support for switches in ini files

README.md

@@ -16,12 +16,24 @@ More information about INI files can be found on the [Wikipedia Page](http://en.
 
 ### Properties
 
-The basic element contained in an INI file is the property. Every property has
+A basic element contained in an INI file is the property. Every property has
 a name and a value, delimited by an equals sign *=*. The name appears to the
 left of the equals sign and the value to the right.
 
     name=value
 
+### Switches
+
+Switches are sometimes present in INI files to indicate whether a feature
+should be on or off.  Switches are made up by a single word on a line on its
+own.
+
+    name
+
+Switches are represented internally as an empty hash `{}` to avoid clashing
+with other values and are deactivated by removing the line from the file 
+completely.
+
 ### Sections
 
 Section declarations start with *[* and end with *]* as in `[section1]` and
@@ -49,6 +61,7 @@ A typical INI file might look like this:
     # another comment
     var1 = baz
     var2 = shoodle
+    a_switch
 
 
 Implementation

lib/inifile.rb

@@ -98,7 +98,13 @@ def write( opts = {} )
     File.open(filename, mode) do |f|
       @ini.each do |section,hash|
         f.puts "[#{section}]"
-        hash.each {|param,val| f.puts "#{param} #{@param} #{escape_value val}"}
+        hash.each {|param,val|
+          if val.class == Hash and val.empty?
+            f.puts param
+          else
+            f.puts "#{param} #{@param} #{escape_value val}"
+          end
+        }
         f.puts
       end
     end
@@ -428,6 +434,7 @@ def initialize( hash, param, comment, default )
       @section_regexp  = %r/\A\s*\[([^\]]+)\]#{comment}/
       @ignore_regexp   = %r/\A#{comment}/
       @property_regexp = %r/\A(.*?)(?<!\\)#{param}(.*)\z/
+      @switch_regexp   = %r/\A\s*(\w+)\s*#{comment}/
 
       @open_quote      = %r/\A\s*(".*)\z/
       @close_quote     = %r/\A(.*(?<!\\)")#{comment}/
@@ -528,12 +535,14 @@ def parse( content )
             error if property.empty?
 
             continuation = parse_value $2
+          when @switch_regexp
+            #self.property = $1.strip
+            self.section[$1.strip] = {}
           else
             error
           end
         end
       end
-
       # check here if we have a dangling value ... usually means we have an
       # unmatched open quote
       if leading_quote?

test/data/switch.ini

@@ -0,0 +1,3 @@
+[section_six]
+ switch_support
+

test/test_inifile.rb

@@ -557,5 +557,19 @@ def test_empty_comment_string
     assert_equal 3, ini_file['section_one']['one']
     assert_equal 5, ini_file['section_five']['five']
   end
+
+  def test_switch_support_read
+    ini_file = IniFile.load('test/data/switch.ini')
+
+    assert_equal({}, ini_file['section_six']['switch_support'])
+  end
+
+  def test_switch_support_write
+    ini_file = IniFile.new(:filename => "test/data/tmp.ini")
+    ini_file["foo"] = {"switch_support" => {}}
+    ini_file.save
+
+    assert File.read("test/data/tmp.ini") =~ /^switch_support$/
+  end
 end