Add packed-ref handling

This reverts commit 21b6dd7aee.

Closes https://github.com/tpope/vim-fugitive/issues/726

.gitignore

@@ -0,0 +1 @@
+/doc/tags

CONTRIBUTING.markdown

@@ -0,0 +1,18 @@
+Before reporting a bug, you should try stripping down your Vim configuration
+and removing other plugins.  The sad truth about VimScript is that it is
+fraught with incompatibilities waiting to happen.  I'm happy to work around
+them where I can, but it's up to you to isolate the conflict.
+
+Fugitive is particularly prone to regressions due to Git version issues,
+platform issues, and interactions with other plugins.  I end up bisecting a
+lot more than other projects, and thus I'm especially meticulous here about
+maintaining a clean, readable, history.  Squash and force push any requested
+changes to a pull request.  And if your [commit message
+sucks](http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html),
+I'm not going to accept it.  Period.
+
+Beyond that, don't be shy about asking before patching.  What takes you hours
+might take me minutes simply because I have both domain knowledge and a
+perverse knowledge of VimScript so vast that many would consider it a symptom
+of mental illness.  On the flip side, some ideas I'll reject no matter how
+good the implementation is.  "Send a patch" is an edge case answer in my book.

README.markdown

@@ -1,5 +1,4 @@
-fugitive.vim
-============
+# fugitive.vim
 
 I'm not going to lie to you; fugitive.vim may very well be the best
 Git wrapper of all time.  Check out these features:
@@ -11,13 +10,14 @@ version of the file side by side with the working tree version and use
 Vim's diff handling capabilities to stage a subset of the file's
 changes.
 
-Bring up the output of `git status` with `:Gstatus`.  Use `-` to
-`add`/`reset` a file's changes, or `p` to `add`/`reset` `--patch` that
-mofo.  And guess what `:Gcommit` does!
+Bring up the output of `git status` with `:Gstatus`.  Press `-` to
+`add`/`reset` a file's changes, or `p` to `add`/`reset` `--patch`.  And guess
+what `:Gcommit` does!
 
 `:Gblame` brings up an interactive vertical split with `git blame`
-output.  Press enter on a line to reblame the file as it stood in that
-commit, or `o` to open that commit in a split.
+output.  Press enter on a line to edit the commit where the line
+changed, or `o` to open it in a split.  When you're done, use `:Gedit`
+in the historic buffer to go back to the work tree version.
 
 `:Gmove` does a `git mv` on a file and simultaneously renames the
 buffer.  `:Gremove` does a `git rm` on a file and simultaneously deletes
@@ -35,11 +35,84 @@ and you never get any warnings about the file changing outside Vim.
 making it like `git add` when called from a work tree file and like
 `git checkout` when called from the index or a blob in history.
 
+Use `:Gbrowse` to open the current file on GitHub, with optional line
+range (try it in visual mode!).  If your current repository isn't on
+GitHub, `git instaweb` will be spun up instead.
+
 Add `%{fugitive#statusline()}` to `'statusline'` to get an indicator
 with the current branch in (surprise!) your statusline.
 
