Closes Homebrew/homebrew#37590.

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

Closes Homebrew/homebrew#37217.

See the discussion in
https://github.com/Homebrew/homebrew-devel-only/pull/6



Closes Homebrew/homebrew#35793.

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

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>

People want to install things like GIMP using Homebrew so let's make it
easier for them to find a decent installation method.

Closes Homebrew/homebrew#34496.

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

CannotInstallFormulaError is only raised when another version of the
formula is linked or any of its dependencies are unlinked, in which case
this warning is totally irrelevant. It should be checked after build
errors instead.

This reverts commit 466d0f718bc2241e830393b384294c21194995e0.

install is the only command that can trigger this warning, so it should
be handled before instantiating the installer.

Closes Homebrew/homebrew#33648.

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

When installing or fetching and stuff goes wrong we can't always catch
the error and redirect to the tap. Instead, point to the tap before we
do anything failure-prone and hopefully that'll encourage people to
file issues in the right place. If not we can say that explicitly.

Closes Homebrew/homebrew#33220.

These are not caught anywhere, just raise the string. Missed in
1b3b61ff08a4ee5979838f7dbc171e9b38e83f7c.

Closes Homebrew/homebrew#29121.

If you do `brew install blah` it currently doesn't search for it. This
seems to be unintentional looking at this code as the exception thrown
by ARGV.formulae.each is not caught and handled. Instead, let's handle
this case and provide a little more usability around our taps.

Closes Homebrew/homebrew#31761.

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

Fixes Homebrew/homebrew#30084.
Closes Homebrew/homebrew#30203.

Closes Homebrew/homebrew#29593.

Closes Homebrew/homebrew#29380.

Closes Homebrew/homebrew#29206.

Closes Homebrew/homebrew#28717.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

Fixes Homebrew/homebrew#23928.

I'd still like to make this change, but at least for now the initializer
requires ignore_deps to be set correctly.

This reverts commit 881a8855b944fa9bd7dfd598bb9197f79f7a13f0.