Pull back the changelog generation to the simplest thing that can possibly work

Rakefile

@@ -51,127 +51,10 @@ end
 desc "Remove all build targets, binaries and temporary files"
 maketask :clean
 
-# If you've made a commit, the changelog needs redoing
-file "debian/changelog" => ".hg/last-message.txt" do
-  latesttag_cmd = "hg log -l1 --template '{latesttag}'"
-  latesttag = `#{latesttag_cmd}`.strip
-  log_cmd = "hg log --style xml"
-  projname = "flexnbd"
-
-  File.open("debian/changelog", "w") do |changelog|
-    IO.popen( log_cmd, "r" ) do |io|
-      listener = HGChangelog::Listener.new changelog, projname, latesttag
-      REXML::Document.parse_stream io, listener
-      io.close
-    end
-  end
+file "debian/changelog" do
+  FileUtils.mkdir_p "debian"
+  sh "hg log --style=changelog.template > debian/changelog"
 end
+
+desc "Generate the changelog"
 task :changelog => "debian/changelog"
-
-BEGIN {
-  require 'rexml/document'
-  require 'date'
-  require 'erb'
-
-  module HGChangelog
-    class ChangelogEntry
-      attr_accessor :email
-      attr_accessor :author_name
-      attr_accessor :date
-      def initialize(projname, tag, rev)
-        @projname = projname
-        @tag = tag
-        @rev = rev
-        @lines = []
-      end
-
-      def close( stream )
-        stream.write self.to_s
-      end
-
-      def <<( msg )
-        @lines << msg
-      end
-
-      def to_s
-        if @lines.empty?
-          ""
-        else
-          template = <<-TEMPLATE
-<%= @projname %> (<%= @tag %>-<%= @rev %>) stable; urgency=low
-
-<% for  line in @lines -%>
-  * <%= line.split("\n").first.strip %>
-<% end  -%>
-
- -- <%= @author_name %> <<%= @email %>>  <%= render_date %>
-
-          TEMPLATE
-
-          ERB.new(template, nil, "-").result(binding)
-        end
-      end
-
-      def render_date
-        DateTime.parse(@date).rfc2822
-      end
-
-    end # class ChangelogEntry
-
-
-    class Listener
-      def initialize out, projname, start_tag
-        @out = out
-        @projname = projname
-        @start_tag = start_tag
-      end
-
-      def method_missing(sym,*args,&blk)
-      end
-
-      def tag_start( name, attrs )
-        case name
-        when "logentry"
-          @rev = attrs['revision']
-          if !@entry # first time; collect stuffs for everything since last tag
-            @entry = ChangelogEntry.new @projname, @start_tag, @rev
-          end
-        when "author"
-          @email = attrs['email']
-        when "tag"
-          @entry.close @out if @entry
-          @tagged = true
-        end
-      end
-
-      def tag_end( name )
-        case name
-        when "logentry"
-          if @tagged
-            @entry.email = @email
-            @entry.author_name = @author_name
-            @entry.date = @date
-          end
-          @entry << @message if @message !~ /Added tag.*for changeset/
-                                                          @tagged = false
-          when "author"
-            @author_name = @text
-          when "tag"
-            if @text != "tip" # again, we want to skip the first one
-              @entry = ChangelogEntry.new @projname, @text, @rev
-            end
-          when "msg"
-            @message = @text
-          when "date"
-            @date = @text
-          when "log"
-            @entry.close @out
-          end
-        end
-
-        def text( text )
-          @text = text
-        end
-      end # class Listener
-    end # module HGChangelog
-}