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

Fixes Homebrew/homebrew#13535.

Rather than skip unlinking if there's no linked keg record, check to
see whether the destination's realpath is the same as the source file
in the keg being unlinked.

This caused weird issues in the case that multiple formulae provide
the same file.

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

Closes Homebrew/homebrew#13495.

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

Also updates the bash-completion to ignore subdirectories, rather than
specific filename patterns.

Hides files with the extensions ".css" and ".erb" to ensure that the
brew-bot's support files don't show up in tab-completion.

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

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

Since 3ee9b7bd88a2d9017cdf005b10567a1d6d8ec211 ("SoftwareSpec:
initialize @mirrors"), @active_spec.mirrors will always be non-nil.

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

Fixes Homebrew/homebrew#13434.

Eventually I will stop making this mistake.

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

Commit 3b5d7939d9a660a83e29a86e6bab234f3e9f2dcb added completion for
`brew link` options, but disabled completion of the actual command
itself.

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

The last make_relative_symlink was missing the mode argument, which
caused spurious linking under certain circumstances.

The symbol versions of :autoconf, :automake and :libtool only activate
for OS X / Xcode combinations that do not provide autotools.

Some programs fail where they would otherwise succeed if stdout or stderr is
closed. For example, using mpicc from the mpich2 formula:

    quiet_system 'mpicc', '--version'

Fails with:

    LLVM ERROR: IO failure on output stream.

While

    system 'mpicc', '--version'

Succeeds.

Closes Homebrew/homebrew#13253.

Signed-off-by: Charlie Sharpsteen <source@sharpsteen.net>

Add an ARGV.dry_run? helper method for '--dry-run'/'-n' now that
'-n' is being used as a git-style dry-run in two commands.

Closes Homebrew/homebrew#12898.

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

`brew link` can now be made to delete any conflicting files using
the --force argument. It also has a --dry-run option, similar to
git clean -n, which will list any files which would be deleted
without touching the filesystem.

Closes Homebrew/homebrew#11811.

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

SDK/usr/include and lib now appended instead of prepended.
Prepending overwrote our precedence of HOMEBREW_PREFIX/include and lib.

Closes Homebrew/homebrew#13292.

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

Closes Homebrew/homebrew#11091.

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

But only display them if they are out of sync with the corresponding
Xcode version.

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

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

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

When the first error pipe object is finalized, the underlying file
descriptor is closed, breaking the pipe between the build script and the
main Homebrew process. Keep a reference to this object so it isn't
closed.

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

This command was undocumented, only for autotools, and it is enough to do
`brew install foo -i` and then `./configure --help` in two steps.

* 4.3.3 is the latest on 10.7
* Give up if we don't know what the latest is (10.8 and beyond)

In 1.8, Pathname.find would work (and do nothing) if the
source path didn't exist. In 1.9 this throws an exception
instead, so check whether the file exists before trying.