the diff-patch output format. Non default number of
digits can be specified with `--abbrev=<n>`.
--B::
- Break complete rewrite changes into pairs of delete and create.
-
--M::
+-B[<n>][/<m>]::
+ Break complete rewrite changes into pairs of delete and
+ create. This serves two purposes:
++
+It affects the way a change that amounts to a total rewrite of a file
+not as a series of deletion and insertion mixed together with a very
+few lines that happen to match textually as the context, but as a
+single deletion of everything old followed by a single insertion of
+everything new, and the number `m` controls this aspect of the -B
+option (defaults to 60%). `-B/70%` specifies that less than 30% of the
+original should remain in the result for git to consider it a total
+rewrite (i.e. otherwise the resulting patch will be a series of
+deletion and insertion mixed together with context lines).
++
+When used with -M, a totally-rewritten file is also considered as the
+source of a rename (usually -M only considers a file that disappeared
+as the source of a rename), and the number `n` controls this aspect of
+the -B option (defaults to 50%). `-B20%` specifies that a change with
+addition and deletion compared to 20% or more of the file's size are
+eligible for being picked up as a possible source of a rename to
+another file.
+
+-M[<n>]::
+ifndef::git-log[]
Detect renames.
+endif::git-log[]
+ifdef::git-log[]
+ If generating diffs, detect and report renames for each commit.
+ For following files across renames while traversing history, see
+ `--follow`.
+endif::git-log[]
+ If `n` is specified, it is a is a threshold on the similarity
+ index (i.e. amount of addition/deletions compared to the
+ file's size). For example, `-M90%` means git should consider a
+ delete/add pair to be a rename if more than 90% of the file
+ hasn't changed.
--C::
+-C[<n>]::
Detect copies as well as renames. See also `--find-copies-harder`.
+ If `n` is specified, it has the same meaning as for `-M<n>`.
ifndef::git-format-patch[]
--diff-filter=[ACDMRTUXB*]::
--no-ext-diff::
Disallow external diff drivers.
---ignore-submodules::
- Ignore changes to submodules in the diff generation.
+--ignore-submodules[=<when>]::
+ Ignore changes to submodules in the diff generation. <when> can be
+ either "none", "untracked", "dirty" or "all", which is the default
+ Using "none" will consider the submodule modified when it either contains
+ untracked or modified files or its HEAD differs from the commit recorded
+ in the superproject and can be used to override any settings of the
+ 'ignore' option in linkgit:git-config[1] or linkgit:gitmodules[5]. When
+ "untracked" is used submodules are not considered dirty when they only
+ contain untracked content (but they are still scanned for modified
+ content). Using "dirty" ignores all changes to the work tree of submodules,
+ only changes to the commits stored in the superproject are shown (this was
+ the behavior until 1.7.0). Using "all" hides all changes to submodules.
--src-prefix=<prefix>::
Show the given source prefix instead of "a/".