add rendering to hopefully make debugging easier

src/main.lua

@@ -306,12 +306,12 @@ local function center(direction, wanted)
 end
 local function moveto(x,y,cx,cz,direction)
     while x ~= cx or y ~= cz do
-        if x > cx then -- x
+        if cx < x then -- x
             center(direction)
             cx = cx + 1
             move("forward")
         end
-        if x < cx then
+        if cx > x then
             center(direction)
             cx = cx - 1
             move("back")
@@ -345,6 +345,26 @@ local function printdes(buf, dimensions)
             while true do
                 local target = getnearestunplaced(buf, pbuf, cx,cy,cz,nil, dimensions["x"],dimensions["z"], false)
                 if not target then break end
+
+                reset() -- render current work
+                for x=1,dimensions["x"],1 do
+                    for z=1,dimensions["z"],1 do
+                        local currentbuf = pbuf[posasstring(x, cy, z)]
+                        term.setCursorPos(x, z)
+                        if currentbuf then -- wall
+                            term.blit(" ", colors.toBlit(colors.white), colors.toBlit(colors.white))
+                        elseif currentbuf == false or currentbuf == nil then -- nothing
+                            term.blit("\127", colors.toBlit(colors.gray), colors.toBlit(colors.black))
+                        end
+                    end
+                end
+                term.setCursorPos(cx,cz)
+                term.blit(" ", colors.toBlit(colors.red), colors.toBlit(colors.red))
+                term.setCursorPos(target[1],target[2])
+                term.blit(" ", colors.toBlit(colors.lime), colors.toBlit(colors.lime))
+
+                read("")
+
                 cx,cz,direction = moveto(target[1],target[2],cx,cz,direction)
                 place("down")
                 pbuf[posasstring(cx,cy,cz)] = true