File: write-swift-version

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swiftlang 6.2.3-1
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#!/usr/bin/env python

import sys
import subprocess

def write_file_if_changed(path, data):
    try:
        with open(path) as f:
            old_data = f.read()
    except:
        old_data = None
    if old_data == data:
        return

    # Write the contents.
    with open(path, "w") as f:
        f.write(data)

def main():
    args = sys.argv
    if len(sys.argv) != 3:
        print("Usage: <compiler-path> <file-path>")
        raise SystemExit(1)

    file_path = args[2]
    compiler = args[1]
    data = subprocess.check_output(
        [compiler, "-version"], universal_newlines=True).strip()

    write_file_if_changed(file_path, data)

if __name__ == '__main__':
    main()