source: vendor/diffutils/2.8.1/src/diff.h@ 2859

/* Shared definitions for GNU DIFF

   Copyright (C) 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1998, 2001,
   2002 Free Software Foundation, Inc.

   This file is part of GNU DIFF.

   GNU DIFF 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, or (at your option)
   any later version.

   GNU DIFF 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; see the file COPYING.
   If not, write to the Free Software Foundation,
   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#include "system.h"
#include <stdio.h>

#define TAB_WIDTH 8

/* What kind of changes a hunk contains.  */
enum changes
{
  /* No changes: lines common to both files.  */
  UNCHANGED,

  /* Deletes only: lines taken from just the first file.  */
  OLD,

  /* Inserts only: lines taken from just the second file.  */
  NEW,

  /* Both deletes and inserts: a hunk containing both old and new lines.  */
  CHANGED
};


/* Variables for command line options */

#ifndef GDIFF_MAIN
# define XTERN extern
#else
# define XTERN
#endif

enum output_style
{
  /* No output style specified.  */
  OUTPUT_UNSPECIFIED,

  /* Default output style.  */
  OUTPUT_NORMAL,

  /* Output the differences with lines of context before and after (-c).  */
  OUTPUT_CONTEXT,

  /* Output the differences in a unified context diff format (-u).  */
  OUTPUT_UNIFIED,

  /* Output the differences as commands suitable for `ed' (-e).  */
  OUTPUT_ED,

  /* Output the diff as a forward ed script (-f).  */
  OUTPUT_FORWARD_ED,

  /* Like -f, but output a count of changed lines in each "command" (-n).  */
  OUTPUT_RCS,

  /* Output merged #ifdef'd file (-D).  */
  OUTPUT_IFDEF,

  /* Output sdiff style (-y).  */
  OUTPUT_SDIFF
};

/* True for output styles that are robust,
   i.e. can handle a file that ends in a non-newline.  */
#define ROBUST_OUTPUT_STYLE(S) ((S) != OUTPUT_ED && (S) != OUTPUT_FORWARD_ED)

XTERN enum output_style output_style;

/* Nonzero if output cannot be generated for identical files.  */
XTERN bool no_diff_means_no_output;

/* Number of lines of context to show in each set of diffs.
   This is zero when context is not to be shown.  */
XTERN lin context;

/* Consider all files as text files (-a).
   Don't interpret codes over 0177 as implying a "binary file".  */
XTERN bool text;

/* Number of lines to keep in identical prefix and suffix.  */
XTERN lin horizon_lines;

/* The significance of white space during comparisons.  */
XTERN enum
{
  /* All white space is significant (the default).  */
  IGNORE_NO_WHITE_SPACE,

  /* Ignore changes due to tab expansion (-E).  */
  IGNORE_TAB_EXPANSION,

  /* Ignore changes in horizontal white space (-b).  */
  IGNORE_SPACE_CHANGE,

  /* Ignore all horizontal white space (-w).  */
  IGNORE_ALL_SPACE
} ignore_white_space;

/* Ignore changes that affect only blank lines (-B).  */
XTERN bool ignore_blank_lines;

/* Files can be compared byte-by-byte, as if they were binary.
   This depends on various options.  */
XTERN bool files_can_be_treated_as_binary;

/* Ignore differences in case of letters (-i).  */
XTERN bool ignore_case;

/* Ignore differences in case of letters in file names.  */
XTERN bool ignore_file_name_case;

/* File labels for `-c' output headers (--label).  */
XTERN char *file_label[2];

/* Regexp to identify function-header lines (-F).  */
XTERN struct re_pattern_buffer function_regexp;

/* Ignore changes that affect only lines matching this regexp (-I).  */
XTERN struct re_pattern_buffer ignore_regexp;

/* Say only whether files differ, not how (-q).  */
XTERN bool brief;

/* Expand tabs in the output so the text lines up properly
   despite the characters added to the front of each line (-t).  */
XTERN bool expand_tabs;

/* Use a tab in the output, rather than a space, before the text of an
   input line, so as to keep the proper alignment in the input line
   without changing the characters in it (-T).  */
XTERN bool initial_tab;

/* Remove trailing carriage returns from input.  */
XTERN bool strip_trailing_cr;

/* In directory comparison, specify file to start with (-S).
   This is used for resuming an aborted comparison.
   All file names less than this name are ignored.  */
XTERN char const *starting_file;

/* Pipe each file's output through pr (-l).  */
XTERN bool paginate;

/* Line group formats for unchanged, old, new, and changed groups.  */
XTERN char const *group_format[CHANGED + 1];

/* Line formats for unchanged, old, and new lines.  */
XTERN char const *line_format[NEW + 1];

/* If using OUTPUT_SDIFF print extra information to help the sdiff filter.  */
XTERN bool sdiff_merge_assist;

/* Tell OUTPUT_SDIFF to show only the left version of common lines.  */
XTERN bool left_column;

/* Tell OUTPUT_SDIFF to not show common lines.  */
XTERN bool suppress_common_lines;

/* The half line width and column 2 offset for OUTPUT_SDIFF.  */
XTERN unsigned int sdiff_half_width;
XTERN unsigned int sdiff_column2_offset;

/* String containing all the command options diff received,
   with spaces between and at the beginning but none at the end.
   If there were no options given, this string is empty.  */
XTERN char *switch_string;

/* Use heuristics for better speed with large files with a small
   density of changes.  */
XTERN bool speed_large_files;

/* Patterns that match file names to be excluded.  */
XTERN struct exclude *excluded;