add Guard support (#4)

Fixes #4.

Gemfile.lock

@@ -2,6 +2,9 @@ PATH
   remote: .
   specs:
     ansible-viz (0.1.0)
+      guard
+      guard-minitest
+      guard-rspec
       mustache (~> 0.99.4)
       rake
       word_wrap
@@ -14,7 +17,31 @@ GEM
     coderay (1.1.2)
     diff-lcs (1.3)
     docile (1.1.5)
+    ffi (1.9.21)
+    formatador (0.2.5)
+    guard (2.14.2)
+      formatador (>= 0.2.4)
+      listen (>= 2.7, < 4.0)
+      lumberjack (>= 1.0.12, < 2.0)
+      nenv (~> 0.1)
+      notiffany (~> 0.0)
+      pry (>= 0.9.12)
+      shellany (~> 0.0)
+      thor (>= 0.18.1)
+    guard-compat (1.2.1)
+    guard-minitest (2.4.6)
+      guard-compat (~> 1.2)
+      minitest (>= 3.0)
+    guard-rspec (4.7.3)
+      guard (~> 2.1)
+      guard-compat (~> 1.1)
+      rspec (>= 2.99.0, < 4.0)
     json (2.1.0)
+    listen (3.1.5)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
+      ruby_dep (~> 1.2)
+    lumberjack (1.0.12)
     method_source (0.9.0)
     minitest (5.11.3)
     minitest-reporters (1.1.19)
@@ -23,10 +50,17 @@ GEM
       minitest (>= 5.0)
       ruby-progressbar
     mustache (0.99.8)
+    nenv (0.3.0)
+    notiffany (0.1.1)
+      nenv (~> 0.1)
+      shellany (~> 0.0)
     pry (0.11.3)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     rake (12.3.0)
+    rb-fsevent (0.10.2)
+    rb-inotify (0.9.10)
+      ffi (>= 0.5.0, < 2)
     rspec (3.7.0)
       rspec-core (~> 3.7.0)
       rspec-expectations (~> 3.7.0)
@@ -41,11 +75,14 @@ GEM
       rspec-support (~> 3.7.0)
     rspec-support (3.7.1)
     ruby-progressbar (1.9.0)
+    ruby_dep (1.5.0)
+    shellany (0.0.1)
     simplecov (0.15.1)
       docile (~> 1.1.0)
       json (>= 1.8, < 3)
       simplecov-html (~> 0.10.0)
     simplecov-html (0.10.2)
+    thor (0.20.0)
     word_wrap (1.0.0)
 
 PLATFORMS

Guardfile

@@ -0,0 +1,24 @@
+directories %w(test spec) \
+ .select{|d| Dir.exists?(d) ? d : UI.warning("Directory #{d} does not exist")}
+
+guard :rspec, cmd: "bundle exec rspec", all_on_start: false do
+  require "guard/rspec/dsl"
+  dsl = Guard::RSpec::Dsl.new(self)
+
+  # RSpec files
+  rspec = dsl.rspec
+  watch(rspec.spec_helper) { rspec.spec_dir }
+  watch(rspec.spec_support) { rspec.spec_dir }
+  watch(rspec.spec_files)
+
+  # Ruby files
+  ruby = dsl.ruby
+  dsl.watch_spec_files_for(ruby.lib_files)
+end
+
+guard :minitest, all_on_start: false do
+  # with Minitest::Unit
+  watch(%r{^test/(.*)\/?test_(.*)\.rb$})
+  watch(%r{^lib/(.*/)?([^/]+)\.rb$})     { |m| "test/#{m[1]}test_#{m[2]}.rb" }
+  watch(%r{^test/test_helper\.rb$})      { 'test' }
+end

ansible-viz.gemspec

@@ -23,6 +23,9 @@ Gem::Specification.new do |s|
   s.add_development_dependency "minitest", "~> 5.0"
   s.add_development_dependency "minitest-reporters"
   s.add_development_dependency "simplecov"
+  s.add_dependency "guard"
+  s.add_dependency "guard-rspec"
+  s.add_dependency "guard-minitest"
 
   s.bindir = "bin"
   s.files        = %w(README.md LICENSE)

spec/loader_spec.rb

@@ -1,3 +1,7 @@
+# This seems to be required for guard-rspec to work; presumably it
+# ignores .rspec in some rspec runs.
+require "spec_helper"
+
 require "ansible_viz/loader"
 
 RSpec.describe Loader do

spec/spec_helper.rb

@@ -1,3 +1,5 @@
+require 'rspec'
+
 # This file was generated by the `rspec --init` command. Conventionally, all
 # specs live under a `spec` directory, which RSpec adds to the `$LOAD_PATH`.
 # The generated `.rspec` file contains `--require spec_helper` which will cause