Hi, I am writing a simple IRC bot, pretty much just for fun, starting with a
simple implementation originally posted by Nurullah Akkaya on his blog. It
already does what it's supposed to, which is message a fortune from mod-fortune
(shelling out) when someone asks it to.
However, there's a bit of code I don't like. It looks like this:
(cond
(re-find #"^:(.*?)!.*PRIVMSG (.*) :(.*)" msg)
(let [[_ from to message] (re-find #"^:(.*?)!.*PRIVMSG (.*) :(.*)"
msg)]
[...logic omitted...]
What's happening is we're looking for a PRIVMSG, and if we find one, we scan
the message again and pull out the chunks we're interested in, and use them in
the "logic" part below.
The problem is I don't like maintaining two regular expressions. I wish I
could use it only once, and therefore change it only once if it needs to be
modified. I'd prefer to see an expression that looks like this (for example):
(cond
(if-matched #"^:(.*?)!.*PRIVMSG (.*) :(.*)" msg
[from to message]
(true form)
(optional false form)))
The if-matched acts as a let block while pulling out groups and assigning to
local variables at the same time. Also, it ignores the first "match" of
re-find, which is the entire expression -- not generally useful to me. Maybe
if-matched-groups would ignore the overall expression, and if-matched would
include it.
I suppose a macro might be the way to go to accomplish this, but I wonder if
there are any Clojure tricks that could accomplish this short of a macro.
Also, do any fellow Clojurians think a macro like this is a bad idea in
general? Would you suggest taking a different tack to solve this problem?
Thanks in advance!
steven
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