Add config options additional_fonts and default_font_name

CHANGELOG.md

@@ -1,7 +1,7 @@
 # Changelog
 
 * `Unreleased` - [View Diff](https://github.com/cortiz/prawn-rails/compare/v1.5.0...master)
-  - Nothing yet
+  - [#55](https://github.com/cortiz/prawn-rails/pull/55) - Add config options `additional_fonts` and `default_font_name`
 
 * `v1.5.0` - [View Diff](https://github.com/cortiz/prawn-rails/compare/v1.4.2...v1.5.0)
   - [#52](https://github.com/cortiz/prawn-rails/pull/52) - Add active_support as a dependency and use the active_support lazy load hooks

README.md

@@ -60,9 +60,21 @@ Add a `prawn-rails.rb` config to your Rails app under `config/initializers` like
 
 ```ruby
 PrawnRails.config do |config|
+  # Prawn::Document options
   config.page_layout = :portrait
   config.page_size   = "A4"
   config.skip_page_creation = false
+
+  # PrawnRails options
+  config.additional_fonts = {
+    "some-custom-font" => {
+       normal: Rails.root.join('app/assets/fonts/print/some-custom-font.ttf'),
+       italic: Rails.root.join('app/assets/fonts/print/some-custom-font-italic.ttf'),
+       bold: Rails.root.join('app/assets/fonts/print/some-custom-font-bold.ttf'),
+       bold_italic: Rails.root.join('app/assets/fonts/print/some-custom-font-bold-italic.ttf'),
+     },
+  }
+  config.default_font_name = "some-custom-font"
 end
 ```
 

lib/prawn-rails/config.rb

@@ -26,6 +26,8 @@ def method_missing(method_name, *args)
     page_layout: :portrait,
     page_size: "A4",
     skip_page_creation: false,
+    additional_fonts: nil,
+    default_font_name: nil,
   )
 
   def config(&block)

lib/prawn-rails/document.rb

@@ -4,7 +4,7 @@
 module PrawnRails
   class Document < Prawn::Document
     def initialize(options = {})
-      options = PrawnRails.config.merge(options)
+      options = PrawnRails.config.except(:additional_fonts, :default_font_name).merge(options)
 
       super(options)
     end
@@ -16,5 +16,21 @@ def text(value, options = {})
       # To circumvent this situation, we call to_s on value, and delegate action to actual Prawn::Document
       super(value.to_s, options)
     end
+
+    def start_new_page(options = {})
+      return_val = super
+
+      if state.page_count == 1
+        if PrawnRails.config.additional_fonts
+          font_families.update(PrawnRails.config.additional_fonts)
+        end
+
+        if PrawnRails.config.default_font_name
+          font(PrawnRails.config.default_font_name)
+        end
+      end
+
+      return_val
+    end
   end
 end

test/test_helper.rb

@@ -21,3 +21,17 @@
 
 require 'pry'
 require 'pdf/reader'
+
+DEFAULT_CONFIG ||= PrawnRails.config.clone
+
+def restore_default_config
+  PrawnRails.config do |config|
+    config.keys.each do |key|
+      config.delete(key)
+    end
+
+    DEFAULT_CONFIG.each do |k,v|
+      config[k] = v
+    end
+  end
+end

test/unit/config_test.rb

@@ -2,24 +2,18 @@
 
 class ConfigTest < ActiveSupport::TestCase
 
-  def setup
-    @original_config = PrawnRails.config.clone
-  end
-
   def teardown
-    PrawnRails.config do |config|
-      config.keys.each do |key|
-        config.delete(key)
-      end
-
-      @original_config.each do |k,v|
-        config[k] = v
-      end
-    end
+    restore_default_config
   end
 
   test "has a default config" do
-    assert_equal PrawnRails.config.symbolize_keys, {page_layout: :portrait, page_size: "A4", skip_page_creation: false}
+    assert_equal PrawnRails.config.symbolize_keys, {
+      page_layout: :portrait,
+      page_size: "A4",
+      skip_page_creation: false,
+      default_font_name: nil,
+      additional_fonts: nil,
+    }
   end
 
   test "config can be set with block syntax" do
@@ -28,7 +22,13 @@ def teardown
       config.page_size = "A8"
     end
 
-    assert_equal PrawnRails.config.symbolize_keys, {page_layout: :landscape, page_size: "A8", skip_page_creation: false}
+    assert_equal PrawnRails.config.symbolize_keys, {
+      page_layout: :landscape,
+      page_size: "A8",
+      skip_page_creation: false,
+      default_font_name: nil,
+      additional_fonts: nil,
+    }
   end
 
   test "allows reading any hash value via method syntax" do

test/unit/rails_helpers_test.rb

@@ -5,6 +5,10 @@
 class RailsHelperTest < ActiveSupport::TestCase
   include PrawnRails::RailsHelper
 
+  def teardown
+    restore_default_config
+  end
+
   test "matches .PDF extension regardless of case" do
     ["pDf", "pdf", "PDF"].each do |ext|
       @filename = "test.#{ext}"
@@ -18,4 +22,39 @@ class RailsHelperTest < ActiveSupport::TestCase
     end
   end
 
+  test "config.default_font_name" do
+    font_name = "Arial"
+
+    PrawnRails.config.default_font_name = "Arial"
+
+    font_path = Rails.root.join("app/assets/stylesheets/fonts/Arial.ttf")
+
+    PrawnRails.config.additional_fonts = {
+      "Arial" => {
+        normal: font_path,
+        italic: font_path,
+        bold: font_path,
+        bold_italic: font_path,
+      },
+    }
+
+    prawn_document do |pdf|
+      assert_equal pdf.font.family, "Arial"
+
+      pdf.text "foo"
+    end
+
+    prawn_document(skip_page_creation: true) do |pdf|
+      assert_raises(Prawn::Errors::NotOnPage) do
+        pdf.font
+      end
+
+      pdf.start_new_page
+
+      assert_equal pdf.font.family, "Arial"
+
+      pdf.text "foo"
+    end
+  end
+
 end