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###	S U B V E R S I O N   T A S K S   A N D   H E L P E R S

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require 'rake/tasklib'

#

# Work around the inexplicable behaviour of the original RDoc::VerifyTask, which 

# errors if your coverage isn't *exactly* the threshold.

# 

# A task that can verify that the RCov coverage doesn't

# drop below a certain threshold. It should be run after

# running Spec::Rake::SpecTask.

class VerifyTask < Rake::TaskLib

	COVERAGE_PERCENTAGE_PATTERN = 

		%r{<tt class='coverage_code'>(\d+\.\d+)%</tt>}

	# Name of the task. Defaults to :verify_rcov

	attr_accessor :name

	# Path to the index.html file generated by RCov, which

	# is the file containing the total coverage.

	# Defaults to 'coverage/index.html'

	attr_accessor :index_html

	# Whether or not to output details. Defaults to true.

	attr_accessor :verbose

	# The threshold value (in percent) for coverage. If the 

	# actual coverage is not equal to this value, the task will raise an 

	# exception. 

	attr_accessor :threshold

	def initialize( name=:verify )

		@name = name

		@index_html = 'coverage/index.html'

		@verbose = true

		yield self if block_given?

		raise "Threshold must be set" if @threshold.nil?

		define

	end

	def define

		desc "Verify that rcov coverage is at least #{threshold}%"

		task @name do

			total_coverage = nil

			if match = File.read( index_html ).match( COVERAGE_PERCENTAGE_PATTERN )

				total_coverage = Float( match[1] )

			else

				raise "Couldn't find the coverage percentage in #{index_html}"

			end

			puts "Coverage: #{total_coverage}% (threshold: #{threshold}%)" if verbose

			if total_coverage < threshold

				raise "Coverage must be at least #{threshold}% but was #{total_coverage}%"

			end

		end

	end

end

# vim: set nosta noet ts=4 sw=4: