mdiff: add a config option to use xdiff algorithm
The `experimental.xdiff` will affect the default diffopts and make mdiff use
the xdiff algorithm for better diff quality.
Differential Revision: https://phab.mercurial-scm.org/D2603
--- a/mercurial/configitems.py Sat Mar 03 12:39:14 2018 -0800
+++ b/mercurial/configitems.py Sat Mar 03 12:39:14 2018 -0800
@@ -577,6 +577,9 @@
coreconfigitem('experimental', 'sshpeer.advertise-v2',
default=False,
)
+coreconfigitem('experimental', 'xdiff',
+ default=False,
+)
coreconfigitem('extensions', '.*',
default=None,
generic=True,
--- a/mercurial/mdiff.py Sat Mar 03 12:39:14 2018 -0800
+++ b/mercurial/mdiff.py Sat Mar 03 12:39:14 2018 -0800
@@ -63,6 +63,7 @@
'upgrade': False,
'showsimilarity': False,
'worddiff': False,
+ 'xdiff': False,
}
def __init__(self, **opts):
@@ -188,6 +189,13 @@
raise error.Abort(_('line range exceeds file size'))
return filteredblocks, (lba, uba)
+def chooseblocksfunc(opts=None):
+ if (opts is None or not opts.xdiff
+ or not util.safehasattr(bdiff, 'xdiffblocks')):
+ return bdiff.blocks
+ else:
+ return bdiff.xdiffblocks
+
def allblocks(text1, text2, opts=None, lines1=None, lines2=None):
"""Return (block, type) tuples, where block is an mdiff.blocks
line entry. type is '=' for blocks matching exactly one another
@@ -201,7 +209,7 @@
if opts.ignorews or opts.ignorewsamount or opts.ignorewseol:
text1 = wsclean(opts, text1, False)
text2 = wsclean(opts, text2, False)
- diff = bdiff.blocks(text1, text2)
+ diff = chooseblocksfunc(opts)(text1, text2)
for i, s1 in enumerate(diff):
# The first match is special.
# we've either found a match starting at line 0 or a match later
--- a/mercurial/patch.py Sat Mar 03 12:39:14 2018 -0800
+++ b/mercurial/patch.py Sat Mar 03 12:39:14 2018 -0800
@@ -2256,6 +2256,7 @@
'context': get('unified', getter=ui.config),
}
buildopts['worddiff'] = ui.configbool('experimental', 'worddiff')
+ buildopts['xdiff'] = ui.configbool('experimental', 'xdiff')
if git:
buildopts['git'] = get('git')