#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>

#define MAXARGS 256

int main()
{
        char* usrinput = NULL;
        int n = 0;    
        while (1)
        {
				
				char pwd[100];
				getcwd(pwd,100);
	
                printf("[%s] &",pwd);
 
                char readcomm = getline(&usrinput, &n, stdin);

                if (usrinput[readcomm-1] == '\n')
                {
                        usrinput[readcomm-1] = 0;
                }
 
                char* command[MAXARGS + 1] = {strtok(usrinput, " "), 0 };
                char* ptr;
                int i = 1;
                while (ptr = strtok(NULL, " "))
                {			
                        command[i] = ptr;
                        i++;
                }
                if (strcmp(command[0], "exit")==0) 
                {		
						return 0;
                }
                
                if (strcmp(command[0], "help")==0) 
				{
                        printf("\n========================================\n=          Arkadiusz Charliński        =\n");
                        printf("= własna implemantacja: exit, help, cd =\n========================================\n\n");
                        continue;
						exit(EXIT_FAILURE);
                }
 
                if (strcmp(command[0],"cd") == 0)
                {
					if (command[1]==NULL)
					{
						chdir(getenv("HOME"));
						continue;
						exit(EXIT_FAILURE);
					}
				
					else
					{
						chdir(command[1]);
						continue;
						exit(EXIT_FAILURE);
					}
				}
				
                int pid = fork();
                 
                if (pid==0 && strcmp(command[0],"help") !=0 && strcmp(command[0],"cd") !=0 && strcmp(command[0],"exit") !=0) 
                {
                        execvp(command[0], command);
                        perror(command[0]);
                        exit(EXIT_FAILURE);
                }
                 else 
                {
                      waitpid(pid, NULL, 0); 
                }
 
		}
    return 0;
}