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Here is 2html, the Lua program we use to convert .of to .html.

#!/usr/bin/env lua5.2


-- special marks:
-- \1 - paragraph (empty line)
-- \4 - remove spaces around it
-- \3 - ref (followed by label|)

---------------------------------------------------------------
header = [[
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<html>

<head>
<title>Lua 5.3 Reference Manual</title>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
<link rel="stylesheet" href="lua.css">
<link rel="stylesheet" href="manual.css">
</head>

<body bgcolor="#FFFFFF">

<hr>
<h1>
<a href="http://www.lua.org/home.html";><img src="logo.gif" alt="[Lua logo]" border="0"></a>
Lua 5.3 Reference Manual
</h1>

by Roberto Ierusalimschy, Luiz Henrique de Figueiredo, Waldemar Celes
<p>
<small>
<a href="http://www.lua.org/copyright.html";>Copyright</a>
&copy; 2015 Lua.org, PUC-Rio.  All rights reserved.
</small>
<hr>

<!-- ====================================================================== -->
<p>

]]

footer = "\n\n</body></html>\n\n"

local seefmt = '(see %s)'

if arg[1] == 'port' then
  seefmt = '(ver %s)'
  header = string.gsub(header, "by (.-)\n",
  "%1\n<p>Tradu&ccedil;&atilde;o: S&eacute;rgio Queiroz de Medeiros", 1)
  header = string.gsub(header, "Lua (%d+.%d+) Reference Manual",
                               "Manual de Refer&ecirc;ncia de Lua %1")
  header = string.gsub(header, "All rights reserved",
                               "Todos os direitos reservados")
end


---------------------------------------------------------------

local function compose (f,g)
  assert(f and g)
  return function (s) return g(f(s)) end
end

local function concat (f, g)
  assert(f and g)
  return function (s) return f(s) .. g(s) end
end


local Tag = {}


setmetatable(Tag, {
  __index = function (t, tag)
      local v = function (n, att)
        local e = ""
        if type(att) == "table" then
          for k,v in pairs(att) do e = string.format('%s %s="%s"', e, k, v) end
        end
        if n then
          return string.format("<%s%s>%s</%s>", tag, e, n, tag)
        else
          return string.format("<%s%s>", tag, e)
        end
      end
      t[tag] = v
      return v
  end
})



---------------------------------------------------------------
local labels = {}


local function anchor (text, label, link, textlink)
  if labels[label] then
    error("label " .. label .. " already defined")
  end
  labels[label] = {text = textlink, link = link}
  return Tag.a(text, {name=link})
end

local function makeref (label)
  assert(not string.find(label, "|"))
  return string.format("\3%s\3", label)
end

local function ref (label)
  local l = labels[label]
  if not l then
    io.stderr:write("label ", label, " undefined\n")
    return "@@@@@@@"
  else
    return Tag.a(l.text, {href="#"..l.link})
  end
end

---------------------------------------------------------------
local function nopara (t)
  t = string.gsub(t, "\1", "\n\n")
  t = string.gsub(t, "<p>%s*</p>", "")
  return t
end

local function fixpara (t)
  t = string.gsub(t, "\1", "\n</p>\n\n<p>\n")
  t = string.gsub(t, "<p>%s*</p>", "")
  return t
end

local function antipara (t)
  return "</p>\n" .. t .. "<p>"
end


Tag.pre = compose(Tag.pre, antipara)
Tag.ul = compose(Tag.ul, antipara)

---------------------------------------------------------------
local Gfoots = 0
local footnotes = {}

local line = Tag.hr(nil)

local function dischargefoots ()
  if #footnotes == 0 then return "" end
  local fn = table.concat(footnotes)
  footnotes = {}
  return line .. Tag.h3"footnotes:" .. fn .. line
end


local Glists = 0
local listings = {}

local function dischargelist ()
  if #listings == 0 then return "" end
  local l = listings
  listings = {}
  return line .. table.concat(l, line..line) .. line
end

