Command functions have now a CommandExecutor* arg, parent of Shell class. Added possibility to make a threadCommand (a built-in command that runs in his thread).

Msh.pro

@@ -7,9 +7,11 @@ SOURCES += main.cpp \
     command.cpp \
     commands.cpp \
     cmds.cpp \
-    shell.cpp
+    shell.cpp \
+    commandexecutor.cpp
 
 HEADERS += \
     command.h \
     shell.h \
-    cmds.h
+    cmds.h \
+    commandexecutor.h

cmds.cpp

@@ -3,9 +3,10 @@
 */
 
 #include "cmds.h"
+
 using namespace std;
 
-int Cmds::cdExecute(const vector<string>* args){
+int Cmds::cdExecute(const vector<string>* args, CommandExecutor*){
   if (args->operator[](1) == "\0") {
     cerr << "expected argument to \"cd\"\n";
   } else {
@@ -16,11 +17,11 @@ int Cmds::cdExecute(const vector<string>* args){
   return 1;
 }
 
-int Cmds::exitExecute(const vector<string>*){
-  return 0;
+int Cmds::exitExecute(const vector<string>*, CommandExecutor*){
+  return 0; //TODO: better exit signal giving
 }
 
-int Cmds::helpExecute(const vector<string>*){
+int Cmds::helpExecute(const vector<string>*, CommandExecutor*){
     cout << " info" << endl;
     return 1;
 }

cmds.h

@@ -1,6 +1,6 @@
 #ifndef CMDS_H
 #define CMDS_H
-
+#include "commandexecutor.h"
 #include <iostream>
 #include <vector>
 #include <string>
@@ -9,9 +9,9 @@ using std::string;
 using std::vector;
 
 namespace Cmds {
-    int cdExecute(const vector<string>* args);
-    int exitExecute(const vector<string>*);
-    int helpExecute(const vector<string>*);
+    int cdExecute(const vector<string>* args, CommandExecutor*);
+    int exitExecute(const vector<string>*, CommandExecutor*);
+    int helpExecute(const vector<string>*, CommandExecutor*);
 }
 
 #endif // CMDS_H

command.cpp

@@ -1,12 +1,13 @@
 #include "shell.h"
 
-Command::Command(const string& n, int (*funcptr)(const vector<string>* args)) : name(n) , funcCommand(funcptr){
+Command::Command(const string& n, int (*funcptr)(const vector<string>* args, CommandExecutor*)) : name(n) , funcCommand(funcptr){
     checkObj();
     numCom++;
 }
 
-int Command::execute(const vector<string>* args){
-    return (*funcCommand)(args);
+int Command::execute(const vector<string>* args, CommandExecutor* ciao){
+    if(args==nullptr) return -1;
+    return (*funcCommand)(args, ciao);
 }
 
 string Command::getName(){

command.h

@@ -2,6 +2,8 @@
 #define COMMAND_H
 #include <string>
 #include <vector>
+#include "shell.h"
+#include "commandexecutor.h"
 
 using std::string;
 using std::vector;
@@ -10,15 +12,15 @@ class Command
 {
     const string name;
     static unsigned int numCom;
-    int (*funcCommand)(const vector<string>*);
+    int (*funcCommand)(const vector<string>*,CommandExecutor*);
     void checkObj();
 
 public:
-    Command(const string& n, int (*funcptr)(const vector<string>* args));
+    Command(const string& n, int (*funcptr)(const vector<string>* args, CommandExecutor*));
     Command(const Command&);
     ~Command();
     string getName();
-    int execute(const vector<string>*);
+    int execute(const vector<string>*, CommandExecutor* ciao);
 };
 
 class CommandNameNotValidException{};

commandexecutor.cpp

@@ -0,0 +1,6 @@
+#include "commandexecutor.h"
+
+CommandExecutor::CommandExecutor()
+{
+
+}

commandexecutor.h

@@ -0,0 +1,15 @@
+#ifndef COMMANDEXECUTOR_H
+#define COMMANDEXECUTOR_H
+#include <vector>
+#include <string>
+
+class CommandExecutor
+{
+public:
+    virtual int executeCmd(std::vector<std::string>* args) = 0;
+    virtual int executeCmd(const std::string& args) = 0;
+    virtual size_t howManyCmds() const = 0;
+    CommandExecutor();
+};
+
+#endif // COMMANDEXECUTOR_H

commands.cpp

@@ -1,23 +1,25 @@
 #include "shell.h"
 
-Shell::Commands::Commands()
+Shell::Commands::Commands(Shell* s) : commands(), threadCommands()
 {
+    parent = s;
     if(created) throw CommandsAlreadyCreatedException();
     created=true;
 }
 
-void Shell::Commands::add(Command* cmd){
-    commands.push_back(cmd);
+void Shell::Commands::add(Command* cmd, bool isthread){
+    if(!isthread) commands.push_back(cmd);
+    else threadCommands.push_back(cmd);
 }
 
-size_t Shell::Commands::howMany(){
+size_t Shell::Commands::howMany() const{
     return commands.size();
 }
 
