Syntax Highlight using Prism (#1091)

* Colorize using Prism

* Add prism version ci matrix

Author: tompng

.github/workflows/test.yml

@@ -50,6 +50,26 @@ jobs:
         run: bundle exec rake test
       - name: Run tests in isolation
         run: bundle exec rake test_in_isolation
+  prism-version-test:
+    needs: ruby-versions
+    name: rake test prism-${{ matrix.prism_version }}
+    strategy:
+      matrix:
+        prism_version: ['1.3.0', '1.7.0', 'latest']
+      fail-fast: false
+    runs-on: ubuntu-latest
+    env:
+      PRISM_VERSION: ${{matrix.prism_version}}
+    timeout-minutes: 30
+    steps:
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ fromJson(needs.ruby-versions.outputs.latest) }}
+          bundler-cache: true
+      - name: Run tests
+        run: bundle exec rake test
   debug-test:
     if: github.repository == 'ruby/irb' || github.event_name != 'schedule'
     name: Debug compatibility test

Gemfile

@@ -24,6 +24,12 @@ gem "debug", github: "ruby/debug"
 
 gem "rdoc", ">= 6.11.0"
 
+if ENV['PRISM_VERSION'] == 'latest'
+  gem "prism", github: "ruby/prism"
+elsif ENV['PRISM_VERSION']
+  gem "prism", ENV['PRISM_VERSION']
+end
+
 if RUBY_VERSION >= "3.0.0" && !is_truffleruby
   # TODO: Remove this after rbs is released with tsort in its dependencies
   gem "rbs", github: "ruby/rbs" if RUBY_VERSION >= "3.2"

irb.gemspec

@@ -35,6 +35,7 @@ Gem::Specification.new do |spec|
 
   spec.required_ruby_version = Gem::Requirement.new(">= 2.7")
 
+  spec.add_dependency "prism", ">= 1.3.0"
   spec.add_dependency "reline", ">= 0.4.2"
   spec.add_dependency "rdoc", ">= 4.0.0"
   spec.add_dependency "pp", ">= 0.6.0"