AutoPlaylist.cpp

/*
 *
 *      Copyright (C) 2020 Michael J. Walsh
 *
 * 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 <string>
#include <vector>
#include <algorithm>
#include <locale>

#include <dirent.h>

#include "utils/RegExp.h"
#include "AutoPlaylist.h"

using namespace std;

void AutoPlaylist::readPlaylist(string &filename)
{
  // reset object
  playlist_pos = -1;
  playlist.clear();
  dirname.clear();

  int pos = filename.find_last_of('/');
  dirname = filename.substr(0, pos+1); // including trailing slash
  string basename = filename.substr(pos+1);

  DIR *dir = opendir(dirname.c_str());
  if (!dir) {
    puts("Failed to open playlist directory for reading");
    return;
  }

  // re for filename match
  CRegExp fnameext_match("\\.(3g2|3gp|amv|asf|avi|drc|f4a|f4b|f4p|f4v|flv|"
    "m2ts|m2v|m4p|m4v|mkv|mov|mp2|mp4|mpe|mpeg|mpg|mpv|mts|mxf|nsv|ogg|"
    "ogv|qt|rm|rmvb|roq|svi|ts|vob|webm|wmv|yuv|iso|dmg)$");

  // Quit if file being played doesn't have one of the above filename extensions
  if(fnameext_match.RegFind(basename, 0) == -1) {
    puts("Disabling playlist as filename extension not recognised");
    return;
  }

  struct dirent *ent;
  while ((ent = readdir(dir))) {
    if(ent->d_type != DT_DIR && ent->d_name[0] != '.' &&
        fnameext_match.RegFind(ent->d_name, 0) > -1) {

      playlist.push_back(ent->d_name);
    }
  }
  closedir(dir);

  // In English and most other European langauges, this should sort by lower case without
  // regard to diacritics
  const locale loc = locale("");
  sort(playlist.begin(), playlist.end(), loc);

  // search for file we started with
  for(uint i = 0; i < playlist.size(); i++) {
    if(playlist[i] == basename) {
      playlist_pos = i;
      return;
    }
  }

  // strange error
  puts("Weird error");
  playlist.clear();
}

bool AutoPlaylist::ChangeFile(int delta, string &filename)
{
  int npos = playlist_pos + delta;
  int last_index = playlist.size() - 1;

  if(npos < 0 || npos > last_index)
    return false;

  playlist_pos = npos;

  filename = dirname + playlist[playlist_pos];
  return true;
}