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README

This is now looking a LOT more like the standard "diff" utility.  There
are a few features missing (e.g. we can't do directory diffs), but apart
from that, it seems to work.

The major changes in this version are:

	- We now accept command-line options.  In particular, we
	  recognise all options that are accepted by GNU diff,
	  though some of them result in error reports and a few
	  which have do nothing to do with the output format or
	  semantics, but are merely for efficiency, are accepted
	  and ignored.

	- We support different output formats, in particular all
	  of the output formats supported by GNU diff. There are
	  a number of modifiers to the output formats (for example,
	  --show-function-line) which we don't yet support.

	- We have a new diff algorithm, based on the one by Eugene
	  Myers.  See myers.m for details.

	- Just about everything has been modified to support the
	  above changes.

	- Lots of cleanups, lots more documentation.

Examine the file TODO to see what's still missing.

Andrew Bromage  13 September 1998

===========================================================================

The version which appears here is a re-hacked version of Marnix Klooster's
hacked version of my original.  Special thanks to him for making my code
a lot more maintainable than it originally was.  :-)

The changes from the previous version:

	- Bug fix for a problem which was causing it to bomb out if
	  the two files were identical.

	- Changed indenting so it more closely matches the Mercury
	  compiler coding standard.

	- Update to use unique arrays (now called array.m).

	- Various minor documentation tweaks.

Oh, and it still runs in nowhere near the speed of GNU diff.

Andrew Bromage  28 Jul 1997

===========================================================================

The Mercury modules in this directory have been derived from the
'diff' sample distributed with Mercury 0.6.  That sample carries the
following copyright information, description and to-do list (in
diff.m):


%-----------------------------------------------------------------------------%
% Copyright (C) 1995 The University of Melbourne.
% This file may only be copied under the terms of the GNU General
% Public License - see the file COPYING in the Mercury distribution.
%-----------------------------------------------------------------------------%

% File: diff.m
% Main author: bromage

% Something very similar to the standard diff utility.  Sort of.  :-)

% On the still-to-do list:
%	- Add command-line options.  Probably:
%		--ignore-all-space
%		--ignore-blank-lines
%		--ignore-case
%		--rcs
%	  What others are easy and don't break up the code?


The major changes I made were

* Moved code for manipulating and displaying diffs to a separate
  module called diffs.m (and changed their calls in diff.m).  The type
  'lcss,' needed both by the rest of lcss.m and by diffs.m, was moved
  to a new module lcsstype.m.

* Made lcss.m independent of files, and allowed it to process any kind
  of list by adding polymorphism.  (The file processing calls have
  been moved to diff.m.)

* Added type synonyms 'pos' and 'segment' in diffs.m to clarify the
  types.  Renamed 'single_diff' to 'edit'.

* Added end-of-file match to the generated lcss, thereby allowing the
  to_diff predicate to be simplified considerably.

* Numbered lists from 0 internally in the lcss-algorithm.  This made
  to_diff simpler still, but also forced changes in the diff-printing
  part.

* Removed the swapping in find_lcss, because it doesn't seem to help.

* The array(string) representing a file in file.m was also renumbered
  to begin with 0.

* Added and corrected comments.

Have fun,

 <><

Marnix
--
Marnix Klooster
marnix@worldonline.nl

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