package com.aragost.javahg.internals;
   
   import java.io.File;
   import java.util.Map;
   
   import com.aragost.javahg.Repository;
   import com.google.common.annotations.VisibleForTesting;
   import com.google.common.collect.Maps;
   
  public class CopyRenameHelper {
  
      public static Map<File, File> parse(Repository repo, File[] files, LineIterator output, String prefix){
          Map<File, File> result = Maps.newHashMap();
  
          // Make all files relative to repository
          for (int i = 0; i < files.length; i++) {
              File file = files[i];
              files[i] = repo.relativeFile(file);
          }
  
          int currentSrc = 0;
          File src = files[currentSrc];
          for (String line : output) {
              if (line.startsWith(prefix)) {
                  if (!line.substring(prefix.length()).startsWith(src.getPath())) {
                      currentSrc++;
                      src = files[currentSrc];
                  }
                  String[] names = CopyRenameHelper.parseCopyLine(line, prefix);
  
                  if (names != null) {
                  	result.put(new File(names[1]), new File(names[0]));
                  }
              } else {
                  throw new UnexpectedCommandOutputException("could not parse '" + line + "'");
              }
          }
          return result;
  
      }
      
      @VisibleForTesting
      public static String[] parseCopyLine(String line, String prefix) {
          line = line.substring(prefix.length()).trim();
  
          int nCut = line.indexOf(" to ");
  
          if (nCut < 0) {
          	return null;
          }
  
          return new String[] { line.substring(0, nCut), line.substring(nCut + 4)};
      }
  
  }