Because `gem instal` works too.

More robust code than before, and replaces all usage of `xcode-select -print-path`.

Rationale: this is more useful than the union, and you can still easily get the union by running the command twice and concatenating the result.

We currently only fix relative paths, but we should expand this more.

Yields after chmoding (if necessary), once block is complete restores permissions.

Also don't abort searches if the query matches a blacklist. Eg.
`brew search vim` should return macvim and the information that vim itself is
not packaged.

The code was sucking. To the extent that maintenance was hard. It's a lot
easier to work with code that is sensibly split at sensible boundaries. So
now it is more like that.

But the refactor is minimal. Because we don't want you to have more merge
hell than absolutely necessary.

If you merge you will need to pay attention to brew.h.rb (as it is deleted)
and bin/brew (as command logic is gone). It will be painful, but you will just
have to help git out by moving any changes around manually.

Note compatibility.rb. It ensures that any function renames or removals don't
break anything. We're pretty serious about backwards compatibility. And that's
because we encourage you to hack around with the innards. And we couldn't do
that if we would then just make stuff disappear behind your back.

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

Closes Homebrew/homebrew#4217.

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

Accept any options that `brew deps` accepts.
Default to `--all` to preserve previous behaviour.

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

1. Fix a misspelled variable to avoid shell namespace pollution
2. Remove a bogus completion (the 'brew xo' one)
3. Add missing tab completion code for
   - Several arguments/commands (options, --cellar etc.)
   - Aliases (e.g. home and homepage)
   - 'brew edit' complete to all formulae, not just installed ones

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

Signed-off-by: Max Howell <max@methylblue.com>

i.e. `--force --debug --use-llvm --ignore-dependencies --HEAD`

Additionally:

 * Use a cleaner `if` block in install options completion case.
 * De-dupe options for subsequent completion (e.g. stop offering --foo once
   --foo option has been used).

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

To trigger the option autocompletion, type:

    brew install foo --[tab][tab]

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

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

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

We shouldn't ever really have these but better to be safe than sorry.