First cut of unit test

.gitignore

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+*.gem
+*.rbc
+.bundle
+.config
+.yardoc
+Gemfile.lock
+InstalledFiles
+_yardoc
+coverage
+doc/
+lib/bundler/man
+pkg
+rdoc
+spec/reports
+test/tmp
+test/version_tmp
+tmp

Gemfile

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+source 'https://rubygems.org'
+
+# Specify your gem's dependencies in twdeps.gemspec
+gemspec

LICENSE

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+Copyright (c) 2012 Nicholas E. Rabenau
+
+MIT License
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+# TaskWarrior Dependency Visualization
+
+Visualizes dependencies between TaskWarrior tasks.
+
+## Installation
+
+    $ gem install twdeps
+
+## Usage
+
+  # Create a dependency graph as PNG and pipe it to a file
+  task export rc.json.array=on rc.verbose=nothing | twdeps > deps.png
+
+  # Same but override format. Use the file option to specify the file name to write to
+  task export rc.json.array=on rc.verbose=nothing | twdeps --format svg --file deps.svg
+
+  # Create a graph from a previously exported file
+  cat tasks.json | twdeps > deps.png
+
+## Limitations
+
+TaskWarrior 2.0 needs the command line options `rc.json.array=on` and `rc.verbose=nothing` due to [two](http://taskwarrior.org/issues/1017) [bugs](http://taskwarrior.org/issues/1013) in JSON export.
+
+## Contributing
+
+1. Fork it
+2. Create your feature branch (`git checkout -b my-new-feature`)
+3. Commit your changes (`git commit -am 'Added some feature'`)
+4. Push to the branch (`git push origin my-new-feature`)
+5. Create new Pull Request

Rakefile

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+#!/usr/bin/env rake
+require "bundler/gem_tasks"
+require 'rake/testtask'
+
+Rake::TestTask.new(:test) do |test|
+  test.libs << 'lib' << 'test' << 'test/helpers'
+  test.test_files = FileList['test/**/test_*.rb']
+end
+
+task :default => :test

bin/twdeps

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+#!/usr/bin/env ruby
+
+require 'bundler'
+Bundler.require
+
+# require output file argument if $stdout.tty?, otherwise it's being piped
+outfile = "#{ARGV.shift}.png"
+
+g = GraphViz::new("G")
+
+main        = g.add_nodes("main")
+parse       = g.add_nodes("parse")
+execute     = g.add_nodes("execute")
+init        = g.add_nodes("init")
+cleanup     = g.add_nodes("cleanup")
+make_string = g.add_nodes("make_string")
+printf      = g.add_nodes("printf")
+compare     = g.add_nodes("compare")
+
+g.add_edges( main, parse )
+g.add_edges( parse, execute )
+g.add_edges( main, init )
+g.add_edges( main, cleanup )
+g.add_edges( execute, make_string )
+g.add_edges( execute, printf )
+g.add_edges( init, make_string )
+g.add_edges( main, printf )
+g.add_edges( execute, compare )
+
+g.output(:png => outfile)

lib/twdeps.rb

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+require "twdeps/version"
+
+require "graphviz"
+
+module TaskWarrior
+  module Dependencies
+    # Your code goes here...
+  end
+end

lib/twdeps/version.rb

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+module TaskWarrior
+  module Dependencies
+    VERSION = "0.0.1"
+  end
+end

test/fixtures/no_deps.json

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+[{"id":1,"description":"Select a free weekend in November","entry":"20120629T191421Z","priority":"H","project":"party","status":"pending","uuid":"6fd0ba4a-ab67-49cd-ac69-64aa999aff8a","annotations":[{"entry":"20120629T191534Z","description":"the 13th looks good"}]},
+{"id":2,"description":"Select and book a venue","entry":"20120629T191634Z","priority":"H","project":"party","status":"pending","uuid":"c992448a-f1ea-4982-8461-47f0705ff509"},
+{"id":3,"description":"Mail invitations","entry":"20120629T191919Z","project":"party","status":"pending","uuid":"3b53178e-d5a4-45e0-afc2-1292db58a59a"},
+{"id":4,"description":"Select a caterer","entry":"20120629T191919Z","project":"party","status":"pending","uuid":"c590941b-eb10-4569-bdc9-0e339f79305e"},
+{"id":5,"description":"Design invitations","entry":"20120629T191919Z","priority":"H","project":"party","status":"pending","tags":["mall"],"uuid":"e5a867b7-0116-457d-ba43-9ac2bee6ad2a"},
+{"id":6,"description":"Print invitations","entry":"20120629T191920Z","project":"party","status":"pending","tags":["mall"],"uuid":"9f6f3738-1c08-4f45-8eb4-1e90864c7588"}
+]

