Consequence: you can no longer install when something is already installed, you must upgrade it. This doesn't apply if the formula in question was unlinked. You can still --force installs though.

Rationale: the old way of installing over the top would leave symlinks to multiple versions in /usr/local if the old version had a file the newer version didn't. The new upgrade command handles everything properly.

HOMEBREW_PREFIX for example.

It just means nobody knows what is being done without scrolling up and down, up and down the file like a doofus on a pogo stick.

Finder activity such as moving the position of an icon can create an unexpected
.DS_Store file in a Cellar directory. This causes `brew remove --force` to throw
an error that is reported as

Error: Directory not empty - /usr/local/Cellar/<formula>

This fix avoids that error, by calling rmtree rather than rmdir.

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

For now we don't support this kind of thing because our formula is a worse option, even though you have to update it yourself.

Closes Homebrew/homebrew#6174

Selection of generic installation options, such as `--HEAD`, is now lumped
together with selection of formulae-specific options.

This allows any installation option to be tab-completed *before or after* the
formula name is specified.

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

Note this only happens if Homebrew is *not* installed sudo. Which is most of the time true.

Fixes Homebrew/homebrew#6899

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

We don't know what revision the tarball was when homebrew was installed, so all we can do really is hard reset. In theory some set of git commands should suffice, but apparently --soft and --mixed resets ended up putting stuff in the index which would break subsequent `brew updates`.

Fixes Homebrew/homebrew#6851

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

Users were seeing local changes in their repository after updating, even
though they had made no local changes.

The repository setup sequence should use `git reset --soft` rather than
vanilla `git reset`, which defaults to '--mixed'. '--soft' updates
_only_ HEAD, leaving the index as-is, allowing future incantations of
`brew update` to proceed without errors.

Fixes Homebrew/homebrew#6732.

The output happens as it is determined, rather than all at once, which is preferable for CLI commands. This meant I had to hard-code the left-justification.

The pre-amble warning is removed. Instead the command outputs the git checkout command for each she that you can type to get that old formula.

I decided that reseting the one file will work 99% of the time and that it is too risky to reset the whole repo, this will roll-back bug fixes. Instead we should add functionality to compat/ in order to support old formula as required. Sometimes deps may have to be rolled-back too, but the user will have to figure this out on an ad-hoc basis. We are assuming a failure sophisticated user anyway, one who would like to get old versions of stuff.

I moved most of the functions into Formula since IMO this makes more conceptual sense.

I made the she get abbreviated by git (using --abbrev-commit) itself so it as short as can be.

Allow compatibility to be disabled with --no-compat or HOMEBREW_NO_COMPAT environment variable.

Dumb mistake. Sorry.

Closes Homebrew/homebrew#6722

Since this is our new policy for /usr/local.

Rationale: people break their installs by mixing sudo and non-sudo usage. They are used to having to `sudo port install` and shit like that, so I understand why the mixing happens.

Longer-term we'll try and use install_name_tool to fix Lion
bottles so they run fine on 10.5 and/or 10.6.

Closes Homebrew/homebrew#6699.

Qt and PhantomJS install apps to this folder, so find those apps too.

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