From 183e984d90e1546619e32aa1432689262a1fb964 Mon Sep 17 00:00:00 2001
From: Natanael Copa <ncopa@alpinelinux.org>
Date: Fri, 15 Oct 2010 06:44:23 +0000
Subject: support passing options to init

Either as:
  handle = augeas.init(root, loadpath, augeas.save_backup + augeas.no_load)

or:
  flags = {}
  flags.root = "/path/to/root"
  flags.loadpath = "/path/to/lenses"
  flags.save_backup = true
  flags.no_load = true
  handle = augeas.init(flags)
---
 laugeas.c | 62 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 61 insertions(+), 1 deletion(-)

diff --git a/laugeas.c b/laugeas.c
index 5195da2..db1b6d7 100644
--- a/laugeas.c
+++ b/laugeas.c
@@ -11,14 +11,65 @@
 #define VERSION "unknown"
 #endif
 
+struct aug_flagmap {
+	const char *name;
+	int value;
+};
+
+struct aug_flagmap Taug_flagmap[] = {
+	{ "none",		AUG_NONE },
+	{ "save_backup",	AUG_SAVE_BACKUP },
+	{ "save_newfile",	AUG_SAVE_NEWFILE },
+	{ "typecheck",		AUG_TYPE_CHECK },
+	{ "no_stdinc",		AUG_NO_STDINC },
+	{ "save_noop",		AUG_SAVE_NOOP },
+	{ "no_load",		AUG_NO_LOAD },
+	{ "no_modl_autoload",	AUG_NO_MODL_AUTOLOAD },
+	{ NULL, 0 }
+};
+
+static const char *get_opt_string_field(lua_State *L, int index,
+				        const char *key, const char *def)
+{
+	const char *value;
+	lua_getfield(L, index, key);
+	value = luaL_optstring(L, -1, def);
+	lua_pop(L, 1);
+	return value;
+}
+
+static int get_boolean_field(lua_State *L, int index, const char *key)
+{
+	int value;
+	lua_getfield(L, index, key);
+	value = lua_toboolean(L, -1);
+	lua_pop(L, 1);
+	return value;
+}
+
 static int Paug_init(lua_State *L)
 {
 	augeas **a;
+	struct aug_flagmap *f;
+	const char *root = NULL, *loadpath = NULL;
+	int flags = 0;
+
 	a = (augeas **) lua_newuserdata(L, sizeof(augeas *));
 	luaL_getmetatable(L, PAUG_META);
 	lua_setmetatable(L, -2);
 
-	*a = aug_init(NULL, NULL, 0);
+	if (lua_istable(L, 1)) {
+		root = get_opt_string_field(L, 1, "root", NULL);
+		loadpath = get_opt_string_field(L, 1, "loadpath", NULL);
+		for (f = Taug_flagmap; f->name != NULL; f++)
+			if (get_boolean_field(L, 1, f->name))
+				flags |= f->value;
+	} else {
+		root = luaL_optstring(L, 1, NULL);
+		loadpath = luaL_optstring(L, 2, NULL);
+		flags = luaL_optinteger(L, 3, AUG_NONE);
+	}
+	*a = aug_init(root, loadpath, flags);
 	if (*a == NULL)
 		luaL_error(L, "aug_init failed");
 	return 1;
@@ -82,13 +133,22 @@ static const luaL_reg Luag_meta_methods[] = {
 	{NULL,		NULL}
 };
 
+
 LUALIB_API int luaopen_augeas(lua_State *L)
 {
+	struct aug_flagmap *f = Taug_flagmap;
 	luaL_register(L, LIBNAME, Paug_methods);
 	lua_pushliteral(L, "version");
 	lua_pushliteral(L, VERSION);
 	lua_settable(L, -3);
 
+	while (f->name != NULL) {
+		lua_pushstring(L, f->name);
+		lua_pushinteger(L, f->value);
+		lua_settable(L, -3);
+		f++;
+	}
+
 	luaL_newmetatable(L, PAUG_META);
 	luaL_register(L, NULL, Luag_meta_methods);
 	lua_pushliteral(L, "__index");
-- 
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