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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.

This early return made it so the lock wasn't removed, therefore locking out
the upgrade script from ever entering the upgrade routine.

Fixes #6138 

Note: the logic needs some rework.

* Updating Oh My Zsh shop URLs

Linking directly to the Oh My Zsh inventory vs the top-level store with non-OMZ items.

* Updating link to Oh My Zsh products in the install script

* Updating link to Oh My Zsh shop products in the upgrade script

* Getting rid of 't-' in shirts for now

Fixes #7492

* use https everywhere

* use https links on the files that are left

Also, removed some broken links and updated redirections.

Otherwise these files are not sourced:
  1. /etc/zprofile
  2. ~/.zprofile
  3. /etc/zlogin
  4. ~/.zlogin
  5. ~/.zlogout
  6. /etc/zlogout

Quote $ZSH where necessary in install script

`[Oh My Zsh] Would you like to check for updates? [Y/n]: ` does not make sense, 
since answering yes will download/apply the new updates instead of checking for them.

Fixes #4955

Closes #5931
Closes #6398
Co-authored-by: Void <vst4rbot@gmail.com>
Co-authored-by: Kaleb Elwert <belak@coded.io>

Quick fix to the script not finding git due to hash.
Solves #6697.

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

See robbyrussell@b67961d

When the user is asked to update oh-my-zsh it says "[Oh My Zsh] Would
you like to check for updates? [Y/n]:". When the user agreed to update
the next text would say "Upgrading Oh My Zsh" which is inconsistent
with the question.

 - Need dot `.` for POSIX compliant instead of `source`
 - Use modern syntax for command substitution
 - Fix missing double quotes

Really this time :P

Fixes #4533

We need to use POSIX syntax. This file is no longer executed with zsh.

Fixes #4483.

Drops the `function` keyword and uses only `func(){}` syntax as per the
POSIX specification:

http://pubs.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_09_05

Related: #4531

This reverts commit c9d93757, which
makes it fail with a syntax error:

  sh: 1: Syntax error: "(" unexpected