v0.3.4

.github/workflows/ci.yml

@@ -60,13 +60,15 @@ jobs:
     strategy:
       matrix:
         os:
+          - macos-14
           - macos-latest
+          - ubuntu-22.04
           - ubuntu-latest
         ruby:
-          - ruby-2.6
-          - ruby-2.7
-          - ruby-3.0
           - ruby-3.1
+          - ruby-3.2
+          - ruby-3.3
+          - ruby-3.4
           # - jruby
           # - truffleruby
     runs-on: ${{ matrix.os }}

.rubocop.yml

@@ -1,10 +1,10 @@
-require:
+plugins:
   - rubocop-performance
   - rubocop-rake
   - rubocop-rspec
 
 AllCops:
-  TargetRubyVersion: 2.6
+  TargetRubyVersion: 3.0
   Exclude:
     - bin/**/*
     - vendor/**/*
@@ -148,6 +148,9 @@ RSpec/ExampleLength:
     - hash
     - heredoc
 
+RSpec/IncludeExamples:
+  Enabled: false
+
 RSpec/MultipleMemoizedHelpers:
   Max: 20
 

handlebars-engine.gemspec

@@ -23,7 +23,7 @@ Gem::Specification.new do |spec|
 
   spec.homepage = "https://github.com/gi/handlebars-ruby"
   spec.license = "MIT"
-  spec.required_ruby_version = ">= 2.6.0"
+  spec.required_ruby_version = ">= 3.0"
 
   spec.metadata["changelog_uri"] = "#{spec.homepage}/CHANGELOG.md"
   spec.metadata["github_repo"] = spec.homepage

lib/handlebars/engine.rb

@@ -21,7 +21,8 @@ class Engine
     #   environment.
     # @param path [String, nil] the path to the version of Handlebars to load.
     #   If `nil`, the contents of `Handlebars::Source.bundled_path` is loaded.
-    def initialize(lazy: false, path: nil)
+    def initialize(lazy: false, logger: nil, path: nil)
+      @logger = logger
       @path = path
       init! unless lazy
     end
@@ -84,9 +85,9 @@ def register_helper(name = nil, function = nil, **helpers, &block)
         case f
         when Proc
           attach(n, &f)
-          evaluate("registerHelper('#{n}', #{n})")
+          evaluate("registerRbHelper('#{n}', #{n})")
         when String, Symbol
-          evaluate("Handlebars.registerHelper('#{n}', #{f})")
+          evaluate("registerJsHelper('#{n}', #{f})")
         end
       end
     end
@@ -175,13 +176,16 @@ def version
 
     def attach(name, &block)
       init!
+      @logger&.debug { "[handlebars] attaching #{name}" }
       @context.attach(name.to_s, block)
     end
 
     def call(name, args, assign: false, eval: false)
       init!
       name = name.to_s
 
+      @logger&.debug { "[handlebars] calling #{name} with args #{args}" }
+
       if assign || eval
         call_via_eval(name, args, assign: assign)
       else
@@ -207,6 +211,7 @@ def call_via_eval(name, args, assign: false)
     end
 
     def evaluate(code)
+      @logger&.debug { "[handlebars] evaluating #{code}" }
       @context.eval(code)
     end
 
@@ -222,10 +227,18 @@ def helper_missing_name(type)
     def init!
       return if @init
 
+      @logger&.debug { "[handlebars] initializing" }
+
       @context = MiniRacer::Context.new
+      @context.attach(
+        "console.log",
+        ->(*args) { @logger&.debug { "[handlebars] #{args.join(" ")}" } },
+      )
       @context.load(@path || ::Handlebars::Source.bundled_path)
       @context.load(File.absolute_path("engine/init.js", __dir__))
 
