Check the maildirs for unread mails and notifies the user about it.

checkmail.cpp

#include <iostream>
#include <sys/types.h>
#include <dirent.h>
#include <string.h>
#include <fstream>
#include <cstdlib>
#include <stdlib.h>

using namespace std;

string directories[] = { "/var/vmail/<domain>/<user>/cur",
                         "/var/vmail/<domain>/<user>/cur",
                         "/var/vmail/<domain>/<user>/cur",
                         "/var/vmail/<domain>/<user>/cur",
                         "/var/vmail/<domain>/<user>/cur" };
                        
string fileNames[] = { "count_john",
                        "count_john",
                        "count_john",
                        "count_john",
                        "count_john" };
                        
string deliveredTo[] = { "john@doe.com",
                         "john@doe.com",
                         "john@doe.com",
                         "john@doe.com",
                         "john@doe.com" };

void writeCurrentFileCount(const char *name, int count)
{
    ofstream file(name);
    if (file.is_open()) {
        file << count;
        file.close();
    }
}

int readCurrentFileCount(const char *name)
{
    ifstream file(name);
    if (file.is_open()) {
        string line;
        getline(file, line);
        file.close();
        return atoi(line.c_str());
    }
    return 0;
}

void sendPush(int i)
{
    string command ("/path/to/notifier ");
    const char *exec = (command + deliveredTo[i]).c_str();
    system(exec);
}

int main(int argc, char *argv[]) {
    for (int i = 0; i < 5; i++) {
        DIR *dir = opendir(directories[i].c_str());
        if (dir) {
            struct dirent *ent;
            string fileName;
            int count = 0;
            while((ent = readdir(dir)) != NULL) {
                fileName = ent->d_name;
                if ((fileName.compare(".") == 0) || (fileName.compare("..") == 0)) {
                    // Skip!
                } else {
                    count++;
                }
            }
            if (count > readCurrentFileCount(fileNames[i].c_str())) {
                sendPush(i);
                writeCurrentFileCount(fileNames[i].c_str(), count);
            }

        } else {
            cout << "Error opening directory" << endl;
        }
    }
    
    return 0;
}