notes: implement helpers needed for note copying during rewrite

diff --git a/Documentation/git-notes.txt b/Documentation/git-notes.txt
index 7abd0fbd2373b737fbdbdac3f4cc1616a6c7fbbf..b12d1cf5397081f5bd07beeec5e705e9a221255f 100644 (file)
--- a/Documentation/git-notes.txt
+++ b/Documentation/git-notes.txt
@@ -10,7 +10,7 @@ SYNOPSIS
 [verse]
 'git notes' [list [<object>]]
 'git notes' add [-f] [-F <file> | -m <msg> | (-c | -C) <object>] [<object>]
-'git notes' copy [-f] <from-object> <to-object>
+'git notes' copy [-f] ( --stdin | <from-object> <to-object> )
 'git notes' append [-F <file> | -m <msg> | (-c | -C) <object>] [<object>]
 'git notes' edit [<object>]
 'git notes' show [<object>]
@@ -35,6 +35,10 @@ This command always manipulates the notes specified in "core.notesRef"
 To change which notes are shown by 'git-log', see the
 "notes.displayRef" configuration.
 
+See the description of "notes.rewrite.<command>" in
+linkgit:git-config[1] for a way of carrying your notes across commands
+that rewrite commits.
+
 
 SUBCOMMANDS
 -----------
@@ -56,6 +60,16 @@ copy::
        objects has none. (use -f to overwrite existing notes to the
        second object). This subcommand is equivalent to:
        `git notes add [-f] -C $(git notes list <from-object>) <to-object>`
++
+In `\--stdin` mode, take lines in the format
++
+----------
+<from-object> SP <to-object> [ SP <rest> ] LF
+----------
++
+on standard input, and copy the notes from each <from-object> to its
+corresponding <to-object>.  (The optional `<rest>` is ignored so that
+the command can read the input given to the `post-rewrite` hook.)
 
 append::
        Append to the notes of an existing object (defaults to HEAD).