require 'rubygems'
require 'rake'
require 'date'

#############################################################################
#
# The name of the package
#
#############################################################################

NAME = 'god'

#############################################################################
#
# Helper functions
#
#############################################################################

def source_version
  line = File.read("lib/#{NAME}.rb")[/^\s*VERSION\s*=\s*.*/]
  line.match(/.*VERSION\s*=\s*['"](.*)['"]/)[1]
end

def gemspec_file
  "#{NAME}.gemspec"
end

def gem_file
  "#{NAME}-#{source_version}.gem"
end

#############################################################################
#
# Standard tasks
#
#############################################################################

task :default => :test

require 'rake/testtask'
Rake::TestTask.new(:test) do |test|
  test.libs << 'lib' << 'test'
  test.pattern = 'test/**/test_*.rb'
  test.verbose = true
end

desc "Generate and open coverage stats via rcov"
task :coverage do
  require 'rcov'
  sh "rm -fr coverage"
  sh "rcov test/test_*.rb"
  sh "open coverage/index.html"
end

require 'rake/rdoctask'
Rake::RDocTask.new do |rdoc|
  rdoc.rdoc_dir = 'rdoc'
  rdoc.title = "#{NAME} #{source_version}"
  rdoc.rdoc_files.include('README*')
  rdoc.rdoc_files.include('lib/**/*.rb')
end

desc "Open an irb session preloaded with this library"
task :console do
  sh "irb -rubygems -r ./lib/#{NAME}.rb"
end

#############################################################################
#
# Custom tasks (add your own tasks here)
#
#############################################################################

desc "Upload site to Rubyforge"
task :site do
  sh "scp -r site/* mojombo@god.rubyforge.org:/var/www/gforge-projects/god"
end

desc "Upload site to Rubyforge"
task :site_edge do
  sh "scp -r site/* mojombo@god.rubyforge.org:/var/www/gforge-projects/god/edge"
end

#############################################################################
#
# Packaging tasks
#
#############################################################################

task :release => :build do
  unless `git branch` =~ /^\* master$/
    puts "You must be on the master branch to release!"
    exit!
  end
  sh "git commit --allow-empty -a -m 'up to #{source_version}'"
  sh "git tag v#{source_version}"
  sh "git push origin master --tags"
  sh "gem push pkg/#{NAME}-#{source_version}.gem"
end

task :build => :gemspec do
  sh "mkdir -p pkg"
  sh "gem build #{gemspec_file}"
  sh "mv #{gem_file} pkg"
end

task :gemspec => :validate do
  # read spec file and split out manifest section
  spec = File.read(gemspec_file)
  head, manifest, tail = spec.split("  # = MANIFEST =\n")

  # replace version and date
  head.sub!(/\.version = '.*'/, ".version = '#{source_version}'")
  head.sub!(/\.date = '.*'/, ".date = '#{Date.today.to_s}'")

  # determine file list from git ls-files
  files = `git ls-files`.
    split("\n").
    sort.
    reject { |file| file =~ /^\./ }.
    reject { |file| file =~ /^(examples|ideas|init|site)/ }.
    map { |file| "    #{file}" }.
    join("\n")

  # piece file back together and write
  manifest = "  s.files = %w[\n#{files}\n  ]\n"
  spec = [head, manifest, tail].join("  # = MANIFEST =\n")
  File.open(gemspec_file, 'w') { |io| io.write(spec) }
  puts "Updated #{gemspec_file}"
end

task :validate do
  libfiles = Dir['lib/*'] - ["lib/#{NAME}.rb", "lib/#{NAME}"]
  unless libfiles.empty?
    puts "Directory `lib` should only contain a `#{NAME}.rb` file and `#{NAME}` dir."
    exit!
  end
  unless Dir['VERSION*'].empty?
    puts "A `VERSION` file at root level violates Gem best practices."
    exit!
  end
end