Basic builder

build.lua

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+local robot = require('robot')
+local sides = require('sides')
+local nav = require('nav')
+local io = require('io')
+
+local filename, mode = ...
+
+if not filename or not mode then
+    print('Usage: build <filename> <corner|center>')
+    print('Top of the blueprint file will be where the robot is facing')
+    return 1
+end
+
+
+---Read file line by line and split lines to characters and parse numbers
+---@param f file*
+---@return table grid
+local function parse_file(f)
+    local grid = {}
+
+    local line = f:read("*l")
+
+    while line do
+        local index = 1
+        local row = {}
+        for c in string.gmatch(line, ".") do
+            if c ~= '.' and c ~= ' ' then
+                local n = tonumber(c)
+                if n then
+                    row[index] = n
+                else
+                    row[index] = 0
+                end
+            else
+                row[index] = 0
+            end
+
+            index = index + 1
+        end
+
+        grid[#grid + 1] = row
+
+        line = f:read("*l")
+    end
+
+    return grid
+end
+
+---Move the robot from the center of the grid to the top left corner
+---Begins facing "up" and ends facing "up"
+---@param grid table 2d array
+local function move_to_corner(grid)
+    local x = math.floor(#grid / 2)
+    nav.forward(x)
+    robot.turnLeft()
+    local z = math.floor(#(grid[1]) / 2)
+    nav.forward(z)
+    robot.turnRight()
+end
+
+---Move the robot from the bottom left corner of the grid to the center
+---Begins facing "up" and ends facing "up"
+---@param grid table 2d array
+local function move_back_to_center(grid)
+    local x = math.floor(#grid / 2)
+    nav.forward(x)
+    robot.turnRight()
+    local z = math.floor(#(grid[1]) / 2)
+    nav.forward(z)
+    robot.turnLeft()
+end
+
+---Move the robot from the bottom left corner of the grid to the center
+---Begins facing "up" and ends facing "up"
+---@param grid table 2d array
+local function move_back_to_top_corner(grid)
+    nav.forward(#grid - 1)
+end
+
+---Build the blueprint
+---Robot begins facing up
+---@param grid table 2d array
+local function build(grid)
+    robot.turnRight()
+    for _, row in ipairs(grid) do
+        for _, block in ipairs(row) do
+            if block ~= 0 then
+                robot.select(block)
+                robot.placeDown(sides.down)
+            end
+            nav.forward(1)
+        end
+        robot.turnRight()
+        nav.forward(1)
+        robot.turnRight()
+        nav.forward(#row)
+        robot.turnAround()
+    end
+    robot.turnLeft()
+    nav.forward()
+end
+
+
+local file = io.open(filename, 'r')
+
+if not file then
+    print('File not found')
+    return 2
+end
+
+local grid = parse_file(file)
+
+if mode == 'center' then
+    move_to_corner(grid)
+end
+
+build(grid)
+
+if mode == 'center' then
+    move_back_to_center(grid)
+else
+    move_back_to_top_corner(grid)
+end

nav.lua

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+local robot = require("robot")
+
+return {
+    forward = function(n)
+        if not n then n = 1 end
+        for _ = 1, n do
+            while not robot.forward() do end
+        end
+    end,
+    back = function(n)
+        if not n then n = 1 end
+        for _ = 1, n do
+            while not robot.back() do end
+        end
+    end,
+}