dig.lua

-- Cloned
-- This is an API for digging and
-- keeping track of motion
-- <[email protected]>

-- x is right, y is up, z is forward
-- r is clockwise rotation in degrees

-------------------------------------
-- |¯\  [¯¯]  /¯¯]    /\  |¯\ [¯¯] --
-- |  |  ][  | [¯|   |  | | /  ][  --
-- |_/  [__]  \__|   |||| ||  [__] --
-------------------------------------

os.loadAPI("flex.lua")

local options = {
  "outputblocks",
  "blacklist",
  "buildingblocks",
  "dumplist",
  "fluids"  }


-- Fluids, aka blocks treated as "Empty"
options[options[5]] = {
  ":air", "water", "lava", "acid", "poison",
  "sewage", "sludge", "blood"  }


-- Turtle will only drop loot into blocks
-- that contain any of these keywords.
options[options[1]] = {
  "chest", "storage", "box", "turtle",
  "hopper", "dropper", "backpack" }


-- Turtle will avoid breaking (or getting
-- stuck by) these blocks.
-- Disabled by default;
-- enable with dig.doBlacklist()
options[options[2]] = { "chest", "spawn",
    "hopper", "dropper", "portal", "turtle",
    "hive", "openblocks:grave" }
doblacklist = false
function doBlacklist(x)
 if x == nil then
  x = true
 end --if
 doblacklist = (x==true)
end --function


-- Run dig.setBlockSlot(n) to choose
-- a slot to keep building blocks stocked
-- The list of valid keywords:
options[options[3]] = { "cobblestone",
  "minecraft:stone", "dirt", "netherrack",
  "basalt", "soul_s", "magma_block",
  "terracotta", "rock", "sandstone",
  "andesite", "diorite", "granite",
  "marble", "bricks", "smooth_stone",
  "glass" }
function isBuildingBlock(n)
 return flex.isItem(options[options[3]],n)
end --function



-- Turtle will dispose of these blocks
-- at the command dig.doDump()/
-- dig.doDumpUp()/dig.doDumpDown().
-- You may add/remove entries by using
-- dig.addToDumpList(<string>) or
-- dig.removeFromDumpList(<string>).
local dump = options[4]
options[dump] = {}

function resetDumpList(n)
 if n == 0 then
  options[dump] = {}
 else
  options[dump] = {
     "cobblestone", "dirt", "gravel",
     "andesite", "diorite", "granite",
     "netherrack", "soul_s", "magma_block",
     "rotten_flesh", "rock", "marble",
     "limestone", "soapstone", "dolomite",
     "gabbro", "scoria", "diorite", "granite", "slate" }
 end --if/else
end --function

function isDumpItem(x)
 return flex.isItem(options["dump"],x)
end --function

function addToDumpList(newkey)
 options[dump][#options[dump]+1] =
     tostring(newkey)
end --function

function removeFromDumpList(key)
 local x,z
 z = {}
 for x=1,#options[dump] do
  if string.find(options[dump][x],key)==nil then
   z[#z+1] = options[dump][x]
  end --if
 end --for
 options[dump] = z
end --function

resetDumpList()


function doDump(z)
 z = z or "fwd"
 local slot = turtle.getSelectedSlot()
 local blockCount = blockStacks
 local x
 for x=1,16 do
  turtle.select(x)
  if flex.isItem(options[dump]) then

   if flex.isItem(options["buildingblocks"]) then
    blockCount = blockCount - 1
   end --if

   if blockCount <= 0 then
    if z == "fwd" then
     turtle.drop()
    elseif z == "down" then
     turtle.dropDown()
    elseif z == "up" then
     turtle.dropUp()
    end --if/else (direction)
   end --if (no more blocks needed)

  end --if dump item
 end --for
 checkBlocks()
 flex.condense(blockSlot)
 turtle.select(slot)
end --function

function doDumpDown() doDump("down") end
function doDumpUp() doDump("up") end




-- Attack entities that block the way
attack = false
function doAttack(x)
 if x == nil then
  x = true
 end --if
 attack = ( x == true )
end --function


function isChest(dir)
 return flex.isBlock(
   options["outputblocks"],dir)
end --function
function isChestUp()
 return isChest("up")
end
function isChestDown()
 return isChest("down")
end


local knownBedrock = {}
function getKnownBedrock()
 return knownBedrock
end --function




