Git.h

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// This may look like C code, but it's really -*- C++ -*-
/*
 * Copyright (C) 2008 Emweb bv, Herent, Belgium.
 *
 * See the LICENSE file for terms of use.
 */
#ifndef GIT_H_
#define GIT_H_

#include <stdexcept>
#include <list>
#include <boost/array.hpp>
#include <string>


class Git {
public:
  class Exception : public std::runtime_error {
  public:
    Exception(const std::string& msg);
  };

  class ObjectId : public boost::array<unsigned char, 20> {
  public:
    ObjectId();

    explicit ObjectId(const std::string& id);

    std::string toString() const;
  };

  enum ObjectType { Tree, Commit, Blob };

  struct Object {
    ObjectId    id;
    ObjectType  type;
    std::string name;

    Object(const ObjectId& id, ObjectType type);
  };

  Git();

  void setRepositoryPath(const std::string& repository);

  ObjectId getCommitTree(const std::string& revision) const;

  ObjectId getCommit(const std::string& revision) const;

  ObjectId getTreeFromCommit(const ObjectId& commit) const;

  Object   treeGetObject(const ObjectId& tree, int index) const;

  int      treeSize(const ObjectId& tree) const;

  std::string catFile(const ObjectId& id) const;

  typedef std::list<std::pair<std::string, std::string> > Cache;

private:
  std::string repository_;

  mutable Cache cache_;

  void checkRepository() const;

  bool getCmdResult(const std::string& cmd, std::string& result,
                    const std::string& tag) const;

  bool getCmdResult(const std::string& cmd, std::string& result,
                    int index) const;

  int getCmdResultLineCount(const std::string& cmd) const;
};

#endif // GIT_H_