.ig \"-*- nroff -*-
Copyright (C) 2004, 2005 Free Software Foundation, Inc.

This file is part of the gdiffmk utility, which is part of groff.
Written by Mike Bianchi <MBianchi@Foveal.com <mailto:MBianchi@Foveal.com>>

Permission is granted to make and distribute verbatim copies of
this manual provided the copyright notice and this permission notice
are preserved on all copies.

Permission is granted to copy and distribute modified versions of this
manual under the conditions for verbatim copying, provided that the
entire resulting derived work is distributed under the terms of a
permission notice identical to this one.

Permission is granted to copy and distribute translations of this
manual into another language, under the above conditions for modified
versions, except that this permission notice may be included in
translations approved by the Free Software Foundation instead of in
the original English.
..
.
.do mso www.tmac
.
.TH GDIFFMK @MAN1EXT@ "@MDATE@" "Groff Version @VERSION@"
.
.
.SH NAME
gdiffmk \- mark differences between groff/nroff/troff files
.
.
.SH SYNOPSIS
.nr a \n(.j
.ad l
.nr i \n(.i
.in +\w'\fBgdiffmk 'u
.ti \niu   
.B gdiffmk
.de OP
.  ie \\n(.$-1 .RI "[\ \fB\\$1\fP" "\\$2" "\ ]"
.  el .RB "[\ " "\\$1" "\ ]"
..
.OP \-a \%addmark
.OP \-c \%changemark
.OP \-d \%deletemark
[\ \c
.B \-D
.OP \-B
.OP \-M "mark1 mark2"
]
.OP \-x \%diffcmd
.OP \-\-
.OP \-\-help
.OP \%\-\-version
.I \%file1
.I \%file2
[\ \c
.IR \%output \ \c
]
.br
.ad \na
.
.
.SH DESCRIPTION
.B gdiffmk
compares two
.BR groff (1),
.BR nroff (1),
or
.BR troff (1)
documents,
.I file1
and
.IR file2 ,
and creates an output which is
.I file2
with added `margin character' (.mc) commands that indicate the differences.
.
.LP
If the
.I output
filename is present,
the output is written there.
If it is
.B \-
or absent the output is written to the standard output.
.
.LP
If the
.I file1
or
.I file2
argument is
.B \-
the standard input is read for that input.
Clearly both cannot be
.BR \- .
.
.LP
Note that the output is not necessarily compatible with all macro packages
and all preprocessors.
See the
.B BUGS
section below.
.
.
.SH OPTIONS
.TP
.BI \-a addmark
Use the
.I addmark
for source lines not in
.I file1
but present in
.IR file2 .
Default:
.BR + .
.
.TP
.B \-B
By default, the deleted texts marked by the
.B \-D
option end
with an added troff break command,
.BR .br ,
to ensure that the deletions are marked properly.
This is the only way to guarantee that deletions and small
changes get flagged.
This option directs the program not to insert these breaks; it makes no
sense to use it without
.BR \-D .
.
.TP
.BI \-c changemark
Use the
.I changemark
for changed source lines.
Default:
.BR | .
.
.TP
.BI \-d deletemark
Use the
.I deletemark
for deleted source lines.
Default:
.BR * .
.
.TP
.B \-D
Show the deleted portions from changed and deleted text.
Default delimiting marks:
.BR "[[" " .\&.\&.\&. " "]]" .
.
.TP
.BI \-M "mark1 mark2"
Change the delimiting marks for the
.B \-D
option.
It makes no sense to use this option without
.BR \-D .
.
.TP
.BI \-x diffcmd
Use the
.I diffcmd
command to perform the comparison of
.I file1
and
.IR file2 .
In particular,
.I diffcmd
should accept the GNU
.B diff
.BI \-D name
option.
Default:
.BR diff (1).
.
.TP
.B \-\-
All the following arguments are treated as file names,
even if they begin with
.BR \- .
.
.TP
.B \-\-help
Print a usage message on standard error output and exit.
.
.TP
.B \-\-version
Print version information on the standard output and exit.
.
.
.SH BUGS
The output is not necessarily compatible with all macro packages
and all preprocessors.
A workaround that is often successful against preprocessor problems
is to run
.B gdiffmk
on the output of all the preprocessors instead of the input source.
.
.LP
.B gdiffmk
relies on the
.BI \-D name
option of GNU
.BR diff (1)
to make a merged `#ifdef' output format.
It hasn't been tested whether other versions of
.BR diff (1)
do support this option.
See also the
.BI \-x diffcmd
option.
.
.LP
Report bugs to bug-groff@gnu.org.
Include a complete, self-contained example that will allow the bug to
be reproduced, and say which version of
.B gdiffmk
you are using.
.
.
.SH AUTHORS
This document was written and is maintained by
.MTO MBianchi@Foveal.com "Mike Bianchi" .
.
.LP
This document is distributed under the terms of the FDL (GNU Free
Documentation License) version 1.1 or later.
You should have received a copy of the FDL on your system, it is also
available on-line at the
.URL http://\:www.gnu.org/\:copyleft/\:fdl.html "GNU copyleft site" .
.
.LP
.B gdiffmk
is part of the
.I groff
GNU free software project.
All parts of the
.I groff package
are protected by GNU copyleft licenses.
The software files are distributed under the terms of the GNU General
Public License (GPL), while the documentation files mostly use the GNU
Free Documentation License (FDL).
.
.
.SH COPYRIGHT
Copyright \(co 2004, 2005 Free Software Foundation, Inc.
.
.LP
.B gdiffmk
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.
.
.LP
.B gdiffmk
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.
.
.LP
You should have received a copy of the GNU General Public License along
with groff; see the file COPYING.
If not, write to the Free Software
Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301, USA.
.
.
.SH "SEE ALSO"
.BR groff (@MAN1EXT@),
.BR nroff (@MAN1EXT@),
.BR gtroff (@MAN1EXT@),
.BR diff (@MAN1EXT@)
.
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