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* Use double quotes to cache value of $apt_pref and $apt_upgr
* Clean up and fix syntax of command checks
* Clean up README and document $apt_pref/$apt_upgr overriding mechanism
* Rename `ag` alias (apt upgrade) to `au`
* Clean up README and fix syntax

Fixes #3686 
Fixes #4660 
Closes #5906
Co-authored-by: Noah Vesely <fowlslegs@riseup.net>

Zsh may be configured such that ">>" will error if the file doesn't exist (`setopt noclobber`). 

tput is error-prone and may not be needed, since all the formatting
codes used are standard across all types of terminals.

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>

installer: fix, refactor and add installer arguments

tput may throw errors on invalid $TERM values, for example.
This shorthand syntax allows for that as well as for if tput
doesn't exist.

Co-authored-by: Antonio QUINTAVALLE <antonio.quintavalle@amadeus.com>
Co-authored-by: Marc Cornellà <marc.cornella@live.com>

Co-authored-by: Liquidsoul <liquidsoul@liquidsoul.fr>
Co-authored-by: Alexander Polynomdivision <digitalmail555@googlemail.com>
Co-authored-by: loket <loket@cruftlab.io>
Co-authored-by: Connor Demille <subtlepseudonym@gmail.com>

Co-authored-by: Joel Kuzmarski <leoj3n@gmail.com>

Co-authored-by: Marshall Ford <inbox@marshallford.me>
Co-authored-by: Joel Kuzmarski <leoj3n@gmail.com>

Supposed to be POSIX-compatible. Proved to work in dash, yash and whatever
alpine uses. See https://unix.stackexchange.com/a/371873

This facilitates testing of changes to the core installation code: you'll be
able to do a roundtrip test of install and uninstall using the working code on
your branch.

Controlled by passing $REPO and $BRANCH environment variables to install.sh.

This changes the behavior to default to the binary found first in $PATH,
then checking it's actually in the shells file (/etc/shells).

If that fails go back to the previous behavior, but actually check that
the path obtained exists in the filesystem.
Co-authored-by: Joel Kuzmarski <leoj3n@gmail.com>

Co-authored-by: Fredrik Fornwall <fredrik@fornwall.net>

Guard clauses are if constructs that return early if there is an error
that prevents continuing. This way there isn't a big nesting of if
expressions.

Otherwise we risk a situation where a full path to `zsh` is commented, i.e.:

    #/usr/local/bin/zsh

This replaces the currently running process with the new one using `exec`
instead of creating a new process. This way, when the user `exit`s out of
the new shell it will not pop them back into the shell from which ohmyzsh
was installed from.

This will allow us to use tab stripping heredocs with `<<-'.
See http://www.tldp.org/LDP/abs/html/here-docs.html#EX71A

Add editorconfig file to enforce this style.
See http://editorconfig.org for more information.

For the `v` alias to work in its current state, the environment variable
EDITOR must already be defined by the time `source $ZSH/oh-my-zsh.sh`
happens. However, in the included zshrc template, EDITOR is set from
within the "User configuration" section, which begins immediately after
the above line. This means that, unless the user knows to move their
`export EDITOR` statements, EDITOR will be undefined when fasd.plugin.zsh
loads, and therefore the alias will have the value 'f -e ""', preventing
it from functioning.

With this change, `"$EDITOR"` will be evaluated each time the alias is
invoked, instead of just once when the alias is created. This allows for
EDITOR to be set from "User configuration" in the zshrc, and has the
additional flexibility of allowing a user to specify a different EDITOR
for a single session or invocation of the alias.

Fixes #7886

- Get the iTunes volume without an argument
- Shift up / down iTunes volume

See https://github.com/robbyrussell/oh-my-zsh/pull/6731#issuecomment-449653115