From 3c5a5bc87cccf5d4a99f155e449bbb7a98c4262f Mon Sep 17 00:00:00 2001
From: Daniel Silverstone <dsilvers@digital-scurf.org>
Date: Sat, 8 Sep 2012 14:13:00 +0100
Subject: GALL.UTIL: Start to test deep_copy

---
 Makefile                |  2 +-
 lib/gall/util.lua       |  5 +--
 test/test-gall.util.lua | 91 +++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 95 insertions(+), 3 deletions(-)
 create mode 100644 test/test-gall.util.lua

diff --git a/Makefile b/Makefile
index 1ac9023..71479f2 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 all: test
 
-MODULES := gall
+MODULES := gall gall.util
 LUA_VER := 5.1
 
 INST_BASE := /usr/local
diff --git a/lib/gall/util.lua b/lib/gall/util.lua
index d6c5297..48181be 100644
--- a/lib/gall/util.lua
+++ b/lib/gall/util.lua
@@ -10,14 +10,15 @@ local function deep_copy(t, memo)
    if not memo then memo = {} end
    if memo[t] then return memo[t] end
    local ret = {}
+   memo[t] = ret
    local kk, vv
    for k, v in pairs(t) do
       kk, vv = k, v
       if type(k) == "table" then
-	 kk = _deep_copy(k)
+	 kk = deep_copy(k, memo)
       end
       if type(v) == "table" then
-	 vv = _deep_copy(v)
+	 vv = deep_copy(v, memo)
       end
       ret[kk] = vv
    end
diff --git a/test/test-gall.util.lua b/test/test-gall.util.lua
new file mode 100644
index 0000000..908e114
--- /dev/null
+++ b/test/test-gall.util.lua
@@ -0,0 +1,91 @@
+-- test/test-gall.util.lua
+--
+-- Git Abstraction layer for Lua - Utility function tests
+--
+-- Copyright 2012 Daniel Silverstone <dsilvers@digital-scurf.org>
+--
+-- For Licence terms, see COPYING
+--
+
+-- Step one, start coverage
+
+local luacov = require 'luacov'
+
+local util = require 'gall.util'
+
+local testnames = {}
+
+local real_assert = assert
+local total_asserts = 0
+local function assert(...)
+   local retval = real_assert(...)
+   total_asserts = total_asserts + 1
+   return retval
+end
+
+local function add_test(suite, name, value)
+   rawset(suite, name, value)
+   testnames[#testnames+1] = name
+end
+
+local suite = setmetatable({}, {__newindex = add_test})
+
+function suite.test_deep_copy_simple()
+   local intab = { "a", "b" }
+   local outtab = util.deep_copy(intab)
+   assert(intab ~= outtab)
+   assert(outtab[1] == "a")
+   assert(outtab[2] == "b")
+end
+
+function suite.test_deep_copy_recurse()
+   local intab = { { "a" } }
+   local outtab = util.deep_copy(intab)
+   assert(intab ~= outtab)
+   assert(intab[1] ~= outtab[1])
+   assert(outtab[1][1] == "a")
+end
+
+function suite.test_deep_copy_recurse_key()
+   local intab = { [{"a"}] = {"b"} }
+   local outtab = util.deep_copy(intab)
+   assert(intab ~= outtab)
+   local inkey, inval = next(intab)
+   local outkey, outval = next(outtab)
+   assert(inkey ~= outkey)
+   assert(outkey[1] == "a")
+   assert(inval ~= outval)
+   assert(outval[1] == "b")
+end
+
+function suite.test_deep_copy_memo()
+   local intab = { a = {} }
+   intab.b = intab.a
+   local outtab = util.deep_copy(intab)
+   assert(intab ~= outtab)
+   assert(outtab.a == outtab.b)
+end
+
+function suite.test_deep_copy_memo_loop()
+   local intab = {}
+   intab.a = intab
+   local outtab = util.deep_copy(intab)
+   assert(intab ~= outtab)
+   assert(outtab == outtab.a)
+end
+
+local count_ok = 0
+for _, testname in ipairs(testnames) do
+--   print("Run: " .. testname)
+   local ok, err = xpcall(suite[testname], debug.traceback)
+   if not ok then
+      print(err)
+      print()
+   else
+      count_ok = count_ok + 1
+   end
+end
+
+print(tostring(count_ok) .. "/" .. tostring(#testnames) .. " [" .. tostring(total_asserts) .. "] OK")
+
+os.exit(count_ok == #testnames and 0 or 1)
-- 
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