Swift script to convert Reminders export files (.ics) to lists.

lists.swift

#!/usr/bin/swift sh

import Foundation

guard let path = CommandLine.arguments.dropFirst().first else { exit(1) }

print(path)

let content = try! String(contentsOfFile: path)
let lines = content
    .split(separator: "\r\n")

let summaryPrefix = "SUMMARY:"
let extraPrefix = "X-APPLE-ACTIVITY;VALUE="

var items = [String]()
for line in lines {
    if line.starts(with: summaryPrefix) {
        items.append(String(line.dropFirst(summaryPrefix.count)))
    }
    if line.starts(with: extraPrefix) {
        items[items.count-1].append(" \(line.dropFirst(extraPrefix.count))")
    }
}

print("Found \(items.count) items.")
print(items.joined(separator: "\n"))