doc/git-log: describe new --diff-merges options

Describe all the new --diff-merges options in the git-log.txt and
adopt description of originals accordingly.

Signed-off-by: Sergey Organov <sorganov@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/git-log.txt b/Documentation/git-log.txt
index 2b8ac5ff882ae84d52d08458c2439f314d2a0370..ff83dff14dd671d8bab78561241be4e396de2b25 100644 (file)
--- a/Documentation/git-log.txt
+++ b/Documentation/git-log.txt
@@ -120,45 +120,62 @@ DIFF FORMATTING
 By default, `git log` does not generate any diff output. The options
 below can be used to show the changes made by each commit.
 
-Note that unless one of `-c`, `--cc`, or `-m` is given, merge commits
-will never show a diff, even if a diff format like `--patch` is
-selected, nor will they match search options like `-S`. The exception is
-when `--first-parent` is in use, in which merges are treated like normal
-single-parent commits (this can be overridden by providing a
-combined-diff option or with `--no-diff-merges`).
-
--c::
-       With this option, diff output for a merge commit
-       shows the differences from each of the parents to the merge result
-       simultaneously instead of showing pairwise diff between a parent
-       and the result one at a time. Furthermore, it lists only files
-       which were modified from all parents.
-
---cc::
-       This flag implies the `-c` option and further compresses the
-       patch output by omitting uninteresting hunks whose contents in
-       the parents have only two variants and the merge result picks
-       one of them without modification.
+Note that unless one of `--diff-merges` variants (including short
+`-m`, `-c`, and `--cc` options) is explicitly given, merge commits
+will not show a diff, even if a diff format like `--patch` is
+selected, nor will they match search options like `-S`. The exception
+is when `--first-parent` is in use, in which case `first-parent` is
+the default format.
+
+--diff-merges=(off|none|first-parent|1|separate|m|combined|c|dense-combined|cc)::
+--no-diff-merges::
+       Specify diff format to be used for merge commits. Default is
+       `off` unless `--first-parent` is in use, in which case
+       `first-parent` is the default.
++
+--diff-merges=(off|none):::
+--no-diff-merges:::
+       Disable output of diffs for merge commits. Useful to override
+       implied value.
++
+--diff-merges=first-parent:::
+--diff-merges=1:::
+       This option makes merge commits show the full diff with
+       respect to the first parent only.
++
+--diff-merges=separate:::
+--diff-merges=m:::
+-m:::
+       This makes merge commits show the full diff with respect to
+       each of the parents. Separate log entry and diff is generated
+       for each parent. `-m` doesn't produce any output without `-p`.
++
+--diff-merges=combined:::
+--diff-merges=c:::
+-c:::
+       With this option, diff output for a merge commit shows the
+       differences from each of the parents to the merge result
+       simultaneously instead of showing pairwise diff between a
+       parent and the result one at a time. Furthermore, it lists
+       only files which were modified from all parents. `-c` implies
+       `-p`.
++
+--diff-merges=dense-combined:::
+--diff-merges=cc:::
+--cc:::
+       With this option the output produced by
+       `--diff-merges=combined` is further compressed by omitting
+       uninteresting hunks whose contents in the parents have only
+       two variants and the merge result picks one of them without
+       modification.  `--cc` implies `-p`.
 
 --combined-all-paths::
        This flag causes combined diffs (used for merge commits) to
        list the name of the file from all parents.  It thus only has
-       effect when -c or --cc are specified, and is likely only
-       useful if filename changes are detected (i.e. when either
-       rename or copy detection have been requested).
-
--m::
-       This flag makes the merge commits show the full diff like
-       regular commits; for each merge parent, a separate log entry
-       and diff is generated. An exception is that only diff against
-       the first parent is shown when `--first-parent` option is given;
-       in that case, the output represents the changes the merge
-       brought _into_ the then-current branch.
-
---diff-merges=off::
---no-diff-merges::
-       Disable output of diffs for merge commits (default). Useful to
-       override `-m`, `-c`, or `--cc`.
+       effect when `--diff-merges=[dense-]combined` is in use, and
+       is likely only useful if filename changes are detected (i.e.
+       when either rename or copy detection have been requested).
+
 
 :git-log: 1
 include::diff-options.txt[]