-Oh, and of course there's `:Git` for running any arbitrary command.
+Last but not least, there's `:Git` for running any arbitrary command,
+and `Git!` to open the output of a command in a temp file.
+
+## Screencasts
+
+* [A complement to command line git](http://vimcasts.org/e/31)
+* [Working with the git index](http://vimcasts.org/e/32)
+* [Resolving merge conflicts with vimdiff](http://vimcasts.org/e/33)
+* [Browsing the git object database](http://vimcasts.org/e/34)
+* [Exploring the history of a git repository](http://vimcasts.org/e/35)
+
+## Installation
+
+If you don't have a preferred installation method, one option is to install
+[pathogen.vim](https://github.com/tpope/vim-pathogen), and then copy
+and paste:
+
+    cd ~/.vim/bundle
+    git clone git://github.com/tpope/vim-fugitive.git
+    vim -u NONE -c "helptags vim-fugitive/doc" -c q
+
+If your Vim version is below 7.2, I recommend also installing
+[vim-git](https://github.com/tpope/vim-git) for syntax highlighting and
+other Git niceties.
+
+## FAQ
+
+> I installed the plugin and started Vim.  Why don't any of the commands
+> exist?
+
+Fugitive cares about the current file, not the current working
+directory.  Edit a file from the repository.
+
+> I opened a new tab.  Why don't any of the commands exist?
+
+Fugitive cares about the current file, not the current working
+directory.  Edit a file from the repository.
+
+> Why is `:Gbrowse` not using the right browser?
+
+`:Gbrowse` delegates to `git web--browse`, which is less than perfect
+when it comes to finding the right browser.  You can tell it the correct
+browser to use with `git config --global web.browser ...`.  On OS X, for
+example, you might want to set this to `open`.  See `git web--browse --help`
+for details.
+
+> Here's a patch that automatically opens the quickfix window after
+> `:Ggrep`.
+
+This is a great example of why I recommend asking before patching.
+There are valid arguments to be made both for and against automatically
+opening the quickfix window.  Whenever I have to make an arbitrary
+decision like this, I ask what Vim would do.  And Vim does not open a
+quickfix window after `:grep`.
+
+Luckily, it's easy to implement the desired behavior without changing
+fugitive.vim.  The following autocommand will cause the quickfix window
+to open after any grep invocation:
+
+    autocmd QuickFixCmdPost *grep* cwindow
+
+## Self-Promotion
 
 Like fugitive.vim? Follow the repository on
-[GitHub](http://github.com/tpope/vim-fugitive) and vote for it on
-[vim.org](http://www.vim.org/scripts/script.php?script_id=2975).
+[GitHub](https://github.com/tpope/vim-fugitive) and vote for it on
+[vim.org](http://www.vim.org/scripts/script.php?script_id=2975).  And if
+you're feeling especially charitable, follow [tpope](http://tpo.pe/) on
+[Twitter](http://twitter.com/tpope) and
+[GitHub](https://github.com/tpope).
+
+## License
+
+Copyright (c) Tim Pope.  Distributed under the same terms as Vim itself.
+See `:help license`.

doc/fugitive.txt

@@ -1,38 +1,14 @@
 *fugitive.txt*  A Git wrapper so awesome, it should be illegal
 
-Author:  Tim Pope <vimNOSPAM@tpope.info>        *fugitive-author*
+Author:  Tim Pope <http://tpo.pe/>
 License: Same terms as Vim itself (see |license|)
 
 This plugin is only available if 'compatible' is not set.
 
 INTRODUCTION                                    *fugitive*
 
-Install in ~/.vim, or in ~\vimfiles if you're on Windows and feeling lucky.
-Vim 7.2 is recommended as it ships with syntax highlighting for many Git file
-types.
-
-If you're in a hurry to get started, here are some things to try:
-
-In any file in your repository, run |:Gedit| HEAD.  Press <CR> to jump to the
-current branch.  Press <CR> again to jump to the top most commit.  Keep using
-<CR> to explore parent commits, trees, and blobs.  Use C in a tree or blob to
-get back to the commit.
-
-Edit a file in the work tree and make some changes.  Use |:Gdiff| to open up
-the indexed version.  Use |do| and |dp| on various hunks to bring the files in
-sync, or use |:Gread| to pull in all changes.  Write the indexed version to
-stage the file.
-
-Run |:Gstatus| to check your repository's status.  Use "-" to stage and reset
-files and "p" to add/reset --patch them.  Invoke |:Gcommit| to commit your
-changes.
-
-Run |:Gblame| in a work tree file to see a blame in a vertical split.  Press
-<CR> on any line to reopen and reblame that file as it stood in that commit.
-Press o or O on any line to inspect that commit in a split or a tab.
-
-Run |:Ggrep| to search the work tree or history.  Run |:Gmove| to rename a
-file.  Run |:Gremove| to delete a file.
+Whenever you edit a file from a Git repository, a set of commands is defined
+that serve as a gateway to Git.
 
 COMMANDS                                        *fugitive-commands*
 
@@ -43,6 +19,10 @@ that are part of Git repositories).
 :Git [args]             Run an arbitrary git command. Similar to :!git [args]
                         but chdir to the repository tree first.
 
