diff --git a/main.cpp b/main.cpp
index dcf5af4..5266ff1 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,5 +1,6 @@
 #include <string>
 #include <iostream>
+#include <fstream>
 #include <filesystem>
 #include <vector>
 #include <chrono>
@@ -65,61 +66,71 @@ char *getBufferFromFile(const char* filename)
     return buffer;
 }
 
-#define IGNOREWHITESPACE while (*p!=0 && *p <= 32) { p++; }
-void loadLagueirtoFile()
+static inline void trim(std::string &s) {
+    while (!s.empty() && isspace(s.front())) s.erase(s.begin());
+    while (!s.empty() && isspace(s.back())) s.pop_back();
+}
+
+static inline std::string trim_copy(std::string s) {
+    trim(s);
+    return s;
+}
+
+bool loadLagueirtoFile(const std::string &section_to_load)
 {
-    char *buffer = getBufferFromFile("lagueirtofile");
-    char *p = buffer;
-    char token[255];
-    while (*p!=0)
+    std::ifstream f("lagueirtofile");
+    if (!f) { std::cerr << "Cannot open lagueirtofile\n"; exit(1); }
+
+    std::string line;
+    std::string current_section {"@none@"};
+    bool found_any_section = false;
+    bool found_default = false;
+    bool active = false;
+
+    while (std::getline(f, line))
     {
-        IGNOREWHITESPACE;  // Ignore whitespace
-        int i=0;
-        while (*p>32 && *p!='=') { token[i]=*p; i++; p++; }
-        IGNOREWHITESPACE
-        if (*p=='=')
+        // Quitar espacios al inicio y final
+        trim(line);
+
+        if (line.empty() || line[0] == '#')
+            continue;
+
+        // Detectar sección
+        if (line.front() == '[')
         {
-            token[i]=0;
-            int tokennum = -1;
-            for (int j=0;j<keys.size();++j) if (keys[j]==token) tokennum = j;
-            if (tokennum!=-1)
-            {
-                p++;
-                IGNOREWHITESPACE
-                i=0;
-                while (*p!='\r' && *p!='\n' && *p!=0) { token[i]=*p; i++; p++; }
-                token[i]=0;
-                switch (tokennum)
-                {
-                    case LIBS:
-                        libs = token;
-                        //std::cout << "LIBS: " << libs << std::endl;
-                        break;
-                    case CPPFLAGS:
-                        cppflags = token;
-                        //std::cout << "CPPFLAGS: " << cppflags << std::endl;
-                        break;
-                    case EXECUTABLE:
-                        executable = token;
-                        //std::cout << "EXECUTABLE: " << executable << std::endl;
-                        break;
-                    case SOURCEPATH:
-                        source_path = token;
-                        //std::cout << "SOURCEPATH: " << source_path << std::endl;
-                        break;
-                    case BUILDPATH:
-                        build_path = token;
-                        //std::cout << "BUILDPATH: " << build_path << std::endl;
-                        break;
-                    case EXCLUDE:
-                        exclude = split(token);
-                        //std::cout << "BUILDPATH: " << build_path << std::endl;
-                        break;
-                }
-            }
+            auto end = line.find(']');
+            if (end == std::string::npos) continue;
+
+            current_section = line.substr(1, end - 1);
+
+            // Detectar si es default
+            std::string rest = trim_copy(line.substr(end + 1));
+            found_any_section = true;
+            if (rest == "default") found_default = true;
+            if (section_to_load.empty() && rest == "default") active = true;
+            else active = (current_section == section_to_load);
+
+            continue;
         }
+
+        // Clave = valor
+        auto pos = line.find('=');
+        if (pos == std::string::npos)
+            continue;
+
+        std::string key = trim_copy(line.substr(0, pos));
+        std::string value = trim_copy(line.substr(pos + 1));
+
+        if (!active && current_section != "@none@") continue;
+
+        if (key == "libs") libs = value;
+        else if (key == "cppflags") cppflags = value;
+        else if (key == "executable") executable = value;
+        else if (key == "sourcepath") source_path = value;
+        else if (key == "buildpath") build_path = value;
+        else if (key == "exclude") exclude = split(value);
     }
-    free(buffer);
+    return !(found_any_section && section_to_load.empty() && !found_default);
 }
 
 std::string getFileExtension(std::string path)
@@ -154,73 +165,64 @@ const bool textFound(char *buffer, const char *text)
 }
 
