alias.cpp

//PANAGIOTIS KONTOEIDIS
//1115201900266

#include "libs.h"

void add_alias(tokens command)
{ // add command to alias table
    char *cmd;
    char *temp;

    if (command.size() < 2)
    {
        cout << "Incorrect alias Syntax" << endl;
        return;
    }
    else
    {
        if (command.size() == 3) //
        {
            temp = new char[strlen(command[2]) - 2]; // store the alias without the ""
            int j = 0;
            for (int i = 0; i < strlen(command[2]); i++)
            {
                if (command[2][i] != '"' && command[2][i] != ';')
                {
                    temp[j++] = command[2][i];
                }
            }
            temp[j] = '\0';
        }
        else if (command.size() > 3)
        {
            int k = 0;
            temp = new char[100];

            for (int i = 2; i < command.size(); i++)
            {
                for (int j = 0; j < strlen(command[i]); j++)
                {
                    if (command[i][j] != '"' && command[i][j] != ';')
                    {
                        temp[k++] = command[i][j];
                    }
                }
                temp[k++] = ' ';
            }

            temp[k + 1] = '\0';
        }

        if (!alias_table.empty())
        {
            for (int i = 0; i < alias_table.size(); i++)
            { // if an alias with the same name is found delete it to update it with the new command
                if (strcmp(alias_table[i].first, command[1]) == 0)
                {
                    auto it = alias_table.begin() + i;
                    alias_table.erase(it);
                }
            }
        }
        alias_table.push_back(make_pair(command[1], temp)); // insert it to alias table
        return;
    }
}

void print_alias()
{ // prints alias table
    if (alias_table.empty())
    {
        return;
    }
    for (auto &p : alias_table)
    {
        cout << p.first << " -> " << p.second << endl;
    }
}

void remove_alias(tokens command)
{ // removes alias from alias table

    char *temp = new char[strlen(command[1])];
    int j = 0;

    if (alias_table.empty())
    {
        return;
    }
    for (int i = 0; i < strlen(command[1]); i++)
    {
        if (command[1][i] != ';')
        {
            temp[j++] = command[1][i];
        }
    }
    temp[j] = '\0';
    for (int i = 0; i < alias_table.size(); i++) // if an alias with the same name is found delete it to update it with the new command
    {
        if (strcmp(alias_table[i].first, temp) == 0)
        {
            auto it = alias_table.begin() + i;
            alias_table.erase(it);
        }
    }
    delete[] temp;
    return;
}

tokens check_for_aliases(tokens command) // parses command and if it finds alias it replaces it and returns updated command
{
    tokens alias_command;

    alias_command.clear();
    int alias_flag = 0;

    if (strcmp(command[0], "createalias") == 0)
    {
        return command;
    }
    else if (strcmp(command[0], "destroyalias") == 0)
    {
        return command;
    }
    else if (strcmp(command[0], "myHistory") == 0)
    {
        return command;
    }

    for (int i = 0; i < command.size(); i++)
    {
        for (int j = 0; j < alias_table.size(); j++)
        {
            alias_flag = 0;
            if (strcmp(alias_table[j].first, command[i]) == 0)
            {
                alias_flag = 1;
                tokens temp2;
                char *temp = alias_table[j].second;
                temp2 = split_command(temp);
                for (int a = 0; a < temp2.size(); a++)
                {
                    alias_command.push_back(temp2[a]);
                }
                break;
            }
        }
        if (alias_flag == 0)
        {
            alias_command.push_back(command[i]);
        }
        else if (alias_flag == 1)
        {
            continue;
        }
    }
    return alias_command;
}