+                                                *fugitive-:Git!*
+:Git! [args]            Like |:Git|, but capture the output into a temp file,
+                        and edit that temp file.
+
                                                 *fugitive-:Gcd*
 :Gcd [directory]        |:cd| relative to the repository.
 
@@ -51,32 +31,87 @@ that are part of Git repositories).
 
                                                 *fugitive-:Gstatus*
 :Gstatus                Bring up the output of git-status in the preview
-                        window.  Press D to |:Gdiff| the file on the cursor
-                        line.  Press - to stage or unstage the file on the
-                        cursor line.  Press p to do so on a per hunk basis
-                        (--patch).  Press C to invoke |:Gcommit|.
+                        window.  The following maps, which work on the cursor
+                        line file where sensible, are provided:
+
+                        g?    show this help
+                        <C-N> next file
+                        <C-P> previous file
+                        <CR>  |:Gedit|
+                        -     |:Git| add
+                        -     |:Git| reset (staged files)
+                        cA    |:Gcommit| --amend --reuse-message=HEAD
+                        ca    |:Gcommit| --amend
+                        cc    |:Gcommit|
+                        cva   |:Gcommit| --amend --verbose
+                        cvc   |:Gcommit| --verbose
+                        D     |:Gdiff|
+                        ds    |:Gsdiff|
+                        dp    |:Git!| diff (p for patch; use :Gw to apply)
+                        dp    |:Git| add --intent-to-add (untracked files)
+                        dv    |:Gvdiff|
+                        O     |:Gtabedit|
+                        o     |:Gsplit|
+                        p     |:Git| add --patch
+                        p     |:Git| reset --patch (staged files)
+                        q     close status
+                        r     reload status
+                        S     |:Gvsplit|
 
                                                 *fugitive-:Gcommit*
 :Gcommit [args]         A wrapper around git-commit.  If there is nothing
                         to commit, |:Gstatus| is called instead.  Unless the
                         arguments given would skip the invocation of an editor
                         (e.g., -m), a split window will be used to obtain a
-                        commit message.  Write and close that window (:wq or
-                        |:Gwrite|) to finish the commit.  Unlike when running
-                        the actual git-commit command, it is possible (but
-                        unadvisable) to muck with the index with commands like
-                        git-add and git-reset while a commit message is
-                        pending.
+                        commit message, or a new tab if -v is given.  Write
+                        and close that window (:wq or |:Gwrite|) to finish the
+                        commit.  Unlike when running the actual git-commit
+                        command, it is possible (but unadvisable) to alter the
+                        index with commands like git-add and git-reset while a
+                        commit message is pending.
+
+                                                *fugitive-:Gmerge*
+:Gmerge [args]          Calls git-merge and loads errors and conflicted files
+                        into the quickfix list.  Opens a |:Gcommit| style
+                        split window for the commit message if the merge
+                        succeeds.  If called during a merge conflict, the
+                        conflicted files from the current index are loaded
+                        into the quickfix list.
+
+                                                *fugitive-:Gpull*
+:Gpull [args]           Like |:Gmerge|, but for git-pull.
+
+                                                *fugitive-:Gpush*
+:Gpush [args]           Invoke git-push, load the results into the quickfix
+                        list, and invoke |:cwindow| to reveal any errors.
+                        |:Dispatch| is used if available for asynchronous
+                        invocation.
+
+                                                *fugitive-:Gfetch*
+:Gfetch [args]          Like |:Gpush|, but for git-fetch.
 
                                                 *fugitive-:Ggrep*
 :Ggrep [args]           |:grep| with git-grep as 'grepprg'.
 
+                                                *fugitive-:Glgrep*
+:Glgrep [args]          |:lgrep| with git-grep as 'grepprg'.
+
                                                 *fugitive-:Glog*
 :Glog [args]            Load all previous revisions of the current file into
                         the quickfix list.  Additional git-log arguments can
                         be given (for example, --reverse).  If "--" appears as
                         an argument, no file specific filtering is done, and
-                        commits are loaded into the quickfix list.
+                        previous commits rather than previous file revisions
+                        are loaded.
+
+:{range}Glog [args]     Use git-log -L to load previous revisions of the given
+                        range of the current file into the quickfix list.  The
+                        cursor is positioned on the first line of the first
+                        diff hunk for each commit.
+
+                                                *fugitive-:Gllog*
+:Gllog [args]           Like |:Glog|, but use the location list instead of the
+                        quickfix list.
 