 
-std::vector<std::string> getIncludes(std::string filename)
-{
-    char *buffer = getBufferFromFile(filename.c_str());
+std::vector<std::string> getIncludes(const std::string &filename) {
+    std::ifstream f(filename);
+    if (!f) return {};
 
     std::vector<std::string> includes;
+    std::string line;
 
-    char *p = buffer;
-    while (*p != 0)
-    {
-        // Ignore commented lines
-        if ( (*p=='/') && (*(p+1)!=0) && (*(p+1)=='/')) while( (*p != 0) && (*p != 13) ) p++;
+    while (std::getline(f, line)) {
+        // Quitar comentarios de línea
+        auto pos = line.find("//");
+        if (pos != std::string::npos)
+            line.resize(pos);
 
-        // Ignore comment blocks
-        if ( (*p=='/') && (*(p+1)!=0) && (*(p+1)=='*')) {
-            p+=2;
-            while( (*p != 0) && (*p != '*') && (*(p+1)!=0) && (*(p+1)!='/') ) p++;
-        }
+        // Buscar #include
+        pos = line.find("#include");
+        if (pos == std::string::npos)
+            continue;
 
-        if (*p=='#')
-        {
-            if (textFound(p, "#include"))
-            {
-                p+=8;
-                while(strchr(" \t", *p)) p++;   // Ignore whitespace (spaces and tabs)
-                if (*p == '"')
-                {
-                    p++;
-                    char *p2 = p;
-                    while (*p2!='"' && *p2!=0 ) p2++;
-                    if (*p2!=0) {
-                        *p2=0;
-                        includes.push_back(std::string(p));
-                        p = p2+1;
-                    }
-                }
-            }
-        }
-        p++;
+        // Avanzar tras "#include"
+        pos += 8;
+
+        // Saltar espacios
+        while (pos < line.size() && (line[pos] == ' ' || line[pos] == '\t'))
+            pos++;
+
+        // Solo queremos includes con comillas
+        if (pos >= line.size() || line[pos] != '"')
+            continue;
+
+        pos++; // saltar la primera comilla
+        size_t start = pos;
+
+        // Buscar la comilla de cierre
+        while (pos < line.size() && line[pos] != '"')
+            pos++;
+
+        if (pos < line.size())
+            includes.push_back(line.substr(start, pos - start));
     }
-    
-    free(buffer);
+
     return includes;
 }
 
-bool HeadersNeedRecompile(std::string file, std::filesystem::file_time_type object_file_write_time)
-{
+bool HeadersNeedRecompile(std::string file, std::filesystem::file_time_type object_file_write_time) {
     auto include_files = getIncludes(file);
-    for (auto include : include_files)
-    {
+    for (auto include : include_files) {
         std::filesystem::path fullpath(file);
         auto path_without_filename = fullpath.remove_filename(); 
         std::string src_path = path_without_filename.string();
 
         std::string include_file = src_path + include;
-        if (!std::filesystem::exists(include_file))
-        {
+        if (!std::filesystem::exists(include_file)) {
             std::cout << "WARNING: Include file '" << include_file << "' not found." << std::endl;
-        }
-        else
-        {
+        } else {
             auto include_file_write_time = std::filesystem::last_write_time(include_file);
-            if (include_file_write_time > object_file_write_time)
-            {
+            if (include_file_write_time > object_file_write_time) {
                 return true;
-            }
-            else
-            {
+            } else {
                 if (HeadersNeedRecompile(include_file, object_file_write_time)) return true;
             }
         }
@@ -228,39 +230,29 @@ bool HeadersNeedRecompile(std::string file, std::filesystem::file_time_type obje
     return false;
 }
 
