feat: a simple fork-exec pattern

command/command.cpp

@@ -1,10 +1,33 @@
 #include "command.hpp"
 
 #include <iostream>
+#include <stdlib.h>
+#include <sys/wait.h>
 #include <unistd.h>
+#include <vector>
 
 void Variable::execute() {}
 
-void Command::execute() {}
+void Command::execute() {
+  pid_t pid = fork();
+  if (pid == -1) {
+    std::cout << "[fork error]: cannot fork\n";
+    exit(EXIT_FAILURE);
+  } else if (pid == 0) {
+    std::vector<char *> argv{};
+    argv.resize(arguments.size() + 2);
+
+    argv[0] = const_cast<char *>(command.c_str());
+    for (size_t i = 0; i < arguments.size(); i++) {
+      argv[i + 1] = const_cast<char *>(arguments[i].c_str());
+    }
+
+    argv.back() = nullptr;
+
+    execv(command.c_str(), argv.data());
+  } else {
+    wait(NULL);
+  }
+}
 
 void PipeCommand::execute() {}

miniShell.cpp

@@ -17,14 +17,18 @@ void start(std::istream &is, bool isFile = false) {
     std::string script{};
     std::getline(is, script);
 
-    if (script.empty()) {
+    if (is.eof()) {
       return;
     }
 
     if (!script.empty() && script.back() == '\n') {
       script.erase(script.length() - 1);
     }
 
+    if (script.empty()) {
+      continue;
+    }
+
     auto command = parser.parseScript(script);
     if (command != nullptr) {
       command->execute();