Folding build_tools back into the main repo for simplicity.

tools/build/scripts/util.lua

@@ -0,0 +1,50 @@
+-- Prints a table and all of its contents.
+function print_r(t)
+  local print_r_cache={}
+  local function sub_print_r(t, indent)
+    if (print_r_cache[tostring(t)]) then
+      print(indent.."*"..tostring(t))
+    else
+      print_r_cache[tostring(t)]=true
+      if (type(t)=="table") then
+        for pos,val in pairs(t) do
+          if (type(val)=="table") then
+            print(indent.."["..pos.."] => "..tostring(t).." {")
+            sub_print_r(val,indent..string.rep(" ",string.len(pos)+8))
+            print(indent..string.rep(" ",string.len(pos)+6).."}")
+          elseif (type(val)=="string") then
+            print(indent.."["..pos..'] => "'..val..'"')
+          else
+            print(indent.."["..pos.."] => "..tostring(val))
+          end
+        end
+      else
+        print(indent..tostring(t))
+      end
+    end
+  end
+  if (type(t)=="table") then
+    print(tostring(t).." {")
+    sub_print_r(t,"  ")
+    print("}")
+  else
+    sub_print_r(t,"  ")
+  end
+  print()
+end
+
+-- Merges two tables and returns the resulting table.
+function merge_tables(t1, t2)
+  local result = {}
+  for k,v in pairs(t1 or {}) do result[k] = v end
+  for k,v in pairs(t2 or {}) do result[k] = v end
+  return result
+end
+
+-- Merges to arrays and returns the resulting array.
+function merge_arrays(t1, t2)
+  local result = {}
+  for k,v in pairs(t1 or {}) do result[#result + 1] = v end
+  for k,v in pairs(t2 or {}) do result[#result + 1] = v end
+  return result
+end