HbookName.h

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/***********************************************************************************\
* (c) Copyright 1998-2019 CERN for the benefit of the LHCb and ATLAS collaborations *
*                                                                                   *
* This software is distributed under the terms of the Apache version 2 licence,     *
* copied verbatim in the file "LICENSE".                                            *
*                                                                                   *
* In applying this licence, CERN does not waive the privileges and immunities       *
* granted to it by virtue of its status as an Intergovernmental Organization        *
* or submit itself to any jurisdiction.                                             *
\***********************************************************************************/
#ifndef GAUDIALG_HBOOKNAME_H
#define GAUDIALG_HBOOKNAME_H 1
// Include files
#include <algorithm>
#include <string>
 
namespace {
  inline std::string dirHbookName( const std::string& addr, const int maxLen = 16 ) {
    // ignore empty locations
    if ( addr.empty() ) { return std::string(); }
    //
    std::string old( addr );
    // remove long names
    if ( 0 < maxLen && maxLen < (int)old.size() ) {
      auto       p1 = old.begin();
      const char sep( '/' );
      while ( old.end() != p1 ) {
        p1      = std::find_if( p1, old.end(), [&]( const char& c ) { return c != sep; } );
        auto p2 = std::find( p1, old.end(), sep );
        if ( ( p2 - p1 ) <= (int)maxLen ) {
          p1 = p2;
          continue;
        }
        old.insert( p1 + maxLen, sep );
        p1 = old.begin();
      }
    }
    return old;
  }
 
} // end of anonymous namespace
 
// ============================================================================
// The END
// ============================================================================
#endif // GAUDIALG_HBOOKNAME_H