Split some classes to formula_support

formula.rb is getting big, let's start splitting things out.

1 files changed, 95 insertions, 0 deletions

diff --git a/Library/Homebrew/formula_support.rb b/Library/Homebrew/formula_support.rb
new file mode 100644
index 000000000..6314f2951
--- /dev/null
+++ b/Library/Homebrew/formula_support.rb
@@ -0,0 +1,95 @@
+require 'download_strategy'
+
+
+# Defines a URL and download method for a stable or HEAD build
+class SoftwareSpecification
+  attr_reader :url, :specs, :using
+
+  VCS_SYMBOLS = {
+    :bzr     => BazaarDownloadStrategy,
+    :curl    => CurlDownloadStrategy,
+    :cvs     => CVSDownloadStrategy,
+    :git     => GitDownloadStrategy,
+    :hg      => MercurialDownloadStrategy,
+    :nounzip => NoUnzipCurlDownloadStrategy,
+    :post    => CurlPostDownloadStrategy,
+    :svn     => SubversionDownloadStrategy,
+  }
+
+  def initialize url, specs=nil
+    raise "No url provided" if url.nil?
+    @url = url
+    unless specs.nil?
+      # Get download strategy hint, if any
+      @using = specs.delete :using
+      # The rest of the specs are for source control
+      @specs = specs
+    end
+  end
+
+  # Returns a suitable DownloadStrategy class that can be
+  # used to retreive this software package.
+  def download_strategy
+    return detect_download_strategy(@url) if @using.nil?
+
+    # If a class is passed, assume it is a download strategy
+    return @using if @using.kind_of? Class
+
+    detected = VCS_SYMBOLS[@using]
+    raise "Unknown strategy #{@using} was requested." unless detected
+    return detected
+  end
+
+  def detect_version
+    Pathname.new(@url).version
+  end
+end
+
+
+# Used to annotate formulae that duplicate OS X provided software
+# or cause conflicts when linked in.
+class KegOnlyReason
+  attr_reader :reason, :explanation
+
+  def initialize reason, explanation=nil
+    @reason = reason
+    @explanation = explanation
+  end
+
+  def to_s
+    if @reason == :provided_by_osx
+      <<-EOS.strip
+Mac OS X already provides this program and installing another version in
+parallel can cause all kinds of trouble.
+
+#{@explanation}
+EOS
+    else
+      @reason.strip
+    end
+  end
+end
+
+
+# Used to annotate formulae that won't build correctly with LLVM.
+class FailsWithLLVM
+  attr_reader :msg, :data, :build
+
+  def initialize msg=nil, data=nil
+    if msg.nil? or msg.kind_of? Hash
+      @msg = "(No specific reason was given)"
+      data = msg
+    else
+      @msg = msg
+    end
+    @data = data
+    @build = data.delete :build rescue nil
+  end
+
+  def reason
+    s = @msg
+    s += "Tested with LLVM build #{@build}" unless @build == nil
+    s += "\n"
+    return s
+  end
+end