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Estimated hours taken: 30 Modified files -------------- samples/diff/README: Info about this new version. Put the existing READMEs in reverse order, so that they'll be in the most sensible order for someone reading top-down. samples/diff/Mmakefile: Supply more detail about which bit of this program GCC 2.7.2 under Digital Unix 3.2 doesn't compile properly. samples/diff/diff.m: Slight reorganisation. Accept options, remove some high coupling betweem diff__do_diff and lcss.m. samples/diff/file.m: Add support for attaching a filename to a file. samples/diff/lcss.m: Add more documentation, one slight performance improvement. lcss__to_diff now works on the reversed LCSS, to avoid going to the trouble of reversing it. New files --------- samples/diff/TODO: Meaning should be obvious. samples/diff/diff_out.m: Replacement for diffs.m (which was never a very good name). Now contains code to display a diff in lots more output styles than previously supported. samples/diff/difftype.m: Replacement for lcsstype.m. Contains the type of a diff (but not of an lcss, which is now local to lcss.m, hence the renaming). samples/diff/filter.m: Contains code to filter a diff before being displayed. This is only required if the user specified that they didn't want to see part of the diff (e.g. with --ignore-blank-lines). samples/diff/globals.m: samples/diff/options.m: Support for option handling. Removed files ------------- samples/diff/diffs.m: Functionality moved to diff_out.m. samples/diff/lcsstype.m: Functionality moved to difftype.m.
116 lines
3.6 KiB
Plaintext
116 lines
3.6 KiB
Plaintext
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This is now looking a LOT more like the standard "diff" utility. There
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are a few features missing (e.g. we can't do directory diffs), but apart
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from that, it seems to work.
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The major changes in this version are:
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- We now accept command-line options. In particular, we
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recognise all options that are accepted by GNU diff,
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though a lot of them result in error reports and a few
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which have do nothing to do with the output format or
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semantics, but are merely for efficiency, are accepted
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and ignored.
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- We support different output formats, in particular all
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of the output formats supported by GNU diff. There are
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a number of modifiers to the output formats (for example,
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--expand-tabs) which we don't yet support.
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- Just about everything (except the actual diff algorithm)
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has been modified to support the above changes.
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- Lots of cleanups, lots more documentation.
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Examine the file TODO to see what's still missing.
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Andrew Bromage 8 Jan 1998
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===========================================================================
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The version which appears here is a re-hacked version of Marnix Klooster's
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hacked version of my original. Special thanks to him for making my code
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a lot more maintainable than it originally was. :-)
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The changes from the previous version:
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- Bug fix for a problem which was causing it to bomb out if
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the two files were identical.
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- Changed indenting so it more closely matches the Mercury
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compiler coding standard.
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- Update to use unique arrays (now called array.m).
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- Various minor documentation tweaks.
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Oh, and it still runs in nowhere near the speed of GNU diff.
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Andrew Bromage 28 Jul 1997
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===========================================================================
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The Mercury modules in this directory have been derived from the
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'diff' sample distributed with Mercury 0.6. That sample carries the
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following copyright information, description and to-do list (in
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diff.m):
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%-----------------------------------------------------------------------------%
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% Copyright (C) 1995 The University of Melbourne.
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% This file may only be copied under the terms of the GNU General
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% Public License - see the file COPYING in the Mercury distribution.
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%-----------------------------------------------------------------------------%
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% File: diff.m
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% Main author: bromage
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% Something very similar to the standard diff utility. Sort of. :-)
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% On the still-to-do list:
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% - Add command-line options. Probably:
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% --ignore-all-space
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% --ignore-blank-lines
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% --ignore-case
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% --rcs
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% What others are easy and don't break up the code?
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The major changes I made were
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* Moved code for manipulating and displaying diffs to a separate
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module called diffs.m (and changed their calls in diff.m). The type
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'lcss,' needed both by the rest of lcss.m and by diffs.m, was moved
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to a new module lcsstype.m.
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* Made lcss.m independent of files, and allowed it to process any kind
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of list by adding polymorphism. (The file processing calls have
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been moved to diff.m.)
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* Added type synonyms 'pos' and 'segment' in diffs.m to clarify the
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types. Renamed 'single_diff' to 'edit'.
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* Added end-of-file match to the generated lcss, thereby allowing the
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to_diff predicate to be simplified considerably.
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* Numbered lists from 0 internally in the lcss-algorithm. This made
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to_diff simpler still, but also forced changes in the diff-printing
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part.
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* Removed the swapping in find_lcss, because it doesn't seem to help.
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* The array(string) representing a file in file.m was also renumbered
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to begin with 0.
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* Added and corrected comments.
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Have fun,
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<><
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Marnix
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--
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Marnix Klooster
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marnix@worldonline.nl
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