main.c

# include "simple.h"
// void signal_handler(int sig) {
//     // Clear the screen
//     system("/usr/bin/clear");
//     printf("$ ");
//     fflush(stdout);
// }

void exit_message(int err_no, char *line) {
    free(line);
    // perror("Error");
    exit(err_no);
}

int main(int ac, char **av) {
    (void) ac;
    (void) av;

    int is_terminal = isatty(STDIN_FILENO);

    char *line = NULL;
    size_t len = 0;
    ssize_t read;
    pid_t pid;

    while (1) {
        if (is_terminal) {
            printf("$ ");
            fflush(stdout);
        }
        read = getline(&line, &len, stdin);
        if (read == -1)
            exit_message(0, line);
        if (read > 0 && line[read - 1] == '\n')
            line[read - 1] = '\0';
        if (strcmp(line, "exit") == 0)
            exit(0);
        else {
            char *args[BUFSIZ];
            char *token = strtok(line, " ");
            int i = 0;
            while (token != NULL) {
                args[i++] = token;
                token = strtok(NULL, " ");
            }
            args[i] = NULL;

            pid = fork();
            if (pid == -1)
                exit_message(12, line);
            else if (pid == 0) {
                if (execvp(args[0], args) == -1)
                    exit_message(2, line);
            } else
                waitpid(pid, NULL, 0);
        }
        if (!is_terminal && feof(stdin)) // Exit loop if input is from a pipe and EOF is reached
            break;
    }
    return 0;
}