Merge branch 'master' into next

* master:
  3% tighter packs for free
  Rewrite synopsis to clarify the two primary uses of git-checkout.
  Fix minor typo.
  Reference git-commit-tree for env vars.
  Clarify git-rebase example commands.
  Document the default source of template files.
  Call out the two different uses of git-branch and fix a typo.
  Add git-show reference

Documentation/git-branch.txt

@@ -7,16 +7,20 @@ git-branch - Create a new branch, or remove an old one
 
 SYNOPSIS
 --------
-'git-branch' [(-d | -D) <branchname>] | [[-f] <branchname> [<start-point>]]
+[verse]
+'git-branch' [[-f] <branchname> [<start-point>]]
+'git-branch' (-d | -D) <branchname>
 
 DESCRIPTION
 -----------
 If no argument is provided, show available branches and mark current
 branch with star. Otherwise, create a new branch of name <branchname>.
-
 If a starting point is also specified, that will be where the branch is
 created, otherwise it will be created at the current HEAD.
 
+With a `-d` or `-D` option, `<branchname>` will be deleted.
+
+
 OPTIONS
 -------
 -d::
@@ -39,7 +43,7 @@ OPTIONS
 Examples
 ~~~~~~~~
 
-Start development off of a know tag::
+Start development off of a known tag::
 +
 ------------
 $ git clone git://git.kernel.org/pub/scm/.../linux-2.6 my2.6

Documentation/git-checkout.txt

@@ -7,15 +7,18 @@ git-checkout - Checkout and switch to a branch
 
 SYNOPSIS
 --------
-'git-checkout' [-f] [-b <new_branch>] [-m] [<branch>] [<paths>...]
+[verse]
+'git-checkout' [-f] [-b <new_branch>] [-m] [<branch>]
+'git-checkout' [-m] [<branch>] <paths>...
 
 DESCRIPTION
 -----------
 
-When <paths> are not given, this command switches branches, by
+When <paths> are not given, this command switches branches by
 updating the index and working tree to reflect the specified
 branch, <branch>, and updating HEAD to be <branch> or, if
-specified, <new_branch>.
+specified, <new_branch>.  Using -b will cause <new_branch> to
+be created.
 
 When <paths> are given, this command does *not* switch
 branches.  It updates the named paths in the working tree from
@@ -29,17 +32,17 @@ given paths before updating the working tree.
 OPTIONS
 -------
 -f::
-	Force an re-read of everything.
+	Force a re-read of everything.
 
 -b::
 	Create a new branch and start it at <branch>.
 
 -m::
-	If you have local modifications to a file that is
-	different between the current branch and the branch you
-	are switching to, the command refuses to switch
-	branches, to preserve your modifications in context.
-	With this option, a three-way merge between the current
+	If you have local modifications to one or more files that
+	are different between the current branch and the branch to
+	which you are switching, the command refuses to switch
+	branches in order to preserve your modifications in context.
+	However, with this option, a three-way merge between the current
 	branch, your working tree contents, and the new branch
 	is done, and you will be on the new branch.
 +
@@ -82,7 +85,7 @@ $ git checkout -- hello.c
 ------------
 
 . After working in a wrong branch, switching to the correct
-branch you would want to is done with:
+branch would be done using:
 +
 ------------
 $ git checkout mytopic

Documentation/git-commit.txt

@@ -18,6 +18,10 @@ Updates the index file for given paths, or all modified files if
 VISUAL and EDITOR environment variables to edit the commit log
 message.
 
+Several environment variable are used during commits.  They are
+documented in gitlink:git-commit-tree[1].
+
+
 This command can run `commit-msg`, `pre-commit`, and
 `post-commit` hooks.  See link:hooks.html[hooks] for more
 information.

Documentation/git-init-db.txt

@@ -14,7 +14,8 @@ SYNOPSIS
 OPTIONS
 -------
 --template=<template_directory>::
-	Provide the directory in from which templates will be used.
+	Provide the directory from which templates will be used.
