* without `default_remote`, `CoreTap#install` won't be able to tell
  whether user has passed to custom remote to it.
* simplify some part of logics

* remote check requires `git` installed.
* Do not perform check if user does not passing remote explicitly.

Fixes #108

This reverts commit 2caf7b76.

Library/Homebrew/dev-cmd/linkage.rb:113: warning: shadowing outer local variable - label

Library/Homebrew/cmd/man.rb:44: warning: assigned but unused variable - commands

Noted, `brew tap foo` will not fail if the tap is already installed.

This is to avoid TapFormulaAmbiguityError.
We should load formula based on what we installed,
rather than just name.

Pulls 'brew linkage' in to main brew repo as a dev-cmd, and has test-bot
use it to detect dylib breakage, which usually means a revision bump is
needed. Checks all dependents, not just those with a 'test do' block
defined, since we can do this without formula support.

Closes #107.

Signed-off-by: Andrew Janke <andrew@apjanke.net>

Fixes mistydemeo/tigerbrew#186.

Closes #110.

Signed-off-by: Misty De Meo <mistydemeo@github.com>

https://github.com/Homebrew/brew/commit/e70a3552d3faddd0afd2535a03c31b8c50be901a seems to have
exacerbated the problem where taps stick around and then `brew uses` gets executed
on a whole host of taps, which is currently breaking almost every PR for formulae
that would be used cross-tap, as well as causing lengthier CI builds.

Examples from the last week or so include sqlite, V8, protobuf, and so on. Whilst it
may be true that cross-tap formulae failing can show problems that need looking at,
a lot of the time the failures are unrelated to the build in question and just
leave contributors confused on what needs to be done, or why their PR is failing
for something that seems entirely unrelated.

You can see the taps failing to vanish locally by doing something like:

```
brew tap homebrew/fuse
brew tap homebrew/versions
cd $(brew --prefix) && git clean -ffdx --exclude=/Library/Taps/
brew tap
...
homebrew/core
homebrew/fuse
homebrew/versions
```

This is a very simple proposal to handle the problem, but there's no real reason
I couldn't write this functionality into untap itself and then we call that in
test-bot. Just didn't necessarily want to jump immediately to expanding the untap
command to solve what is more-or-less a CI problem.

Also enables sandbox for --interactive and --debug use of install
and test, using automatic retention.

Closes #66.

Signed-off-by: Andrew Janke <andrew@apjanke.net>

This is a nicer error message than the `exec` failing at a later stage.

Showing help makes sense for `brew help <command>`, but showing it for
`brew <command> help` is undesirable and prevents all commands from
accepting a named argument `help` (formula, tap, file name, etc.).

All other help flags are still detected before *and* after the command.

Closes #103.

Signed-off-by: Martin Afanasjew <martin@afanasjew.de>

Also remove related helper method `Homebrew.help_s`.

Keep the footprint of `brew.rb` small. Handle fetching/displaying an
appropriate help text (taking into account various external conditions)
in the `help` command.

Closes #101.

Signed-off-by: Martin Afanasjew <martin@afanasjew.de>

Don't search for alternatives if formula was found, but has issues, as
this will create confusing output, particularly for contributors working
on a formula file.

Present a more helpful error message if a formula file was loaded, but
the class(es) therein didn't match the expected formula class name.

Closes #102.

Signed-off-by: Martin Afanasjew <martin@afanasjew.de>

Changes to the man page are made in `header.1.md`, `footer.1.md`, or the
documentation comment block in the respective command file. Remove old
Markdown file to reduce confusion, now that it is no longer needed (and
not even used by `brew man`).

Split monolithic method into more manageable chunks and fix code style.

Since edf000e4 `zsh` completions are in
`share/zsh/site-functions/_brew`, making this path a part of Homebrew.
Hide it from `brew list --unbrewed` to reduce confusion/noise.

Fixes #70.

Signed-off-by: Baptiste Fontaine <batifon@yahoo.fr>

Currently, brew audit --strict includes the name of the tap when calculating the
length of a formula's description. This makes it difficult to pass the audit for
formulas in taps with lengthy names. In #47033 @jawshooah called out head-only
or devel-only taps specifically, but this is an issue elsewhere. For example:

homebrew/versions/elasticsearch20: Distributed search & analytics engine (72)

This commit updates audit.rb to use formula.name rather than formula.full_name.

Closes #47033 -- Audit shouldn't include tap name in description length

Closes #92.

Signed-off-by: Xu Cheng <xucheng@me.com>

Also add options to include optional/build deps and an option
to skip recommended deps.

Closes Homebrew/legacy-homebrew#50066.

By the commit edf000e4, bash and zsh
completion scripts have been moved to `etc/bash_completion.d/brew` and
`share/zsh/site-functions/_brew`, respectively. Now completion will be
done automatically without any trick.

(#85)

Old logic doesn't include revision. This fixes that, and passes the
whole formula prefix path to avoid duplicating the path-construction
logic.

Closes #80.

Signed-off-by: Andrew Janke <andrew@apjanke.net>