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* 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

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

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.

See robbyrussell@b67961d

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

This is a hack to keep the installer working on systems without tput/terminfo.

Fixes issue #4376

* Balk at incompatible Windows/MSYS git
* Test for chsh presence before trying to use it
* Replace non-portable `[[ ... ]]` and `[ x = *pattern* ]` constructs

Check if Zsh is installed before installing anything else.
New-commers, or people who don't read the disclaimers(ex. me) will go
straight to stack overflow if chsh -s returns an error.

Installation previously assumed the existence of a "chsh" command in the current
${PATH}. Since Cygwin does *NOT* provide this command, installation now tests
for the existence of this command before attempting to run it.

For safety, a umask of 022 prohibiting both group and other writability is now
enforced during OMZ installation. In theory, this should reduce the likelihood
of subsequent compinit() failures due to insecure directory permissions under
all platforms except for default Cygwin installations (in which Windows ACLs
override POSIX umasks).

Do not use terminal visual effects if not connected to a terminal.

fix test for chsh in install
in case $SHELL is zsh but not the last one in /etc/shells
fixes #3026 fixes #3779 fixes #3780

install.sh: Replace nonstandard "sed -i" with sed + mv commands. Makes portable to systems whose sed lacks "-i", like OpenBSD.

Use `--depth=1` to clone just the lastest version rather than every version in git.

Some environments (such as Android) does not have /usr/bin.

The intention of the redirection to /dev/null is to hide the output
'hash: no such command: git' since we rely on the exit status.

However, the output goes to stderr, so it's stderr that needs to be
redirected. For completeness, we redirect both stderr and stdout using
'2>&1'.

Example:

  [~]$ hash git > /dev/null
  [~]$ PATH=''
  [~]$ hash git > /dev/null
  hash: no such command: git
  [~]$ hash git > /dev/null 2>&1
  [~]$

Fixing a few quirks in the latest installer updates (quoting /Users/robbyrussell/.oh-my-zsh and such). Also mentioining our twitter account after install

Although the zshrc template adds a PATH= string, this is overwritten by the installer script.
This allows it to be placed anywhere in the file instead of having to append at the end.