-bool MustRecompile(std::string source_file)
-{
+bool MustRecompile(std::string source_file) {
     std::string object_file = build_path + folder_char + getFileNameWithoutExtension(source_file)+".o";
 
     // si el objecte no existeix, fa falta recompilar
-    if (!std::filesystem::exists(object_file))
-    {
+    if (!std::filesystem::exists(object_file)) {
         return true;
-    }
-    else
-    {
+    } else {
         // Si sí que existeix, agafem la data de modificació
         auto object_file_write_time = std::filesystem::last_write_time(object_file);
         
         // Si la data de modificació del cpp es major que la del objecte, fa falta recompilar
         auto source_file_write_time = std::filesystem::last_write_time(source_file);
-        if (source_file_write_time > object_file_write_time)
-        {
+        if (source_file_write_time > object_file_write_time) {
             return true;
-        }
-        else
-        {
-            if (HeadersNeedRecompile(source_file, object_file_write_time))
-                return true;
+        } else {
+            if (HeadersNeedRecompile(source_file, object_file_write_time)) return true;
         }
     }
     return false;
 }
 
-void MaybeRecompile(std::string source_file)
-{
-    if (MustRecompile(source_file))
-    {
+void MaybeRecompile(std::string source_file) {
+    if (MustRecompile(source_file)) {
         std::string object_file = build_path + folder_char + getFileNameWithoutExtension(source_file)+".o";
         must_link = true;
         std::string command = "g++ " + source_file + " " + cppflags + " -c -o " + object_file;
@@ -269,116 +261,94 @@ void MaybeRecompile(std::string source_file)
         std::chrono::steady_clock::time_point begin = std::chrono::steady_clock::now();
         system(command.c_str());
         std::chrono::steady_clock::time_point end = std::chrono::steady_clock::now();
+
         float t = float(std::chrono::duration_cast<std::chrono::microseconds>(end - begin).count())/1000000;
         std::cout << "(" << t << " seconds)" << std::endl;
-    }
-    else
-    {
+    } else {
         //std::cout << object_file << " està actualitzat" << std::endl;
     }
 }
 
+void processCommand(std::string arg) {
+    // Do nothing for now
+}
+
 int main(int argc, char *argv[])
 {
-    if (argc>1) {
-        for (int i=1; i<argc; ++i) {
-            if (argv[i][0] == '-') {
-                if (strcmp(argv[i], "--clean")==0) {
-                    system("rm -rf build");
-                }
-            } else {
-                std::filesystem::current_path(argv[i]);
-            }
-        }
+    std::string configuration_to_use;
+    for (int i = 1; i < argc; ++i)
+    {
+        std::string arg = argv[i];
+        if (!arg.empty() && arg[0] == '-') processCommand(arg);
+        else configuration_to_use = arg;
+    }
+
+    if (!loadLagueirtoFile(configuration_to_use)) {
+        std::cerr << "No default section found.\n";
+        exit(1);
     }
-    
-    loadLagueirtoFile();
 
     std::chrono::steady_clock::time_point begin_all = std::chrono::steady_clock::now();
 
-    if (!std::filesystem::is_directory(build_path))
-    {
-        std::filesystem::create_directory(build_path);
-    }
+    if (!std::filesystem::is_directory(build_path)) std::filesystem::create_directory(build_path);
+    auto source_paths = split(source_path);
 
-auto source_paths = split(source_path);
+    for (auto src_path : source_paths) {
+        bool recursive = false;
 
-for (auto src_path : source_paths)
-{
-    bool recursive = false;
+        if (!src_path.empty() && src_path.back() == '+') {
+            recursive = true;
+            src_path.pop_back();
+        }
 
-    if (!src_path.empty() && src_path.back() == '+')
-    {
-        recursive = true;
-        src_path.pop_back();
-    }
+        #ifdef _WIN32
+        std::replace(src_path.begin(), src_path.end(), '/', '\\');
+        #endif
 
