Return '' from buffer.path() if outside work tree

In reference to #278.

.gitignore

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

README.markdown

@@ -11,13 +11,14 @@ 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
+Bring up the output of `git status` with `:Gstatus`.  Press `-` to
 `add`/`reset` a file's changes, or `p` to `add`/`reset` `--patch` that
 mofo.  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.
+commit, or `o` to open that commit 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 +36,115 @@ 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, I recommend
+installing [pathogen.vim](https://github.com/tpope/vim-pathogen), and
+then simply copy and paste:
+
+    cd ~/.vim/bundle
+    git clone git://github.com/tpope/vim-fugitive.git
+
+Once help tags have been generated, you can view the manual with
+`:help fugitive`.
+
+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
+
+Contributing
+------------
+
+Before reporting a bug, you should try stripping down your Vim
+configuration and removing other plugins.  The sad nature of 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.
+
+If your [commit message sucks](http://stopwritingramblingcommitmessages.com/),
+I'm not going to accept your pull request.  I've explained very politely
+dozens of times that
+[my general guidelines](http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html)
+are absolute rules on my own repositories, so I may lack the energy to
+explain it to you yet another time.  And please, if I ask you to change
+something, `git commit --amend`.
+
+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.
+
+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.
 
@@ -51,10 +31,31 @@ 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:
+
+                        <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
@@ -71,12 +72,20 @@ that are part of Git repositories).
                                                 *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.
+
+                                                *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 +97,15 @@ 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 +117,12 @@ 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
@@ -118,6 +135,13 @@ 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
@@ -127,6 +151,12 @@ that are part of Git repositories).
                         to the right.  Use |do| and |dp| and write to the
                         index file to simulate "git add --patch".
 
+                                                *fugitive-:Gsdiff*
+:Gsdiff [revision]      Like |:Gdiff|, but split horizontally.
+
+                                                *fugitive-:Gvdiff*
+:Gvdiff [revision]      Identical to |:Gdiff|.  For symmetry with |:Gsdiff|.
+
                                                 *fugitive-:Gmove*
 :Gmove {destination}    Wrapper around git-mv that renames the buffer
                         afterward.  The destination is relative to the current
@@ -143,13 +173,63 @@ that are part of Git repositories).
 :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.
+                        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:
+
+                        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
+                        i     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*
+:[range]Gbrowse         If the remote for the current branch is on GitHub,
+                        open the current file, blob, tree, commit, or tag
+                        (with git-web--browse) on GitHub.  Otherwise, open the
+                        current file, blob, tree, commit, or tag in
+                        git-instaweb (if you have issues, verify you can run
+                        "git instaweb" from a terminal).  If a range is given,
+                        it is appropriately appended to the URL as an anchor.
+
+                        To use with GitHub FI, point g:fugitive_github_domains
+                        at a list of domains:
+>
+                        let g:fugitive_github_domains = ['https://example.com']
+~
+:[range]Gbrowse!        Like :Gbrowse, but put the URL on the clipboard rather
+                        than opening it.
+
+:[range]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.
+
+:[range]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.
+
 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 +238,16 @@ 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.
@@ -211,6 +298,12 @@ 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: