tools/scripts/wdiff.pl

	wdiff.pl revision 7c478bd95313f5f23a4c958a745db2134aa03244
#!/usr/bin/perl
#
# CDDL HEADER START
#
# The contents of this file are subject to the terms of the
# Common Development and Distribution License, Version 1.0 only
# (the "License").  You may not use this file except in compliance
# with the License.
#
# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
# or http://www.opensolaris.org/os/licensing.
# See the License for the specific language governing permissions
# and limitations under the License.
#
# When distributing Covered Code, include this CDDL HEADER in each
# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
# If applicable, add the following below this CDDL HEADER, with the
# fields enclosed by brackets "[]" replaced with your own identifying
# information: Portions Copyright [yyyy] [name of copyright owner]
#
# CDDL HEADER END
#
#
# ident "%Z%%M% %I% %E% SMI"
#
# Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
# Use is subject to license terms.
#
# Make a dynamic HTML page for the unified diffs between two (C) files.
#

use Getopt::Std;

$diffword = "wdiff";
$context = 10;

getopt('t');

if ($#ARGV + 1 == 1) {
    $diffword = $ARGV[0];
    open DIFF, "<&STDIN";
    $ARGV[0] = '-';
    $ARGV[1] = '-';
} elsif ($#ARGV + 1 == 2) {
    open DIFF, "diff -D $diffword $ARGV[0] $ARGV[1] | expand |";
} else {
    print "Usage: $0 [-t title] file1 file2\n";
    exit 2;
}

$title = $opt_t ? $opt_t : "Differences between $ARGV[0] and $ARGV[1]";

$indiff = 0;
$line1 = 0;
$line2 = 0;
@pretext = ();      # Speculative pretext buffer (code)
$posttext = 0;      # Lines of posttext to print
$nelided = 0;       # Number of elided chunks
$endfunc = 0;       # Seen end of function?
$inelided = 0;      # Elided section open?
$elided_lines = 0;

print <<END;
<html>
  <head>
    <title>$title</title>
    <style type='text/css'>
      pre   { margin: 0; border: 2px solid white }

      .subtracted { color: red }
      .added    { color: blue }

      .elided   { border: 2px solid; cursor: n-resize; padding: 1px }

      .hidebar  { background-color: #cccccc; border: 1px solid black;
              text-align: center;
          border-collapse: separate; border-spacing: 0px; }

      .hidebar .active { border: 2px black outset; cursor: n-resize }

      .cmdbox   { position: fixed; top: 0; right: 0; border: solid 1px black;
              background-color: white; text-align: center }

      .cmdbox td { border: outset #808080; cursor: default; padding: 3px 4px; }

    </style>
    <script>
      function show_n_hide_dir(id_to_show, id_to_hide, dir) {
          var elt_to_show = document.getElementById(id_to_show);
          var elt_to_hide = document.getElementById(id_to_hide);
          // When we're opening up, we need to make the bottoms of the
          // elements appear to be the same.  So our invariant should be
          // elt.offsetBottom - window.scrollY.
          var preinvar = elt_to_hide.offsetHeight - window.scrollY;
          elt_to_show.style.setProperty('display', '', '');
          elt_to_hide.style.setProperty('display', 'none', '');
          if (dir == 'up') {
              var postinvar = elt_to_show.offsetHeight - window.scrollY;
              window.scrollBy(0, postinvar - preinvar);
          }
      }

      function handle_click(e) {
          var eh = e.target;
          var es = document.getElementById("hb-" + e.target.id);
          eh.style.setProperty('display', 'none', '');
          es.style.setProperty('display', '', '');
          /* Scroll so new element is at cursor. */
          window.scroll(0, es.offsetTop + (es.offsetHeight / 2)
              - e.clientY);
      }

      function stripsearch(str) {
    q = str.indexOf("?");
    if (q != -1)
      str = str.substr(0, q);
    return (str);
      }

      function split() {
        page = stripsearch(location.href);
    halfway = window.scrollY + window.innerHeight / 2 - 5;
    document.write('<frameset rows="50%,*">' +
      '<frame src="' + page + "?" + window.scrollY + '" />' +
      '<frame src="' + page + "?" + halfway + '" />' +
      '</frameset>');
    document.close();
      }

      function closeframe() {
    page = stripsearch(location.href);

    otherf = window.parent.frames[0];
    if (otherf == window)
      otherf = window.parent.frames[1];

