Mercurial > hg
view contrib/simplemerge @ 15462:2b1ec74c961f stable
mdiff/patch: fix bad hunk handling for unified diffs with zero context
Prior to this patch "hg diff -U0", i.e., zero lines of context, would
output hunk headers with a start line one greater than what GNU patch
and git output. Guido van Rossum documents the unified diff format[1]
as having a start line value "one lower than one would expect" for
zero length hunks.
Comparing the behaviour of the three systems prior to this patch in
transforming
c1
c3
to
c1
c2
c3
- GNU "diff -U0" reports the hunk as "@@ -1,0 +2 @@"
- "git diff -U0" reports the hunk as "@@ -1,0 +2 @@"
- "hg diff -U0" reports the hunk as "@@ -2,0 +2,1 @@"
After this patch, "hg diff -U0" reports "@@ -1,0 +2,1 @@".
Since "hg export --config diff.unified=0" outputs zero-context unified
diffs, "hg import" has also been updated to account for start lines
one less than expected for zero length hunk ranges.
[1]: http://www.artima.com/weblogs/viewpost.jsp?thread=164293
author | Nicolas Venegas <nvenegas@atlassian.com> |
---|---|
date | Wed, 09 Nov 2011 16:55:59 -0800 |
parents | 659f34b833b9 |
children | cba222f01056 |
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#!/usr/bin/env python from mercurial import demandimport demandimport.enable() import os, sys from mercurial.i18n import _ from mercurial import simplemerge, fancyopts, util, ui options = [('L', 'label', [], _('labels to use on conflict markers')), ('a', 'text', None, _('treat all files as text')), ('p', 'print', None, _('print results instead of overwriting LOCAL')), ('', 'no-minimal', None, _('do not try to minimize conflict regions')), ('h', 'help', None, _('display help and exit')), ('q', 'quiet', None, _('suppress output'))] usage = _('''simplemerge [OPTS] LOCAL BASE OTHER Simple three-way file merge utility with a minimal feature set. Apply to LOCAL the changes necessary to go from BASE to OTHER. By default, LOCAL is overwritten with the results of this operation. ''') class ParseError(Exception): """Exception raised on errors in parsing the command line.""" def showhelp(): sys.stdout.write(usage) sys.stdout.write('\noptions:\n') out_opts = [] for shortopt, longopt, default, desc in options: out_opts.append(('%2s%s' % (shortopt and '-%s' % shortopt, longopt and ' --%s' % longopt), '%s' % desc)) opts_len = max([len(opt[0]) for opt in out_opts]) for first, second in out_opts: sys.stdout.write(' %-*s %s\n' % (opts_len, first, second)) try: for fp in (sys.stdin, sys.stdout, sys.stderr): util.setbinary(fp) opts = {} try: args = fancyopts.fancyopts(sys.argv[1:], options, opts) except fancyopts.getopt.GetoptError, e: raise ParseError(e) if opts['help']: showhelp() sys.exit(0) if len(args) != 3: raise ParseError(_('wrong number of arguments')) sys.exit(simplemerge.simplemerge(ui.ui(), *args, **opts)) except ParseError, e: sys.stdout.write("%s: %s\n" % (sys.argv[0], e)) showhelp() sys.exit(1) except util.Abort, e: sys.stderr.write("abort: %s\n" % e) sys.exit(255) except KeyboardInterrupt: sys.exit(255)