From 11cc95c3e06028027a31bad9ef867df542bb93ac Mon Sep 17 00:00:00 2001
From: ac-minetest <rndgit@yandex.com>
Date: Fri, 27 Nov 2020 17:19:17 +0100
Subject: [PATCH] robot fixes: boost move, books

---
 basic_robot/commands.lua | 9 +++++----
 basic_robot/init.lua     | 4 ++--
 basic_robot/robogui.lua  | 4 ++--
 3 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/basic_robot/commands.lua b/basic_robot/commands.lua
index 7ee45ad..7ff9b61 100644
--- a/basic_robot/commands.lua
+++ b/basic_robot/commands.lua
@@ -444,8 +444,9 @@ basic_robot.commands.write_book = function(name,title,text) -- returns itemstack
 	local data = {} 
 	
 	if title == "" or not title then title = "program book "..minetest.get_gametime() end
-	data.title = title or ""
-	data.text = text or ""
+	if text == "" or not text then text = "empty" end
+	data.text = text
+	data.title = title
 	data.text_len = #data.text
 	data.page = 1
 	data.description = title or ""
@@ -747,7 +748,7 @@ basic_robot.commands.craftcache = {};
 
 basic_robot.commands.craft = function(item, mode, idx,amount, name)
 	amount = amount and tonumber(amount) or 1;
-	if amount<1 then amount = 1 end
+	if amount<0 then amount = 1 end
 	if not item then return false end
 
 	
@@ -1152,7 +1153,7 @@ basic_robot.commands.machine = {
 		
 		
 		energy = data.menergy or 0;
-		if amount>energy then return nil,"energy too low" end
+		if amount>energy or amount<0 then return nil,"energy too low" end
 		
 		if not tdata.menergy then tdata.menergy = 0 end
 		tdata.menergy = tdata.menergy + amount
diff --git a/basic_robot/init.lua b/basic_robot/init.lua
index 2b5b0b8..6352e2d 100644
--- a/basic_robot/init.lua
+++ b/basic_robot/init.lua
@@ -26,7 +26,7 @@ basic_robot.bad_inventory_blocks = { -- disallow taking from these nodes invento
 
 basic_robot.http_api = minetest.request_http_api(); 
 
-basic_robot.version = "2020/10/14a";
+basic_robot.version = "2020/11/27a";
 
 basic_robot.gui = {}; local robogui = basic_robot.gui -- gui management
 basic_robot.data = {}; -- stores all robot related data
@@ -74,7 +74,7 @@ function getSandboxEnv (name)
 				return
 			end
 			local yaw = obj:get_yaw();
-			obj:set_velocity({x=v*math.cos(yaw),y=0,z=v*math.sin(yaw)});
+			obj:set_velocity({x=-v*math.sin(yaw),y=0,z=v*math.cos(yaw)});
 		end,
 		
 		turn = {
diff --git a/basic_robot/robogui.lua b/basic_robot/robogui.lua
index cdaf651..6c236b4 100644
--- a/basic_robot/robogui.lua
+++ b/basic_robot/robogui.lua
@@ -172,8 +172,8 @@ local help_pages = {
 		"  activate.direction(mode) activates target block",
 		"  pickup(r) picks up all items around robot in radius r<8 and returns list",
 		"    or nil",
-		"  craft(item,idx,mode,amount) crafts item if required materials are present in",
-		"    inventory, mode = 1 returns recipe, optional recipe idx, optional ammount",
+		"  craft(item,idx,mode) crafts item if required materials are present in",
+		"    inventory, mode = 1 returns recipe, optional recipe idx",
 		"  take.direction(item, inventory) takes item from target inventory into",
 		" robot inventory",
 	},