-int Shell::Commands::launch(const vector<string>* args){
-    for(unsigned int i=0; i<commands.size(); i++){
-        if((commands[i]->getName())==args->operator [](0)){
-            return commands[i]->execute(args);
+int Shell::Commands::launch(const vector<string>* args, bool launchThread){
+    for(unsigned int i=0; i<(launchThread ? threadCommands.size() : commands.size()); i++){
+        if((launchThread ? threadCommands[i]->getName() : commands[i]->getName())==args->operator [](0)){
+            return (launchThread ? threadCommands[i]->execute(args, parent) : commands[i]->execute(args, parent));
         }
     }
     throw CommandNotFoundException();

shell.cpp

@@ -20,7 +20,7 @@ void Shell::setName(const string &value)
     name = value;
 }
 
-Shell::Shell( string n, string ps,void (*s)(Shell*)) : cmds()
+Shell::Shell( string n, string ps,void (*s)(Shell*)) : cmds(this)
 {
     shellSetup = s;
     name = n;
@@ -57,17 +57,26 @@ void Shell::launch(){
         }
     }while(!readSuccess);
     args = split_line(line);
-    status = execute(args);
+    status = executeCmd(args);
+    delete args;
   } while (status);
 }
 
-int Shell::launch(vector<string>* args)
+int Shell::launchCmd(vector<string>* args)
 {
-    pid_t pid;
     int status;
 
-    pid = fork();
+    pid_t pid = fork();
     if (pid == 0) {
+        //child process
+
+        //execute threadCommand
+        int a;
+        try {
+            a=cmds.launch(args, true);
+        }
+        catch (CommandNotFoundException){
+            //execute bash command or program
             vector<char *> argv(args->size() + 1);
             size_t i;
             for (i = 0; i != args->size()-1; ++i)
@@ -75,38 +84,45 @@ int Shell::launch(vector<string>* args)
                 argv[i] = &(args->operator[](i)[0]);
             }
             argv[i] = NULL;
-    if(execvp(argv[0], argv.data()) == -1) {
+            if((a=execvp(argv[0], argv.data())) == -1) {
                 cerr << name <<": command " << args->operator [](0) << " not found\n";
             }
             exit(EXIT_FAILURE);
         }
+        exit(EXIT_SUCCESS);
+    }
     else if (pid < 0) {
         // Error forking
-        cerr << name <<": error forking\n";
+        cerr << name <<": error forking the process\n";
     }
     else {
         // Parent process
         do {
+            //wait until child finished
             waitpid(pid, &status, WUNTRACED);
         } while (!WIFEXITED(status) && !WIFSIGNALED(status));
     }
     return 1;
 }
 
-int Shell::execute(vector<string>* args)
+int Shell::executeCmd(vector<string>* args)
 {
     if (args->operator [](0) == "\0") {
         // An empty command was entered.
         return 1;
     }
-  int a;
+    int ret;
     try {
-      a=cmds.launch(args);
+        ret = cmds.launch(args, false);
     }
     catch(CommandNotFoundException) {
-    return launch(args);
+        ret = launchCmd(args);
     }
-  return a;
+    return ret;
+}
+
+inline int Shell::executeCmd(const std::string &args){
+    return executeCmd(split_line(&args));
 }
 
 void Shell::EofHandler(int){
@@ -135,7 +151,7 @@ string* Shell::read_line()
     return buffer;
 }
 
-vector<string>* Shell::split_line(string* line)
+vector<string>* Shell::split_line(const string* line)
 {
     vector<string>* tokens = new vector<string>();
     string ln = *line;
@@ -150,10 +166,10 @@ vector<string>* Shell::split_line(string* line)
 
 bool Shell::undoingLine = false;
 
-void Shell::addCmd(Command* cmd){
-    cmds.add(cmd);
+void Shell::addCmd(Command* cmd, bool isthread){
+    cmds.add(cmd, isthread);
 }
 
-size_t Shell::howManyCmds(){
+size_t Shell::howManyCmds() const{
     return cmds.howMany();
 }

shell.h

@@ -10,6 +10,8 @@
 #include <vector>
 #include <csignal>
 #include "command.h"
+//#include "commands.h"
+#include "commandexecutor.h"
 using std::string;
 using std::cin;
 using std::cout;
@@ -19,20 +21,25 @@ using std::vector;
 using std::istringstream;
 using std::nullptr_t;
 
-class Shell
+class Shell : public CommandExecutor
 {
     class Commands
     {
-        vector<Command*> commands;
-        static bool created;
-        Commands(Commands&);
-    public:
-        Commands();
-        void add(Command*);
-        size_t howMany();
-        int launch(const vector<string>* args);
-    };
+        Shell* parent;
+        vector<Command*> commands; //commands that work the same thread of the shell
+        vector<Command*> threadCommands; //commands that work on a different thread
 
+        //just one instance of the object
+        static bool created;
+        Commands(const Commands&);
+        Commands operator=(const Commands&);
+
+    public:
+        Commands(Shell*);
+        void add(Command*, bool isthread=false);
+        size_t howMany() const;
+        int launch(const vector<string>* args, bool launchThread=false);
+    };
     static bool undoingLine;
     Commands cmds;
     string ps;
@@ -40,11 +47,10 @@ class Shell
     void (*shellSetup)(Shell *);
     bool notLoop;
 
-    int launch(vector<string>* args);
-    int execute(vector<string>* args);
+    int launchCmd(vector<string>* args);
     static void EofHandler(int);
     string* read_line();
-    vector<string>* split_line(string* line);
+    vector<string>* split_line(const string* line);
 
     class IsUndoingLineException {};
 
@@ -57,8 +63,10 @@ public:
     void launch();
 
     //for in-shell commands
-    void addCmd(Command *cmd);
-    size_t howManyCmds();
+    void addCmd(Command *cmd, bool isThread=false);
+    size_t howManyCmds() const;
+    int executeCmd(vector<string>* args);
+    int executeCmd(const string& args);
 
     //exceptions
     class CommandsAlreadyCreatedException{};