Compare two GDS files using klayout scripting

gds_compare.py

# Usage:
# klayout -b -r compare.py -rd gds1=file1.gds -rd gds2=file2.gds

import sys
import pya

def compare_gds(file1, file2):
    diff = pya.LayoutDiff()

    # Load the layouts
    layout1 = pya.Layout()
    layout1.read(file1)
    
    layout2 = pya.Layout()
    layout2.read(file2)
    
    # Check if the layouts are identical
    return diff.compare(layout1, layout2)

if __name__ == "__main__":
    if compare_gds(gds1, gds2):
        print(f"{gds1} and {gds2} are identical.")
        sys.exit(0)
    else:
        print(f"{gds1} and {gds2} are different.")
        sys.exit(-1)