test/fixtures/party.json

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+[{"id":1,"description":"Select a free weekend in November","entry":"20120629T191421Z","priority":"H","project":"party","status":"pending","uuid":"6fd0ba4a-ab67-49cd-ac69-64aa999aff8a","annotations":[{"entry":"20120629T191534Z","description":"the 13th looks good"}]},
+{"id":2,"depends":"6fd0ba4a-ab67-49cd-ac69-64aa999aff8a","description":"Select and book a venue","entry":"20120629T191634Z","priority":"H","project":"party","status":"pending","uuid":"c992448a-f1ea-4982-8461-47f0705ff509"},
+{"id":3,"depends":"9f6f3738-1c08-4f45-8eb4-1e90864c7588","description":"Mail invitations","entry":"20120629T191919Z","project":"party","status":"pending","uuid":"3b53178e-d5a4-45e0-afc2-1292db58a59a"},
+{"id":4,"depends":"6fd0ba4a-ab67-49cd-ac69-64aa999aff8a","description":"Select a caterer","entry":"20120629T191919Z","project":"party","status":"pending","uuid":"c590941b-eb10-4569-bdc9-0e339f79305e"},
+{"id":5,"depends":"c992448a-f1ea-4982-8461-47f0705ff509","description":"Design invitations","entry":"20120629T191919Z","priority":"H","project":"party","status":"pending","tags":["mall"],"uuid":"e5a867b7-0116-457d-ba43-9ac2bee6ad2a"},
+{"id":6,"depends":"e5a867b7-0116-457d-ba43-9ac2bee6ad2a","description":"Print invitations","entry":"20120629T191920Z","project":"party","status":"pending","tags":["mall"],"uuid":"9f6f3738-1c08-4f45-8eb4-1e90864c7588"}
+]

test/test_helper.rb

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+# require 'bundler'
+# Bundler.require
+
+require 'twtest'
+require 'twdeps'
+
+module TaskWarrior
+  module Test
+    module Integration
+      class TestCase
+        def tasks
+          export_tasks
+        end
+
+        def fixture(name)
+          File.join(File.dirname(__FILE__), 'fixtures', name)
+        end
+      end
+    end
+  end
+end

test/unit/test_dependencies.rb

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+require 'test_helper'
+
+class DependencyBuilderTest < TaskWarrior::Test::Integration::TestCase
+  def test_no_dependencies
+    exec("import #{fixture('no_deps.json')}")
+    assert_equal(6, tasks.size)
+  end
+end

twdeps.gemspec

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+# -*- encoding: utf-8 -*-
+require File.expand_path('../lib/twdeps/version', __FILE__)
+
+Gem::Specification.new do |gem|
+  gem.authors       = ["Nicholas E. Rabenau"]
+  gem.email         = ["nerab@gmx.net"]
+  gem.description   = %q{TODO: Write a gem description}
+  gem.summary       = %q{TODO: Write a gem summary}
+  gem.homepage      = ""
+
+  gem.files         = `git ls-files`.split($\)
+  gem.executables   = gem.files.grep(%r{^bin/}).map{ |f| File.basename(f) }
+  gem.test_files    = gem.files.grep(%r{^(test|spec|features)/})
+  gem.name          = "twdeps"
+  gem.require_paths = ["lib"]
+  gem.version       = TaskWarrior::Dependencies::VERSION
+
+  gem.add_dependency 'ruby-graphviz', '~> 1.0'
+  gem.add_development_dependency 'twtest'
+end