add Float support

- in lib/
- in test/
- in README

3 files changed, 26 insertions, 0 deletions

diff --git a/README.md b/README.md
index a12491d..f5338dc 100644
--- a/README.md
+++ b/README.md
@@ -46,6 +46,7 @@ Built in Option types are as follows:
 o.string  #=> Slop::StringOption, expects an argument
 o.bool    #=> Slop::BoolOption, no argument, aliased to BooleanOption
 o.integer #=> Slop::IntegerOption, expects an argument, aliased to IntOption
+o.float   #=> Slop::FloatOption, expects an argument
 o.array   #=> Slop::ArrayOption, expects an argument
 o.null    #=> Slop::NullOption, no argument and ignored from `to_hash`
 o.on      #=> alias for o.null
diff --git a/lib/slop/types.rb b/lib/slop/types.rb
index c7db245..cc10e63 100644
--- a/lib/slop/types.rb
+++ b/lib/slop/types.rb
@@ -27,6 +27,13 @@ module Slop
   end
   IntOption = IntegerOption
 
+  class FloatOption < Option
+    def call(value)
+      # TODO: scientific notation, etc.
+      value =~ /\A\d*\.*\d+\z/ && value.to_f
+    end
+  end
+
   class ArrayOption < Option
     def call(value)
       @value ||= []
diff --git a/test/types_test.rb b/test/types_test.rb
index 3696126..e060df5 100644
--- a/test/types_test.rb
+++ b/test/types_test.rb
@@ -34,6 +34,24 @@ describe Slop::IntegerOption do
   end
 end
 
+describe Slop::FloatOption do
+  before do
+    @options = Slop::Options.new
+    @apr     = @options.float "--apr"
+    @apr_value = 2.9
+    @result  = @options.parse %W(--apr #{@apr_value})
+  end
+
+  it "returns the value as a float" do
+    assert_equal @apr_value, @result[:apr]
+  end
+
+  it "returns nil for non-numbers by default" do
+    @result.parser.reset.parse %w(--apr hello)
+    assert_equal nil, @result[:apr]
+  end
+end
+
 describe Slop::ArrayOption do
   before do
     @options = Slop::Options.new