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#!/usr/bin/luajit

local re = require 're'
local pat = re.compile([[
	str <- {~ (bug / .)* ~} !.
	num <- { %d+ }
	bug <- (("bgo#" num) -> BGO)
		 / (("bko#" num) -> BKO)
		 / (("bmo#" num) -> BMO)
		 / (("boo#" num) -> BOO)
		 / (("bsc#" num) -> BSC)
		 / (("gh#" { (!"#" .)+ } "#" { %w+ }) -> GH)
		 / (("lp#" num) -> LP)
		 / (("rh#" num) -> RH)
]],{
		BGO = "http://bugzilla.gnome.org/show_bug.cgi?id=%1",
		BKO = "http://bugzilla.kernel.org/show_bug.cgi?id=%1",
		BMO = "http://bugzilla.mozilla.org/show_bug.cgi?id=%1",
		BOO = "http://bugzilla.opensuse.org/show_bug.cgi?id=%1",
		BSC = "http://bugzilla.suse.com/show_bug.cgi?id=%1",
		GH = "https://github.com/%1/issues/%2",
		LP = "https://launchpad.net/bugs/%1",
		RH = "http://bugzilla.redhat.com/show_bug.cgi?id=%1"
});

print(pat:match("gh#python/cpython#123"))
print(pat:match("lp#123456"))
print(pat:match("bramboříček"))