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--  /¯\ |¯\[¯¯][¯¯] /¯\ |\ ||/¯¯\ --
-- | O || / ||  ][ | O || \ |\_¯\ --
--  \_/ ||  || [__] \_/ || \|\__/ --
------------------------------------
--      |¯¯][¯¯]||  |¯¯]          --
--      | ]  ][ ||_ | ]           --
--      ||  [__]|__]|__]          --
------------------------------------

local options_file = "dig_options.cfg"

function optionsEdit()
 shell.run("edit "..options_file)
 optionsImport()
end --function


function optionsImport()
 if not fs.exists(options_file) then
  return false
 end --if
 local file,x,y,z

 for y=1,#options do
  z = options[y]
  file = fs.open(options_file,"r")

  x = file.readLine()
  while x ~= nil do

   if x == "["..z.."]" then
    options[z] = {}
    x = file.readLine()
    while x ~= "[/"..z.."]" and x ~= nil do
     options[z][#options[z]+1] = x
     x = file.readLine()
    end --while
    break
   end --if

   x = file.readLine()
  end --while

  file.close()
 end --for

 return true
end --function


function optionsExport()
 if fs.exists(options_file) then
  fs.delete(options_file)
 end --if

 local file,x,y,z
 while file == nil do
  file = fs.open(options_file,"w")
 end --while
 file.writeLine("# Dig API Options File #\n")

 for y=1,#options do
  z = options[y]
  file.writeLine("["..z.."]")
  for x=1,#options[z] do
   file.writeLine(options[z][x])
  end --for
  file.writeLine("[/"..z.."]\n")
 end --for

 file.close()
 return true
end --function


if not optionsImport() then
 optionsExport()
end --if




----------------------------------
--    /¯¯\  /\  ||  || |¯¯]     --
--    \_¯\ |  |  \\//  | ]      --
--    \__/ ||||   \/   |__]     --
----------------------------------
-- |¯\  /\   /¯] ||// || || |¯\ --
-- | < |  | | [  | <  ||_|| | / --
-- |_/ ||||  \_] ||\\  \__| ||  --
----------------------------------

local save = {"dig_save", ".cfg"}
local savefile = save[1] .. save[2]
local start = {"startup", ".lua"}
local startfile = start[1] .. start[2]

function saveExists()
 return ( fs.exists(startfile) and
    fs.exists(savefile) )
end --function

function saveClear()
 if fs.exists(startfile) then
  fs.delete(startfile)
 end --if
end --function
function clearSave()
 saveClear()
end --function


local args = {...}
if #args > 0 then
 local a,file

 if args[1] == "save" then
  if not saveExists() then
   flex.send("Nothing to save",colors.yellow)
   return
  end --if
  if #args == 1 then
   a = 1
   while fs.exists(start[1].."_"..
        tostring(a)..start[2]) do
    a = a + 1
   end --while
  else -- #args > 1
   a = args[2]
  end --if
  a = tostring(a)
  shell.run("mv "..startfile.." "..
      start[1].."_"..a..start[2])
  shell.run("mv "..savefile.." " ..
      save[1].."_"..a..save[2])
  flex.send("Enter 'dig load "..a..
      "' to restore",colors.lightBlue)

 elseif args[1] == "load" then
  if #args == 1 then
   flex.send("Please specify load file",
     colors.red)
   return
  end --if
  saveClear()
  a = args[2]
  shell.run("mv "..start[1].."_"..a..
     start[2].." "..startfile)
  shell.run("mv "..save[1].."_"..a..
     save[2].." "..savefile)
  flex.send("Save files restored",
     colors.lightBlue)

 elseif args[1] == "clear" then
  saveClear()
  flex.send("Save files cleared",
      colors.lightBlue)

 elseif args[1] == "edit" then
  optionsEdit()

 else -- not save/load/clear/edit
  flex.send("Invalid parameter: "..
      args[1],colors.red)

 end --if/else save/load
 return
end --function


-----------------------------------------
-- ||   /¯\  /¯] /\ [¯¯][¯¯] /¯\ |\ || --
-- ||_ | O || [ |  | ||  ][ | O || \ | --
-- |__] \_/  \_]|||| || [__] \_/ || \| --
-----------------------------------------
--||  || /\ |¯\[¯¯] /\ |¯\||  |¯¯]/¯¯\ --
-- \\// |  || / ][ |  || <||_ | ] \_¯\ --
--  \/  ||||| \[__]|||||_/|__]|__]\__/ --
-----------------------------------------

xdist = 0
xlast = -1
xmin = 0
xmax = 0

ydist = 0
ylast = -1
ymin = 0
ymax = 0

zdist = 0
zlast = -1
zmin = 0
zmax = 0

rdist = 0
rlast = -1

lastmove = "r-"
dugtotal = 0


function getx() return xdist end
function gety() return ydist end
function getz() return zdist end
function getr() return rdist end

function setx(x) xdist = x end
function sety(y) ydist = y end
function setz(z) zdist = z end
function setr(r) rdist = r end

function getxmin() return xmin end
function getxmax() return xmax end
function getymin() return ymin end
function getymax() return ymax end
function getzmin() return zmin end
function getzmax() return zmax end

