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* Suppress the problematic trap output in check_upg

The newly added trap, in systems where `rm` is aliased to `rm="rm -v"`,
shows a message stating that "update.lock" has been removed each time `zsh` is called.
I simply suppressed it with directing the output to `/dev/null`.

* Use `command` instead of >/dev/null to suppress

Changing 'your' to 'you'

Co-authored-by: Marc Cornellà <marc.cornella@live.com>

Fixes #8732

See https://github.com/ohmyzsh/ohmyzsh/pull/7172#issuecomment-592875226

If I have custom configs (like theme customizations) I have to stash my changes and get them back after the update. 

By adding the --autostash on upgrade.sh, if I have any changes not commited they'll be reapplied after the upgrade, allowing me to have temporary customizations without any harm to the upgrade process.

* Add option to install OMZ without replacing .zshrc

tools/install.sh respects REPLACE_RC environment variable
--noreplace-rc flag sets REPLACE_RC='no'

* Change REPLACE_RC=no to KEEP_ZSHRC=yes

Change --noreplace-rc to --keep-zshrc

If there's no `~/.shell.pre-oh-my-zsh`, don't assume the default choice
is Bash.  In fact Zsh is the default shell for macOS since Catalina
(10.15) [1], yet users of other OSes have likely to have Bash as their
default.

This commit fix issue #8252

[1] https://support.apple.com/en-us/HT208050

Fixes #8416

* Change project URL from robbyrussell to ohmyzsh org

* Update git remote to use ohmyzsh org repository

- core.autocrlf=false -> #4069
- fsck.zeroPaddedFilemode -> #4963

Fixes #4069
Fixes #4963

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

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.