use python instead of bash for test runner

.github/run_tests.py

@@ -0,0 +1,44 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+import platform
+import subprocess
+import sys
+
+# get/sanity check chapter number
+cc = sys.argv[1]
+chapter = int(sys.argv[2])
+if chapter < 1 or chapter > 20:
+    exit("Bad chapter number")
+
+# do we need rosetta?
+prefix = ""
+if platform.machine().lower() == "arm64":
+    prefix = "arch -x86_64 "
+
+# define the stages we're going to test
+stages = ["lex", "parse", "tacky", "validate", "codegen", "run"]
+if chapter == 1:
+    # tacky and validate stages not added yet
+    stages.remove("tacky")
+    stages.remove("validate")
+elif chapter < 5:
+    # TACKY stage added, validate not
+    stages.remove("validate")
+elif chapter > 18:
+    # don't test intermediate stages for chapters 19/20
+    stages = ["run"]
+
+
+for stage in stages:
+    print(f"Testing '{stage}' stage")
+    try:
+        subprocess.run(
+            f"{prefix}./test_compiler {cc} --chapter {chapter} --stage {stage}",
+            shell=True,
+            check=True,
+        )
+    except subprocess.CalledProcessError as cpe:
+        print(cpe.stderr)
+        print(cpe.stdout)
+        exit("command failed")

.github/workflows/build_and_test.yaml

@@ -35,8 +35,9 @@ jobs:
         with:
           repository: nlsandler/nqcc2
           sparse-checkout: |
-            .github/run-tests.sh
+            .github/run_tests.py
           sparse-checkout-cone-mode: false
+          path: script
 
       - name: Download the compiler
         uses: actions/download-artifact@v4
@@ -47,14 +48,7 @@ jobs:
       # make NQCC executable
       - run: chmod u+x nqcc/main.exe
 
-      # Invoke the run-tests script to test each intermediate stage
-
-      # use Rosetta on macOS since that's what most readers are doing
-      - name: Run the tests (Apple Silicon)
-        if: runner.arch == 'ARM64'
-        run: arch -x86_64 ./.github/run-tests.sh
-
-      - name: Run the tests (x86-64)
-        if: runner.arch != 'ARM64'
-        run: ./.github/run-tests.sh
+      # Invoke the run_tests.py script to test each intermediate stage
+      - name: Run the tests
+        run: ./script/.github/run_tests.py nqcc/main.exe "{$CHAPTER}"