function setxmin(x) xmin = x end
function setxmax(x) xmax = x end
function setymin(y) ymin = y end
function setymax(y) ymax = y end
function setzmin(z) zmin = z end
function setzmax(z) zmax = z end

function getxlast() return xlast end
function getylast() return ylast end
function getzlast() return zlast end
function getrlast() return rlast end

function setxlast(x) xlast = x end
function setylast(y) ylast = y end
function setzlast(z) zlast = z end
function setrlast(r) rlast = r end

function getlast() return lastmove end
function setlast(lm) lastmove = lm end

function getdug() return dugtotal end
function setdug(d) dugtotal = d end




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--||   /¯\  /\ |¯\   ///¯¯\ /\ ||  |||¯¯]--
--||_ | O ||  ||  | // \_¯\|  | \\// | ] --
--|__] \_/ |||||_/ //  \__/||||  \/  |__]--
-------------------------------------------

function location()
 return
  { xdist, ydist, zdist, rdist,
    xmin, xmax, ymin, ymax, zmin, zmax,
    xlast, ylast, zlast, rlast,
    lastmove, dugtotal }
end


function saveCoords(loc,save)
 loc = loc or location()
 save = save or savefile
 local file,x

 --if fs.exists(save.."_old") then
 -- fs.delete(save.."_old")
 --end
 --if fs.exists(save) then
  --fs.move(save, save.."_old")
 --end

 while file == nil do
  file = fs.open(save,"w")
 end --while

 for x=1,#loc do
  file.writeLine(tostring(loc[x]))
  if x == 4 then file.flush() end
 end --for

 file.close()
end --function



function loadCoords(save)
 save = save or savefile
 local file
 if fs.exists(save) then
  while file == nil do
   file = fs.open(save,"r")
  end --while
  xdist = tonumber(file.readLine() or xdist)
  ydist = tonumber(file.readLine() or ydist)
  zdist = tonumber(file.readLine() or zdist)
  rdist = tonumber(file.readLine() or rdist)
  xmin = tonumber(file.readLine() or xmin)
  xmax = tonumber(file.readLine() or xmax)
  ymin = tonumber(file.readLine() or ymin)
  ymax = tonumber(file.readLine() or ymax)
  zmin = tonumber(file.readLine() or zmin)
  zmax = tonumber(file.readLine() or zmax)
  xlast = tonumber(file.readLine() or xlast)
  ylast = tonumber(file.readLine() or ylast)
  zlast = tonumber(file.readLine() or zlast)
  rlast = tonumber(file.readLine() or rlast)
  lastmove = file.readLine() or lastmove
  dugtotal = tonumber(file.readLine() or dugtotal)
  file.close()
  return true

 else
  --if fs.exists(save.."_old") then
  -- loadCoords(save.."_old")
  -- return true
  --end

  return false
 end --if/else

end -- function



function makeStartup(command, args)
 command = tostring(command)
 args = args or {}
 local x
 for x=1,#args do
  command = command.." "..args[x]
 end --for

 local file = fs.open(startfile,"w")
 file.writeLine("print(\"> "..command.."\")")
 file.writeLine("for x=5,1,-1 do")
 file.writeLine(" term.write(tostring(x)..\" \")")
 file.writeLine(" sleep(1)")
 file.writeLine("end --for")
 file.writeLine("print(\" \")")
 file.writeLine("shell.run(\""..command.."\")")
 file.close()
end --function




-------------------------------------
--[¯¯]|¯\ /\  /¯]||//[¯¯]|\ || /¯¯]--
-- || | /|  || [ | <  ][ | \ || [¯|--
-- || | \|||| \_]||\\[__]|| \| \__|--
-------------------------------------

function update(n)

 if n=="fwd" then

  if rdist%360 == 0 then -- 12:00
   zdist = zdist + 1
   zlast = 1
   lastmove = "z+"

  elseif rdist%360 == 90 then -- 3:00
   xdist = xdist + 1
   xlast = 1
   lastmove = "x+"

  elseif rdist%360 == 180 then -- 6:00
   zdist = zdist - 1
   zlast = -1
   lastmove = "z-"

  elseif rdist%360 == 270 then -- 9:00
   xdist = xdist - 1
   xlast = -1
   lastmove = "x-"

  end --if/else


 elseif n=="back" then

  if rdist%360 == 0 then -- 12:00
   zdist = zdist - 1
   zlast = -1
   lastmove = "z-"

  elseif rdist%360 == 90 then -- 3:00
   xdist = xdist - 1
   xlast = -1
   lastmove = "x-"

  elseif rdist%360 == 180 then -- 6:00
   zdist = zdist + 1
   zlast = 1
   lastmove = "z+"

