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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

This changeset wraps all of the commands in tools/install.sh in a
function and then calls that function as the last line of the
script.

The current install instructions ask the user to download the install
script using `curl` and pass the result to `sh`. This is totally
fine (as long as both the instructions and the script itself are served
using HTTPS), but the script should be written in a way such that it
doesn't start trying to actually *do* anything until the very last line.

The reason is due to the way `curl` work: if the socket drops before the
request is complete (server abruptly hangs up, client's internet flakes
out, etc.), `curl` will return the partial data that it received. Here
is an example of that:

![partial file execution](https://cldup.com/qU_Mnh2GmT.png)

A way this might cause issues for tools/install.sh is if the connection drops
after cloning but before the repository (L53-56). The .zshrc
configuration will not be copied and the shell will not be changed, but
if the user tries to run the install script again it will claim
oh-my-zsh is already installed (L31-39).

While this is not a particularly dangerous error condition (the user can
just delete .oh-my-zsh and re-run), it can certainly be confusing for
new users. This also helps future-proof the script for a time when it
might need to use a "dangerous" command, e.g. `rm`, and we want to make
sure it happens in the most transactional way possible.

@fcrozat's original fix assumes `which` not to output anything to STDOUT
in case the command is not found. That is not necessarily true on all
systems. A better solution is to check the return value instead.

Fixes #4376