+	The default template directory is `/usr/share/git-core/templates`.
 
 --shared::
 	Specify that the git repository is to be shared amongst several users.
@@ -22,9 +23,17 @@ OPTIONS
 
 DESCRIPTION
 -----------
-This simply creates an empty git repository - basically a `.git` directory
-and `.git/object/??/`, `.git/refs/heads` and `.git/refs/tags` directories,
-and links `.git/HEAD` symbolically to `.git/refs/heads/master`.
+This command creates an empty git repository - basically a `.git` directory
+with subdirectories for `objects`, `refs/heads`, `refs/tags`, and
+templated files.
+An initial `HEAD` file that references the HEAD of the master branch
+is also created.
+
+If `--template=<template_directory>` is specified, `<template_directory>`
+is used as the source of the template files rather than the default.
+The template files include some directory structure, some suggested
+"exclude patterns", and copies of non-executing "hook" files.  The
+suggested patterns and hook files are all modifiable and extensible.
 
 If the `$GIT_DIR` environment variable is set then it specifies a path
 to use instead of `./.git` for the base of the repository.
@@ -38,7 +47,6 @@ repository. When specifying `--shared` the config variable "core.sharedRepositor
 is set to 'true' so that directories under `$GIT_DIR` are made group writable
 (and g+sx, since the git group may be not the primary group of all users).
 
-
 Running `git-init-db` in an existing repository is safe. It will not overwrite
 things that are already there. The primary reason for rerunning `git-init-db`
 is to pick up newly added templates.

Documentation/git-rebase.txt

@@ -25,7 +25,7 @@ Assume the following history exists and the current branch is "topic":
          /
     D---E---F---G master
 
-From this point, the result of the following commands:
+From this point, the result of either of the following commands:
 
     git-rebase master
     git-rebase master topic
@@ -36,7 +36,7 @@ would be:
                  /
     D---E---F---G master
 
-While, starting from the same point, the result of the following
+While, starting from the same point, the result of either of the following
 commands:
 
     git-rebase --onto master~1 master
@@ -58,7 +58,7 @@ OPTIONS
 <upstream>::
 	Upstream branch to compare against.
 
-<head>::
+<branch>::
 	Working branch; defaults to HEAD.
 
 Author

Documentation/git-show-branch.txt

@@ -141,7 +141,7 @@ it, having the following in the configuration file may help:
 
 ------------
 
-With this,`git show-branch` without extra parameters would show
+With this, `git show-branch` without extra parameters would show
 only the primary branches.  In addition, if you happen to be on
 your topic branch, it is shown as well.
 

Documentation/git.txt

@@ -329,6 +329,9 @@ gitlink:git-revert[1]::
 gitlink:git-shortlog[1]::
 	Summarizes 'git log' output.
 
+gitlink:git-show[1]::
+	Show one commit log and its diff.
+
 gitlink:git-show-branch[1]::
 	Show branches and their commits.
 

diff-delta.c

@@ -136,7 +136,8 @@ void *diff_delta(void *from_buf, unsigned long from_size,
 		 unsigned long *delta_size,
 		 unsigned long max_size)
 {
-	unsigned int i, outpos, outsize, inscnt, hash_shift;
+	unsigned int i, outpos, outsize, hash_shift;
+	int inscnt;
 	const unsigned char *ref_data, *ref_top, *data, *top;
 	unsigned char *out;
 	struct index *entry, **hash;
@@ -222,6 +223,20 @@ void *diff_delta(void *from_buf, unsigned long from_size,
 			unsigned char *op;
 
 			if (inscnt) {
+				while (moff && ref_data[moff-1] == data[-1]) {
+					if (msize == 0x10000)
+						break;
+					/* we can match one byte back */
+					msize++;
+					moff--;
+					data--;
+					outpos--;
+					if (--inscnt)
+						continue;
+					outpos--;  /* remove count slot */
+					inscnt--;  /* make it -1 */
+					break;
+				}
 				out[outpos - inscnt - 1] = inscnt;
 				inscnt = 0;
 			}