Introduction
============

dwdiff is a front-end for the diff program that operates at the word level
instead of the line level. It is different from wdiff in that it allows the
user to specify what should be considered whitespace, and in that it takes an
optional list of characters that should be considered delimiters. Delimiters
are single characters that are treated as if they are words, even when there
is no whitespace separating them from preceding words or delimiters. dwdiff
is mostly commandline compatible with wdiff. Only the --autopager, --terminal
and --avoid-wraps options are not supported.

The default output from dwdiff is the new text, with the deleted and inserted
parts annotated with markers. Command line options are available to change
both what is printed, and the markers.

dwdiff is Licensed under the GNU General Public License version 3. See the file
COPYING for details.

Motivation
==========

I wrote dwdiff because when diff'ing C code with wdiff, wdiff would often find
differences that were larger than I wanted. For example, when one modifies the
function header of a program:

void someFunction(SomeType var)

into

void someFunction(SomeOtherType var)

wdiff would say that "someFunction(SomeType" was replaced by 
"someFunction(SomeOtherType", while what I wanted it to say was that "SomeType"
was replaced by "SomeOtherType".

Prerequisites and installation
==============================

dwdiff is a front-end for diff, so the diff utility should be available. The
configure script will test for -a (assume input is text) and -i (compare case-
insensitively) options. If they are not available (these options are not in
the POSIX specifications) a work-around for the -a option is enabled. The -i
option of dwdiff will be disabled. If a diff command is available that does
provide these options but has a different name, one can set the diff command
to be used by adding --diff=<command> to the configure command-line.

There are two ways in which to compile dwdiff:

Using the configure script:
---

$ ./configure
or
$ ./configure --prefix=/usr
(see ./configure --help for more tuning options)
$ make all
$ make install
(assumes working install program)

Manually editing the Makefile to suit your computer:
---

$ cp Makefile.in Makefile
Edit the values for GETTEXTFLAGS, GETTEXTLIBS, LOCALEDIR, DIFF, DIFF_FLAGS,
LINGUAS and prefix
$ make all
$ make install
(assumes working install program)

The Makefile.in in the distribution should work on all POSIX compatible make's.
I have tested it with both GNU make and BSD make.

dwdiff uses several POSIX functions, namely: popen, pclose, umask, mkstemp and
fdopen. dwdiff should compile on any Un*x system that provides these functions.

Reporting bugs
==============

If you think you have found a bug, please check that you are using the latest 
version of dwdiff [http://os.ghalkes.nl/dwdiff]. When reporting bugs, please
include a minimal example that demonstrates the problem.

Author
======

Gertjan Halkes <dwdiff@ghalkes.nl>

Language files were contributed by the authors named in them.

