Patch to chef-dk to resolve issue #186

- Add powershell and cmd to chef shell-init
- Handle stray quotes in powershell
- Powershell documentation in help message

lib/chef-dk/command/shell_init.rb

@@ -22,7 +22,7 @@ module ChefDK
   module Command
     class ShellInit < ChefDK::Command::Base
 
-      SUPPORTED_SHELLS = %w[ bash zsh sh ].map(&:freeze).freeze
+      SUPPORTED_SHELLS = %w[ bash zsh sh powershell cmd].map(&:freeze).freeze
 
       banner(<<-HELP)
 Usage: chef shell-init
@@ -32,11 +32,19 @@ class ShellInit < ChefDK::Command::Base
 
   To enable for just the current shell session:
 
+  For sh, zsh, and bash:
     eval "$(chef shell-init SHELL_NAME)"
+  For powershell:
+    chef shell-init powershell | Invoke-Expression
 
   To permanently enable:
 
+  For sh, zsh, and bash:
     echo 'eval "$(chef shell-init SHELL_NAME)"' >> ~/.YOUR_SHELL_RC_FILE
+  For powershell:
+    "chef shell-init powershell | Invoke-Expression" >> $PROFILE
+
+Supported shells: #{SUPPORTED_SHELLS.join(' ')}
 
 OPTIONS:
 
@@ -51,8 +59,6 @@ def omnibus_root
       end
 
       def run(argv)
-        # Currently we don't have any shell-specific features, so we ignore the
-        # shell name. We'll need it if we add completion.
         remaining_args = parse_options(argv)
         shell_name = remaining_args.first
         if shell_name.nil?
@@ -67,9 +73,36 @@ def run(argv)
 
         env = omnibus_env.dup
         path = env.delete("PATH")
-        msg("export PATH=#{path}")
-        env.each do |var_name, value|
-          msg("export #{var_name}=#{value}")
+        if shell_name == "powershell"
+          # some of these environment variables have quotes around them as written
+          # if that is not the case, add them for powershell set-item invocation
+          quotechars = %w[ ' " ]
+          if (!quotechars.include?(path[0]))
+            path = "'#{path}'"
+          end
+          # note that this requires the fix for #180
+          # https://github.com/opscode/chef-dk/issues/180
+          msg("Set-Item Env:\\PATH #{path}")
+          env.each do |var_name, value|
+            # some of these environment variables have quotes around them as written
+            # if that is not the case, add them for powershell set-item invocation
+            if (!quotechars.include?(value[0]))
+              value = "'#{value}'"
+            end
+            msg("Set-Item Env:\\#{var_name} #{value}")
+          end
+        elsif shell_name == "cmd"
+          # note that this requires the fix for #180
+          # https://github.com/opscode/chef-dk/issues/180
+          msg("SET PATH=#{path}")
+          env.each do |var_name, value|
+            msg("SET #{var_name}=#{value}")
+          end
+        else
+          msg("export PATH=#{path}")
+          env.each do |var_name, value|
+            msg("export #{var_name}=#{value}")
+          end
         end
         0
       end