From 1c56cda4f1ab9ac1fcd6f2deb53f04f8b8455d81 Mon Sep 17 00:00:00 2001
From: Jack Nagel <jacknagel@gmail.com>
Date: Mon, 5 Nov 2012 20:03:26 -0600
Subject: [PATCH] Factor out MySQL and Postgres requirements

---
 Library/Homebrew/dependencies.rb |  4 +++
 Library/Homebrew/requirements.rb | 43 ++++++++++++++++++++++++++++++++
 2 files changed, 47 insertions(+)

diff --git a/Library/Homebrew/dependencies.rb b/Library/Homebrew/dependencies.rb
index 3526888399..e12cfb22ad 100644
--- a/Library/Homebrew/dependencies.rb
+++ b/Library/Homebrew/dependencies.rb
@@ -72,6 +72,10 @@ private
       X11Dependency.new(tag)
     when :xcode
       XcodeDependency.new(tag)
+    when :mysql
+      MysqlInstalled.new(tag)
+    when :postgresql
+      PostgresqlInstalled.new(tag)
     else
       raise "Unsupported special dependency #{spec}"
     end
diff --git a/Library/Homebrew/requirements.rb b/Library/Homebrew/requirements.rb
index 7f1a02da81..96c3b5cbd2 100644
--- a/Library/Homebrew/requirements.rb
+++ b/Library/Homebrew/requirements.rb
@@ -219,3 +219,46 @@ class XcodeDependency < Requirement
     EOS
   end
 end
+
+class MysqlInstalled < Requirement
+  def fatal?; true; end
+
+  def satisfied?
+    which 'mysql_config'
+  end
+
+  def message; <<-EOS.undent
+    MySQL is required to install.
+
+    You can install this with Homebrew using:
+      brew install mysql-connector-c
+        For MySQL client libraries only.
+
+      brew install mysql
+        For MySQL server.
+
+    Or you can use an official installer from:
+      http://dev.mysql.com/downloads/mysql/
+    EOS
+  end
+end
+
+class PostgresInstalled < Requirement
+  def fatal?; true; end
+
+  def satisfied?
+    which 'pg_config'
+  end
+
+  def message
+    <<-EOS.undent
+      Postgres is required to install.
+
+      You can install this with Homebrew using:
+        brew install postgres
+
+      Or you can use an official installer from:
+        http://www.postgresql.org/download/macosx/
+    EOS
+  end
+end