                                         *fugitive-:Gedit* *fugitive-:Ge*
 :Gedit [revision]       |:edit| a |fugitive-revision|.
@@ -88,10 +123,15 @@ that are part of Git repositories).
 :Gvsplit [revision]     |:vsplit| a |fugitive-revision|.
 
                                                 *fugitive-:Gtabedit*
-:Gtabedit [revision]    |:tabedit| a |fugitive-revision|
+:Gtabedit [revision]    |:tabedit| a |fugitive-revision|.
 
                                                 *fugitive-:Gpedit*
-:Gpedit [revision]      |:pedit| a |fugitive-revision|
+:Gpedit [revision]      |:pedit| a |fugitive-revision|.
+
+:Gsplit! [args]                 *fugitive-:Gsplit!* *fugitive-:Gvsplit!*
+:Gvsplit! [args]                *fugitive-:Gtabedit!* *fugitive-:Gpedit!*
+:Gtabedit! [args]       Like |:Git!|, but open the resulting temp file in a
+:Gpedit! [args]         split, tab, or preview window.
 
                                                 *fugitive-:Gread*
 :Gread [revision]       Empty the buffer and |:read| a |fugitive-revision|.
@@ -103,9 +143,12 @@ that are part of Git repositories).
                         |:read| in a |fugitive-revision| after {range}.
 
                                                 *fugitive-:Gread!*
-:Gread! [revision]      Deprecated synonym for |:Gread|.
+:Gread! [args]          Empty the buffer and |:read| the output of a Git
+                        command.  For example, :Gread! show HEAD:%.
 
-                                                *fugitive-:Gwrite*
+:{range}Gread! [args]  |:read| the output of a Git command after {range}.
+
+                                        *fugitive-:Gw* *fugitive-:Gwrite*
 :Gwrite                 Write to the current file's path and stage the results.
                         When run in a work tree file, it is effectively git
                         add.  Elsewhere, it is effectively git-checkout.  A
@@ -118,14 +161,29 @@ that are part of Git repositories).
                         :0:foo.txt or even :0 to write to just that stage in
                         the index.
 
+                                                *fugitive-:Gwq*
+:Gwq [path]             Like |:Gwrite| followed by |:quit| if the write
+                        succeeded.
+
+:Gwq! [path]            Like |:Gwrite|! followed by |:quit|! if the write
+                        succeeded.
+
                                                 *fugitive-:Gdiff*
 :Gdiff [revision]       Perform a |vimdiff| against the current file in the
                         given revision.  With no argument, the version in the
                         index is used (which means a three-way diff during a
                         merge conflict, making it a git-mergetool
                         alternative).  The newer of the two files is placed
-                        to the right.  Use |do| and |dp| and write to the
-                        index file to simulate "git add --patch".
+                        to the right or bottom, depending on 'diffopt' and
+                        the width of the window relative to 'textwidth'.  Use
+                        |do| and |dp| and write to the index file to simulate
+                        "git add --patch".
+
+                                                *fugitive-:Gsdiff*
+:Gsdiff [revision]      Like |:Gdiff|, but always split horizontally.
+
+                                                *fugitive-:Gvdiff*
+:Gvdiff [revision]      Like |:Gdiff|, but always split vertically.
 
                                                 *fugitive-:Gmove*
 :Gmove {destination}    Wrapper around git-mv that renames the buffer
@@ -141,15 +199,71 @@ that are part of Git repositories).
 
