svn_diff.h

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 * @c svn_diff_fns_t vtable.
 */
typedef struct svn_diff_output_fns_t
{
  /* Two-way and three-way diffs both call the first two output functions: */

  /**
   * If doing a two-way diff, then an *identical* data range was found
   * between the "original" and "modified" datasources.  Specifically,
   * the match starts at @a original_start and goes for @a original_length
   * tokens in the original data, and at @a modified_start for 
   * @a modified_length tokens in the modified data.
   *
   * If doing a three-way diff, then all three datasources have
   * matching data ranges.  The range @a latest_start, @a latest_length in
   * the "latest" datasource is identical to the range @a original_start,
   * @a original_length in the original data, and is also identical to
   * the range @a modified_start, @a modified_length in the modified data.
   */
  svn_error_t *(*output_common)(void *output_baton,
                                apr_off_t original_start,
                                apr_off_t original_length,
                                apr_off_t modified_start,
                                apr_off_t modified_length,
                                apr_off_t latest_start,
                                apr_off_t latest_length);

  /**
   * If doing a two-way diff, then an *conflicting* data range was found
   * between the "original" and "modified" datasources.  Specifically,
   * the conflict starts at @a original_start and goes for @a original_length
   * tokens in the original data, and at @a modified_start for 
   * @a modified_length tokens in the modified data.
   *
   * If doing a three-way diff, then an identical data range was discovered
   * between the "original" and "latest" datasources, but this conflicts with
   * a range in the "modified" datasource.
   */
  svn_error_t *(*output_diff_modified)(void *output_baton,
                                       apr_off_t original_start,
                                       apr_off_t original_length,
                                       apr_off_t modified_start,
                                       apr_off_t modified_length,
                                       apr_off_t latest_start,
                                       apr_off_t latest_length);

  /* ------ The following callbacks are used by three-way diffs only --- */

  /** An identical data range was discovered between the "original" and
   * "modified" datasources, but this conflicts with a range in the
   * "latest" datasource.
   */
  svn_error_t *(*output_diff_latest)(void *output_baton,
                                     apr_off_t original_start,
                                     apr_off_t original_length,
                                     apr_off_t modified_start,
                                     apr_off_t modified_length,
                                     apr_off_t latest_start,
                                     apr_off_t latest_length);

  /** An identical data range was discovered between the "modified" and
   * "latest" datasources, but this conflicts with a range in the
   * "original" datasource.
   */
  svn_error_t *(*output_diff_common)(void *output_baton,
                                     apr_off_t original_start,
                                     apr_off_t original_length,
                                     apr_off_t modified_start,
                                     apr_off_t modified_length,
                                     apr_off_t latest_start,
                                     apr_off_t latest_length);

  /** All three datasources have conflicting data ranges.  The range
   * @a latest_start, @a latest_length in the "latest" datasource conflicts 
   * with the range @a original_start, @a original_length in the "original" 
   * datasource, and also conflicts with the range @a modified_start, 
   * @a modified_length in the "modified" datasource.
   * If there are common ranges in the "modified" and "latest" datasources
   * in this conflicting range, @a resolved_diff will contain a diff
   * which can be used to retrieve the common and conflicting ranges.
   */
  svn_error_t *(*output_conflict)(void *output_baton,
                                  apr_off_t original_start,
                                  apr_off_t original_length,
                                  apr_off_t modified_start,
                                  apr_off_t modified_length,
                                  apr_off_t latest_start,
                                  apr_off_t latest_length,
                                  svn_diff_t *resolved_diff);
} svn_diff_output_fns_t;


/** Given a vtable of @a output_fns/@a output_baton for consuming
 * differences, output the differences in @a diff.
 */
svn_error_t *
svn_diff_output(svn_diff_t *diff,
                void *output_baton,
                const svn_diff_output_fns_t *output_fns);



/* Diffs on files */

/** A convenience function to produce a diff between two files.
 *
 * Return a diff object in @a *diff (allocated from @a pool) that represents
 * the difference between an @a original file and @a modified file.  
 * (The file arguments must be full paths to the files.)
 */
svn_error_t *
svn_diff_file_diff(svn_diff_t **diff,
                   const char *original,
                   const char *modified,
                   apr_pool_t *pool);


/** A convenience function to produce a diff between three files.
 *
 * Return a diff object in @a *diff (allocated from @a pool) that represents
 * the difference between an @a original file, @a modified file, and @a latest 
 * file. (The file arguments must be full paths to the files.)
 */
svn_error_t *
svn_diff_file_diff3(svn_diff_t **diff,
                    const char *original,
                    const char *modified,
                    const char *latest,
                    apr_pool_t *pool);

/** A convenience function to produce a diff between four files.
 *
 * Return a diff object in @a *diff (allocated from @a pool) that represents
 * the difference between an @a original file, @a modified file, @a latest
 * and @a ancestor file. (The file arguments must be full paths to the files.)
 */
svn_error_t *
svn_diff_file_diff4(svn_diff_t **diff,
                    const char *original,
                    const char *modified,
                    const char *latest,
                    const char *ancestor,
                    apr_pool_t *pool);

/** A convenience function to produce unified diff output from the
 * diff generated by @c svn_diff_file.
 *
 * Output a @a diff between @a original_path and @a modified_path in unified
 * context diff format to @a output_file.  Optionally supply @a original_header
 * and/or @a modified_header to be displayed in the header of the output.
 * If @a original_header or @a modified_header is @c NULL, a default header 
 * will be displayed, consisting of path and last modified time.
 */
svn_error_t *
svn_diff_file_output_unified(svn_stream_t *output_stream,
                             svn_diff_t *diff,
                             const char *original_path,
                             const char *modified_path,
                             const char *original_header,
                             const char *modified_header,
                             apr_pool_t *pool);


/** A convenience function to produce diff3 output from the
 * diff generated by @c svn_diff3_file.
 *
 * Output a @a diff between @a original_path, @a modified_path and
 * @a latest_path in merged format to @a output_file.  Optionally supply
 * @a conflict_modified, @a conflict_original, @a conflict_separator and/or
 * @a conflict_latest to be displayed as conflict markers in the output.
 * If @a conflict_original, @a conflict_modified, @a conflict_latest and/or
 * @a conflict_separator is @c NULL, a default marker will be displayed.
 * Set @a display_original_in_conflict and @a display_resolved_conflicts
 * as desired.  Note that these options are mutually exclusive.
 */
svn_error_t *
svn_diff_file_output_merge(svn_stream_t *output_stream,
                           svn_diff_t *diff,
                           const char *original_path,
                           const char *modified_path,
                           const char *latest_path,
                           const char *conflict_original,
                           const char *conflict_modified,
                           const char *conflict_latest,
                           const char *conflict_separator,
                           svn_boolean_t display_original_in_conflict,
                           svn_boolean_t display_resolved_conflicts,
                           apr_pool_t *pool);


#ifdef __cplusplus
}
#endif /* __cplusplus */

#endif /* SVN_DIFF_H */