refactor: deduplicate yaml import pattern via require_yaml()

scripts/auto_fetch.py

@@ -26,13 +26,9 @@ import urllib.error
 from pathlib import Path
 
 sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
-from common import list_registered_platforms, load_database, load_platform_config
+from common import list_registered_platforms, load_database, load_platform_config, require_yaml
 
-try:
-    import yaml
-except ImportError:
-    print("Error: PyYAML required (pip install pyyaml)", file=sys.stderr)
-    sys.exit(1)
+yaml = require_yaml()
 
 DEFAULT_DB = "database.json"
 DEFAULT_PLATFORMS_DIR = "platforms"

scripts/common.py

@@ -21,6 +21,17 @@ except ImportError:
     yaml = None
 
 
+def require_yaml():
+    """Import and return yaml, exiting if PyYAML is not installed."""
+    try:
+        import yaml as _yaml
+        return _yaml
+    except ImportError:
+        import sys
+        print("Error: PyYAML required (pip install pyyaml)", file=sys.stderr)
+        sys.exit(1)
+
+
 def compute_hashes(filepath: str | Path) -> dict[str, str]:
     """Compute SHA1, MD5, SHA256, CRC32, Adler32 for a file."""
     sha1 = hashlib.sha1()

scripts/cross_reference.py

@@ -18,14 +18,10 @@ import os
 import sys
 from pathlib import Path
 
-try:
-    import yaml
-except ImportError:
-    print("Error: PyYAML required (pip install pyyaml)", file=sys.stderr)
-    sys.exit(1)
-
 sys.path.insert(0, os.path.dirname(__file__))
-from common import list_registered_platforms, load_database, load_emulator_profiles, load_platform_config
+from common import list_registered_platforms, load_database, load_emulator_profiles, load_platform_config, require_yaml
+
+yaml = require_yaml()
 
 DEFAULT_EMULATORS_DIR = "emulators"
 DEFAULT_PLATFORMS_DIR = "platforms"

scripts/diff_truth.py

@@ -16,14 +16,10 @@ import os
 import sys
 
 sys.path.insert(0, os.path.dirname(__file__))
-from common import list_registered_platforms, load_platform_config
+from common import list_registered_platforms, load_platform_config, require_yaml
 from truth import diff_platform_truth
 
-try:
-    import yaml
-except ImportError:
-    print("Error: PyYAML required (pip install pyyaml)", file=sys.stderr)
-    sys.exit(1)
+yaml = require_yaml()
 
 
 def _load_truth(truth_dir: str, platform: str) -> dict | None:

scripts/generate_pack.py

@@ -32,18 +32,14 @@ from common import (
     list_platform_system_ids, list_registered_platforms,
     filter_systems_by_target, list_system_ids, load_database,
     load_data_dir_registry, load_emulator_profiles, load_platform_config,
-    md5_composite, resolve_local_file,
+    md5_composite, require_yaml, resolve_local_file,
 )
 from validation import (
     _build_validation_index, check_file_validation, filter_files_by_mode,
 )
 from deterministic_zip import rebuild_zip_deterministic
 
-try:
-    import yaml
-except ImportError:
-    print("Error: PyYAML required (pip install pyyaml)", file=sys.stderr)
-    sys.exit(1)
+yaml = require_yaml()
 
 DEFAULT_PLATFORMS_DIR = "platforms"
 DEFAULT_DB_FILE = "database.json"

scripts/generate_site.py

@@ -19,14 +19,10 @@ import sys
 from datetime import datetime, timezone
 from pathlib import Path
 
-try:
-    import yaml
-except ImportError:
-    print("Error: PyYAML required (pip install pyyaml)", file=sys.stderr)
-    sys.exit(1)
-
 sys.path.insert(0, os.path.dirname(__file__))
-from common import list_registered_platforms, load_database, load_emulator_profiles, load_platform_config
+from common import list_registered_platforms, load_database, load_emulator_profiles, load_platform_config, require_yaml
+
+yaml = require_yaml()
 from generate_readme import compute_coverage
 from verify import verify_platform
 

scripts/generate_truth.py

@@ -19,14 +19,11 @@ from common import (
     load_emulator_profiles,
     load_platform_config,
     load_target_config,
+    require_yaml,
 )
 from truth import generate_platform_truth
 
-try:
-    import yaml
-except ImportError:
-    print("Error: PyYAML required (pip install pyyaml)", file=sys.stderr)
-    sys.exit(1)
+yaml = require_yaml()
 
 DEFAULT_OUTPUT_DIR = "dist/truth"
 DEFAULT_PLATFORMS_DIR = "platforms"

scripts/verify.py

@@ -28,20 +28,16 @@ import sys
 import zipfile
 from pathlib import Path
 
-try:
-    import yaml
-except ImportError:
-    print("Error: PyYAML required (pip install pyyaml)", file=sys.stderr)
-    sys.exit(1)
-
 sys.path.insert(0, os.path.dirname(__file__))
 from common import (
     build_zip_contents_index, check_inside_zip, compute_hashes,
     filter_systems_by_target, group_identical_platforms, list_emulator_profiles,
     list_system_ids, load_data_dir_registry, load_emulator_profiles,
-    load_platform_config, md5sum, md5_composite, resolve_local_file,
+    load_platform_config, md5sum, md5_composite, require_yaml, resolve_local_file,
     resolve_platform_cores,
 )
+
+yaml = require_yaml()
 from validation import (
     _build_validation_index, _parse_validation, build_ground_truth,
     check_file_validation, filter_files_by_mode,