Code:
  (lambda ()
    (setq indent-tabs-mode nil)
    (setq lua-ts-indent-offset 2)
    (lua-ts-mode)
    (indent-region (point-min) (point-max)))

Name: Basic Indent

=-=
      print(
0,
      1
)

local function f(o)
   if o.x > o.y then
 return o.x
elseif o.y > o.z then
           return o.y
      else
return o.z
            end
end

f({
 x = 1,
  y = 2,
   z = 3,
})

;(function()
return false
)()
=-=
print(
  0,
  1
)

local function f(o)
  if o.x > o.y then
    return o.x
  elseif o.y > o.z then
    return o.y
  else
    return o.z
  end
end

f({
  x = 1,
  y = 2,
  z = 3,
})

;(function()
  return false
)()
=-=-=

Name: Argument Indent

=-=
function h(
string,
number,
options)
print(string, number, options)
end

local p = h(
"sring",
	 1000,
      {
cost = 2,
length = 8,
	parallelism = 4,
})
=-=
function h(
  string,
  number,
  options)
  print(string, number, options)
end

local p = h(
  "sring",
  1000,
  {
    cost = 2,
    length = 8,
    parallelism = 4,
  })
=-=-=

Name: Continuation Indent

=-=
function f()
  local str = [[
  multi-line
	string
    ]]
--[[
multi-line
comment
    ]]
return true
end
=-=
function f()
  local str = [[
  multi-line
	string
    ]]
  --[[
multi-line
comment
    ]]
  return true
end
=-=-=

Name: Loop Indent

=-=
for k, v in pairs({}) do
	 print(k, v)
end

while n < 10 do
n = n + 1
end

repeat
z = z * 2
 until z > 12
=-=
for k, v in pairs({}) do
  print(k, v)
end

while n < 10 do
  n = n + 1
end

repeat
  z = z * 2
until z > 12
=-=-=