Closes #5085
Closes #7451
Closes #7265
Fixes #8444
Closes #8445

- Move grep-alias path to variable.
- Use <<< "" instead of piped echo to check grep flags.
- Remove check for --color only since it's the same release as --exclude.

This version tries whether grep supports all the flags together
and progressively checks older flags if the grep test fails.
This means only one grep call if all flags are supported, and
one additional call for every flag that's not supported, up to
a maximum of 3 calls.

- Use $ZSH_CACHE_DIR to store the grep alias with all the right features
- Expire the cache after 24 hours
- See issue #8444

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

* Add trailing new line at the end of output
* Double-quote variable expansion

It should be `--rerun-tasks`, the original one miss a 's' at the end.
See https://docs.gradle.org/current/userguide/command_line_interface.html

Using `fasd —-init auto` will first detect terminal and then call
fasd again to generate the final initialisation script. Caching that gives a more significant performance boost.

Apple's Terminal doesn't open a new tab in your current directory if your hostname has UTF-8 characters in it. Percent encoding the host in addition to the path in update_terminalapp_cwd appears to solve this issue.

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

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

Source: https://github.com/microsoft/WSL/issues/4852#issuecomment-579616808

Fixes Completion only working for first parameter

This allows other plugins that hook e.g. accept-line to identify the
fancy-ctrl-z widget as the caller and take appropriate steps when
necessary.

See https://github.com/tarruda/zsh-autosuggestions/issues/82#issuecomment-181133379

Closes #6243

* clipboard: Reduce unnecessary special-casing on stdin

Ideally the parameter would just be removed-users could always
just do "clipcopy < some-file". but removing the parameter would break
backwards compatibility.

In any case, this simplifies the logic considerably.

* clipboard: Avoid unnecessary re-detection each time

Previously, OS detection would happen on each invocation. This makes it
happen once (unless it fails, in which case it will try again on the
next invocation).

This has the additional benefit of localizing the platform-specific
checks and commands, too, versus spreading them out in separate
functions.

* clipboard: Add support for several more clipboards

This implements essentially the same heuristic as neovim, with the additional
(existing) special support for Cygwin.
See: https://github.com/neovim/neovim/blob/e682d799fa3cf2e80a02d00c6ea874599d58f0e7/runtime/autoload/provider/clipboard.vim#L55-L121
  - pbcopy, pbpaste (macOS)
  - cygwin (Windows running Cygwin)
  - wl-copy, wl-paste (if $WAYLAND_DISPLAY is set)
  - xclip (if $DISPLAY is set)
  - xsel (if $DISPLAY is set)
  - lemonade (for SSH) https://github.com/pocke/lemonade
  - doitclient (for SSH) http://www.chiark.greenend.org.uk/~sgtatham/doit/
  - win32yank (Windows)
  - tmux (if $TMUX is set)

* clipboard: Fix tmux clipcopy after testing

Tmux must have special handling for /dev/stdin since it's managing the
terminal itself. This was tested with tmux-2.9a on macOS.

* clipboard: Fix bad expansion of exit-code test

Co-authored-by: Francisco de Zuviría <FranciscodeZuviria@fusap.com.ar>

Commands: make, tinderbox.

Closes #5195

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

This adds "jhsh" as an alias for "jhbuild shell" to the JHBuild plugin.

Closes #4807

Current state: a user invokes `ipython` and is provided with the IPython
instance regarding the `$PATH`.

Proposed state: a user invokes `ipython` (which is a new alias in the
*python plugin*) and is provided with the proper IPython instance regarding
the currently activated virtualenv.

Example: the user's default Python is 2.7 with installed IPython 2.7. User
activates Python 3.5 virtualenv where he installs IPython 3.5. After
activating the environment, one expects `ipython` to run the version 3.5,
which does not happen by default. Instead, IPython 2.7 is used, which in
counter-intuitive and often causes problem.

Closes #5797

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