From 046a2e7c1389e58d86d5736a2a5616f34035810e Mon Sep 17 00:00:00 2001
From: danielsdeleo <dan@chef.io>
Date: Fri, 12 Jun 2015 15:00:58 -0700
Subject: [PATCH] Add paging support when showing a specific policy

---
 lib/chef-dk/command/show_policy.rb                | 13 ++++++++++++-
 lib/chef-dk/policyfile_services/show_policy.rb    | 11 +++++++++--
 spec/unit/policyfile_services/show_policy_spec.rb |  4 ++++
 3 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/lib/chef-dk/command/show_policy.rb b/lib/chef-dk/command/show_policy.rb
index ccf65c60b..ff967bc5d 100644
--- a/lib/chef-dk/command/show_policy.rb
+++ b/lib/chef-dk/command/show_policy.rb
@@ -53,6 +53,12 @@ class ShowPolicy < Base
         description:  "Show policy revisions that are unassigned",
         default:      false
 
+      option :pager,
+        long:        "--[no-]pager",
+        description: "Enable/disable paged policyfile lock ouput (default: enabled)",
+        default:     true,
+        boolean:     true
+
       option :config_file,
         short:        "-c CONFIG_FILE",
         long:         "--config CONFIG_FILE",
@@ -96,7 +102,8 @@ def show_policy_service
                                              policy_name: policy_name,
                                              policy_group: policy_group,
                                              show_orphans: show_orphans?,
-                                             summary_diff: show_summary_diff?)
+                                             summary_diff: show_summary_diff?,
+                                             pager: enable_pager?)
       end
 
       def debug?
@@ -111,6 +118,10 @@ def show_orphans?
         config[:show_orphans]
       end
 
+      def enable_pager?
+        config[:pager]
+      end
+
       def handle_error(error)
         ui.err("Error: #{error.message}")
         if error.respond_to?(:reason)
diff --git a/lib/chef-dk/policyfile_services/show_policy.rb b/lib/chef-dk/policyfile_services/show_policy.rb
index d2a8e6513..6d824e85c 100644
--- a/lib/chef-dk/policyfile_services/show_policy.rb
+++ b/lib/chef-dk/policyfile_services/show_policy.rb
@@ -17,6 +17,7 @@
 
 require 'chef-dk/policyfile/comparison_base'
 require 'chef-dk/policyfile/lister'
+require 'chef-dk/pager'
 
 module ChefDK
   module PolicyfileServices
@@ -67,13 +68,14 @@ def list(items)
 
       attr_reader :policy_group
 
-      def initialize(config: nil, ui: nil, policy_name: nil, policy_group: nil, show_orphans: false, summary_diff: false)
+      def initialize(config: nil, ui: nil, policy_name: nil, policy_group: nil, show_orphans: false, summary_diff: false, pager: false)
         @chef_config = config
         @ui = ui
         @policy_name = policy_name
         @policy_group = policy_group
         @show_orphans = show_orphans
         @summary_diff = summary_diff
+        @enable_pager = pager
       end
 
       def run
@@ -107,6 +109,10 @@ def show_summary_diff?
         @summary_diff
       end
 
+      def enable_pager?
+        @enable_pager
+      end
+
       def report
         @report ||= ReportPrinter.new(ui)
       end
@@ -117,7 +123,8 @@ def policy_lister
 
       def display_policy_revision
         lock = Policyfile::ComparisonBase::PolicyGroup.new(policy_group, policy_name, http_client).lock
-        ui.msg(FFI_Yajl::Encoder.encode(lock, pretty: true))
+        pager = Pager.new(enable_pager: enable_pager?)
+        pager.with_pager { |p| p.ui.msg(FFI_Yajl::Encoder.encode(lock, pretty: true)) }
       end
 
       def display_all_policies
diff --git a/spec/unit/policyfile_services/show_policy_spec.rb b/spec/unit/policyfile_services/show_policy_spec.rb
index c64195831..46553fbbd 100644
--- a/spec/unit/policyfile_services/show_policy_spec.rb
+++ b/spec/unit/policyfile_services/show_policy_spec.rb
@@ -819,7 +819,11 @@
 
       let(:policyfile_lock_json) { FFI_Yajl::Encoder.encode(policyfile_lock_data, pretty: true) }
 
+      let(:pager) { instance_double("ChefDK::Pager", ui: ui) }
+
       before do
+        allow(ChefDK::Pager).to receive(:new).and_return(pager)
+        allow(pager).to receive(:with_pager).and_yield(pager)
         allow(http_client).to receive(:get).with("policy_groups/dev/policies/appserver").and_return(policyfile_lock_data)
       end