Rip out merge-order and make "git log <paths>..." work again.

Well, assuming breaking --merge-order is fine, here's a patch (on top of
the other ones) that makes

	git log <filename>

actually work, as far as I can tell.

I didn't add the logic for --before/--after flags, but that should be
pretty trivial, and is independent of this anyway.

Signed-off-by: Junio C Hamano <junkio@cox.net>

Documentation/git-rev-list.txt

@@ -16,7 +16,7 @@ SYNOPSIS
 	     [ \--no-merges ]
 	     [ \--remove-empty ]
 	     [ \--all ]
-	     [ [ \--merge-order [ \--show-breaks ] ] | [ \--topo-order ] ]
+	     [ \--topo-order ]
 	     [ \--parents ]
 	     [ \--objects [ \--unpacked ] ]
 	     [ \--pretty | \--header ]
@@ -94,57 +94,10 @@ OPTIONS
 	topological order (i.e. descendant commits are shown
 	before their parents).
 
---merge-order::
-	When specified the commit history is decomposed into a unique
-	sequence of minimal, non-linear epochs and maximal, linear epochs.
-	Non-linear epochs are then linearised by sorting them into merge
-	order, which is described below.
-+
-Maximal, linear epochs correspond to periods of sequential development.
-Minimal, non-linear epochs correspond to periods of divergent development
-followed by a converging merge. The theory of epochs is described in more
-detail at
-link:http://blackcubes.dyndns.org/epoch/[http://blackcubes.dyndns.org/epoch/].
-+
-The merge order for a non-linear epoch is defined as a linearisation for which
-the following invariants are true:
-+
-    1. if a commit P is reachable from commit N, commit P sorts after commit N
-       in the linearised list.
-    2. if Pi and Pj are any two parents of a merge M (with i < j), then any
-       commit N, such that N is reachable from Pj but not reachable from Pi,
-       sorts before all commits reachable from Pi.
-+
-Invariant 1 states that later commits appear before earlier commits they are
-derived from.
-+
-Invariant 2 states that commits unique to "later" parents in a merge, appear
-before all commits from "earlier" parents of a merge.
-
---show-breaks::
-	Each item of the list is output with a 2-character prefix consisting
-	of one of: (|), (^), (=) followed by a space.
-+
-Commits marked with (=) represent the boundaries of minimal, non-linear epochs
-and correspond either to the start of a period of divergent development or to
-the end of such a period.
-+
-Commits marked with (|) are direct parents of commits immediately preceding
-the marked commit in the list.
-+
-Commits marked with (^) are not parents of the immediately preceding commit.
-These "breaks" represent necessary discontinuities implied by trying to
-represent an arbitrary DAG in a linear form.
-+
-`--show-breaks` is only valid if `--merge-order` is also specified.
-
-
 Author
 ------
 Written by Linus Torvalds <torvalds@osdl.org>
 
-Original *--merge-order* logic by Jon Seymour <jon.seymour@gmail.com>
-
 Documentation
 --------------
 Documentation by David Greaves, Junio C Hamano and the git-list <git@vger.kernel.org>.

INSTALL

@@ -40,9 +40,7 @@ Issues of note:
 
 	  If you don't have openssl, you can use one of the SHA1 libraries
 	  that come with git (git includes the one from Mozilla, and has
-	  its own PowerPC-optimized one too - see the Makefile), and you
-	  can avoid the bignum support by excising git-rev-list support
-	  for "--merge-order" (by hand).
+	  its own PowerPC and ARM optimized ones too - see the Makefile).
 
 	- "libcurl" and "curl" executable.  git-http-fetch and
 	  git-fetch use them.  If you do not use http

Makefile

@@ -6,8 +6,8 @@ all:
 # on non-x86 architectures (e.g. PowerPC), while the OpenSSL version (default
 # choice) has very fast version optimized for i586.
 #
-# Define NO_OPENSSL environment variable if you do not have OpenSSL. You will
-# miss out git-rev-list --merge-order. This also implies MOZILLA_SHA1.
+# Define NO_OPENSSL environment variable if you do not have OpenSSL.
+# This also implies MOZILLA_SHA1.
 #
 # Define NO_CURL if you do not have curl installed.  git-http-pull and
 # git-http-push are not built, and you cannot use http:// and https://
@@ -191,7 +191,7 @@ LIB_FILE=libgit.a
 
 LIB_H = \
 	blob.h cache.h commit.h count-delta.h csum-file.h delta.h \
-	diff.h epoch.h object.h pack.h pkt-line.h quote.h refs.h \
+	diff.h object.h pack.h pkt-line.h quote.h refs.h \
 	run-command.h strbuf.h tag.h tree.h git-compat-util.h revision.h
 
 DIFF_OBJS = \
@@ -324,7 +324,6 @@ ifndef NO_CURL
 endif
 
 ifndef NO_OPENSSL
-	LIB_OBJS += epoch.o
 	OPENSSL_LIBSSL = -lssl
 	ifdef OPENSSLDIR
 		# Again this may be problematic -- gcc does not always want -R.