Allow to suppress automatic creation of --no-boolean flags

Author: xjunior

lib/thor/parser/option.rb

@@ -13,6 +13,7 @@ def initialize(name, options = {})
       @group          = options[:group].to_s.capitalize if options[:group]
       @aliases        = Array(options[:aliases])
       @hide           = options[:hide]
+      @inverse        = options[:inverse]
     end
 
     # This parse quick options given as method_options. It makes several
@@ -88,10 +89,7 @@ def usage(padding = 0)
       end
 
       sample = "[#{sample}]".dup unless required?
-
-      if boolean?
-        sample << ", [#{dasherize('no-' + human_name)}]" unless (name == "force") || name.start_with?("no-")
-      end
+      sample << ", [#{dasherize('no-' + human_name)}]" if inverse?
 
       if aliases.empty?
         (" " * padding) << sample
@@ -100,6 +98,11 @@ def usage(padding = 0)
       end
     end
 
+    def inverse?
+      return false if (name == "force") || name.start_with?("no-")
+      boolean? && @inverse.nil? || @inverse.eql?(true)
+    end
+
     VALID_TYPES.each do |type|
       class_eval <<-RUBY, __FILE__, __LINE__ + 1
         def #{type}?

spec/parser/option_spec.rb

@@ -119,6 +119,18 @@ def option(name, options = {})
     expect(option("--foo").switch_name).to eq("--foo")
   end
 
+  it "suppresses the creation of a --no-option when explicitly requested" do
+    expect(option("bar", type: :boolean, :inverse => false).usage).to_not include("[--no-bar]")
+  end
+
+  it "creates the inversion flag by default" do
+    expect(option("bar", type: :boolean).usage).to include("[--no-bar]")
+  end
+
+  it "creates the inversion flag when requested" do
+    expect(option("bar", type: :boolean, :inverse => true).usage).to include("[--no-bar]")
+  end
+
   it "returns the human name" do
     expect(option("foo").human_name).to eq("foo")
     expect(option("--foo").human_name).to eq("foo")