@sceaga has discontinued his homebrew fork, so tigerbrew is now PPC/
Tiger users' best bet.

At your option: `brew --config -1`.

Shows full backtrace, which is useful. Now blank "raise" statements are the equivalent of admitting programmer error. The backtrace will be useful.

Because people use this in .bash_profile etc. We should be as fast as possible.

Let's not show weird error messages when user interrupts during various stages of brew initialization.

Tested by doing `for x in $(brew search); do brew install $x; done` and pressing CTRL-C at random short intervals.

Fixes a case where brew would find commands with wrongly-capitalized
user input on case-insensitive systems, then error out with a confusing
message when an invalid method was sent to Homebrew. e.g.:

> brew Update
Error: undefined method `Update' for Homebrew:Module

We don't want bug reports about this crap, even though the user REALLY should listen to the warning message. What actually happens is they blame us instead.

This kind of warning in particular:

warning: Insecure world writable dir /usr/local/bin in PATH

Rationale: some users insist on replacing the /usr/bin/ruby symlink
to point to another ruby on their system, which may break homebrew.
Use the full Framework path instead, which is less likely to be tampered with.

This also reorganizes the brew --config checks to reflect the different path.

Fixes Homebrew/homebrew#12009.

Closes Homebrew/homebrew#12333.

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

'which' only returns a Pathname or nil, and doesn't care about anything
sent to stderr, so just silence it by default and combine the two
methods.

Closes Homebrew/homebrew#12115.

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