Keep it up. If this gets finished it will be awesome

@adriweb: Thanks for poiting to it, to be honest I haven't checked for updates in a long time . I just found this copy on my old harddrive, and used it I'm now using the updated version
[edit] it gives me an error: attempt to call method 'getStringWidth' (a nil value) nvm, it works now. Forgot to pass gc to it.

@Jim: Thanks, that fixed the problem! You really know pretty much everything about nspire lua it seems

We don't care about the graphical glitch , this is one really awesome program ! You sir have my full support on this

While working on a project I found myself in need of detecting whether the mouse was clicked inside a certain area or not. I thought it would be pretty simple since I only needed square 'hitboxes'. I wrote some simple code and figured to share it in case it might be useful to others.

Hitbox code:
Code for the hitbox:
HitBoxSquare = class()
function HitBoxSquare:init(xIn, yIn, width, height)
     self.x = xIn
     self.y = yIn
     self.width = width
     self.height = height
end

function HitBoxSquare:contains(xMouse, yMouse)
    local sw = self.width
    local sh = self.height
    return (xMouse>=(self.x)) and xMouse<=(self.x+sw) and yMouse>=(self.y) and yMouse<=(self.y+sh)
endMandatory code:
To track mousepresses:
function on.mouseDown(x, y)
    mouseX = x
    mouseY = y
    --Other code here
endTo track mousemovement:
function on.mouseMove(x, y)
    mouseX = x
    mouseY = y
    --Other code here
end
How to use:
Create the hitbox:
hitBox = HitBoxSquare(x, y, width, height)Check if the mouse is clicked inside the hitbox:
if hitBox:contains(mouseX, mouseY) then
    --Do something here
end
Using multiple hitboxes:
If you want to use more then one hitbox, checking them by hand is a little too much work. Here's where tables come in handy!
-----------------------------------------------
-- Checking multiple hitboxes, the fast way. --
-- ElementCoder, 2012                        --
-----------------------------------------------
HitBoxSquare = class()
function HitBoxSquare:init(xIn, yIn, width, height)
     self.x = xIn
     self.y = yIn
     self.width = width
     self.height = height
end

function HitBoxSquare:contains(xMouse, yMouse)
    local sw = self.width
    local sh = self.height
    return (xMouse>=(self.x)) and xMouse<=(self.x+sw) and yMouse>=(self.y) and yMouse<=(self.y+sh)
end

hb1 = HitBoxSquare(10, 10, 10, 10)
hb2 = HitBoxSquare(10, 25, 10, 10)
hb3 = HitBoxSquare(10, 40, 10, 10)
hitbox = {hb1, hb2, hb3}
hitboxname = {"Hitbox 1", "Hitbox 2", "Hitbox 3"}

function on.paint(gc)
    gc:drawRect(10, 10, 10, 10)
    gc:drawRect(10, 25, 10, 10)
    gc:drawRect(10, 40, 10, 10)
end

function on.mouseMove(x, y)
    mouseX, mouseY = x, y
    for i = 1, 3 do
        if hitbox[i]:contains(mouseX, mouseY) then
            print(hitboxname[i].." contains the mouse!")
        end
    end
end

the problem would likely be differentiating stuff like pumpkins/orange wool or snow/black wool.

snow and black wool?

That on a sidenote, I hope you will complete this project. It sounds awesome.

Don't you just zip up the rom and name it <filename>.zip.tns ?

This is definitely useful! Good job.

I started a similar project some time ago, with a crafting system (in TI-Nspire Basic it worked pretty neat)

Oh wow a TI-nspire Basic Minecraft Library! Good job!
With TI-nspire Basic, I can tell you some things.
Instead of having users type the whole argument blocks(), you can do something like this:
b.locks()
That way you only have to type b. and a menu will pop up (this may or may not be suitable)

Also about the library itself, Diamond ore said it was the rarest ore in the game, but your Emerald ore also says rarest ore in the game?
Only one of them can be the rarest, and here it would be diamond, because emeralds are renewable through trading (which you also didn't mention)

Keep going!

Emerald is still the rarest ORE in the game

Any way I could change the menu to make it more efficient?

I think it's quite at its most efficient point.
I'd recommend doing as Jonius7 said , have a b.<block name> style menu (and probably a b.search function too), same for items.
[edit]Stay tuned for my lua minecraft encyclopedia (with crafting system(!) and images!)