+      @logger&.debug { "[handlebars] initialized" }
+
       @init = true
     end
 

lib/handlebars/engine/function.rb

@@ -4,12 +4,14 @@ module Handlebars
   class Engine
     # A proxy for a JavaScript function defined in the context.
     class Function
-      def initialize(context, name)
+      def initialize(context, name, logger: nil)
         @context = context
+        @logger = logger
         @name = name
       end
 
       def call(*args)
+        @logger&.debug { "[handlebars] calling #{@name} with args #{args}" }
         @context.call(@name, *args)
       end
     end

lib/handlebars/engine/init.js

@@ -16,14 +16,23 @@ var template = (spec) => {
 var registerPartial = Handlebars.registerPartial.bind(Handlebars);
 var unregisterPartial = Handlebars.unregisterPartial.bind(Handlebars);
 
-var registerHelper = (...args) => {
-  const fn = args[args.length - 1];
+var registerJsHelper = Handlebars.registerHelper.bind(Handlebars);
+
+var registerRbHelper = (name, fn) => {
   function wrapper(...args) {
+    // Ruby cannot access the `this` context, so pass it as the first argument.
     args.unshift(this);
+    const { ...options } = args[args.length-1];
+    Object.entries(options).forEach(([key, value]) => {
+      if (typeof value === "function") {
+        // functions are cannot be passed back to Ruby
+        options[key] = "function";
+      }
+    });
+    args[args.length-1] = options
     return fn(...args);
   }
-  args[args.length - 1] = wrapper;
-  return Handlebars.registerHelper(...args);
+  return registerJsHelper(name, wrapper);
 };
 
 var unregisterHelper = Handlebars.unregisterHelper.bind(Handlebars);

spec/handlebars/engine_spec.rb

@@ -1,11 +1,14 @@
 # frozen_string_literal: true
 
+require "logger"
 require "tempfile"
 
 RSpec.describe Handlebars::Engine do
   let(:engine) { described_class.new(**engine_options) }
   let(:engine_context) { engine.instance_variable_get(:@context) }
   let(:engine_options) { {} }
+  let(:log) { Tempfile.new }
+  let(:logger) { Logger.new(log, level: Logger::FATAL) }
   let(:render) { renderer.call(render_context, render_options) }
   let(:render_context) { { name: "Zach", age: 30 } }
   let(:render_options) { {} }
@@ -40,7 +43,26 @@
       end
 
       it "does not create the context" do
-        expect(engine_context).to be nil
+        expect(engine_context).to be_nil
+      end
+    end
+
+    context "when `logger` is defined" do
+      before do
+        engine_options[:logger] = logger
+        logger.debug!
+      end
+
+      it "logs initialization" do
+        engine
+        log.rewind
+        expect(log.read).to include("[handlebars] initializing")
+      end
+
+      it "logs javascript" do
+        engine.send(:evaluate, "console.log('js', 'log')")
+        log.rewind
+        expect(log.read).to include("[handlebars] js log")
       end
     end
 
@@ -255,7 +277,7 @@
         describe "the options" do
           it "includes the main block function" do
             opts = include(
-              "fn" => kind_of(MiniRacer::JavaScriptFunction),
+              "fn" => "function", # kind_of(MiniRacer::JavaScriptFunction),
             )
             args = [anything, any_args, opts]
             render
@@ -264,7 +286,7 @@
 
           it "includes the else block function" do
             opts = include(
-              "inverse" => kind_of(MiniRacer::JavaScriptFunction),
+              "inverse" => "function", # kind_of(MiniRacer::JavaScriptFunction),
             )
             args = [anything, any_args, opts]
             render
@@ -279,6 +301,14 @@
         <<~JS
           function (...args) {
             args.unshift(this);
+            const { ...options } = args[args.length-1];
+            Object.entries(options).forEach(([key, value]) => {
+              if (typeof value === "function") {
+                // functions are cannot be passed back to Ruby
+                options[key] = "function";
+              }
+            });
+            args[args.length-1] = options
             return tester(...args);
           }
         JS