Detect Merge Conflict Markers in a File with Python

from pathlib import Path

def detect_merge_conflicts(file_path):
    conflicts = []
    with open(file_path, 'r') as f:
        lines = f.readlines()
    
    for i, line in enumerate(lines, 1):
        if line.startswith('<<<<<<<'):
            conflict_marker = 'conflict start'
            conflicts.append((i, conflict_marker, line.strip()))
        elif line.startswith('======='):
            conflict_marker = 'divider'
            conflicts.append((i, conflict_marker, line.strip()))
        elif line.startswith('>>>>>>>'):
            conflict_marker = 'conflict end'
            conflicts.append((i, conflict_marker, line.strip()))
    
    return conflicts

if __name__ == "__main__":
    import sys
    sample = """line1
<<<<<<< HEAD
my changes
=======
their changes
>>>>>>> branch-name
line5"""
    
    # Write sample to temp file (alternative: use provided path instead)
    from tempfile import NamedTemporaryFile
    with NamedTemporaryFile('w', suffix='.txt', delete=False) as tmp:
        tmp.write(sample)
        tmp_path = tmp.name
    
    conflict_lines = detect_merge_conflicts(tmp_path)
    Path(tmp_path).unlink()  # cleanup
    
    if conflict_lines:
        for line_num, marker, content in conflict_lines:
            print(f"Line {line_num}: {marker} ({content})")
    else:
        print("No merge conflicts found")