#!/usr/bin/lua

local lpeg = require 'lpeg'
local P,C,Cs,Cf,R = lpeg.P, lpeg.C, lpeg.Cs, lpeg.Cf, lpeg.R

local tokens = {
    NONHASH    = C((1 - P("#"))^1),             -- any nonempty string not containing #
    NUM        = C(R("09")^1),                  -- nonempty digit string
    WORD       = C(R("AZ","az","09","__")^1)    -- nonempty word
}
local patterns = {
    ["bgo#%NUM"] = "http://bugzilla.gnome.org/show_bug.cgi?id=%1",
    ["bko#%NUM"] = "http://bugzilla.kernel.org/show_bug.cgi?id=%1",
    ["bmo#%NUM"] = "http://bugzilla.mozilla.org/show_bug.cgi?id=%1",
    ["boo#%NUM"] = "http://bugzilla.opensuse.org/show_bug.cgi?id=%1",
    ["bsc#%NUM"] = "http://bugzilla.suse.com/show_bug.cgi?id=%1",
    ["gh#%NONHASH#%WORD"] = "https://github.com/%1/issues/%2",
    ["lp#%NUM"] = "https://launchpad.net/bugs/%1",
    ["rh#%NUM"] = "http://bugzilla.redhat.com/show_bug.cgi?id=%1",
}

-- turn "foo#%BLAH" into a pattern that matches everything literally except
-- %BLAH
local makepat = Cf(
    (
        ((P("%") * C(R("AZ")^1)) / tokens)        -- %BLAH is from tokens
        + (P"%%" / function() return P"%" end)    -- %% treat as literal %
        + (C(P(1)) / P)                           -- anything else is literal
    )^0,
    function(a,b) return a * b end)
local function make_pattern(str)
    return assert(makepat:match(str), "invalid pattern")
end

local bugpat = P(false)
for k,v in pairs(patterns) do
    bugpat = bugpat + (make_pattern(k) / v)
end
local pat = Cs((bugpat + P(1))^0)

os.execute("xdg-open " .. pat:match(arg[1]))