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Projects/kompose/preview-timezone.py

@@ -0,0 +1,78 @@
+#!/usr/bin/env python3
+"""
+Preview timezone changes for a single compose file before applying to all.
+This helps you verify the changes are correct before running the full script.
+"""
+
+import sys
+import re
+
+def preview_timezone_addition(filepath):
+    """Preview what changes would be made to a compose file."""
+    
+    try:
+        with open(filepath, 'r') as f:
+            content = f.read()
+    except FileNotFoundError:
+        print(f"Error: File not found: {filepath}")
+        return
+    
+    lines = content.split('\n')
+    modified_lines = []
+    i = 0
+    changes = []
+    
+    while i < len(lines):
+        line = lines[i]
+        modified_lines.append(line)
+        
+        # Check if this line starts an environment section
+        if re.match(r'^    environment:\s*$', line):
+            # Found an environment section
+            service_name = None
+            # Look backward to find the service name
+            for j in range(i-1, -1, -1):
+                if re.match(r'^  [a-zA-Z0-9_-]+:', lines[j]):
+                    service_name = lines[j].strip().rstrip(':')
+                    break
+            
+            # Add TZ as the first environment variable
+            tz_line = '      TZ: ${TIMEZONE:-Europe/Amsterdam}'
+            modified_lines.append(tz_line)
+            changes.append(f"  Added TZ to service '{service_name}' at line {i+2}")
+        
+        i += 1
+    
+    print("=" * 60)
+    print(f"PREVIEW: {filepath}")
+    print("=" * 60)
+    print()
+    
+    if not changes:
+        print("No changes needed - file may already have TZ configured")
+        print("or has no environment sections.")
+    else:
+        print("Changes that would be made:")
+        print()
+        for change in changes:
+            print(f"  ✓ {change}")
+        print()
+        print("-" * 60)
+        print("Modified content:")
+        print("-" * 60)
+        print('\n'.join(modified_lines))
+
+def main():
+    if len(sys.argv) < 2:
+        print("Usage: python3 preview-timezone.py <path-to-compose.yaml>")
+        print()
+        print("Example:")
+        print("  python3 preview-timezone.py auth/compose.yaml")
+        print("  python3 preview-timezone.py data/compose.yaml")
+        sys.exit(1)
+    
+    filepath = sys.argv[1]
+    preview_timezone_addition(filepath)
+
+if __name__ == '__main__':
+    main()