Merge branch 'js/rebase'

* js/rebase:
  Teach rebase -i about --preserve-merges
  rebase -i: provide reasonable reflog for the rebased branch
  rebase -i: several cleanups
  ignore git-rebase--interactive
  Teach rebase an interactive mode
  Move the pick_author code to git-sh-setup

Author: gitster

.gitignore

@@ -96,6 +96,7 @@ git-push
 git-quiltimport
 git-read-tree
 git-rebase
+git-rebase--interactive
 git-receive-pack
 git-reflog
 git-relink

Documentation/git-rebase.txt

@@ -8,7 +8,8 @@ git-rebase - Forward-port local commits to the updated upstream head
 SYNOPSIS
 --------
 [verse]
-'git-rebase' [-v] [--merge] [-C<n>] [--onto <newbase>] <upstream> [<branch>]
+'git-rebase' [-i | --interactive] [-v | --verbose] [--merge] [-C<n>]
+	[-p | --preserve-merges] [--onto <newbase>] <upstream> [<branch>]
 'git-rebase' --continue | --skip | --abort
 
 DESCRIPTION
@@ -208,6 +209,14 @@ OPTIONS
 	context exist they all must match.  By default no context is
 	ever ignored.
 
+-i, \--interactive::
+	Make a list of the commits which are about to be rebased.  Let the
+	user edit that list before rebasing.
+
+-p, \--preserve-merges::
+	Instead of ignoring merges, try to recreate them.  This option
+	only works in interactive mode.
+
 include::merge-strategies.txt[]
 
 NOTES
@@ -226,9 +235,100 @@ pre-rebase hook script for an example.
 You must be in the top directory of your project to start (or continue)
 a rebase.  Upon completion, <branch> will be the current branch.
 
-Author
+INTERACTIVE MODE
+----------------
+
+Rebasing interactively means that you have a chance to edit the commits
+which are rebased.  You can reorder the commits, and you can
+remove them (weeding out bad or otherwise unwanted patches).
+
+The interactive mode is meant for this type of workflow:
+
+1. have a wonderful idea
+2. hack on the code
+3. prepare a series for submission
+4. submit
+
+where point 2. consists of several instances of
+
+a. regular use
+ 1. finish something worthy of a commit
+ 2. commit
+b. independent fixup
+ 1. realize that something does not work
+ 2. fix that
+ 3. commit it
+
+Sometimes the thing fixed in b.2. cannot be amended to the not-quite
+perfect commit it fixes, because that commit is buried deeply in a
+patch series.  That is exactly what interactive rebase is for: use it
+after plenty of "a"s and "b"s, by rearranging and editing
+commits, and squashing multiple commits into one.
+
+Start it with the last commit you want to retain as-is:
+
+	git rebase -i <after-this-commit>
+
+An editor will be fired up with all the commits in your current branch
+(ignoring merge commits), which come after the given commit.  You can
+reorder the commits in this list to your heart's content, and you can
+remove them.  The list looks more or less like this:
+
+-------------------------------------------
+pick deadbee The oneline of this commit
+pick fa1afe1 The oneline of the next commit
+...
+-------------------------------------------
+
+The oneline descriptions are purely for your pleasure; `git-rebase` will
+not look at them but at the commit names ("deadbee" and "fa1afe1" in this
+example), so do not delete or edit the names.
+
+By replacing the command "pick" with the command "edit", you can tell
+`git-rebase` to stop after applying that commit, so that you can edit
+the files and/or the commit message, amend the commit, and continue
+rebasing.
+
+If you want to fold two or more commits into one, replace the command
+"pick" with "squash" for the second and subsequent commit.  If the
+commits had different authors, it will attribute the squashed commit to
+the author of the last commit.
+
+In both cases, or when a "pick" does not succeed (because of merge
+errors), the loop will stop to let you fix things, and you can continue
+the loop with `git rebase --continue`.
+
+For example, if you want to reorder the last 5 commits, such that what
+was HEAD~4 becomes the new HEAD. To achieve that, you would call
+`git-rebase` like this:
+
+----------------------
+$ git rebase -i HEAD~5
+----------------------
+
+And move the first patch to the end of the list.
+
+You might want to preserve merges, if you have a history like this:
+
+------------------
+           X
+            \
+         A---M---B
+        /
+---o---O---P---Q
+------------------
+
+Suppose you want to rebase the side branch starting at "A" to "Q". Make
+sure that the current HEAD is "B", and call
+
+-----------------------------
+$ git rebase -i -p --onto Q O
+-----------------------------
+
+Authors
 ------
-Written by Junio C Hamano <[email protected]>
+Written by Junio C Hamano <[email protected]> and
+Johannes E. Schindelin <[email protected]>
 
 Documentation
 --------------

Makefile

@@ -204,7 +204,7 @@ SCRIPT_SH = \
 	git-fetch.sh \
 	git-ls-remote.sh \
 	git-merge-one-file.sh git-mergetool.sh git-parse-remote.sh \
-	git-pull.sh git-rebase.sh \
+	git-pull.sh git-rebase.sh git-rebase--interactive.sh \
 	git-repack.sh git-request-pull.sh git-reset.sh \
 	git-sh-setup.sh \
 	git-tag.sh git-verify-tag.sh \

git-commit.sh

@@ -483,34 +483,8 @@ fi >>"$GIT_DIR"/COMMIT_EDITMSG
 # Author
 if test '' != "$use_commit"
 then
-	pick_author_script='
-	/^author /{
-		s/'\''/'\''\\'\'\''/g
-		h
-		s/^author \([^<]*\) <[^>]*> .*$/\1/
-		s/'\''/'\''\'\'\''/g
-		s/.*/GIT_AUTHOR_NAME='\''&'\''/p
-
-		g
-		s/^author [^<]* <\([^>]*\)> .*$/\1/
-		s/'\''/'\''\'\'\''/g
-		s/.*/GIT_AUTHOR_EMAIL='\''&'\''/p
-
-		g
-		s/^author [^<]* <[^>]*> \(.*\)$/\1/
-		s/'\''/'\''\'\'\''/g
-		s/.*/GIT_AUTHOR_DATE='\''&'\''/p
-
-		q
-	}
-	'
-	encoding=$(git config i18n.commitencoding || echo UTF-8)
-	set_author_env=`git show -s --pretty=raw --encoding="$encoding" "$use_commit" |
-	LANG=C LC_ALL=C sed -ne "$pick_author_script"`
-	eval "$set_author_env"
-	export GIT_AUTHOR_NAME
-	export GIT_AUTHOR_EMAIL
-	export GIT_AUTHOR_DATE
+	eval "$(get_author_ident_from_commit "$use_commit")"
+	export GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL GIT_AUTHOR_DATE
 fi
 if test '' != "$force_author"
 then