1.19 prep (#741)

* Fixes to concept tree

* Crystal 1.19 prep

* Use new git checkout

* Add support for testing parallism

* Update to use the latest windows version for testing

* Fix to use the correct version in readme

Author: meatball133

.github/workflows/doc-generator.yml

@@ -14,7 +14,7 @@ jobs:
       - name: Install Crystal
         uses: crystal-lang/install-crystal@56684e85b94c6340f5035965d57dcfdedd1ab0de
         with:
-          crystal: "1.15.1"
+          crystal: "1.19.1"
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
       - name: Run generator tests
         run: crystal spec ./document-generator/spec/*
@@ -26,7 +26,7 @@ jobs:
       - name: Install Crystal
         uses: crystal-lang/install-crystal@56684e85b94c6340f5035965d57dcfdedd1ab0de
         with:
-          crystal: "1.15.1"
+          crystal: "1.19.1"
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
       - name: Run generator tests
         run: crystal document-generator/scripts/check_docs.cr

.github/workflows/tests.yml

@@ -13,7 +13,7 @@ jobs:
     name: Test Generator
     runs-on: ubuntu-24.04
     container:
-      image: crystallang/crystal:1.17
+      image: crystallang/crystal:1.19.1
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
       - name: Run generator tests
@@ -22,7 +22,7 @@ jobs:
     name: Check Generator Templates
     runs-on: ubuntu-24.04
     container:
-      image: crystallang/crystal:1.17
+      image: crystallang/crystal:1.19.1
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
       - name: Check generator templates tests
@@ -31,7 +31,7 @@ jobs:
     name: Check file formatting
     runs-on: ubuntu-24.04
     container:
-      image: crystallang/crystal:1.17
+      image: crystallang/crystal:1.19.1
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
       - name: Run file formatting
@@ -42,7 +42,7 @@ jobs:
     strategy:
       # Allows running the job multiple times with different configurations
       matrix:
-        crystal: ["1.11", "1.12", "1.13", "1.14", "1.15.1"]
+        crystal: ["1.15", "1.16", "1.17", "1.18", "1.19.1"]
     container:
       image: crystallang/crystal:${{ matrix.crystal }}
     steps:
@@ -53,12 +53,12 @@ jobs:
         run: ./bin/test-exercises.sh
   exercises-windows:
     name: Check exercises Crystal on Windows
-    runs-on: windows-2022
+    runs-on: windows-2025
     steps:
       - name: Install Crystal
         uses: crystal-lang/install-crystal@56684e85b94c6340f5035965d57dcfdedd1ab0de
         with:
-          crystal: "1.15.1"
+          crystal: "1.19.1"
       - name: 'Setup jq'
         run: choco install jq
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd

README.md

@@ -4,7 +4,7 @@
 <p vertical-align="middle"><h1>Exercism Crystal Track</h1></p>
 
 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[![Discourse topics](https://img.shields.io/discourse/topics?color=8A08E6&label=Connect%20&labelColor=FFDF58&logo=Discourse&logoColor=8A08E6&server=https%3A%2F%2Fforum.exercism.org&style=social)](https://forum.exercism.org)
-&nbsp;[![Exercism_II](https://img.shields.io/badge/Exercism--Built-9101FF?logo=crystal&logoColor=000000&labelColor=E5E5E5&label=Crystal%201.15.1%20Powered)](https://exercism.org)
+&nbsp;[![Exercism_II](https://img.shields.io/badge/Exercism--Built-9101FF?logo=crystal&logoColor=000000&labelColor=E5E5E5&label=Crystal%201.19.1%20Powered)](https://exercism.org)
 &nbsp;[![Exercism_III](https://img.shields.io/badge/Open-11b30e?labelColor=3D454D&label=Contributions)](https://exercism.org/blog/freeing-our-maintainers) &nbsp;[![Build Status](https://github.com/exercism/crystal/workflows/Tests/badge.svg)](https://github.com/exercism/crystal/actions/workflows/tests.yml)
 
 <br>
@@ -16,7 +16,7 @@ Hi. &nbsp;👋🏽 &nbsp;👋 &nbsp;**We are happy you are here.**&nbsp; 🎉&nb
 **`exercism/Crystal`** is one of many programming language tracks on [exercism(dot)org][exercism-website].
 This repo holds all the instructions, tests, code, & support files for Crystal _exercises_ currently under development or implemented & available for students.
 
-🌟 &nbsp;&nbsp;Track tooling (_test-runner, representer, analyzer, and Continuous Integration_) runs on Crystal `1.15.1`. <br>
+🌟 &nbsp;&nbsp;Track tooling (_test-runner, representer, analyzer, and Continuous Integration_) runs on Crystal `1.19.1`. <br>
 🌟 &nbsp;&nbsp;Most exercises are solvable with Crystal `1.0.0` or higher.
 
 This track is made up of **Practice Exercises**. Practice exercises are open-ended, and can be used to practice concepts learned, try out new techniques, and play.
@@ -64,7 +64,7 @@ Please keep in mind [Chesterton's Fence][chestertons-fence].
 
 ## Crystal Software and Documentation
 
-**Copyright © 2012-2024 Manas Technology Solutions. All rights reserved.**
+**Copyright © 2012-2026 Manas Technology Solutions. All rights reserved.**
 
 Crystal software and documentation are licensed under the [Apache License v2.0][crystal-license].
 

bin/test-exercises.sh

@@ -10,11 +10,22 @@ test_run() {
     spec_file="$1/$(jq -r '.files.test[0]' $1/.meta/config.json)"
     cat "${spec_file}" > "${dic}/spec/spec.cr"
     sed -i -e 's/pending/it/g' ${dic}/spec/spec.cr
-    crystal spec ${dic}/spec/spec.cr || exit 1
+    crystal spec ${dic}/spec/spec.cr $3 || exit 1
+}
+
+crystal_version_at_least() {
+    required_version="$1"
+    current_version="$(crystal -v | head -n1 | awk '{print $2}' | sed 's/[^0-9.].*$//')"
+
+    [ "$(printf '%s\n%s\n' "${required_version}" "${current_version}" | sort -V | head -n1)" = "${required_version}" ]
 }
 
 for exercise in ./exercises/practice/*; do
-    test_run ${exercise} "example"
+    if [ "$(basename "${exercise}")" != "parallel-letter-frequency" ]; then
+        test_run ${exercise} "example"
+    elif crystal_version_at_least "1.19.0"; then
+        test_run ${exercise} "example" "-D preview_mt"
+    fi
 done
 
 if [ -d "./exercises/concept" ]; then