Minor tweaks to handling of removing settings

This commit makes some minor changes to how we handle removing
settings.  In particular, it updates all of the line numbers
of the various 'section' objects to correspond to the new
state of the world based on the removal of a line that appeared
before them.

Also adds one more test related to setting removal.

lib/puppet/util/ini_file.rb

@@ -45,8 +45,19 @@ module Util
     def remove_setting(section_name, setting)
       section = @sections_hash[section_name]
       if (section.has_existing_setting?(setting))
+        # If the setting is found, we have some work to do.
+        # First, we remove the line from our array of lines:
         remove_line(section, setting)
+
+        # Then, we need to tell the setting object to remove
+        # the setting from its state:
         section.remove_existing_setting(setting)
+
+        # Finally, we need to update all of the start/end line
+        # numbers for all of the sections *after* the one that
+        # was modified.
+        section_index = @section_names.index(section_name)
+        decrement_section_line_numbers(section_index + 1)
       end
     end
 
@@ -61,9 +72,7 @@ module Util
             fh.puts("\n[#{section.name}]")
           elsif ! section.end_line.nil?
             (section.start_line..section.end_line).each do |line_num|
-              if lines[line_num]
-                fh.puts(lines[line_num])
-              end
+              fh.puts(lines[line_num])
             end
           end
 
@@ -153,6 +162,17 @@ module Util
         File.readlines(path)
     end
 
+
+    # Utility method; given a section index (index into the @section_names
+    # array), decrement the start/end line numbers for that section and all
+    # all of the other sections that appear *after* the specified section.
+    def decrement_section_line_numbers(section_index)
+      @section_names[section_index..(@section_names.length - 1)].each do |name|
+        section = @sections_hash[name]
+        section.decrement_line_nums
+      end
+    end
+
   end
 end
 end

lib/puppet/util/ini_file/section.rb

@@ -25,13 +25,29 @@ class IniFile
     end
 
     def remove_existing_setting(setting_name)
-      @existing_settings.delete(setting_name)
+      if (@existing_settings.delete(setting_name))
+        if @end_line
+          @end_line = @end_line - 1
+        end
+      end
     end
 
     def set_additional_setting(setting_name, value)
       @additional_settings[setting_name] = value
     end
 
+    # Decrement the start and end line numbers for the section (if they are
+    # defined); this is intended to be called when a setting is removed
+    # from a section that comes before this section in the ini file.
+    def decrement_line_nums()
+      if @start_line
+        @start_line = @start_line - 1
+      end
+      if @end_line
+        @end_line = @end_line - 1
+      end
+    end
+
   end
 end
 end

spec/unit/puppet/provider/ini_setting/ruby_spec.rb

@@ -505,6 +505,32 @@ subby=bar
 EOS
     )
     end
+
+    it "should do nothing for a setting that does not exist" do
+      resource = Puppet::Type::Ini_setting.new(common_params.merge(
+                                                   :section => 'section:sub', :setting => 'foo', :ensure => 'absent'))
+      provider = described_class.new(resource)
+      provider.exists?.should be_nil
+      provider.destroy
+      validate_file(<<-EOS
+[section1]
+; This is also a comment
+foo=foovalue
+
+bar = barvalue
+master = true
+[section2]
+
+foo= foovalue2
+baz=bazvalue
+url = http://192.168.1.1:8080
+[section:sub]
+subby=bar
+    #another comment
+ ; yet another comment
+      EOS
+      )
+    end
   end
 
 end