From 48ace490fec6f00d6e25bdce25576ff9181dcd18 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alexander=20Gra=CC=88fe?= <alexander.graefe@googlemail.com>
Date: Sun, 13 Jul 2025 17:49:10 +0200
Subject: [PATCH] Make the rendering of Prawn templates idempotent

---
 lib/tilt/prawn.rb               | 3 +--
 test/tilt_prawntemplate.prawn   | 1 +
 test/tilt_prawntemplate_test.rb | 7 ++++++-
 3 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/lib/tilt/prawn.rb b/lib/tilt/prawn.rb
index 35ad8a3..63cd7e5 100644
--- a/lib/tilt/prawn.rb
+++ b/lib/tilt/prawn.rb
@@ -10,11 +10,10 @@ class PrawnTemplate < Template
     def prepare
       @options[:page_size] = 'A4' unless @options.has_key?(:page_size)
       @options[:page_layout] = :portrait unless @options.has_key?(:page_layout)
-      @engine = ::Prawn::Document.new(@options)
     end
     
     def evaluate(scope, locals, &block)
-      pdf = @engine
+      pdf = ::Prawn::Document.new(@options)
       locals = locals.dup
       locals[:pdf] = pdf
       super
diff --git a/test/tilt_prawntemplate.prawn b/test/tilt_prawntemplate.prawn
index 91603c3..4b7d0b2 100644
--- a/test/tilt_prawntemplate.prawn
+++ b/test/tilt_prawntemplate.prawn
@@ -1 +1,2 @@
 pdf.text "Hello Template!"
+pdf.start_new_page
diff --git a/test/tilt_prawntemplate_test.rb b/test/tilt_prawntemplate_test.rb
index abd0840..c908def 100644
--- a/test/tilt_prawntemplate_test.rb
+++ b/test/tilt_prawntemplate_test.rb
@@ -9,6 +9,10 @@ def initialize(pdf_raw)
     def text
       @reader.pages.map(&:text).join
     end
+
+    def page_count
+      @reader.page_count
+    end
     
     def page_attributes(page_num=1)
       @reader.page(page_num).attributes
@@ -39,7 +43,8 @@ def page_attributes(page_num=1)
     template = Tilt::PrawnTemplate.new("test/tilt_prawntemplate.prawn")
     3.times do
       output   = _PdfOutput.new(template.render)
-      assert_includes output.text, "Hello Template!"
+      assert_equal 2, output.page_count
+      assert_equal output.text, "Hello Template!"
     end
   end