#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <iostream>

#include <boost/optional.hpp>

#include "git2cpp/threads_initializer.h"

#include "git2cpp/repo.h"

using namespace git;

static void usage(const char *message, const char *arg)

{

if (message && arg)

fprintf(stderr, "%s: %s\n", message, arg);

else if (message)

fprintf(stderr, "%s\n", message);

fprintf(stderr, "usage: rev-parse [ --option ] <args>...\n");

exit(1);

}

struct parse_state {

boost::optional<Repository> repo;

std::string repodir = ".";

};

void parse_revision(parse_state & ps, const char *revstr)

{

if (!ps.repo)

ps.repo = boost::in_place(ps.repodir);

Revspec rs = ps.repo->revparse(revstr);

if (auto commit = rs.single())

{

std::cout << id_to_str(commit->id()) << std::endl;

}

else

{

auto const & range = *rs.range();

std::cout << id_to_str(range.to.id()) << std::endl;

if ((rs.flags() & GIT_REVPARSE_MERGE_BASE) != 0) {

git_oid base = ps.repo->merge_base(range);

std::cout << id_to_str(&base) << std::endl;

}

std::cout << "^" << id_to_str(range.from.id()) << std::endl;

}

}

int main(int argc, char *argv[])

{

parse_state ps;

ThreadsInitializer threads_initalizer;

for (int i = 1; i < argc; ++i) {

const char * a = argv[i];

if (a[0] != '-')

parse_revision(ps, a);

else if (!strncmp(a, "--git-dir=", strlen("--git-dir=")))

ps.repodir = a + strlen("--git-dir=");

else

usage("Cannot handle argument", a);

}

return 0;

}