require "formula"

class UniversalBrewedPython < Requirement
  satisfy { archs_for_command("python").universal? }

  def message; <<-EOS.undent
    A build of GDB using a brewed Python was requested, but Python is not
    a universal build.

    GDB requires Python to be built as a universal binary or it will fail
    if attempting to debug a 32-bit binary on a 64-bit host.
    EOS
  end
end

class Gdb < Formula
  homepage "http://www.gnu.org/software/gdb/"
  url "http://ftpmirror.gnu.org/gdb/gdb-7.7.1.tar.gz"
  mirror "http://ftp.gnu.org/gnu/gdb/gdb-7.7.1.tar.gz"
  sha1 "bb49bdb5781ea62ccdc2ec6869872e1b43168572"

  depends_on "readline"

  if build.with? "brewed-python"
    depends_on UniversalBrewedPython
  end

  option "with-brewed-python", "Use the Homebrew version of Python"
  option "with-version-suffix", "Add a version suffix to program"

  def install
    args = [
      "--prefix=#{prefix}",
      "--disable-debug",
      "--disable-dependency-tracking",
      "--with-system-readline"
    ]

    if build.with? "brewed-python"
      args << "--with-python=#{HOMEBREW_PREFIX}"
    else
      args << "--with-python=/usr"
    end

    if build.with? "version-suffix"
      args << "--program-suffix=-#{version.to_s.slice(/^\d/)}"
    end

    system "./configure", *args
    system "make"
    system "make", "install"

    # Remove conflicting items with binutils
    rm_rf include
    rm_rf lib
    rm_rf share/"locale"

    # Conflicts with other GNU packages
    rm_f info/"standards.info"
  end

  def caveats; <<-EOS.undent
    gdb requires special privileges to access Mach ports.
    You will need to codesign the binary. For instructions, see:

      http://sourceware.org/gdb/wiki/BuildingOnDarwin
    EOS
  end
end