                                                 *fugitive-:Gblame*
 :Gblame [flags]         Run git-blame on the file and open the results in a
-                        scroll bound vertical split.  Press enter on a line to
-                        reblame the file as it was in that commit.  You can
-                        give any of ltwfsMC as flags and they will be passed
-                        along to git-blame.
+                        scroll bound vertical split.  You can give any of
+                        ltfnsewMC as flags and they will be passed along to
+                        git-blame.  The following maps, which work on the
+                        cursor line commit where sensible, are provided:
+
+                        g?    show this help
+                        A     resize to end of author column
+                        C     resize to end of commit column
+                        D     resize to end of date/time column
+                        q     close blame and return to blamed window
+                        gq    q, then |:Gedit| to return to work tree version
+                        <CR>  q, then open commit
+                        o     open commit in horizontal split
+                        O     open commit in new tab
+                        -     reblame at commit
+                        ~     reblame at [count]th first grandparent
+                        P     reblame at [count]th parent (like HEAD^[count])
 
 :[range]Gblame [flags]  Run git-blame on the given range.
 
+                                                *fugitive-:Gbrowse*
+:Gbrowse                Open the current file, blob, tree, commit, or tag
+                        in your browser at the upstream hosting provider
+                        indicated by the "origin" remote.  If a range is
+                        given, it is appropriately appended to the URL as an
+                        anchor.
+
+                        Upstream providers can be added by installing an
+                        appropriate Vim plugin.  For example, GitHub can be
+                        supported by installing rhubarb.vim, available at
+                        <https://github.com/tpope/vim-rhubarb>.  (Native
+                        support for GitHub is currently included, but that is
+                        slated to be removed.)
+
+                        If no upstream support is available, a local instance
+                        of git-instaweb will be started and used instead.
+
+:Gbrowse {revision}     Like :Gbrowse, but for a given |fugitive-revision|.  A
+                        useful value here is -, which ties the URL to the
+                        latest commit rather than a volatile branch.
+
+:Gbrowse [...]@{remote} Force using the given remote rather than the remote
+                        for the current branch.  The remote is used to
+                        determine which GitHub repository to link to.
+
+:{range}Gbrowse [args]  Appends an anchor to the URL that emphasizes the
+                        selected lines.  You almost certainly want to give a
+                        "-" argument in this case to force the URL to include
+                        an exact revision.
+
+:[range]Gbrowse! [args] Like :Gbrowse, but put the URL on the clipboard rather
+                        than opening it.
+
 MAPPINGS                                        *fugitive-mappings*
 
+These maps are available everywhere.
+
+                                                *fugitive-c_CTRL-R_CTRL-G*
+<C-R><C-G>              On the command line, recall the path to the current
+                        object (that is, a representation of the object
+                        recognized by |:Gedit|).
+
+                                                *fugitive-y_CTRL-G*
+["x]y<C-G>              Yank the commit SHA and path to the current object.
+
 These maps are available in Git objects.
 
                                                 *fugitive-<CR>*
@@ -158,9 +272,16 @@ These maps are available in Git objects.
                                                 *fugitive-o*
 o                       Jump to the revision under the cursor in a new split.
 
+                                                *fugitive-S*
+S                       Jump to the revision under the cursor in a new
+                        vertical split.
+
                                                 *fugitive-O*
 O                       Jump to the revision under the cursor in a new tab.
 
+                                                *fugitive--*
+-                       Go to the tree containing the current tree or blob.
+
                                                 *fugitive-~*
 ~                       Go to the current file in the [count]th first
                         ancestor.
@@ -171,6 +292,10 @@ P                       Go to the current file in the [count]th parent.
                                                 *fugitive-C*
 C                       Go to the commit containing the current file.
 
+                                                *fugitive-.*
+.                       Start a |:| command line with the current revision
+                        prepopulated at the end of the line.
+
                                                 *fugitive-a*
 a                       Show the current tag, commit, or tree in an alternate
                         format.
@@ -211,6 +336,12 @@ a statusline, this one matches the default when 'ruler' is set:
 >
     set statusline=%<%f\ %h%m%r%{fugitive#statusline()}%=%-14.(%l,%c%V%)\ %P
 <
+                                                *fugitive#head(...)*
+Use fugitive#head() to return the name of the current branch. If the current
+HEAD is detached, fugitive#head() will return the empty string, unless the
+optional argument is given, in which case the hash of the current commit will
+be truncated to the given number of characters.
+
 ABOUT                                           *fugitive-about*
 
 Grab the latest version or report a bug on GitHub: