shortpath.cc

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/*
    Copyright (C) 2000-2007 Paul Davis 

    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 2 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, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#include <stdint.h>
#include "pbd/shortpath.h"

using namespace Glib;
using namespace std;

ustring
short_path (const Glib::ustring& path, ustring::size_type target_characters)
{
        ustring::size_type last_sep;
        ustring::size_type len = path.length();
        const char separator = '/';

        if (len <= target_characters) {
                return path;
        }

        if ((last_sep = path.find_last_of (separator)) == ustring::npos) {

                /* just a filename, but its too long anyway */

                if (target_characters > 3) {
                        return path.substr (0, target_characters - 3) + ustring ("...");
                } else {
                        /* stupid caller, just hand back the whole thing */
                        return path;
                }
        }

        if (len - last_sep >= target_characters) {

                /* even the filename itself is too long */

                if (target_characters > 3) {
                        return path.substr (last_sep+1, target_characters - 3) + ustring ("...");
                } else {
                        /* stupid caller, just hand back the whole thing */
                        return path;
                }
        }
        
        uint32_t so_far = (len - last_sep);
        uint32_t space_for = target_characters - so_far;

        if (space_for >= 3) {
                ustring res = "...";
                res += path.substr (last_sep - space_for);
                return res;
        } else {
                /* remove part of the end */
                ustring res = "...";
                res += path.substr (last_sep - space_for, len - last_sep + space_for - 3);
                res += "...";
                return res;
                
        }
}