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ahead and diverged remote, I added ZSH_THEME_GIT_PROMPT_EQUAL_REMOTE.

This adds two new theme functions for git:
* `git_prompt_behind` works in a identical fashion to `git_prompt_ahead`
  and will output a format variable (`ZSH_THEME_GIT_PROMPT_BEHIND`) if
  the branch is behind.
* `git_prompt_remote` will output one format variable if the branch
  exists on remote (`ZSH_THEME_GIT_PROMPT_REMOTE_EXISTS`), and another
  if the branch is unpublished (`ZSH_THEME_GIT_PROMPT_REMOTE_MISSING`).

The old `git_prompt_ahead` has been changed. Using git log is subject
to formatting in .gitconfig, which can be overridden and will break
this function. Relying on rev-list is much more stable.

Commit 81004dfa reverted the change
in 9b811fb6 when editing the merge
conflict from #2928.

This commit fixes that so that we don't make the same mistake again.

First seen in http://git.io/Cdaj5Q

Merged from #2906

The function `git_prompt_info` calls `git config` for its stdout output,
but doesn't handle the stderr output.  This can lead to problems,
e.g. if the git config file is unreadable for some reason (permissions
etc).

This fixes the issue by simply ignoring the stderr output.

Signed-off-by: Mikhail S. Pobolovets <styx.mp@gmail.com>

before, 128 was returned, which could display an error,
but out of a git repo this should exit silently
fixes #2226

replaced hardcoded origin/{branch-name} with @{upstream} which gets the upstream branch since git 1.7.0

accidentally blew away a git config setting used for another purpose, renaming in order to distinguish

In this commit, the option only works for git but it should not be to hard for
someone who knows svn to so the same.
This commit is largely inspired by @yoavweiss, I only added an option to use
it.

If oh-my-zsh.hide-status is configured, the 'clean' code won't be
generated, and some themes might end up distorted. Let's generate the
'clean' code even when we don't want the show the dirty status.
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>

The grep expression was incorrect for normal grep. Adding
the `-E` option fixed the escaping of the question marks.

Tweaked parse_git_dirty() in lib/git.zsh to support proper dirty/clean parsing against both git 1.6 and git 1.7+

# Changes to be committed:
#   (use "git reset HEAD <file>..." to unstage)
#
#	modified:   git.zsh
#, ignoring untracked files, which seems to be the primary cause for slowness

This patch makes git_prompt_status support three new status variables:

 - ZSH_THEME_GIT_PROMPT_AHEAD
 - ZSH_THEME_GIT_PROMPT_BEHIND
 - ZSH_THEME_GIT_PROMPT_DIVERGED

With these extra variables it's easy to see (1) if you have commits in
your local branch that weren't pushed to the remote (AHEAD), (2) if
there are commits in the remote that you haven't merged/rebased yet
(BEHIND) or (3) if you have local unpushed commits AND the remote has
some commits you haven't merged yet (DIVERGED).

Refer to the first line displayed on `git status -b --porcelain`.

An example setup in a .zsh-theme file would be:

ZSH_THEME_GIT_PROMPT_AHEAD="↑"
ZSH_THEME_GIT_PROMPT_BEHIND="↓"
ZSH_THEME_GIT_PROMPT_DIVERGED="↕"

For certain git repositories, this slows down usage
of the shell horifically.

This option can be set with

    git config --add oh-my-zsh.hide-status 1

which will disable checking/showing the status notification