scan for primality",
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on_change = function (v) smallest = math.max (v, 2) end
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},
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highlight = {
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type = "string",
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default = "\"\\x1f\"",
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comment = "the attribute to use for highlights",
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on_change = function (v) highlight = v end
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},
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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 do_intercolour = function (text)
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return tostring (text:gsub ("%f[%w_]%d+", function (n)
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if tonumber (n) < smallest then return nil end
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for i = 2, n ^ (1 / 2) do if (n % i) == 0 then return nil end end
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return highlight .. n .. highlight
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end))
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end
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local do_interlink = function (text)
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local rebuilt, last = {""}, 1
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for start in text:gmatch ('()\x03') do
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table.insert (rebuilt, do_intercolour (text:sub (last, start - 1)))
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local sub = text:sub (start + 1)
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last = start + (sub:match ('^%d%d?,%d%d?()') or sub:match ('^%d?%d?()'))
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table.insert (rebuilt, text:sub (start, last - 1))
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end
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return table.concat (rebuilt) .. do_intercolour (text:sub (last))
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end
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local do_message = 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_message (message) or line
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end)
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