/* Normal-format output routines for GNU DIFF.

   Copyright (C) 1988-1989, 1993, 1995, 1998, 2001, 2006, 2009-2013, 2015-2017

   Free Software Foundation, Inc.

   This file is part of GNU DIFF.

   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 3 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, see <http://www.gnu.org/licenses/>.  */

#include "diff.h"

static void print_normal_hunk (struct change *);

/* Print the edit-script SCRIPT as a normal diff.

   INF points to an array of descriptions of the two files.  */

void

print_normal_script (struct change *script)

{

  print_script (script, find_change, print_normal_hunk);

}

/* Print a hunk of a normal diff.

   This is a contiguous portion of a complete edit script,

   describing changes in consecutive lines.  */

static void

print_normal_hunk (struct change *hunk)

{

  lin first0, last0, first1, last1;

  register lin i;

  /* Determine range of line numbers involved in each file.  */

  enum changes changes = analyze_hunk (hunk, &first0, &last0, &first1, &last1);

  if (!changes)

    return;

  begin_output ();

  /* Print out the line number header for this hunk */

  set_color_context (LINE_NUMBER_CONTEXT);

  print_number_range (',', &files[0], first0, last0);

  fputc (change_letter[changes], outfile);

  print_number_range (',', &files[1], first1, last1);

  set_color_context (RESET_CONTEXT);

  fputc ('\n', outfile);

  /* Print the lines that the first file has.  */

  if (changes & OLD)

    {

      if (first0 <= last0)

        set_color_context (DELETE_CONTEXT);

      for (i = first0; i <= last0; i++)

        {

          print_1_line_nl ("<", &files[0].linbuf[i], true);

          if (i == last0)

            set_color_context (RESET_CONTEXT);

          if (files[0].linbuf[i + 1][-1] == '\n')

            putc ('\n', outfile);

        }

    }

  if (changes == CHANGED)

    fputs ("---\n", outfile);

  /* Print the lines that the second file has.  */

  if (changes & NEW)

    {

      if (first1 <= last1)

        set_color_context (ADD_CONTEXT);

      for (i = first1; i <= last1; i++)

        {

          print_1_line_nl (">", &files[1].linbuf[i], true);

          if (i == last1)

            set_color_context (RESET_CONTEXT);

          if (files[1].linbuf[i + 1][-1] == '\n')

            putc ('\n', outfile);

        }

    }

}