---------------------------------------------------------------
local counters = {
h1 = {val = 1},
h2 = {father = "h1", val = 1},
h3 = {father = "h2", val = 1},
listing = {father = "h1", val = 1},
}

local function inccounter (count)
  counters[count].val = counters[count].val + 1
  for c, v in pairs(counters) do
    if v.father == count then v.val = 1 end
  end
end

local function getcounter (count)
  local c = counters[count]
  if c.father then
    return getcounter(c.father) .. "." .. c.val
  else
    return c.val .. ""
  end
end
---------------------------------------------------------------


local function fixed (x)
  return function () return x end
end

local function id (x) return x end


local function prepos (x, y)
  assert(x and y)
  return function (s) return string.format("%s%s%s", x, s, y) end
end


local rw = Tag.b




local function LuaName (name)
  return Tag.code(name)
end


local function getparam (s)
  local i, e = string.find(s, "^[^%s@|]+|")
  if not i then return nil, s
  else return string.sub(s, i, e - 1), string.sub(s, e + 1)
  end
end


local function gettitle (h)
  local title, p = assert(string.match(h, "<title>(.-)</title>()"))
  return title, string.sub(h, p)
end

local function getparamtitle (what, h, nonum)
    local label, title, c, count
    label, h = getparam(h)
    title, h = gettitle(h)
    if not nonum then
      count = getcounter(what)
      inccounter(what)
      c = string.format("%s &ndash; ", count)
    else
      c = ""
    end
    label = label or count
    if label then
      title = anchor(title, label, count, "&sect;"..count)
    end
    title = string.format("%s%s", c, title)
    return title, h
end

local function section (what, nonum)
  return function (h)
    local title
    title, h = getparamtitle(what, h, nonum)
    local fn = what == "h1" and dischargefoots() or ""
    h = fixpara(Tag.p(h))
    return "</p>\n" .. Tag[what](title) .. h .. fn ..
           dischargelist() .. "<p>"
  end
end


local function verbatim (s)
  s = nopara(s)
  s = string.gsub(s, "\n", "\n     ")
  s = string.gsub(s, "\n%s*$", "\n")
  return Tag.pre(s)
end


local function verb (s)
  return Tag.code(s)
end


local function lua2link (e)
  return string.find(e, "luaL?_") and e or "pdf-"..e
end


local verbfixed = verb


local Tex = {

ANSI = function (func)
           return "ISO&nbsp;C function " .. Tag.code(func)
         end,
At = fixed"@",
B = Tag.b,
bigskip = fixed"",
bignum = id,
C = fixed"",
Ci = prepos("<!-- ", " -->"),
CId = function (func)
        return "C&nbsp;function " .. Tag.code(func)
      end,
chapter = section"h1",
Char = compose(verbfixed, prepos("'", "'")),
Cdots = fixed"&middot;&middot;&middot;",
Close = fixed"}",
col = Tag.td,
defid = function (name)
          local l = lua2link(name)
          local c = Tag.code(name)
          return anchor(c, l, l, c)
        end,
def = Tag.em,
description = compose(nopara, Tag.ul),
Em = fixed("\4" .. "&mdash;" .. "\4"),
emph = Tag.em,
emphx = Tag.em,    -- emphasis plus index (if there was an index)
En = fixed("&ndash;"),
format = fixed"",
["false"] = fixed(Tag.b"false"),
id = Tag.code,
idx = Tag.code,
index = fixed"",
Lidx = fixed"",  -- Tag.code,
ldots = fixed"...",
x = id,
itemize = compose(nopara, Tag.ul),
leq = fixed"&le;",
Lid = function (s)
        return makeref(lua2link(s))
      end,
M = Tag.em,
N = function (s) return (string.gsub(s, " ", "&nbsp;")) end,
NE = id,        -- tag"foreignphrase",
num = id,
["nil"] = fixed(Tag.b"nil"),
Open = fixed"{",
part = section("h1", true),
Pat = compose(verbfixed, prepos("'", "'")),
preface = section("h1", true),
psect = section("h2", true),
Q = prepos('"', '"'),
refchp = makeref,
refcode = makeref,
refsec = makeref,

pi = fixed"&pi;",
rep = Tag.em,  -- compose(prepos("&lt;", "&gt;"), Tag.em),
Rw = rw,
rw = rw,
sb = Tag.sub,
sp = Tag.sup,
St = compose(verbfixed, prepos('"', '"')),
sect1 = section"h1",
sect2 = section"h2",
sect3 = section"h3",
sect4 = section("h4", true),
simplesect = id,
Tab2 = function (s) return Tag.table(s, {border=1}) end,
row = Tag.tr,
title = Tag.title,
todo = Tag.todo,
["true"] = fixed(Tag.b"true"),
T = verb,

item = function (s)
         local t, p = string.match(s, "^([^\n|]+)|()")
         if t then
           s = string.sub(s, p)
           s = Tag.b(t..": ") .. s
         end
         return Tag.li(fixpara(s))
       end,

verbatim = verbatim,

manual = id,


-- for the manual

link =function (s)
  local l, t = getparam(s)
  assert(l)
  return string.format("%s (%s)", t, makeref(l))
end,

see = function (s) return string.format(seefmt, makeref(s)) end,
See = makeref,
seeC = function (s)
         return string.format(seefmt, makeref(s))
       end,

seeF = function (s)
         return string.format(seefmt, makeref(lua2link(s)))
       end,

