Scarriffle
dccf8671b2
git-subtree-dir: CalendarrKit git-subtree-mainline:8bc32faa7fgit-subtree-split:9ea1a8705d
31 lines
1.4 KiB
Swift
31 lines
1.4 KiB
Swift
import Foundation
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/// Stable identifier for one calendar, used to tie a snapshot event back to the
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/// calendar it came from.
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///
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/// This exists because the server reports `calendar_id` inconsistently: a raw
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/// numeric for CalDAV sources, but `"<source>-<id>"` for local, iCal, Google and
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/// Home Assistant (e.g. `"local-3"`). Any consumer that filters by calendar has
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/// to normalise the two forms identically, or filtering silently does nothing
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/// for the prefixed sources — which is exactly the bug this rule was written to
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/// fix. Keeping the rule in one shared place is why it lives here rather than
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/// being reimplemented per app.
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public enum CalendarKey {
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/// Build a key, stripping a redundant `"<source>-"` prefix from the id.
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public static func make(source: String, calendarId: String) -> String {
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var id = calendarId
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let prefix = "\(source)-"
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if id.hasPrefix(prefix) { id = String(id.dropFirst(prefix.count)) }
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return "\(source):\(id)"
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}
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/// Split a key back into its source and numeric id.
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/// Returns nil for malformed keys or non-numeric ids.
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public static func parse(_ key: String) -> (source: String, id: Int)? {
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guard let colon = key.firstIndex(of: ":") else { return nil }
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let source = String(key[..<colon])
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guard let id = Int(key[key.index(after: colon)...]) else { return nil }
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return (source, id)
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}
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}
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