View difference between Paste ID: W2baCtuM and GmrMUexM

 --This is the classroom monitor setup routine
 --written by Matt Kelliher
 --
 
 --First: we assume there are 4 equal-sized
 --monitors in the room connected to the network
 --we'll find them on the network,
 --give them names based on color, and
 --wrap them with a variable
 local Rmon, Gmon, Bmon, Pmon = peripheral.find("monitor", function(name, object) return object.isColor() end)
 
 --We'll also get the dimensions of the monitors
 --and store them (we'll assume all monitors are
 --the same number of columns and rows)
 local monRows, monColumns
 
 --A useful function for centering text
 --on a monitor from the ComputerCraft forums
 function centerPrint(text, y, mon)
   local w, h = mon.getSize() or term.getSize()
   if mon then
     mon.setCursorPos( math.ceil( w/2 - #text/2 + 1), y )
     mon.write( text)
   else
     mon.setCursorPos( math.ceil( w/2 - #text/2 ), y )
     term.write( text )
   end
 end
 
 --A function that wraps text on monitor
 --and calls the center function
 function printCenterWrap( mon, text, size )
   --size is an optional parameter,
   --we default to 0.5
   if size == nil then size = 0.5 end
 
   if size > 0 then mon.setTextScale(size) end
 
   local MaxCols, MaxRows = mon.getSize()
   local stBuffer = text
   local rowCount = 1
 
   print("MaxCols: "..MaxCols.." MaxRows: "..MaxRows)
   while string.len(stBuffer) > 0 and rowCount <= MaxRows do
     --print("LoopStartBuffer: "..stBuffer.." ("..string.len(stBuffer)..")")
     --find if there's a space character
     local space = string.find(stBuffer, " ")
 
     if space == nil or space >= MaxCols then
       --print("found no space before EOL")
       --This is the easiest case: we didn't
       --find a space before the End-of-Line MaxCols
       --so just print a substring up to EOL
       mon.setCursorPos(1,rowCount) --center later
       --print("SetCursorPos(1,"..rowCount..")")
       local wl = string.sub(stBuffer,1,MaxCols)
       mon.write(wl) --center this later
       --print("Wrote:"..wl)
       if (MaxCols + 1) > (string.len(stBuffer)) then
         --we're don't processing
         stBuffer = ""
         --print("Set Buffer to EOL")
       else
         stBuffer = string.sub(stBuffer, MaxCols + 1)
         --print("Set Buffer to:"..stBuffer.." ("..string.len(stBuffer)..")")
       end
     else
       print("found space at: "..space)
       local sentence = ""
       local nextspace
       --loop to find the next space in the buffer
       local word = string.sub(stBuffer,1,space)
       print("Word: "..word)
       repeat
 
         sentence = sentence..word
         print("Sentence: "..sentence.." ("..string.len(sentence)..")")
         --test that we don't go past the end
         if (string.len(word)+1) > string.len(stBuffer) then
           stBuffer = ""
         else
           stBuffer = string.sub(stBuffer,string.len(word)+1)
         end
 
         nextspace = string.find(stBuffer, " ")
         if nextspace == nil then
           print("nextspacce: nil")
         else
           print("nextspace: "..nextspace)
         end
 
         word = string.sub(stBuffer,1,nextspace)
         print("nextword: "..word)
 
       until nextspace == nil or (string.len(sentence)+nextspace) >= MaxCols
 
       mon.setCursorPos(1, rowCount)
       print("SetCursorPos(1, "..rowCount..")")
       if nextspace == nil then
         mon.write(sentence..word)
         print("Wrote:"..sentence..word)
       else
         mon.write(sentence)
         print("Wrote:"..sentence)
       end
 
     end --of finding a space
 
     --increment row counter
     rowCount = rowCount + 1
   end --while for each row
 
 end
 --Have a Function to setup monitors where you
 --Input/Parameter the monitor object/variable
 --and the colors.color you want it to be
 function setupMonitor(mon, xcolor)
   mon.clear()
   mon.setTextScale(0.5)
   mon.setCursorPos(1,1)
   mon.setBackgroundColor(xcolor)
   mon.clear()
   mon.setCursorPos(1,1)
   --mon.write("Welcome to Beyond Minecraft 101!")
   --centerPrint("Welcome to Beyond Minecraft 101!", 1, mon)
   --printCenter(mon,"Welcome to Beyond Minecraft 101!")
   printCenterWrap(mon, "Welcome to Beyond Minecraft 101!")
 end
 
 
 --This is our main control function
 --to run the program
 function main()
   --Determine which of the 4 monitors we have
   --on our network and set them up accordingly
   if Rmon then
     setupMonitor(Rmon, colors.red)
     --now assign the size of the first monitor
     --to be the size of all monitors
     monCols, monRows = Rmon.getSize()
     --print("Connected Red Monitor, size: "..monCols.." columns "..monRows.." rows")
   end
   if Gmon then
     --setupMonitor(Gmon, colors.green)
     --print("Connected Green Monitor")
   end
   if Bmon then
     --setupMonitor(Bmon, colors.blue)
     --print("Connected Blue Monitor")
   end
   if Pmon then
     --setupMonitor(Pmon, colors.purple)
     --print("Connected Purple Monitor")
   end
 end
 
 
 --Now kick-off our main program:
 main()