Simple Argument Parser API

--[[ Argument Parser API
       By  RodrickLord

Code Example:
Shell: "<program> --config1 --config2 true --config3 diamond"

args = api.parse(...)

args = {
  config1 = true,
  config2 = true,
  config3 = "diamond",
}
]]

l = string.lower

local function strTable(s)
  local t = {}
  for i in string.gmatch(s, "%s+") do
    table.insert(t, i)
  end
  return t
end

function parse(t,start)
  local start = start or "--"
  local r = {}
  if type(t) == "string" then
    t = strTable(t)
  end
  if type(t) == "table" then
    for i = 1,#t do
      if t[i]:sub(1,#start) == start then
        if l(t[i+1]) == "true" or l(t[i+1]) == "t" or l(t[i+1]) == "yes" or l(t[i+1]) == "y" or t[i+1]:sub(1,#start) == start then
          r[t[i]] = true
        elseif l(t[i+1]) == "false" or l(t[i+1]) == "t" or l(t[i+1]) == "no" or l(t[i+1]) == "n" then
          r[t[i]] = false
        else
          r[t[i]] = t[i+1]
        end
      end
    end
    return r
  end
  return false
end