src/mods.cpp

   1 /*
   2 Minetest-c55
   3 Copyright (C) 2011 celeron55, Perttu Ahola <celeron55@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation; either version 2 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "mods.h"
  21 #include <queue>
  22 #include <fstream>
  23 #include <sstream>
  24 #include <map>
  25 #include "filesys.h"
  26 #include "strfnd.h"
  27 #include "log.h"
  28
  29 // Get a dependency-sorted list of ModSpecs
  30 core::list<ModSpec> getMods(core::list<std::string> &modspaths)
  31 {
  32         std::queue<ModSpec> mods_satisfied;
  33         core::list<ModSpec> mods_unsorted;
  34         core::list<ModSpec> mods_sorted;
  35         // name, path: For detecting name conflicts
  36         std::map<std::string, std::string> mod_names;
  37         for(core::list<std::string>::Iterator i = modspaths.begin();
  38                         i != modspaths.end(); i++){
  39                 std::string modspath = *i;
  40                 std::vector<fs::DirListNode> dirlist = fs::GetDirListing(modspath);
  41                 for(u32 j=0; j<dirlist.size(); j++){
  42                         if(!dirlist[j].dir)
  43                                 continue;
  44                         std::string modname = dirlist[j].name;
  45                         std::string modpath = modspath + DIR_DELIM + modname;
  46                         // Detect mod name conflicts
  47                         {
  48                                 std::map<std::string, std::string>::const_iterator i;
  49                                 i = mod_names.find(modname);
  50                                 if(i != mod_names.end()){
  51                                         std::string s;
  52                                         infostream<<"WARNING: Mod name conflict detected: "
  53                                                         <<std::endl
  54                                                         <<"Already loaded: "<<i->second<<std::endl
  55                                                         <<"Will not load: "<<modpath<<std::endl;
  56                                         continue;
  57                                 }
  58                         }
  59                         std::set<std::string> depends;
  60                         std::ifstream is((modpath+DIR_DELIM+"depends.txt").c_str(),
  61                                         std::ios_base::binary);
  62                         while(is.good()){
  63                                 std::string dep;
  64                                 std::getline(is, dep);
  65                                 dep = trim(dep);
  66                                 if(dep != "")
  67                                         depends.insert(dep);
  68                         }
  69                         ModSpec spec(modname, modpath, depends);
  70                         mods_unsorted.push_back(spec);
  71                         if(depends.empty())
  72                                 mods_satisfied.push(spec);
  73                         mod_names[modname] = modpath;
  74                 }
  75         }
  76         // Sort by depencencies
  77         while(!mods_satisfied.empty()){
  78                 ModSpec mod = mods_satisfied.front();
  79                 mods_satisfied.pop();
  80                 mods_sorted.push_back(mod);
  81                 for(core::list<ModSpec>::Iterator i = mods_unsorted.begin();
  82                                 i != mods_unsorted.end(); i++){
  83                         ModSpec &mod2 = *i;
  84                         if(mod2.unsatisfied_depends.empty())
  85                                 continue;
  86                         mod2.unsatisfied_depends.erase(mod.name);
  87                         if(!mod2.unsatisfied_depends.empty())
  88                                 continue;
  89                         mods_satisfied.push(mod2);
  90                 }
  91         }
  92         std::ostringstream errs(std::ios::binary);
  93         // Check unsatisfied dependencies
  94         for(core::list<ModSpec>::Iterator i = mods_unsorted.begin();
  95                         i != mods_unsorted.end(); i++){
  96                 ModSpec &mod = *i;
  97                 if(mod.unsatisfied_depends.empty())
  98                         continue;
  99                 errs<<"mod \""<<mod.name
 100                                 <<"\" has unsatisfied dependencies:";
 101                 for(std::set<std::string>::iterator
 102                                 i = mod.unsatisfied_depends.begin();
 103                                 i != mod.unsatisfied_depends.end(); i++){
 104                         errs<<" \""<<(*i)<<"\"";
 105                 }
 106                 errs<<"."<<std::endl;
 107                 mods_sorted.push_back(mod);
 108         }
 109         if(errs.str().size() != 0){
 110                 throw ModError(errs.str());
 111         }
 112         return mods_sorted;
 113 }
 114
 115