-- Initialization
log = ""
oldprint=print
function print(...)
 oldprint(...)
 logline = ""
 if #{...} > 0 then
  if #{...} > 1 then
   for k,v in ipairs({...}) do
    logline = logline .. "\t" .. tostring(v)
   end
  else
   tA = {...}
  logline = tostring(tA[1])
  end
 end
 log = (log .. logline .. "\n"):sub(1,-1)
end
print("Initializing and reading configuration")
ts={}
tA = {...}
ss=""
cfg={}
f=io.open("build.cfg","rb")
repeat
 line = f:read("*l")
 if line ~= nil then
  w={}
  for wo in line:gmatch("%S+") do table.insert(w, wo) end
  cfg[w[1]] = w[2]
 end
until line == nil or line == ""
if cfg.opath == nil then cfg.opath = "kernel.lua" end
print()
-- Module list
print("Reading modules to load")
tm={}
f=io.open("modules.cfg","rb")
function nl()
 return f:read("*l")
end
for line in nl do
 print(" - "..line)
 table.insert(tm,line)
end
f:close()
print(tostring(#tm).." modules to load.\n")

-- Loading modules
print("Loading modules")
for k,v in ipairs(tm) do
 print(" - "..v.." - modules/"..v)
 f=io.open("modules/"..v,"rb")
 if cfg.optomise == "yes" then
  data = f:read("*a")
 else
  data = "--"..v.."\n"..f:read("*a")
 end
 table.insert(ts,data)
 f:close()
end
print(tostring(#tm).." modules loaded.\n")

-- Generate source
print("Generating source")
for k,v in pairs(ts) do
 ss=ss..v
 io.write(".")
end
print()

-- Optomise for space
if cfg.optomise == "yes" then
print("Optomising source")
sl=tostring(ss:len())
no=0
replacements={
{"  "," "},
{"\n ","\n"},
{"\n\n","\n"},
{" == ","=="},
{" ~= ","~="},
{" >= ",">="},
{" <= ","<="},
{" > ",">"},
{" < ","<"},
{" = ","="},
{", ",","},
{" %+ ","+"},
{" %- ","-"},
{" %/ ","/"},
{" %* ","*"},
{" \n","\n"},
}
for k,v in ipairs(replacements) do
 while ss:find(v[1]) ~= nil do
  ss=ss:gsub(v[1],v[2])
  io.write(".")
  no=no+1
 end
end
print("\nBefore: "..sl.."\nAfter: "..tostring(ss:len()).."\n"..tostring(no).." optomisations made.\n")
end

-- Output
print("Outputting to "..cfg.opath)
f=io.open(cfg.opath,"wb")
f:write(ss)
f:close()
print("Total size: "..tostring(ss:len()).."\n")

-- Check syntax
if cfg.test == "yes" then
print("Checking for errors...")
err={pcall(load,ss)}
if err[1] ~= true then
 print(table.unpack(err))
else
 print("No errors detected by load()")
end
end

-- Write log
if cfg.log == "yes" then
f=io.open("build.log","wb")
f:write(log)
f:close()
end