--- a/mercurial/error.py Thu Nov 19 09:19:44 2020 -0800
+++ b/mercurial/error.py Thu Nov 19 12:20:26 2020 -0800
@@ -13,6 +13,8 @@
from __future__ import absolute_import
+import difflib
+
# Do not import anything but pycompat here, please
from . import pycompat
@@ -270,6 +272,25 @@
__bytes__ = _tobytes
+def getsimilar(symbols, value):
+ sim = lambda x: difflib.SequenceMatcher(None, value, x).ratio()
+ # The cutoff for similarity here is pretty arbitrary. It should
+ # probably be investigated and tweaked.
+ return [s for s in symbols if sim(s) > 0.6]
+
+
+def similarity_hint(similar):
+ from .i18n import _
+
+ if len(similar) == 1:
+ return _(b"did you mean %s?") % similar[0]
+ elif similar:
+ ss = b", ".join(sorted(similar))
+ return _(b"did you mean one of %s?") % ss
+ else:
+ return None
+
+
class UnknownIdentifier(ParseError):
"""Exception raised when a {rev,file}set references an unknown identifier"""