craft

itemList={} --table of item locations, you'll want to edit this to fit your layout
itemList[1]={glass=1 , sandstone2=2 , sandstone3=3 , sapling=4 , sapling2=5 , sapling3=6 , sapling4=7 , obsidian=8 }
itemList[2]={flint=1 ,coal=2 ,reed=3 ,stick=4 ,cactus=5 ,glowstone=6 ,netherack=7 ,soulsand=8 }
itemList[3]={saltpeter=1 ,sulfur=2 ,copper=3 ,tin=4 ,apatite=5 ,netherbrick=6 ,gold=7 ,grassblock=8 }
itemList[4]={charcoal=1 ,emerald=2 ,stonebrick=3 ,mossystonebrick=4 ,crackedstonebrick=5 ,stone=6 ,mossycobble=7 ,woodenplanks=8 }
itemList[5]={wood=1 ,iron=2 ,sand=3 ,gravel=4 ,sandstone=5 ,redstone=6 ,diamond=7 ,lapis=8 }
itemList[6]={wood2=1 ,wood3=2 ,wood4=3 ,woodenplanks4=4 ,woodenplanks3=5 ,woodenplanks2=6 ,dirt=7 ,cobble=8 }

Recipe={ --these are the recipes, add your own using this formula, where the number is slot number. If a slot should be empty, use "air"
    furnace = {
        [1] = "cobble" ,
        [2] = "cobble" ,
        [3] = "cobble" ,
        [5] = "cobble" ,
        [6] = "air" ,
        [7] = "cobble" ,
        [9] = "cobble" ,
        [10] = "cobble" ,
        [11] = "cobble"
    },
    diamond_pick = {
        [1] = "diamond" ,
        [2] = "diamond" ,
        [3] = "diamond" ,
        [5] = "air" ,
        [6] = "stick" ,
        [7] = "air" ,
        [9] = "air" ,
        [10] = "stick" ,
        [11] = "air"
    },
    piston = {
        [1] = "woodenplanks" ,
        [2] = "woodenplanks" ,
        [3] = "woodenplanks" ,
        [5] = "cobble" ,
        [6] = "iron" ,
        [7] = "cobble" ,
        [9] = "cobble" ,
        [10] = "redstone" ,
        [11] = "cobble"
    },
    chest = {
        [1] = "woodenplanks" ,
        [2] = "woodenplanks" ,
        [3] = "woodenplanks" ,
        [5] = "woodenplanks" ,
        [6] = "air" ,
        [7] = "woodenplanks" ,
        [9] = "woodenplanks" ,
        [10] = "woodenplanks" ,
        [11] = "woodenplanks"
    },
    iron_pick = { --no spaces!
        [1] = "iron" ,
        [2] = "iron" ,
        [3] = "iron" ,
        [5] = "air" ,
        [6] = "stick" ,
        [7] = "air" ,
        [9] = "air" ,
        [10] = "stick" ,
        [11] = "air"
    },
    stone_pick = {
        [1] = "cobble" ,
        [2] = "cobble" ,
        [3] = "cobble" ,
        [5] = "air" ,
        [6] = "stick" ,
        [7] = "air" ,
        [9] = "air" ,
        [10] = "stick" ,
        [11] = "air"
    },
    torch = {
        [1] = "air" ,
        [2] = "air" ,
        [3] = "air" ,
        [5] = "air" ,
        [6] = "coal" ,
        [7] = "air" ,
        [9] = "air" ,
        [10] = "stick" ,
        [11] = "air"
    }
}

local args={ ... } --gets and sets inputs
local input=args[1]
local amount=args[2] --might not use
if amount==nil then --defaults to 1 if no number entered (you can change if you want)
    amount=1
    print("No amount given. Defaulting to "..amount)
end

local xpos=8 --sets default position
local ypos=6
turtle.forward() --gets in place
turtle.forward()
turtle.turnRight()

function GoTo(items) --goes to items location
    if items~=nil then
        for i=1,6 do
            if itemList[i][items]~=nil then --sets x and y depending on the item inputted
                x=itemList[i][items]
                y=i
            end
        end
        if x==nil then x=xpos end --these make it so the turtle will stay put if it doesn't understand
        if y==nil then y=ypos end
        turtle.turnRight()
        while x>xpos do --these loops will get the turtle to the right location
            turtle.forward()
            xpos=xpos+1
        end
        while xpos>x do
            turtle.back()
            xpos=xpos-1
        end
        while ypos>y do
            turtle.up()
            ypos=ypos-1
        end
        while y>ypos do
            turtle.down()
            ypos=ypos+1
        end
        turtle.turnLeft()
    end
end

function Retrieve(x) --grabs the correct amount of items
    turtle.suck()
    if turtle.getItemCount(x)-amount <=0 then
        turtle.suck()
    end
    turtle.drop(turtle.getItemCount(x)-amount)
end

function Decode() --does the work
    for i=1,3 do --goes through each slot and grabs neccisary items
        if Recipe[input][i] ~="air" then
            turtle.select(i)
            GoTo(Recipe[input][i])
            Retrieve(i)
        end
    end
    for i=5,7 do
        if Recipe[input][i] ~="air" then
            turtle.select(i)
            GoTo(Recipe[input][i])
            Retrieve(i)
        end
    end
    for i=9,11 do
        if Recipe[input][i] ~="air" then
            turtle.select(i)
            GoTo(Recipe[input][i])
            Retrieve(i)
        end
    end
end

Decode()
turtle.craft()

GoTo("cobble") --goes back to beginning and drops left
turtle.turnLeft()
turtle.back()
turtle.back()
turtle.turnLeft()
turtle.drop()
turtle.turnRight()