Operator Replacer

-- a simple fix for the fact that lua doesn't have the operator= operators
-- works for +=, -=, /=, *=, and %=

local args = {...}
local file = io.open(args[1], "r")
local file2 = fs.open(args[1]..".withOperators", "w")

local function concentate(...)
    local fnArgs = {...}
    local ret = ""
    for i, v in ipairs(fnArgs) do
        ret = ret..v
    end
    return ret
end

for line in file:lines() do
    local editLine = line
    local words = {}
    for word in string.gmatch(line, "([^ \t]+)") do
        table.insert(words, word)
    end
    for i,word in ipairs(words) do
        if word == "+=" then
            editLine = concentate(words[1], " = "..words[1].." + ", unpack(words, 3))
            break
        elseif word == "-=" then
            editLine = concentate(words[1], " = "..words[1].." - ", unpack(words, 3))
            break
        elseif word == "*=" then
            editLine = concentate(words[1], " = "..words[1].." * ", unpack(words, 3))
            break
        elseif word == "/=" then
            editLine = concentate(words[1], " = "..words[1].." / ", unpack(words, 3))
            break
        elseif word == "%=" then
            editLine = concentate(words[1], " = "..words[1].." % ", unpack(words, 3))
            break
        elseif word == ">>=" then
            editLine = concentate(words[1], " = bit.brshift("..words[1]..", ", unpack(words, 3),")")
            break
        elseif word == "<<=" then
            editLine = concentate(words[1], " = bit.blshift("..words[1]..", ", unpack(words, 3),")")
            break
        elseif word == "&=" then
            editLine = concentate(words[1], " = bit.band("..words[1]..", ", unpack(words, 3),")")
            break
        elseif word == "^=" then
            editLine = concentate(words[1], " = bit.bxor("..words[1]..", ", unpack(words, 3),")")
            break
        elseif word == "|=" then
            editLine = concentate(words[1], " = bit.bor("..words[1]..", ", unpack(words, 3),")")
            break
        end
    end
    file2.writeLine(editLine)
end
file2.close()
file:close()