APIEntry = function (e)
  local h, name
  h, e = string.match(e, "^%s*(.-)%s*|(.*)$")
  name = string.match(h, "(luaL?_[%w_]+)%)? +%(") or
         string.match(h, "luaL?_[%w_]+")
  local a = anchor(Tag.code(name), name, name, Tag.code(name))
  local apiicmd, ne = string.match(e, "^(.-</span>)(.*)")
--io.stderr:write(e)
  if not apiicmd then
    return antipara(Tag.hr() .. Tag.h3(a)) .. Tag.pre(h) .. e
  else
    return antipara(Tag.hr() .. Tag.h3(a)) .. apiicmd .. Tag.pre(h) .. ne
  end
end,

LibEntry = function (e)
  local h, name
  h, e = string.match(e, "^(.-)|(.*)$")
  name = string.gsub(h, " (.+", "")
  local l = lua2link(name)
  local a = anchor(Tag.code(h), l, l, Tag.code(name))
  return Tag.hr() .. Tag.h3(a) .. e
end,

Produc = compose(nopara, Tag.pre),
producname = prepos("\t", " ::= "),
Or = fixed" | ",
VerBar = fixed"&#124;",  -- vertical bar
OrNL = fixed" | \4",
bnfNter = prepos("", ""),
bnfopt = prepos("[", "]"),
bnfrep = prepos("{", "}"),
bnfter = compose(Tag.b, prepos("&lsquo;", "&rsquo;")),
producbody = function (s)
           s = string.gsub(s, "%s+", " ")
           s = string.gsub(s, "\4", "\n\t\t")
           return s
         end,

apii = function (s)
        local pop,push,err = string.match(s, "^(.-),(.-),(.*)$")
        if pop ~= "?" and string.find(pop, "%W") then
          pop = "(" .. pop .. ")"
        end
        if push ~= "?" and string.find(push, "%W") then
          push = "(" .. push .. ")"
        end
        err = (err == "-") and "&ndash;" or Tag.em(err)
        return Tag.span(
                 string.format("[-%s, +%s, %s]", pop, push, err),
                 {class="apii"}
               )
      end,
}

local others = prepos("?? "," ??")

local function trata (t)
  t = string.gsub(t, "@(%w+)(%b{})", function (w, f)
        f = trata(string.sub(f, 2, -2))
        if type(Tex[w]) ~= "function" then
         io.stderr:write(w .. "\n")
         return others(f)
        else
         return Tex[w](f, w)
        end
      end)
  return t
end


---------------------------------------------------------------------
---------------------------------------------------------------------

-- read whole book
t = io.read"*a"

t = string.gsub(t, "[<>&\128-\255]",
  {["<"] = "&lt;",
   [">"] = "&gt;",
   ["&"] = "&amp;",
   ["\170"] = "&ordf;",
   ["\186"] = "&ordm;",
   ["\192"] = "&Agrave;",
   ["\193"] = "&Aacute;",
   ["\194"] = "&Acirc;",
   ["\195"] = "&Atilde;",
   ["\199"] = "&Ccedil;",
   ["\201"] = "&Eacute;",
   ["\202"] = "&Ecirc;",
   ["\205"] = "&Iacute;",
   ["\211"] = "&Oacute;",
   ["\212"] = "&Ocirc;",
   ["\218"] = "&Uacute;",
   ["\224"] = "&agrave;",
   ["\225"] = "&aacute;",
   ["\226"] = "&acirc;",
   ["\227"] = "&atilde;",
   ["\231"] = "&ccedil;",
   ["\233"] = "&eacute;",
   ["\234"] = "&ecirc;",
   ["\237"] = "&iacute;",
   ["\243"] = "&oacute;",
   ["\244"] = "&ocirc;",
   ["\245"] = "&otilde;",
   ["\250"] = "&uacute;",
   ["\252"] = "&uuml;"
  })

t = string.gsub(t, "\n\n+", "\1")



-- complete macros with no arguments
t = string.gsub(t, "(@%w+)([^{%w])", "%1{}%2")

t = trata(t)

-- correct references
t = string.gsub(t, "\3(.-)\3", ref)

-- remove extra space (??)
t = string.gsub(t, "%s*\4%s*", "")

t = nopara(t)

-- HTML 3.2 does not need </p> (but complains when it is in wrong places :)
t = string.gsub(t, "</p>", "")

io.write(header, t, footer)