  elseif rdist%360 == 270 then -- 9:00
   xdist = xdist + 1
   xlast = 1
   lastmove = "x+"

  end --if/else


 elseif n=="up" then
  ydist = ydist + 1
  ylast = 1
  lastmove = "y+"

 elseif n=="down" then
  ydist = ydist - 1
  ylast = -1
  lastmove = "y-"

 elseif n=="right" then
  rdist = rdist + 90
  rlast = 1
  lastmove = "r+"
  while rdist > 999 do
   rdist = rdist - 360
  end --while

 elseif n=="left" then
  rdist = rdist - 90
  rlast = -1
  lastmove = "r-"
  while rdist < -999 do
   rdist = rdist + 360
  end --while

 end --if/else


 if xdist < xmin then
  xmin = xdist
 elseif xdist > xmax then
  xmax = xdist
 end

 if ydist < ymin then
  ymin = ydist
 elseif ydist > ymax then
  ymax = ydist
 end

 if zdist < zmin then
  zmin = zdist
 elseif zdist > zmax then
  zmax = zdist
 end

 saveCoords()

end




------------------------------------------
-- |\/| /¯\ ||  |||¯¯]|\/||¯¯]|\ ||[¯¯] --
-- |  || O | \\// | ] |  || ] | \ | ||  --
-- |||| \_/   \/  |__]|||||__]|| \| ||  --
------------------------------------------


stuck = false
function isStuck()
 return stuck
end
stuckDir = "none"
function getStuckDir()
 return stuckDir
end


function left(n)
 n = (n or 1)
 if n < 0 then
  return right(-n)
 end --if
 local x
 for x=1,n do
  turtle.turnLeft()
  update("left")
 end --if
 return true
end --function


function right(n)
 n = (n or 1)
 if n < 0 then
  return left(-n)
 end --if
 local x
 for x=1,n do
  turtle.turnRight()
  update("right")
 end --if
 return true
end --function



local unbreak = "Unbreakable block detected"
local protect = "Cannot break protected block"



function up(n)
 n = n or 1
 if n < 0 then
  return down(-n)
 end --if

 local x,a,b,t

 for x=1, n do
  refuel()

  if not turtle.up() then

   if doblacklist then
    -- Blocks not to mine
    if flex.isBlockUp(options["blacklist"]) then
     if not back() then return false end
     if not up() then return false end
     return true
    end --if
   end --if

   t = os.time()
   stuck = false
   while not turtle.up() do
    a,b = turtle.digUp()
    while a do
     dugtotal = dugtotal + 1
     a,b = turtle.digUp()
    end --while

    if b == protect then
     if doblacklist then
      options["blacklist"][
         #options["blacklist"]+1]
         = flex.getBlockUp()
      return up(n-x+1)
     else
      b = unbreak
     end --if
    end --if

    if b == unbreak then
     flex.send("#1"..b.."#0: {#8"..
       tostring(getx()).."#0,#8"..
       tostring(gety()+1).."#0,#8"..
       tostring(getz()).."#0}")
     knownBedrock[#knownBedrock+1] = {
       getx(), gety()+1, getz() }
     stuck = true
     stuckDir = "up"
     return false
    end --if
    if a then
     dugtotal = dugtotal + 1
    end --if
    if attack then turtle.attackUp() end

    if (os.time()-t)/24*20*60 > 20 then
     -- Stuck for at least 20 seconds
     -- Usually caused by height limits
     flex.send("Unable to move up",colors.orange)
     stuck = true
     stuckDir = "up"
     return false
    end --if

   end --while

  end --if can't move

  update("up")
 end --for

 return true
end --function



function down(n)
 n = n or 1
 if n < 0 then
  return up(-n)
 end --if

 local x,a,b,t

 for x=1, n do
  refuel()

  if not turtle.down() then

   if doblacklist then
    -- Blocks not to mine
    if flex.isBlockDown(options["blacklist"]) then
     if not fwd() then return false end
     if not down() then return false end
     return true
    end --if
   end --if

   t = os.time()
   stuck = false
   while not turtle.down() do
    a,b = turtle.digDown()
    while a do
     dugtotal = dugtotal + 1
     a,b = turtle.digDown()
    end --while

    if b == protect then
     if doblacklist then
      options["blacklist"][
        #options["blacklist"]+1 ]
        = flex.getBlockDown()
      return down(n-x+1)
     else
      b = unbreak
     end --if
    end --if

    if b == unbreak then
     flex.send("#1"..b.."#0: {#8"..
       tostring(getx()).."#0,#8"..
       tostring(gety()-1).."#0,#8"..
       tostring(getz()).."#0}")
     knownBedrock[#knownBedrock+1] = {
       getx(), gety()-1, getz() }
     stuck = true
     stuckDir = "down"
     return false
    end --if
    if a then
     dugtotal = dugtotal + 1
    end --if
    if attack then turtle.attackDown() end

