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`gls` seems to be installed by default or on most macOS systems, but its
default color scheme sucks. This fix will make sure to only use it if it
has been customised prior to running OMZ.

Related: #5516, #5520.

Fixes #5520.

Also, force the use of Bourne-style shell syntax with `dircolors -b`.

GNU coreutils ship a color setup command by default which can be used to
set a good default color theme for ls:

  https://www.gnu.org/software/coreutils/manual/html_node/dircolors-invocation.html

This deletes the previous hack that allowed completing files with
the extension: e.g. `abcd.z` to `abcdefg.z`.

It is still possible to use `abcd[TAB].z`, and hyphens or underscores
are very much more important than this other trick.

Source:
https://github.com/robbyrussell/oh-my-zsh/issues/1398#issuecomment-169163149

Signed-off-by: Marc Cornellà <marc.cornella@live.com>

This fixes old git_commits_ahead behavior and changes git_commits_behind
to have the same behavior.

Fixes #5355

This makes things work even on system lacking /bin/sh, such as on
non-rooted Android systems.

* Export $NVM_DIR if it doesn't exist and use it when looking for nvm
* Use $NVM_DIR when looking for nvm for completion
* Use $NVM_DIR when looking for nvm in nvm_prompt_info

* Function wasn't returning correct value
* Updated underlying git command
* Kept echo command from previous function for backwards compatibility
* Kept function consistent with git_commits_behind

* Added git_commits_behind function
* Added 'command' to git_commits_behind function
* git_commits_behind code review changes

Fixes weird autocompletion of directories and named users.
Fix #4864

Re-added $ZSH_THEME_GIT_PROMPT_EQUAL_REMOTE variable which was removed in 9f552130

In places, the local statement will override the exit code and the written
command won't have the effect intended when it was written.

For example, when it's not inside a git repo the exit code won't be true,
but the local statement will make it true regardless. See #4708.

Fixes #4085: core -> plugin dependency issue.
Rename it to git_current_branch for clarity that it's git-specific.
Update all plugins that were calling it to use new name.
Fix variable leaks by making more variables in lib/git.zsh local.
Have lib/git.zsh use [[ ]] instead of [ ] everywhere.

Currently, the title is only set on supported terminals (i.e. xterm,
urxvt, screen etc.). Using terminfo entries to set the terminal title
adds support for many more terminals.

This change enables UP-arrow and DOWN-arrow full-line history completion.
For example, if you write `git clone` and press UP:

- Before this change,
  it will use the last command that starts with `git`.

- After this change,
  it will use the last command that starts with `git clone`.

The alias was removed in #3564. A couple of users were using
it, so I'm adding it back.

Otherwise `start` will confuse the first parameter as the title of
a new command prompt if the parameter contains whitespace. That is
because the command to be run will be:

    start "abc def"

which opens a new command prompt window with the title "abc def".
With the added empty string we force the start command to interpret
the passed parameter as the file / command:

    start "" "abc def"

which will be interpreted like `""` is the title and the rest is
the file or command to start.

-------

**NOTE:** this wouldn't be necessary if the start script in msys
was defined differently; that is, if it had the empty string
already incorporated in the script (/usr/bin/start), like so:

```diff
-cmd //c start "${@//&/^&}"
+cmd //c start "" "${@//&/^&}"
```

Notice however that this would make it impossible to use start
setting a different title, so it's probably best to leave it as is.

More info: http://sourceforge.net/p/msys2/tickets/14/

-------

The change `${(z)open_cmd}` is necessary to force zsh to split the
variable by the spaces and interpret it as separate words.

More info: http://zsh.sourceforge.net/FAQ/zshfaq03.html#l17

Added an option for the msys value of $OSTYPE

There a syntax error if $cmd_var contains more than one word,
so we drop the current way to prepend nohup and use a simpler
if-else form.

Apparently `nohup` is not needed in OSX, and using it has the side
that it may break under tmux with the error

  nohup: can't detach from console: No such file or directory

For now, this commit only drops the use of `nohup` in OSX. But it
*may* not be necessary under other similar platforms.