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-From: Junio C Hamano <gitster@pobox.com>
-Subject: Separating topic branches
-Abstract: In this article, JC describes how to separate topic branches.
-Content-type: text/asciidoc
-
-How to separate topic branches
-==============================
-
-This text was originally a footnote to a discussion about the
-behaviour of the git diff commands.
-
-Often I find myself doing that [running diff against something other
-than HEAD] while rewriting messy development history.  For example, I
-start doing some work without knowing exactly where it leads, and end
-up with a history like this:
-
-            "master"
-        o---o
-             \                    "topic"
-              o---o---o---o---o---o
-
-At this point, "topic" contains something I know I want, but it
-contains two concepts that turned out to be completely independent.
-And often, one topic component is larger than the other.  It may
-contain more than two topics.
-
-In order to rewrite this mess to be more manageable, I would first do
-"diff master..topic", to extract the changes into a single patch, start
-picking pieces from it to get logically self-contained units, and
-start building on top of "master":
-
-        $ git diff master..topic >P.diff
-        $ git checkout -b topicA master
-        ... pick and apply pieces from P.diff to build
-        ... commits on topicA branch.
-
-              o---o---o
-             /        "topicA"
-        o---o"master"
-             \                    "topic"
-              o---o---o---o---o---o
-
-Before doing each commit on "topicA" HEAD, I run "diff HEAD"
-before update-index the affected paths, or "diff --cached HEAD"
-after.  Also I would run "diff --cached master" to make sure
-that the changes are only the ones related to "topicA".  Usually
-I do this for smaller topics first.
-
-After that, I'd do the remainder of the original "topic", but
-for that, I do not start from the patchfile I extracted by
-comparing "master" and "topic" I used initially.  Still on
-"topicA", I extract "diff topic", and use it to rebuild the
-other topic:
-
-        $ git diff -R topic >P.diff ;# --cached also would work fine
-        $ git checkout -b topicB master
-        ... pick and apply pieces from P.diff to build
-        ... commits on topicB branch.
-
-                                "topicB"
-               o---o---o---o---o
-              /
-             /o---o---o
-            |/        "topicA"
-        o---o"master"
-             \                    "topic"
-              o---o---o---o---o---o
-
-After I am done, I'd try a pretend-merge between "topicA" and
-"topicB" in order to make sure I have not missed anything:
-
-        $ git pull . topicA ;# merge it into current "topicB"
-        $ git diff topic
-                                "topicB"
-               o---o---o---o---o---* (pretend merge)
-              /                   /
-             /o---o---o----------'
-            |/        "topicA"
-        o---o"master"
-             \                    "topic"
-              o---o---o---o---o---o
-
-The last diff better not to show anything other than cleanups
-for crufts.  Then I can finally clean things up:
-
-        $ git branch -D topic
-        $ git reset --hard HEAD^ ;# nuke pretend merge
-
-                                "topicB"
-               o---o---o---o---o
-              /
-             /o---o---o
-            |/        "topicA"
-        o---o"master"