    if (os.time()-t)/24*20*60 > 20 then
     -- Stuck for at least 20 seconds
     -- Usually caused by height limits
     flex.send("Unable to move down",colors.orange)
     stuck = true
     stuckDir = "down"
     return false
    end --if

   end --while

  end --if can't move

  update("down")
 end --for

 return true
end --function



function fwd(n)
 n = n or 1
 if n < 0 then
  return back(-n)
 end --if

 local x,z,a,b,t
 for x=1, n do
  refuel()

  if not turtle.forward() then

   if doblacklist then
    -- Blocks not to mine
    if flex.isBlock(options["blacklist"]) then
     if flex.isBlockUp(options["blacklist"]) then
      if flex.isBlockDown(options["blacklist"]) then

       -- Blocks above, below and in front
       if not back() then return false end
       if not up(2) then return false end
       if not fwd(2) then return false end
       if not down(2) then return false end
       return true

      else -- Blocks in front and above
       if not down() then return false end
       x = 0
       while flex.isBlock(options["blacklist"]) do
        x = x + 1
        if not down() then return false end
       end --while
       if not fwd(2) then return false end
       if not up(x) then return false end
       return
      end --if/else

     else
      -- Block in front
      if not up() then return false end
      if not fwd(2) then return false end
      if not down() then return false end
      return true
     end --if/else
    end --if
   end --if doblacklist

   t = os.time()
   stuck = false
   while not turtle.forward() do
    a,b = turtle.dig()
    while a do
     dugtotal = dugtotal + 1
     a,b = turtle.dig()
    end --while

    if b == protect then
     if doblacklist then
      options["blacklist"][
          #options["blacklist"]+1]
          = flex.getBlock()
      return fwd(n-x+1)
     else
      b = unbreak
     end --if
    end --if

    if b == unbreak then
     z = { getx(), gety(),
           getz(), getr()%360 }

     if z[4] == 0 then
      z[3] = z[3] + 1
     elseif z[4] == 90 then
      z[1] = z[1] + 1
     elseif z[4] == 180 then
      z[3] = z[3] - 1
     elseif z[4] == 270 then
      z[1] = z[1] - 1
     end --if/else

     flex.send("#1"..b.."#0: {#8"..
       tostring(z[1]).."#0,#8"..
       tostring(z[2]).."#0,#8"..
       tostring(z[3]).."#0}")
     knownBedrock[#knownBedrock+1] =
       { z[1], z[2], z[3] }
     stuck = true
     stuckDir = "fwd"
     return false
    end --if

    if a then
     dugtotal = dugtotal + 1
    end --if
    if attack then turtle.attack() end

    --if (os.time()-t)/24*20*60 > 120 then
     -- Stuck for at least 20 seconds
     --flex.send("Unable to move forward",colors.orange)
     --stuck = true
     --stuckDir = "fwd"
     --return false
     --t = os.time()
    --end --if

   end --while not turtle.forward()

  end --if can't move

  update("fwd")
 end --if

 return true
end --function



function back(n)
 n = n or 1
 if n < 0 then
  return fwd(-n)
 end --if

 local x,turn
 turn = false
 for x=1,n do
  if turn then
   if not fwd() then return false end
  elseif turtle.back() then
   update("back")
  else
   turn = true
   gotor(rdist+180)
   if not fwd() then return false end
  end --if/else
 end --for

 if turn then gotor(rdist-180) end
 return true
end --function



function dig(x)
 local a,b
 x = x or "fwd"

 if x=="fwd" then
  while turtle.dig() and not stuck do
   dugtotal = dugtotal + 1
  end --while

 elseif x=="up" then
  while turtle.digUp() and not stuck do
   dugtotal = dugtotal + 1
  end --while

 elseif x=="down" then
  while turtle.digDown() and not stuck do
   dugtotal = dugtotal + 1
  end --while

 end --if/else
end --function

function digUp() dig("up") end
function digDown() dig("down") end



-- Agressive placement functions

function place()
 local x = flex.getBlock("fwd")
 local t = os.time()
 while not turtle.place()
       and flex.isBlock(options["fluids"]) do
  if attack then
   turtle.attackUp()
   turtle.attack()
   turtle.attackDown()
  end --if

  if (os.time()-t)/24*20*60 > 20 then
   local z = { getx(), gety(),
         getz(), getr()%360 }
   if z[4] == 0 then
    z[3] = z[3] + 1
   elseif z[4] == 90 then
    z[1] = z[1] + 1
   elseif z[4] == 180 then
    z[3] = z[3] - 1
   elseif z[4] == 270 then
    z[1] = z[1] - 1
   end --if/else

