From bd21f00f0a1bb23d4503d58a502a796dbe3fd5b4 Mon Sep 17 00:00:00 2001
From: Perttu Ahola <celeron55@gmail.com>
Date: Sun, 11 Dec 2011 16:49:40 +0200
Subject: [PATCH] Add minetest.get_modpath(modname)

---
 data/mods/default/init.lua      |  1 +
 data/mods/experimental/init.lua |  2 ++
 src/mods.h                      |  5 +++++
 src/scriptapi.cpp               | 18 ++++++++++++++++++
 src/server.cpp                  | 26 ++++++++++++++++++--------
 src/server.h                    |  6 ++++++
 6 files changed, 50 insertions(+), 8 deletions(-)

diff --git a/data/mods/default/init.lua b/data/mods/default/init.lua
index 782eba5a5..95d9c19ff 100644
--- a/data/mods/default/init.lua
+++ b/data/mods/default/init.lua
@@ -110,6 +110,7 @@
 -- minetest.chat_send_all(text)
 -- minetest.chat_send_player(name, text)
 -- minetest.get_player_privs(name) -> set of privs
+-- minetest.get_modpath(modname) -> eg. "/home/user/.minetest/usermods/modname"
 --
 -- stackstring_take_item(stackstring) -> stackstring, item
 -- stackstring_put_item(stackstring, item) -> stackstring, success
diff --git a/data/mods/experimental/init.lua b/data/mods/experimental/init.lua
index 6b82b02a2..d180d4778 100644
--- a/data/mods/experimental/init.lua
+++ b/data/mods/experimental/init.lua
@@ -405,4 +405,6 @@ minetest.register_abm({
     end,
 })--]]
 
+print("experimental modpath="..dump(minetest.get_modpath("experimental")))
 
+-- END
diff --git a/src/mods.h b/src/mods.h
index a6beb24f2..e85ec2f4c 100644
--- a/src/mods.h
+++ b/src/mods.h
@@ -17,6 +17,9 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
+#ifndef MODS_HEADER
+#define MODS_HEADER
+
 #include "irrlichttypes.h"
 #include <set>
 #include <string>
@@ -59,3 +62,5 @@ struct ModSpec
 core::list<ModSpec> getMods(core::list<std::string> &modspaths)
 		throw(ModError);
 
+#endif
+
diff --git a/src/scriptapi.cpp b/src/scriptapi.cpp
index c759683ed..40ad4d547 100644
--- a/src/scriptapi.cpp
+++ b/src/scriptapi.cpp
@@ -1334,6 +1334,23 @@ static int l_get_player_privs(lua_State *L)
 	return 1;
 }
 
+// get_modpath(modname)
+static int l_get_modpath(lua_State *L)
+{
+	const char *modname = luaL_checkstring(L, 1);
+	// Get server from registry
+	lua_getfield(L, LUA_REGISTRYINDEX, "minetest_server");
+	Server *server = (Server*)lua_touserdata(L, -1);
+	// Do it
+	const ModSpec *mod = server->getModSpec(modname);
+	if(!mod){
+		lua_pushnil(L);
+		return 1;
+	}
+	lua_pushstring(L, mod->path.c_str());
+	return 1;
+}
+
 static const struct luaL_Reg minetest_f [] = {
 	{"register_nodedef_defaults", l_register_nodedef_defaults},
 	{"register_entity", l_register_entity},
@@ -1350,6 +1367,7 @@ static const struct luaL_Reg minetest_f [] = {
 	{"chat_send_all", l_chat_send_all},
 	{"chat_send_player", l_chat_send_player},
 	{"get_player_privs", l_get_player_privs},
+	{"get_modpath", l_get_modpath},
 	{NULL, NULL}
 };
 
diff --git a/src/server.cpp b/src/server.cpp
index 11c11b259..68a84b248 100644
--- a/src/server.cpp
+++ b/src/server.cpp
@@ -910,10 +910,10 @@ Server::Server(
 		throw ModError("Failed to load and run "+builtinpath);
 	}
 	// Load and run "mod" scripts
-	core::list<ModSpec> mods = getMods(m_modspaths);
-	for(core::list<ModSpec>::Iterator i = mods.begin();
-			i != mods.end(); i++){
-		ModSpec mod = *i;
+	m_mods = getMods(m_modspaths);
+	for(core::list<ModSpec>::Iterator i = m_mods.begin();
+			i != m_mods.end(); i++){
+		const ModSpec &mod = *i;
 		infostream<<"Server: Loading mod \""<<mod.name<<"\""<<std::endl;
 		std::string scriptpath = mod.path + DIR_DELIM + "init.lua";
 		bool success = scriptapi_loadmod(m_lua, scriptpath, mod.name);
@@ -4203,10 +4203,9 @@ void Server::SendTextures(u16 peer_id)
 	texture_bunches.push_back(core::list<SendableTexture>());
 	
 	u32 texture_size_bunch_total = 0;
-	core::list<ModSpec> mods = getMods(m_modspaths);
-	for(core::list<ModSpec>::Iterator i = mods.begin();
-			i != mods.end(); i++){
-		ModSpec mod = *i;
+	for(core::list<ModSpec>::Iterator i = m_mods.begin();
+			i != m_mods.end(); i++){
+		const ModSpec &mod = *i;
 		std::string texturepath = mod.path + DIR_DELIM + "textures";
 		std::vector<fs::DirListNode> dirlist = fs::GetDirListing(texturepath);
 		for(u32 j=0; j<dirlist.size(); j++){
@@ -4560,6 +4559,17 @@ IWritableCraftItemDefManager* Server::getWritableCraftItemDefManager()
 	return m_craftitemdef;
 }
 
+const ModSpec* Server::getModSpec(const std::string &modname)
+{
+	for(core::list<ModSpec>::Iterator i = m_mods.begin();
+			i != m_mods.end(); i++){
+		const ModSpec &mod = *i;
+		if(mod.name == modname)
+			return &mod;
+	}
+	return NULL;
+}
+
 v3f findSpawnPos(ServerMap &map)
 {
 	//return v3f(50,50,50)*BS;
diff --git a/src/server.h b/src/server.h
index f775f3391..ac8938175 100644
--- a/src/server.h
+++ b/src/server.h
@@ -32,6 +32,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "gamedef.h"
 #include "serialization.h" // For SER_FMT_VER_INVALID
 #include "serverremoteplayer.h"
+#include "mods.h"
 struct LuaState;
 typedef struct lua_State lua_State;
 class IWritableToolDefManager;
@@ -502,6 +503,8 @@ public:
 	IWritableCraftDefManager* getWritableCraftDefManager();
 	IWritableCraftItemDefManager* getWritableCraftItemDefManager();
 
+	const ModSpec* getModSpec(const std::string &modname);
+
 private:
 
 	// con::PeerHandler implementation.
@@ -646,6 +649,9 @@ private:
 	// CraftItem definition manager
 	IWritableCraftItemDefManager *m_craftitemdef;
 	
+	// Mods
+	core::list<ModSpec> m_mods;
+	
 	/*
 		Threads
 	*/