From 71caf160be8eda3442fcb4d5293a30f6eab6f45f Mon Sep 17 00:00:00 2001
From: Thibault Jouan <tj@a13.fr>
Date: Sat, 18 Apr 2015 17:03:25 +0000
Subject: [PATCH] Add version CLI option

---
 features/cli/version.feature   |  6 ++++++
 features/steps/output_steps.rb |  6 ++++++
 lib/uh/wm/cli.rb               |  5 +++++
 spec/uh/wm/cli_spec.rb         | 15 +++++++++++++++
 4 files changed, 32 insertions(+)
 create mode 100644 features/cli/version.feature

diff --git a/features/cli/version.feature b/features/cli/version.feature
new file mode 100644
index 0000000..5aa1420
--- /dev/null
+++ b/features/cli/version.feature
@@ -0,0 +1,6 @@
+Feature: version CLI option
+
+  Scenario: prints the current version on standard output
+    When I run uhwm with option --version
+    Then uhwm must terminate successfully
+    And the output must contain exactly the version
diff --git a/features/steps/output_steps.rb b/features/steps/output_steps.rb
index 78fbc5d..81a46b6 100644
--- a/features/steps/output_steps.rb
+++ b/features/steps/output_steps.rb
@@ -10,9 +10,15 @@ options:
     -r, --require PATH               require ruby feature
     -l, --layout LAYOUT              specify layout
     -w, --worker WORKER              specify worker
+    -V, --version                    print version
   eoh
 end
 
+Then /^the output must contain exactly the version$/ do
+  #require File.expand_path('../lib/uh/wm/version', __FILE__)
+  assert_exact_output "%s\n" % Uh::WM::VERSION, all_output
+end
+
 Then /^the output must match \/([^\/]+)\/([a-z]*)$/ do |pattern, options|
   uhwm_wait_output Regexp.new(pattern, options)
 end
diff --git a/lib/uh/wm/cli.rb b/lib/uh/wm/cli.rb
index 3b07358..1c057bd 100644
--- a/lib/uh/wm/cli.rb
+++ b/lib/uh/wm/cli.rb
@@ -82,6 +82,11 @@ module Uh
               'specify worker' do |worker|
             @env.worker = worker.to_sym
           end
+
+          opts.on_tail '-V', '--version', 'print version' do
+            @env.puts VERSION
+            exit
+          end
         end
       end
     end
diff --git a/spec/uh/wm/cli_spec.rb b/spec/uh/wm/cli_spec.rb
index 027546c..3214741 100644
--- a/spec/uh/wm/cli_spec.rb
+++ b/spec/uh/wm/cli_spec.rb
@@ -185,6 +185,21 @@ module Uh
           end
         end
 
+        context 'with version option' do
+          let(:arguments) { %w[-V] }
+
+          it 'prints the version on standard output' do
+            trap_exit { cli.parse_arguments! }
+            expect(stdout.string).to eq "#{::Uh::WM::VERSION}\n"
+          end
+
+          it 'exits with a return status of 0' do
+            expect { cli.parse_arguments! }.to raise_error(SystemExit) do |e|
+              expect(e.status).to eq 0
+            end
+          end
+        end
+
         context 'with invalid option' do
           let(:arguments) { %w[--unknown-option] }