   flex.send("#1End of world detected#0: {#8"..
     tostring(z[1]).."#0,#8"..
     tostring(z[2]).."#0,#8"..
     tostring(z[3]).."#0}")
   knownBedrock[#knownBedrock+1] =
     { z[1], z[2], z[3] }

   stuck = true
   stuckDir = "fwd"
   return false
  end --if

  sleep(0.1)
  x = flex.getBlock()
 end --while
 if turtle.getSelectedSlot() == blockSlot then
  checkBlocks()
 end --if
 return true
end --function


function placeUp()
 local x = flex.getBlockUp()
 local t = os.time()
 while not turtle.placeUp()
       and flex.isBlockUp(options["fluids"]) do
  if attack then
   turtle.attack()
   turtle.attackUp()
  end --if

  if (os.time()-t)/24*20*60 > 20 then
   flex.send("#1Edge of world detected#0: {#8"..
     tostring(getx()).."#0,#8"..
     tostring(gety()+1).."#0,#8"..
     tostring(getz()).."#0}")
   knownBedrock[#knownBedrock+1] = {
     getx(), gety()+1, getz() }

   stuck = true
   stuckDir = "up"
   return false
  end --if

  sleep(0.1)
  x = flex.getBlockUp()
 end --while
 if turtle.getSelectedSlot == blockSlot then
  checkBlocks()
 end --if
 return true
end --function


function placeDown()
 local x = flex.getBlockDown()
 local t = os.time()
 while not turtle.placeDown()
       and flex.isBlockDown(options["fluids"]) do
  if attack then
   turtle.attack()
   turtle.attackDown()
  end --if

  if (os.time()-t)/24*20*60 > 20 then
   flex.send("#1Edge of world detected#0: {#8"..
     tostring(getx()).."#0,#8"..
     tostring(gety()-1).."#0,#8"..
     tostring(getz()).."#0}")
   knownBedrock[#knownBedrock+1] = {
     getx(), gety()-1, getz() }
   up()
   placeDown()
   ymin = gety()

   stuck = true
   stuckDir = "down"
   return false
  end --if

  sleep(0.1)
  x = flex.getBlockDown()
 end --while
 if turtle.getSelectedSlot() == blockSlot then
  checkBlocks()
 end --if
 return true
end --function




----------------------------
--  /¯¯]  /¯\  [¯¯]  /¯\  --
-- | [¯| | O |  ||  | O | --
--  \__|  \_/   ||   \_/  --
----------------------------


function gotor(r)
 if r == nil then
  error("Number expected, got nil", 2)
  return
 end --if
 local x = (r-rdist)%360
 -- X is the target direction relative to current rotation

 if x == 90 then
  right()
 elseif x == 180 then
  left(rlast*2)
  -- Rotate opposite to last rotation
 elseif x == 270 then
  left()
 elseif x ~= 0 then
  error("Invalid rotation parameter", 2)
  return false
 end --if/else

 return true
end --function



function gotoy(y)
 if y == nil then
  error("Number expected, got nil", 2)
  return
 end --if

 while ydist < y do
  if not up() then return false end
 end
 while ydist > y do
  if not down() then return false end
 end
 return true
end


function gotox(x)
 if x == nil then
  error("Number expected, got nil", 2)
  return
 end --if

 if xdist < x then
  if rdist == 270 then
   return back(x-xdist)

  else
   gotor(90)
   return fwd(x-xdist)
  end
 end

 if xdist > x then
  if rdist == 90 then
   return back(xdist-x)

  else
   gotor(270)
   return fwd(xdist-x)
  end
 end

 return true
end


function gotoz(z)
 if z == nil then
  error("Number expected, got nil", 2)
  return
 end --if

 if zdist < z then
  if rdist == 180 then
   return back(z-zdist)

  else
   gotor(0)
   return fwd(z-zdist)
  end
 end

 if zdist > z then
  if rdist == 0 then
   return back(zdist-z)

  else
   gotor(180)
   return fwd(zdist-z)
  end
 end

 return true
end


function goto(x,y,z,r,lm)
 if type(x) == "table" then
  if #x < 4 then
   error("Invalid Goto Table",2)
  end
  y = x[2]
  z = x[3]
  r = x[4]
  lm = x[15]
  x = x[1]
 end
 gotox(x or 0)
 gotoz(z or 0)
 gotor(r or 0)
 gotoy(y or 0)
 if lm~=nil then setlast(lm) end
end




