Add version command (#30)

* Add version command

* Update changelog

CHANGELOG.md

@@ -5,7 +5,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
-- No unreleased changes!
+### Added
+- Version command, which outputs the installed version of the gem ([#30](https://github.com/pacso/aoc_rb/pull/30) by [@pacso](https://github.com/pacso))
 
 ## [0.2.6]
 ### Changed

lib/aoc_rb/app.rb

@@ -142,6 +142,12 @@ def prep(year = options[:year], day = options[:day])
       fetch(year, day)
       bootstrap(year, day)
     end
+
+    desc "version", "prints the current installed version of AocRb"
+
+    def version
+      puts "AocRb version #{AocRb::VERSION}"
+    end
   end
 end
 

lib/aoc_rb/cli.rb

@@ -47,6 +47,12 @@ def new(name)
       gemfile_src = File.join(File.dirname(__FILE__), "../../templates/Gemfile")
       File.open(gemfile_dst, "w") { |f| f.write(File.read(gemfile_src))}
     end
+
+    desc "version", "prints the current installed version of AocRb"
+
+    def version
+      puts "AocRb version #{AocRb::VERSION}"
+    end
   end
 end
 

spec/lib/aoc_rb/app_spec.rb

@@ -456,4 +456,12 @@
       end
     end
   end
+
+  describe "version" do
+    it "returns the current version" do
+      within_test_app do
+        expect { AocRb::App.start %w(version) }.to output("AocRb version #{AocRb::VERSION}\n").to_stdout
+      end
+    end
+  end
 end

spec/system/aoc_spec.rb

@@ -8,8 +8,10 @@
   end
 
   it "can create a new project" do
-    expect { system %(aoc new dummy) }
-      .to change { File.exist? "dummy" }
-            .from(false).to(true)
+    expect { `aoc new dummy` }.to change { File.exist? "dummy" }.from(false).to(true)
+  end
+
+  it "can output the installed version" do
+    expect(`aoc version`).to eq "AocRb version #{AocRb::VERSION}\n"
   end
 end