    parent.location.href = page + "?" + otherf.scrollY;
      }

    </script>
  </head>
  <body>
    <table class='cmdbox'>
      <tr>
        <td onclick='split()'>Split</td>
    <td id='close' onclick='closeframe()'>Close</td>
      </tr>
      <tr><td colspan=2 onclick='open_or_close_all(1)'>Expand all</td></tr>
      <tr><td colspan=2 onclick='open_or_close_all(0)'>Collapse all</td></tr>
    </table>
    <script type='text/javascript'>
      if (window == top)
        document.getElementById('close').style.setProperty('display', 'none', '');
    </script>
END

print "<pre><span class='subtracted'>          --- $ARGV[0]
</span><span class='added'>          +++ $ARGV[1]
</span>";

sub begin_elided {
    ++$nelided;
    # onclick handler assigned at bottom
    print "<pre id='elided$nelided' class='elided' style='display: none'>";
    $inelided = 1;
    $elided_lines = 0;
}

sub end_elided {
    print "</pre>\n";

    print <<END;
<table id='hb-elided$nelided' class='hidebar'>
  <tr>
    <td class='active' onclick='show_n_hide_dir("elided$nelided", "hb-elided$nelided", "down")'>
      Click to open down</td>
    <td style='width: 5em'>$elided_lines lines</td>
    <td class='active' onclick='show_n_hide_dir("elided$nelided", "hb-elided$nelided", "up")'>
      Click to open up</td>
  </tr>
<table>
END
    $inelided = 0;
}

while (<DIFF>) {
    chomp;

    # Change detection
    $previndiff = $indiff;

    if (!$indiff) {
        if (/^#ifdef $diffword$/) {
            $indiff = 1;
        } elsif (/^#ifndef $diffword$/) {
            $indiff = -1;
        }
    } else {
        if (/^#else \/\* $diffword \*\/$/) {
            $indiff = -$indiff;
            print "</span>";
            printf "<span class='%s'>",
                ($indiff > 0 ? "added" : "subtracted");
            next;
        } elsif (/^#endif \/\* (! )?$diffword \*\/$/) {
            $indiff = 0;
            $posttext = $context;
            print "</span>";
            next;
        }
    }

    if (!$previndiff && $indiff) {
        # Beginning of a change: If we have an elided section open,
        # end it.  Print the pretext and continue.

        if ($inelided) {
            end_elided;
            print "<pre>";
        }

        print @pretext;
        @pretext = ();
        $endfunc = 0;
        $infunc = -1;

        printf "<span class='%s'>",
            ($indiff > 0 ? "added" : "subtracted");
        next;
    }

    # Line of code

    # Quote for HTML
    s/&/&amp;/g;
    s/</&lt;/g;
    s/>/&gt;/g;

    # Format the line according to $indiff, and print it or put it into
    # a buffer.
    if ($indiff == -1) {
        ++$line1;
        printf "%4d %4s -%s\n", $line1, "", $_;
    } elsif ($indiff == 0) {
        ++$line1;
        ++$line2;

        $str = sprintf "%4d %4d  %s\n", $line1, $line2, $_;

        if ($posttext > 0) {
            print $str;
            --$posttext;
        } else {
            push @pretext, $str;
            if ($#pretext + 1 > $context) {
                $str = shift @pretext;

                if (!$inelided) {
                    print "</pre>\n";
                    begin_elided;
                }

                ++$elided_lines;

                print $str;
            }
        }
    } elsif ($indiff == 1) {
        ++$line2;
        printf "%4s %4d +%s\n", "", $line2, $_;
    }
}

print @pretext;

if ($inelided) {
    $elided_lines += @pretext;
    end_elided;
} else {
    print "    </pre>\n";
}

print "<pre id='linerefpre'><span id='lineref'>", ' ' x (4 + 1 + 4 + 2 + 80),
    "</span></pre>\n";

print <<END;
    <script>
      /* Assign event handlers and widths. */
      var w = document.getElementById('lineref').offsetWidth;
      for (var i = 1; i <= $nelided; ++i) {
          var e = document.getElementById("elided" + i);
          e.onclick = handle_click;
          e.style.setProperty('width', w, '');

          e = document.getElementById("hb-elided" + i);
          e.style.setProperty('width', w, '');
      }

      /* Hide our line size reference. */
      document.getElementById('linerefpre').style.setProperty('display', 'none', '');

      /* Scroll as indicated. */
      str = location.search;
      s = str.substring(1, str.length);
      if (s > 0)
        window.scroll(0, s);

      function open_or_close_all(open) {
          for (var i = 1; i <= $nelided; ++i) {
              var e = document.getElementById("hb-elided" + i);
              e.style.setProperty("display", open ? "none" : "", "");

              e = document.getElementById("elided" + i);
              e.style.setProperty("display", open ? "" : "none", "");
          }
      }
    </script>
  </body>
</html>
END