Handle non-git dirs

Nails #10

features/badger.feature

@@ -89,4 +89,21 @@ Feature: Badge Robot
      """
 [![License](http://img.shields.io/:license-mit-blue.svg)](http://doge.mit-license.org)
 [![License](http://img.shields.io/:license-mit-blue.svg)](http://doge.mit-license.org)
-     """
+     """
+
+   Scenario: handle a non-git-repo gracefully
+     When I run `badger badge /tmp`
+     Then the output should contain:
+     """
+Run this from inside a git repo
+     """
+     And the exit status should be 1
+
+   @no-remote
+   Scenario: handle a git repo without a github remote
+     When I run `badger badge /tmp/not_wow`
+     Then the output should contain:
+     """
+This repo does not appear to have a github remote
+     """
+     And the exit status should be 2

features/support/hooks.rb

@@ -18,3 +18,11 @@
   f.close
 end
 
+Before '@no-remote' do
+  Git.init '/tmp/not_wow'
+end
+
+After '@no-remote' do
+#  FileUtils.remove_dir '/tmp/not_wow', :force => true
+end
+

lib/badger/cli.rb

@@ -32,7 +32,20 @@ class CLI < Thor
     option :also, desc: 'Include this extra service (currently only \'mit\')'
 
     def badge dir = '.'
-      @badger = Badger.new Git.open(dir).remote.url
+      begin
+        @g = Git.open(dir)
+      rescue ArgumentError
+        puts 'Run this from inside a git repo'
+        exit 1
+      end
+
+      @r = @g.remote.url
+      if @r.nil?
+        puts 'This repo does not appear to have a github remote'
+        exit 2
+      end
+      @badger = Badger.new @r
+
       @badger.remove options[:not].split(',') if options[:not]
       @badger.only options[:only].split(',') if options[:only]
       @badger.also options[:also].split(',') if options[:also]