1 files changed, 99 insertions, 0 deletions
diff --git a/Library/Homebrew/exceptions.rb b/Library/Homebrew/exceptions.rb
new file mode 100644
index 000000000..73cda01e5
--- /dev/null
+++ b/Library/Homebrew/exceptions.rb
@@ -0,0 +1,99 @@
+
+class NotAKegError < RuntimeError
+end
+
+class FormulaUnavailableError < RuntimeError
+  attr :name
+  def initialize name
+    @name = name
+    super "No available formula for #{name}"
+  end
+end
+
+module Homebrew
+  class InstallationError < RuntimeError
+    attr :formula
+    def initialize formula
+      @formula = formula
+    end
+    def initialize formula, message
+      super message
+      @formula = formula
+    end
+  end
+end
+
+class FormulaAlreadyInstalledError < Homebrew::InstallationError
+  def message
+    "Formula already installed: #{formula}"
+  end
+end
+
+class FormulaInstallationAlreadyAttemptedError < Homebrew::InstallationError
+  def message
+    "Formula installation already attempted: #{formula}"
+  end
+end
+
+class UnsatisfiedExternalDependencyError < Homebrew::InstallationError
+  attr :type
+  
+  def initialize formula, type
+    @type = type
+    @formula = formula
+  end
+
+  def message
+    <<-EOS.undent
+      Unsatisfied dependency: #{formula}
+      Homebrew does not provide #{type.to_s.capitalize} dependencies, #{tool} does:
+
+          #{command_line} #{formula}
+      EOS
+  end
+
+  private
+
+  def tool
+    case type
+      when :python then 'pip'
+      when :ruby, :jruby then 'rubygems'
+      when :perl then 'cpan'
+    end
+  end
+
+  def command_line
+    case type
+      when :python
+        "#{brew_pip}pip install"
+      when :ruby
+        "gem install"
+      when :perl
+        "cpan -i"
+      when :jruby
+        "jruby -S gem install"
+    end
+  end
+
+  def brew_pip
+    'brew install pip && ' unless Formula.factory('pip').installed?
+  end
+end
+
+class BuildError < Homebrew::InstallationError
+  attr :exit_status
+  attr :command
+  attr :env
+
+  def initialize formula, cmd, args, es
+    @command = cmd
+    @env = ENV.to_hash
+    @exit_status = es.exitstatus rescue 1
+    args = args.map{ |arg| arg.gsub " ", "\\ " }.join(" ")
+    super formula, "Failed executing: #{command} #{args}"
+  end
+
+  def was_running_configure?
+    @command == './configure'
+  end
+end