[PATCH v4 3/3] doc/cat-file: allow --use-mailmap for --batch options

[Siddharth Asthana <siddharthasthana31@gmail.com>]

The command git cat-file can now use the mailmap mechanism to replace
idents with their canonical versions for commit and tag objects. There
are several options like `-s`, `--batch`, `--batch-check` and
`--batch-command` that can be combined with `--use-mailmap`. But the
documentation for `-s`, `--batch`, `--batch-check` and `--batch-command`
doesn't say so. This patch fixes that documentation.

Mentored-by: Christian Couder <christian.couder@gmail.com>
Mentored-by: John Cai <johncai86@gmail.com>
Helped-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Siddharth Asthana <siddharthasthana31@gmail.com>
---
 Documentation/git-cat-file.txt | 53 +++++++++++++++++++++++++---------
 1 file changed, 39 insertions(+), 14 deletions(-)

diff --git a/Documentation/git-cat-file.txt b/Documentation/git-cat-file.txt
index ec30b5c574..81235c60a3 100644
--- a/Documentation/git-cat-file.txt
+++ b/Documentation/git-cat-file.txt
@@ -45,7 +45,9 @@ OPTIONS
 
 -s::
 	Instead of the content, show the object size identified by
-	`<object>`.
+	`<object>`. If used with `--use-mailmap` option, will show
+	the size of updated object after replacing idents using the
+	mailmap mechanism.
 
 -e::
 	Exit with zero status if `<object>` exists and is a valid
@@ -89,26 +91,49 @@ OPTIONS
 --batch::
 --batch=<format>::
 	Print object information and contents for each object provided
-	on stdin.  May not be combined with any other options or arguments
-	except `--textconv` or `--filters`, in which case the input lines
-	also need to specify the path, separated by whitespace.  See the
-	section `BATCH OUTPUT` below for details.
+	on stdin. May not be combined with any other options or arguments
+	except --textconv, --filters, or --use-mailmap.
+	+
+	* When used with `--textconv` or `--filters`, the input lines
+	  must specify the path, separated by whitespace. See the section
+	  `BATCH OUTPUT` below for details.
+	+
+	* When used with `--use-mailmap`, for commit and tag objects, the
+	  contents part of the output shows the identities replaced using the
+	  mailmap mechanism, while the information part of the output shows
+	  the size of the object as if it actually recorded the replacement
+	  identities.
 
 --batch-check::
 --batch-check=<format>::
-	Print object information for each object provided on stdin.  May
-	not be combined with any other options or arguments except
-	`--textconv` or `--filters`, in which case the input lines also
-	need to specify the path, separated by whitespace.  See the
-	section `BATCH OUTPUT` below for details.
+	Print object information for each object provided on stdin. May not be
+	combined with any other options or arguments except --textconv, --filters
+	or --use-mailmap.
+	+
+	* When used with `--textconv` or `--filters`, the input lines must
+	 specify the path, separated by whitespace. See the section
+	 `BATCH OUTPUT` below for details.
+	+
+	* When used with `--use-mailmap`, for commit and tag objects, the
+	  printed object information shows the size of the object as if the
+	  identities recorded in it were replaced by the mailmap mechanism.
 
 --batch-command::
 --batch-command=<format>::
 	Enter a command mode that reads commands and arguments from stdin. May
-	only be combined with `--buffer`, `--textconv` or `--filters`. In the
-	case of `--textconv` or `--filters`, the input lines also need to specify
-	the path, separated by whitespace. See the section `BATCH OUTPUT` below
-	for details.
+	only be combined with `--buffer`, `--textconv`, `--use-mailmap` or
+	`--filters`.
+	+
+	* When used with `--textconv` or `--filters`, the input lines must
+	  specify the path, separated by whitespace. See the section
+	  `BATCH OUTPUT` below for details.
+	+
+	* When used with `--use-mailmap`, for commit and tag objects, the
+	  `contents` command shows the identities replaced using the
+	  mailmap mechanism, while the `info` command shows the size
+	  of the object as if it actually recorded the replacement
+	  identities.
+
 +
 `--batch-command` recognizes the following commands:
 +
-- 
2.38.1.420.g319605f8f0