add create draft Pull Request option

README.md

@@ -107,6 +107,15 @@ You can specify this value by `GIT_PR_RELEASE_SSL_NO_VERIFY` to `1`.
 
 If not specified, verify SSL certificate always.
 
+### `pr-release.draft`
+
+The pull request is draft no not.
+Accepted values: `true` | `false`
+
+You can specify this value by `GIT_PR_RELEASE_DRAFT` environment variable.
+
+Default value: `false`.
+
 ## Errors and exit statuses
 
 ### No pull requests to be released

lib/git/pr/release/cli.rb

@@ -6,7 +6,7 @@ module Pr
     module Release
       class CLI
         include Git::Pr::Release::Util
-        attr_reader :repository, :production_branch, :staging_branch, :template_path, :labels
+        attr_reader :repository, :production_branch, :staging_branch, :template_path, :labels, :draft
 
         def self.start
           result = self.new.start
@@ -82,11 +82,18 @@ def configure
           _labels = ENV.fetch('GIT_PR_RELEASE_LABELS') { git_config('labels') }
           @labels = _labels && _labels.split(/\s*,\s*/) || []
 
+          _draft = ENV.fetch('GIT_PR_RELEASE_DRAFT') { git_config('draft') } || false
+          @draft = to_boolean(_draft)
+          if draft.nil?
+            raise "#{_draft} is not boolean. set true or false."
+          end
+
           say "Repository:        #{repository}", :debug
           say "Production branch: #{production_branch}", :debug
           say "Staging branch:    #{staging_branch}", :debug
           say "Template path:     #{template_path}", :debug
           say "Labels             #{labels}", :debug
+          say "Draft              #{draft}", :debug
         end
 
         def fetch_merged_prs
@@ -226,7 +233,8 @@ def detect_existing_release_pr
 
         def prepare_release_pr
           client.create_pull_request(
-            repository, production_branch, staging_branch, 'Preparing release pull request...', ''
+            repository, production_branch, staging_branch, 'Preparing release pull request...', '',
+            { draft: draft }
           )
         end
 

lib/git/pr/release/util.rb

@@ -199,6 +199,24 @@ def request_authorization(client, two_factor_code)
 
           auth
         end
+
+        def to_boolean(flag)
+          case flag
+          when TrueClass, FalseClass
+            flag
+          when String
+            flag = flag.downcase
+            if flag == 'true'
+              true
+            elsif flag == 'false'
+              false
+            else
+              nil
+            end
+          else
+            nil
+          end
+        end
       end
     end
   end

spec/git/pr/release/cli_spec.rb

@@ -76,6 +76,7 @@
         expect(@cli.staging_branch).to eq "staging"
         expect(@cli.template_path).to eq nil
         expect(@cli.labels).to eq []
+        expect(@cli.draft).to eq false
       end
     end
 
@@ -181,6 +182,58 @@
         end
       end
     end
+
+    describe "draft" do
+      context "When draft is not set" do
+        it "draft is false" do
+          subject
+
+          expect(@cli.draft).to eq false
+        end
+      end
+
+      context "When draft is set by ENV" do
+        around do |example|
+          original = ENV.to_hash
+          begin
+            ENV["GIT_PR_RELEASE_DRAFT"] = 'true'
+            example.run
+          ensure
+            ENV.replace(original)
+          end
+        end
+
+        it "draft is configured" do
+          subject
+
+          expect(@cli.draft).to eq true
+        end
+      end
+
+      context "When draft is set by git_config" do
+        before {
+          allow(@cli).to receive(:git_config).with("draft") { true }
+        }
+
+        it "draft is configured" do
+          subject
+
+          expect(@cli.draft).to eq true
+        end
+      end
+
+      context "When draft is not set true | false" do
+        let(:draft) { 'not_true' }
+
+        before {
+          allow(@cli).to receive(:git_config).with("draft") { draft }
+        }
+
+        it "draft is configured" do
+          expect { subject }.to raise_error("#{draft} is not boolean. set true or false.")
+        end
+      end
+    end
   end
 
   describe "#fetch_merged_prs" do
@@ -368,6 +421,7 @@
         "staging",
         "Preparing release pull request...",
         "", # empby body
+        { draft: @cli.draft }
       )
     }
   end