6 replies to this topic

[BigSHinyToys]

I looking for advice on how to best implement word wrap around.
so this is the program so far It works ok but all the words are being cut off on the ends.
also any improvements i could make would be greatly appreciated.

http://pastebin.com/raw.php?i=YjXzaq35

[Wolvan]

Just add n between. That creates a new line

[BigSHinyToys]

the point is it will scale with the screens size while allowing it to be scrolled with up/down keys or else I would have just used print()

new line will not help.

Pictures showing scroll

Spoiler

[libraryaddict]

Spoiler

function write( sText )
    local w,h = term.getSize()        
    local x,y = term.getCursorPos()
    
    local nLinesPrinted = 0
    local function newLine()
        if y + 1 <= h then
            term.setCursorPos(1, y + 1)
        else
            term.scroll(1)
            term.setCursorPos(1, h)
        end
        x, y = term.getCursorPos()
        nLinesPrinted = nLinesPrinted + 1
    end
    
    -- Print the line with proper word wrapping
    while string.len(sText) > 0 do
        local whitespace = string.match( sText, "^[ t]+" )
        if whitespace then
            -- Print whitespace
            term.write( whitespace )
            x,y = term.getCursorPos()
            sText = string.sub( sText, string.len(whitespace) + 1 )
        end
        
        local newline = string.match( sText, "^n" )
        if newline then
            -- Print newlines
            newLine()
            sText = string.sub( sText, 2 )
        end
        
        local text = string.match( sText, "^[^ tn]+" )
        if text then
            sText = string.sub( sText, string.len(text) + 1 )
            if string.len(text) > w then
                -- Print a multiline word                
                while string.len( text ) > 0 do
                if x > w then
                    newLine()
                end
                    term.write( text )
                    text = string.sub( text, (w-x) + 2 )
                    x,y = term.getCursorPos()
                end
            else
                -- Print a word normally
                if x + string.len(text) > w then
                    newLine()
                end
                term.write( text )
                x,y = term.getCursorPos()
            end
        end
    end
    
    return nLinesPrinted
end

Thats write function with proper word wrapping.

Its found in bios.lua.

You can look at how its does it then modify your own code with code from that />

[BigSHinyToys]

libraryaddict, on 20 April 2012 - 11:33 AM, said:

Spoiler

function write( sText )
	local w,h = term.getSize()		
	local x,y = term.getCursorPos()
	
	local nLinesPrinted = 0
	local function newLine()
		if y + 1 <= h then
			term.setCursorPos(1, y + 1)
		else
			term.scroll(1)
			term.setCursorPos(1, h)
		end
		x, y = term.getCursorPos()
		nLinesPrinted = nLinesPrinted + 1
	end
	
	-- Print the line with proper word wrapping
	while string.len(sText) > 0 do
		local whitespace = string.match( sText, "^[ t]+" )
		if whitespace then
			-- Print whitespace
			term.write( whitespace )
			x,y = term.getCursorPos()
			sText = string.sub( sText, string.len(whitespace) + 1 )
		end
		
		local newline = string.match( sText, "^n" )
		if newline then
			-- Print newlines
			newLine()
			sText = string.sub( sText, 2 )
		end
		
		local text = string.match( sText, "^[^ tn]+" )
		if text then
			sText = string.sub( sText, string.len(text) + 1 )
			if string.len(text) > w then
				-- Print a multiline word				
				while string.len( text ) > 0 do
				if x > w then
					newLine()
				end
					term.write( text )
					text = string.sub( text, (w-x) + 2 )
					x,y = term.getCursorPos()
				end
			else
				-- Print a word normally
				if x + string.len(text) > w then
					newLine()
				end
				term.write( text )
				x,y = term.getCursorPos()
			end
		end
	end
	
	return nLinesPrinted
end

Thats write function with proper word wrapping.

Its found in bios.lua.

You can look at how its does it then modify your own code with code from that />

i will look into that

Thanks it looks like it will be able to do what i want it to. after a few modifications

[Wolvan]

OK Good to hear that you managed it. And you can place functions IN functions?!?

[Hawk777]

Wolvan: Lua functions are first-class. A function actually doesn't have a name inherently; it's just a value which can be assigned to a name. This:

function f()
  …
end

is actually equivalent to this:

f = function()
  …
end

and you can also (as you discovered) create functions inside other functions, assign them into variables, pass them as parameters, return them from function calls, use them as values in tables, and so on. Basically everything from "function()" to "end" is a single giant expression.