doc/git-show: include --diff-merges description

Move description of --diff-merges option from git-log.txt to
diff-options.txt so that it is included in the git-show help.

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

Documentation/diff-options.txt

@@ -33,6 +33,57 @@ endif::git-diff[]
 	show the patch by default, or to cancel the effect of `--patch`.
 endif::git-format-patch[]
 
+ifdef::git-log[]
+--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
+	{diff-merges-default} 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 `--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).
+endif::git-log[]
+
 -U<n>::
 --unified=<n>::
 	Generate diffs with <n> lines of context instead of

Documentation/git-log.txt

@@ -127,57 +127,8 @@ 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 `--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
+:diff-merges-default: `off`
 include::diff-options.txt[]
 
 include::diff-generate-patch.txt[]

Documentation/git-show.txt

@@ -45,10 +45,13 @@ include::pretty-options.txt[]
 include::pretty-formats.txt[]
 
 
-COMMON DIFF OPTIONS
--------------------
+DIFF FORMATTING
+---------------
+The options below can be used to change the way `git show` generates
+diff output.
 
 :git-log: 1
+:diff-merges-default: `dense-combined`
 include::diff-options.txt[]
 
 include::diff-generate-patch.txt[]