---------------------------------------
-- |¯¯]|| |||¯¯]||    |¯\|¯\ /¯\     --
-- | ] ||_||| ] ||_   | /| /| O | == --
-- ||   \__||__]|__]  || | \ \_/     --
---------------------------------------
--   /¯]|¯¯]/¯¯\/¯¯\[¯¯]|\ || /¯¯]   --
--  | [ | ] \_¯\\_¯\ ][ | \ || [¯|   --
--   \_]|__]\__/\__/[__]|| \| \__|   --
---------------------------------------

fuelSlot = {1,16}

function getFuelSlot()
 return fuelSlot[1],fuelSlot[2]
end --function

function setFuelSlot(a,b)
 if a == nil then
  return false
 end --if
 b = b or a
 if a < b then
  fuelSlot = {a,b}
 else
  fuelSlot = {b,a}
 end --if/else
 return true
end --function



function refuel(b)
 b = b or 1
 b = math.min(b, turtle.getFuelLimit())
 local a,x,z,slot
 slot = turtle.getSelectedSlot()
 a = true

 while turtle.getFuelLevel() < b do
  for x=fuelSlot[1],fuelSlot[2] do
   turtle.select(x)
   if turtle.refuel(1) then break end
   if x == fuelSlot[2] and a then
    if fuelSlot[1] == fuelSlot[2] then
        flex.send("Waiting for fuel in "..
          "slot "..tostring(fuelSlot[1])..
          "...", colors.pink)
    else
     flex.send("Waiting for fuel in "..
       "slots "..tostring(fuelSlot[1])..
       "-"..tostring(fuelSlot[2])..
       "...", colors.pink)
    end --if/else
    a = false
   end --if
  end --for
 end --while

 if not a then
  flex.send("Thanks!",colors.lime)
 end --if
 turtle.select(slot)

end --function




local fuelvalue = {}
local fuelfile = "dig_fuel.cfg"
local file, line
if fs.exists(fuelfile) then
 file = fs.open(fuelfile, "r")
 line = file.readLine()
 while line ~= nil do
  fuelvalue[line] = tonumber(file.readLine())
  line = file.readLine()
 end --while
 file.close()
else
 file = fs.open(fuelfile, "w")
 file.close()
end --if/else


function checkFuelValue(x)
 if type(x) ~= "number" then
  local x = turtle.getSelectedSlot()
 end --if
 if turtle.getItemCount(x) == 0 then
  return 0
 end --if

 local a,b,c,d
 a = turtle.getItemDetail(x)["name"]
 b = fuelvalue[a]

 if b == nil then
  c = turtle.getFuelLevel()
  turtle.select(x)
  turtle.refuel(1)
  d = turtle.getFuelLevel() - c
  fuelvalue[a] = d

  file = fs.open(fuelfile, "a")
  file.writeLine(a)
  file.writeLine(tostring(d))
  file.close()

  if turtle.getItemCount(x) == 0 then
   return 0
  else
   return d
  end --if
 end --if

 return b
end --function




blockSlot = 0
blockStacks = 1
function getBlockSlot() return blockSlot end
function setBlockSlot(n) blockSlot = n end
function getBlockStacks() return blockStacks end
function setBlockStacks(n) blockStacks = n end


function checkBlocks()
 if blockSlot == 0 then return end
 local x,docondense

 if not flex.isItem(options["buildingblocks"],blockSlot) then
  if turtle.getItemCount(blockSlot) > 0 then
   for x=blockSlot+1,16 do
    if turtle.getItemCount(x) == 0 then
     turtle.select(blockSlot)
     turtle.transferTo(x)
     break
    end --if
   end --for
  end --if
 end --if

 if turtle.getItemCount(blockSlot) == 0 then
  for x=1,16 do
   if flex.isItem(options["buildingblocks"],x) then
    turtle.select(x)
    turtle.transferTo(blockSlot)
    turtle.select(blockSlot)
    break
   end --if
  end --for
 flex.condense(blockSlot)
 end --if

 turtle.select(blockSlot)
end --function



function blockLava(dir)
 if not flex.isBlock("lava",dir) then
  return
 end --if
 local slot = turtle.getSelectedSlot()
 checkBlocks()
 turtle.select(blockSlot)
 if dir == "up" then
  turtle.placeUp()
 elseif dir == "down" then
  turtle.placeDown()
 else
  turtle.place()
 end --if/else
 turtle.select(slot)
end --function

function blockLavaUp() blockLava("up") end
function blockLavaDown() blockLava("down") end




-- Organize Inventory/Fuel
--   C
--  CTQQQ
--   QQQQ
-- (Chest/Turtle/Quarry)

function dropNotFuel()

 local slot = turtle.getSelectedSlot()
 local a,b,c,f,x,y,z
 local crafty,usedbucketalready,blocksPresent
 turtle.select(1)
 if turtle.getItemCount(1) > 1 then
  flex.condense()
 end --if

 -- Check there's inventory to place loot
 a = true
 while true do
  if isChest() then
   break
  end
  if a then
   flex.send("Output inventory not found!",
     colors.red)
   a = false
  end --if
  sleep(1)
 end --while
 if not a then
  flex.send("Thanks!",colors.lightBlue)
 end --if


