#include "path.h"

namespace ov4
{

using namespace std;

string find_cmd(const char * s)
{
    const string tmp = s;
    return find_cmd(tmp);
}

string find_cmd(const string &s)
{
    string unified = path_unifier(s, true);
    LOG << unified << endl;
    return unified;
}

string path_unifier(const string &s, bool is_cmd)
{
    if (s.size() == 0) return "";

    if (s[0] == '/') return s;
    if (s[0] == '.')
    {
        return get_current_dir() + s.substr(1);
    }

    // single word, use path
    if (is_cmd && (s.find("/") == string::npos))
    {
        string path = getenv("PATH");
        size_t i = 0, j = 0, l = path.size();
        while (true)
        {
            for (; j < l; j++)
                if (path[j] == ':')
                    break;
            
            string cmd = path.substr(i, j-i) + '/' +s;
            if (access(cmd.c_str(), F_OK) == 0)
                return cmd;

            if (j == l)
                return "";

            j++;
            i=j;

        }
    }

    return get_current_dir() + "/" + s;

}

int set_current_dir(const string &s)
{
    return chdir(s.c_str());
}

string get_current_dir()
{
    char buf[MAXLINE];
    return (string)(getcwd(buf, MAXLINE));
}


}