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Add support of linenoise (replace readline)

see discussion, http://lua-users.org/lists/lua-l/2010-03/msg00879.html

Signed-off-by: Francois Perrad <francois.perrad@gadz.org>

Index: b/src/luaconf.h
===================================================================
--- a/src/luaconf.h
+++ b/src/luaconf.h
@@ -279,6 +279,13 @@
 	if (lua_strlen(L,idx) > 0)  /* non-empty line? */ \
 	  add_history(lua_tostring(L, idx));  /* add it to history */
 #define lua_freeline(L,b)	((void)L, free(b))
+#elif defined(LUA_USE_LINENOISE)
+#include <linenoise.h>
+#define lua_readline(L,b,p)	((void)L, ((b)=linenoise(p)) != NULL)
+#define lua_saveline(L,idx) \
+	if (lua_strlen(L,idx) > 0)  /* non-empty line? */ \
+	  linenoiseHistoryAdd(lua_tostring(L, idx));  /* add it to history */
+#define lua_freeline(L,b)	((void)L, free(b))
 #else
 #define lua_readline(L,b,p)	\
 	((void)L, fputs(p, stdout), fflush(stdout),  /* show prompt */ \