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Includes completions for `git switch`.

An error was thrown (`bash: [: =: unary operator expected`) when using the __git_ps1_colorize_gitstring function outside of the one place it's called (line 512), because the "detached" variable was not quoted, and was unset.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>

* gitfast: use $OSTYPE again

In the last update to upstream this was reverted:

 a56eac7a

 (Use OSTYPE instead of uname whenever possible for better speed. (#5496))
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>

* gitfast: simplify plugin

No need to set and unset a variable we use once.
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>

* gitfast: add script to update from upstream

This would make easier the process of updating, and also not miss our
patches.
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>

* gitfast: update to upstream v2.21
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>

* Stop loading git plugin
* Update completion and git-prompt to v2.10
* Update completion to v2.14

* Create gitfast readme

* Add list of gitfast aliases

Sometimes we want to use the function directly (e.g. _git_checkout), for
example when zsh has the option 'complete_aliases', this way, we can do
something like:

  compdef _git gco=git_checkout
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>

We can add colour in Zsh without the need of pcmode.
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>

Previously, spaces in the path would result in wto separate errouneous
paths being parsed. This fixes that issue.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>

Certain themes need the 'clean' mark, and some people like to have the
'dirty' one, just like the original git_promp_info().

We probably shouldn't be modifying that function, there's no other clean
way to achieve our own status information, so let's try to emulate the
original as much as possible.
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>

Up to version 1.8.2.1.
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>

When showing the char % for untracket files, it was not being escaped
so there was shown a space in the place. It was also removing any char
that was right just after.

Using the upstream git completion and prompt stuff.
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>