Support --refresh-only option for plan and apply

lib/ruby_terraform/commands/apply.rb

@@ -47,6 +47,10 @@ module Commands
     # * +:refresh+: when +true+, updates state prior to checking for
     #   differences; when +false+ uses locally available state; defaults to
     #   +true+; this has no effect when +:plan+ is provided.
+    # * +:refresh_only+: when +true+, checks  whether remote objects still
+    #   match the outcome of the  most recent Terraform apply but does not
+    #   propose any actions to undo any changes made outside of Terraform; this
+    #   has no effect when +:plan+ is provided
     # * +:replace+: force replacement of a particular resource instance using
     #   its resource address. If the apply would've normally produced an update
     #   or no-op action for this instance, Terraform will replace it instead.
@@ -105,6 +109,7 @@ def options
           -no-color
           -parallelism
           -refresh
+          -refresh-only
           -replace
           -state
           -state-out

lib/ruby_terraform/commands/plan.rb

@@ -45,6 +45,9 @@ module Commands
     # * +:refresh+: when +true+, updates state prior to checking for
     #   differences; when +false+ uses locally available state; defaults to
     #   +true+; this has no effect when +:plan+ is provided.
+    # * +:refresh_only+: when +true+, checks  whether remote objects still
+    #   match the outcome of the  most recent Terraform apply but does not
+    #   propose any actions to undo any changes made outside of Terraform
     # * +:replace+: force replacement of a particular resource instance using
     #   its resource address. If the plan would've normally produced an update
     #   or no-op action for this instance, Terraform will plan to replace it
@@ -100,6 +103,7 @@ def options
           -out
           -parallelism
           -refresh
+          -refresh-only
           -replace
           -state
           -target

lib/ruby_terraform/options/definitions.rb

@@ -39,6 +39,7 @@ module Options
           -list
           -lock
           -refresh
+          -refresh-only
           -upgrade
           -verify-plugins
           -write

spec/ruby_terraform/commands/apply_spec.rb

@@ -90,6 +90,11 @@
     described_class, 'apply', :refresh
   )
 
+  it_behaves_like(
+    'a command with a boolean option',
+    described_class, 'apply', :refresh_only
+  )
+
   it_behaves_like(
     'a command with an option',
     described_class, 'apply', :state

spec/ruby_terraform/commands/plan_spec.rb

@@ -169,6 +169,11 @@
     described_class, 'plan', :refresh
   )
 
+  it_behaves_like(
+    'a command with a boolean option',
+    described_class, 'plan', :refresh_only
+  )
+
   it_behaves_like(
     'a command with an option',
     described_class, 'plan', :state