Closes Homebrew/homebrew#35556.

Just equalises a little how we treat HEAD and devel. The former already
fails if there isn’t a head defined, It seemed logical that devel
should fail in the same way.

Closes Homebrew/homebrew#35554.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

The public readers for these attributes are on the instance, not the
class.

Fixes Homebrew/homebrew#35523.

Closes Homebrew/homebrew#35465.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Closes Homebrew/homebrew#35531.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

These files do not contain any non-ASCII characters.

Closes Homebrew/homebrew#35529.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

The --help flag is intercepted by brew.rb and prints the global usage
string. `irb` is never called when `brew irb --help` is executed.

Closes Homebrew/homebrew#35466.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Closes Homebrew/homebrew#35456.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

* Moved the `pip` homepage to something that points more directly at
`pip`.
* Adds a note on `test do`. All the maintainers and the bot check the
existence of such things these days, but I guess if anyone stumbles
across the document it’s useful to say.
* GiX is formally dead, and has two blessed forks.
* Typo on contributor.

Closes Homebrew/homebrew#35467.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

If the `Gem.user_dir/bin` is not already in the PATH it'll complain
unnecessarily (as we add it to the PATH ourselves) so just add it to the
PATH before running the install.

This uses the logic from tests.rb in man.rb too so that this can be
shared in a few places.

Closes Homebrew/homebrew#35459.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Closes Homebrew/homebrew#35424.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

It's that most glorious time of the year: When everyone on Github
bumps their license dates to cover yet another year ahead.

Closes Homebrew/homebrew#35433.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Closes Homebrew/homebrew#35427.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Formulary.loader_for cannot raise exceptions, as canonical_name must
work for nonexistent formulae. However, we can skip the constant lookup
and a redundant file existence check by returning a loader that raises
immediately in #get_formula.