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src/subversion/subversion/libsvn_wc/conflicts.c  view on Meta::CPAN

      const char *file_name;

      SVN_ERR(svn_io_write_unique(&file_name, dirpath, working_val->data,
                                  working_val->len,
                                  svn_io_file_del_on_pool_cleanup,
                                  scratch_pool));
      cdesc->my_abspath = svn_dirent_join(dirpath, file_name, scratch_pool);
    }

  if (incoming_new_val)
    {
      const char *file_name;

      SVN_ERR(svn_io_write_unique(&file_name, dirpath, incoming_new_val->data,
                                  incoming_new_val->len,
                                  svn_io_file_del_on_pool_cleanup,
                                  scratch_pool));
      cdesc->their_abspath = svn_dirent_join(dirpath, file_name, scratch_pool);
    }

  if (!base_val && !incoming_old_val)
    {
      /* If base and old are both NULL, then that's fine, we just let
         base_file stay NULL as-is.  Both agents are attempting to add a
         new property.  */
    }

  else if ((base_val && !incoming_old_val)
           || (!base_val && incoming_old_val))
    {
      /* If only one of base and old are defined, then we've got a
         situation where one agent is attempting to add the property
         for the first time, and the other agent is changing a
         property it thinks already exists.  In this case, we return
         whichever older-value happens to be defined, so that the
         conflict-callback can still attempt a 3-way merge. */

      const svn_string_t *conflict_base_val = base_val ? base_val
                                                       : incoming_old_val;
      const char *file_name;

      SVN_ERR(svn_io_write_unique(&file_name, dirpath,
                                  conflict_base_val->data,
                                  conflict_base_val->len,
                                  svn_io_file_del_on_pool_cleanup,
                                  scratch_pool));
      cdesc->base_abspath = svn_dirent_join(dirpath, file_name, scratch_pool);
    }

  else  /* base and old are both non-NULL */
    {
      const svn_string_t *conflict_base_val;
      const char *file_name;

      if (! svn_string_compare(base_val, incoming_old_val))
        {
          /* What happens if 'base' and 'old' don't match up?  In an
             ideal situation, they would.  But if they don't, this is
             a classic example of a patch 'hunk' failing to apply due
             to a lack of context.  For example: imagine that the user
             is busy changing the property from a value of "cat" to
             "dog", but the incoming propchange wants to change the
             same property value from "red" to "green".  Total context
             mismatch.

             HOWEVER: we can still pass one of the two base values as
             'base_file' to the callback anyway.  It's still useful to
             present the working and new values to the user to
             compare. */

          if (working_val && svn_string_compare(base_val, working_val))
            conflict_base_val = incoming_old_val;
          else
            conflict_base_val = base_val;
        }
      else
        {
          conflict_base_val = base_val;
        }

      SVN_ERR(svn_io_write_unique(&file_name, dirpath, conflict_base_val->data,
                                  conflict_base_val->len,
                                  svn_io_file_del_on_pool_cleanup, scratch_pool));
      cdesc->base_abspath = svn_dirent_join(dirpath, file_name, scratch_pool);

      if (working_val && incoming_new_val)
        {
          svn_stream_t *mergestream;
          svn_diff_t *diff;
          svn_diff_file_options_t *options =
            svn_diff_file_options_create(scratch_pool);

          SVN_ERR(svn_stream_open_unique(&mergestream, &cdesc->merged_file,
                                         NULL, svn_io_file_del_on_pool_cleanup,
                                         scratch_pool, scratch_pool));
          SVN_ERR(svn_diff_mem_string_diff3(&diff, conflict_base_val,
                                            working_val,
                                            incoming_new_val, options, scratch_pool));
          SVN_ERR(svn_diff_mem_string_output_merge2
                  (mergestream, diff, conflict_base_val, working_val,
                   incoming_new_val, NULL, NULL, NULL, NULL,
                   svn_diff_conflict_display_modified_latest, scratch_pool));
          SVN_ERR(svn_stream_close(mergestream));
        }
    }

  if (!incoming_old_val && incoming_new_val)
    cdesc->action = svn_wc_conflict_action_add;
  else if (incoming_old_val && !incoming_new_val)
    cdesc->action = svn_wc_conflict_action_delete;
  else
    cdesc->action = svn_wc_conflict_action_edit;

  if (base_val && !working_val)
    cdesc->reason = svn_wc_conflict_reason_deleted;
  else if (!base_val && working_val)
    cdesc->reason = svn_wc_conflict_reason_obstructed;
  else
    cdesc->reason = svn_wc_conflict_reason_edited;

  /* Invoke the interactive conflict callback. */