 -- Drop off what's not fuel
 blocksPresent = blockStacks
 for x=1,16 do
  turtle.select(x)
  if not turtle.refuel(0) then
   if flex.isItem(options["buildingblocks"]) then
    if blocksPresent <= 0 then
     turtle.drop()
    else
     blocksPresent = blocksPresent - 1
    end --if/else
   else
    turtle.drop()
   end --if/else
  end --if
 end --for
 checkBlocks()
 turtle.select(1)
 -- Retrieve surplus fuel from fuel chest
 while turtle.suckUp() do sleep(0) end
 if turtle.getItemCount(fuelSlot[1]) > 0 then
  flex.condense()
 end --if


 -- Craft coal into blocks
 if peripheral.find("workbench") and isChestUp() then

  z = 0
  for x=1,16 do
   if turtle.getItemCount(x) > 0 and
      turtle.getItemDetail(x)["name"]
      ~= "minecraft:coal" then
    turtle.select(x)
    turtle.dropUp()
   end --if
   z = z + turtle.getItemCount(x)
  end --for

  if z >= 9 then

   y = 13
   for x=1,12 do
    turtle.select(x)
    while turtle.getItemCount(x) > 0 do
     if y <= 16 then
      turtle.transferTo(y)
     else
      z = z - turtle.getItemCount(x)
      turtle.dropUp()
     end --if/else
     if turtle.getItemCount(x) > 0 then
      y = y + 1
     end --if
    end --while
   end --for

   y = math.floor(z/9)
   turtle.select(13)
   turtle.dropUp(z%9)
   a = 13
   b = { 1, 2, 3, 5, 6, 7, 9, 10, 11 }
   for x=1,#b do
    if turtle.getItemCount(a) < y then
     turtle.select(a+1)
     turtle.transferTo(a,
       y - turtle.getItemCount(a))
    end --if
    turtle.select(a)
    turtle.transferTo(b[x], y)
    if turtle.getItemCount(a) == 0 then
     a = a + 1
    end --if
   end --for

   if peripheral.getType("left") == "workbench" then
    crafty = peripheral.wrap("left")
   else
    crafty = peripheral.wrap("right")
   end --if/else
   turtle.select(1)
   crafty.craft()

  end --if
  while turtle.suckUp() do sleep(0) end
  checkBlocks()

 end --if


 --Tally up fuel sources
 z = {} -- slot #
 f = {} -- amount of fuel
 usedbucketalready = false

 for x=1,16 do
  turtle.select(x)

  if turtle.refuel(0) then
   y = turtle.getItemCount()

   if flex.isItem("bucket") and y==1 then
    if not usedbucketalready then
     -- Only use buckets one at a time
     turtle.refuel()
     usedbucketalready = true
     turtle.drop()
    end

   else -- Not a bucket
    a = checkFuelValue(x)
    if a > 0 then
     z[#z+1] = x
     f[#z] = a*turtle.getItemCount(x)
    end --if

   end --if/else (is bucket)

  end --if (is fuel)
 end --for (slots)


 -- Choose best fuel available
 a = 0
 for x=1, #f do
  a = math.max(a,f[x])
 end --for
 for x=1, #f do
  if f[x] == a then
   if z[x] > 1 then
    for b=2,16 do
     if turtle.getItemCount(b) == 0 then
      turtle.select(1)
      turtle.transferTo(b)
      break
     end --if
    end --for
    turtle.select(z[x])
    turtle.transferTo(1)
   end --if
   break
  end --if
 end --for


 -- Deposit surplus fuel
 for x=fuelSlot[1]+1,16 do
  if turtle.getItemCount(x) > 0 then

   turtle.select(x)
   if turtle.refuel(0) then
    if isChestUp() then
     -- Place in fuel chest
     turtle.dropUp()
    end --if
    if turtle.getItemCount() > 0 then
     -- Fuel chest is full or absent
     turtle.drop()
    end --if
   end --if

  end --if (more than zero items)
 end --for (all slots after fuel slot)

 turtle.select(fuelSlot[1])
 if not turtle.refuel(0) then
  for x=fuelSlot[1]+1,16 do
   turtle.transferTo(x)
   if turtle.getItemCount() == 0 then
    break
   end --if
  end --for
 end --if

 flex.condense(fuelSlot[1]+1)

 if turtle.getItemCount(16) > 0 then
  flex.send("Inventory full!",colors.red)
  turtle.select(16)
  while not turtle.drop() do sleep(5) end
  flex.send("Inventory has room!",colors.lightBlue)
  turtle.select(slot)
  return dropNotFuel()
 end --if

 turtle.select(slot)

end --function dropNotFuel()