package manager + tweaks to milo

farms/cows.lua

@@ -93,7 +93,7 @@ end
 local chest = InventoryAdapter({ side = 'top', direction = 'down' }) or
     error('missing chest above')
 
-turtle.run(function()
+local s, m = turtle.run(function()
   turnOffWater()
 
   repeat
@@ -117,3 +117,7 @@ turtle.run(function()
     os.sleep(5)
   until turtle.isAborted()
 end)
+
+if not s and m then
+  error(m)
+end

farms/etc/apps/apps.db

@@ -0,0 +1,11 @@
+{
+	[ "8d1b0a73bedc0dc492377c2f6ab880940b97ec6e" ] = {
+		title = "Treefarm",
+		icon = "\030 \031f \0305 \030    \030d \030  \
+\0305\031f \030d  \030  \030d \0305 \030d \
+\030 \031f \030c \030  \0304 \030  \030c \030  ",
+		category = "Apps",
+		run = "treefarm.lua",
+		requires = "turtle",
+	},
+}

farms/farm.lua

@@ -106,7 +106,7 @@ local function harvest(blocks)
   turtle.equip('right', 'plethora:module:2')
 end
 
-turtle.run(function()
+local s, m = turtle.run(function()
   local facing = scanner.getBlockMeta(0, 0, 0).state.facing
   turtle.point.heading = Point.facings[facing].heading
 
@@ -125,3 +125,7 @@ turtle.run(function()
     end
   until turtle.isAborted()
 end)
+
+if not s and m then
+  error(m)
+end