CODEWITHSUNDEEP
luanullcomputercraft
Kev30
Kev30

Reputation: 119

Lua attempt to call nil

So I have this Lua script :

function dispTanks()
    mon.setCursorPos(offsetPos, 1)
    mon2.setCursorPos(offsetPos,1)

    for i=1, #machines do   -- RC Tanks
        --------------------------------------------
        if string.find(machines[i], "rcirontankvalvetile")
           or
           string.find(machines[i], "rcsteeltankvalvetile") then                        
            if peripheral.isPresent(machines[i]) then
                periph = peripheral.wrap(machines[i])

                fluidRaw, fluidName, fluidAmount, fluidCapacity, fluidID = marik.getTank(periph)                            

                if fluidName == nil then
                    -- does not display empty tanks
                elseif fluidName ~= nil then
                    mon2.setTextColor(tc)
                    x,y = mon2.getCursorPos()
                        mon2.setCursorPos(offsetPos, (y+1))
                        mon2.clearLine()
                    -- marik.cString(offsetPos,(y+1), tc, right, " ")
                    nameFL = split(marik.comma(fluidName), " ")
                    nameFL = nameFL[0]
                    mon2.write("Tank (" .. nameFL .. ") :  " .. marik.getBuckets(fluidAmount) .. " buckets") 
                end
             end
         end
     end
end

Now it gives a error at this line :

nameFL = split(marik.comma(fluidName), " ")

The error is: attempt to call nil.

Now, I am a beginner in Lua and this isn't my script but a free to use script and I have no idea how to fix this.

EDIT

So before I added the split section this was the result the script should give :

enter image description here

The problem was I wanted to change the names ( ardite.molten ) to Ardite and a friend said I needed to use split, so I added the following :

function firstToUpper(str)
    return (str:gsub("^%l", string.upper))
end

and 

nameFL = split(fluidName, " ")
nameFL = nameFL[0]

And changed : mon2.write("Tank (" .. marik.comma(fluidName) .. ") : " .. marik.comma(fluidAmount) .. " / " .. marik.comma(fluidCapacity) .. " mb (" .. marik.getBuckets(fluidAmount) .. " buckets)") to : mon2.write("Tank (" .. nameFL .. ") : " .. marik.getBuckets(fluidAmount) .. " buckets")

which gives me the error :http://puu.sh/a51QI/a848facf1b.png

Upvotes: 2

Views: 3498

Answers (2)

Ivo
Ivo

Reputation: 23257

Either the split function does not exist or the comma function of marik

EDIT:

What I think what you try to do is get everything before the dot instead of the full name right?

In that case you can do this:

replace these lines

nameFL = split(marik.comma(fluidName), " ")
nameFL = nameFL[0]

with this:

nameFL = marik.comma(fluidName):match("[^.]*")

You don't need a split for this. what this does is pattern matching and in this case it matches to everything until the first dot

Upvotes: 4

Cereal
Cereal

Reputation: 3849

I don't believe lua has a built in split function, and it needs to be defined yourself. Since you say you got this script from an external source, they may have defined it elsewhere.

Try reading this page for some ideas: http://lua-users.org/wiki/SplitJoin

If split is indeed defined, then the only other possibility is that the comma function is undefined, in which case you would need to define it inside marik.

Upvotes: 3

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