//
// aegis - project change supervisor
// Copyright (C) 2013 Peter Miller
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 3 of the License, or (at
// your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program. If not, see <http://www.gnu.org/licenses/>.
//

#include <common/ac/unistd.h>
#include <vector>

#include <common/arglex.h>
#include <common/error.h>
#include <common/nstring.h>
#include <common/nstring/accumulator.h>

#include <ae/exe.h>
#include <ae/usage.h>


void
exe(const char *cmd)
{
    exe(cmd, 0);
}


void
exe(const char *cmd, const char *arg)
{
    exe(cmd, arg, 0);
}


void
exe(const char *cmd, const char *arg1, const char *arg2)
{
    std::vector<nstring> args;
    args.push_back(cmd);
    if (arg1 && *arg1)
        args.push_back(arg1);
    if (arg2 && *arg2)
        args.push_back(arg2);
    for (;;)
    {
        switch (arglex_get_string())
        {
        case arglex_token_string:
            args.push_back(arglex_value.alv_string);
            continue;

        default:
            usage();
            // NOTREACHED

        case arglex_token_eoln:
            break;
        }
        break;
    }

    {
        nstring_accumulator acc;
        acc.push_back(args[0].quote_shell());
        for (size_t j = 1; j < args.size(); ++j)
        {
            acc.push_back(' ');
            acc.push_back(args[j].quote_shell());
        }
        error_raw("%s", acc.mkstr().c_str());
    }

    unsigned argc = args.size();
    char **argv = new char * [argc + 1];
    argv[argc] = 0;
    for (size_t j = 0; j < argc; ++j)
        argv[j] = (char *)args[j].c_str();
    execvp(cmd, argv);
    nfatal("exec(%s, ...)", nstring(cmd).quote_c().c_str());
    delete [] argv;
}


// vim: set ts=8 sw=4 et :