-    #ifdef _WIN32
-    std::replace(src_path.begin(), src_path.end(), '/', '\\');
-    #endif
+        if (!std::filesystem::is_directory(src_path)) {
+            if (std::filesystem::is_regular_file(src_path)) {
+                std::string ext = getFileExtension(src_path);
 
-    if (!std::filesystem::is_directory(src_path))
-    {
-        if (std::filesystem::is_regular_file(src_path))
-        {
-            std::string ext = getFileExtension(src_path);
-            if (ext == "cpp" || ext == "c")
-            {
-                MaybeRecompile(src_path);
-            }
-            else
-            {
-                std::cout << "ERROR: '" << src_path << "' is not a .c/.cpp file." << std::endl;
+                if (ext == "cpp" || ext == "c") {
+                    MaybeRecompile(src_path);
+                } else {
+                    std::cout << "ERROR: '" << src_path << "' is not a .c/.cpp file." << std::endl;
+                    exit(1);
+                }
+            } else {
+                std::cout << "ERROR: '" << src_path << "' does not exist." << std::endl;
                 exit(1);
             }
-        }
-        else
-        {
-            std::cout << "ERROR: '" << src_path << "' does not exist." << std::endl;
-            exit(1);
-        }
-    }
-    else
-    {
-        std::string path = "." + folder_char + src_path;
+        } else {
+            std::string path = "." + folder_char + src_path;
 
-        if (recursive)
-        {
-            for (const auto &entry : std::filesystem::recursive_directory_iterator(path))
-            {
-                if (!entry.is_regular_file()) continue;
+            if (recursive) {
+                for (const auto &entry : std::filesystem::recursive_directory_iterator(path)) {
+                    if (!entry.is_regular_file()) continue;
 
-                std::string source_file = entry.path().string();
-                std::string ext = getFileExtension(source_file);
+                    std::string source_file = entry.path().string();
+                    std::string ext = getFileExtension(source_file);
 
-                if ((ext == "cpp" || ext == "c") &&
-                    !contains(exclude, entry.path().filename()))
-                {
-                    MaybeRecompile(source_file);
+                    if ((ext == "cpp" || ext == "c") && !contains(exclude, entry.path().filename())) {
+                        MaybeRecompile(source_file);
+                    }
                 }
-            }
-        }
-        else
-        {
-            for (const auto &entry : std::filesystem::directory_iterator(path))
-            {
-                if (!entry.is_regular_file()) continue;
+            } else {
+                for (const auto &entry : std::filesystem::directory_iterator(path)) {
+                    if (!entry.is_regular_file()) continue;
 
-                std::string source_file = entry.path().string();
-                std::string ext = getFileExtension(source_file);
+                    std::string source_file = entry.path().string();
+                    std::string ext = getFileExtension(source_file);
 
-                if ((ext == "cpp" || ext == "c") &&
-                    !contains(exclude, entry.path().filename()))
-                {
-                    MaybeRecompile(source_file);
+                    if ((ext == "cpp" || ext == "c") && !contains(exclude, entry.path().filename())) {
+                        MaybeRecompile(source_file);
+                    }
                 }
             }
         }
     }
-}
 
-    if (must_link)
-    {
+    if (must_link) {
         std::string command = "g++ " + build_path + folder_char + "*.o " + libs + " -o " + executable;
         std::cout << command << std::endl;
         if (system(command.c_str()) != 0) {
@@ -388,9 +358,7 @@ for (auto src_path : source_paths)
         std::chrono::steady_clock::time_point end_all = std::chrono::steady_clock::now();
         float t = float(std::chrono::duration_cast<std::chrono::microseconds>(end_all - begin_all).count())/1000000;
         std::cout << "(" << t << " seconds)" << std::endl;
-    }
-    else
-    {
+    } else {
         std::cout << "Everything is up to date. Nothing to do." << std::endl;
     }
 }
\ No newline at end of file