db driver registration

spec/std/db/driver_spec.cr

@@ -0,0 +1,19 @@
+require "spec"
+require "db"
+
+class DummyDriver < DB::Driver
+end
+
+DB.register_driver "dummy", DummyDriver
+
+describe DB::Driver do
+  it "should get driver class by name" do
+    DB.driver_class("dummy").should eq(DummyDriver)
+  end
+
+  it "should instantiate driver with options" do
+    driver = DB.driver "dummy", {"host": "localhost", "port": "1027"}
+    driver.options["host"].should eq("localhost")
+    driver.options["port"].should eq("1027")
+  end
+end

src/db/db.cr

@@ -0,0 +1,16 @@
+module DB
+  def self.driver_class(name) # : Driver.class
+    @@drivers.not_nil![name]
+  end
+
+  def self.register_driver(name, klass : Driver.class)
+    @@drivers ||= {} of String => Driver.class
+    @@drivers.not_nil![name] = klass
+  end
+
+  def self.driver(name, options)
+    driver_class(name).new(options)
+  end
+end
+
+require "./driver"

src/db/driver.cr

@@ -0,0 +1,8 @@
+module DB
+  abstract class Driver
+    getter options
+
+    def initialize(@options)
+    end
+  end
+end