maksarsanjeev
34 lines
1.4 KiB
Swift
34 lines
1.4 KiB
Swift
import Foundation
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/// First name of the macOS account holder, or nil when the account name is not something
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/// you would greet someone by. "Théodore Riant" gives "Théodore"; a login handle like
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/// "theodoreriant" or "t.riant2" gives nil, because "Hey theodoreriant!" reads worse than
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/// a greeting with no name at all.
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func resolveUserFirstName() -> String? {
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let fullName = NSFullUserName().trimmingCharacters(in: .whitespacesAndNewlines)
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guard !fullName.isEmpty, fullName.count <= maxUserFullNameLength else { return nil }
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guard !looksLikeLoginHandle(fullName) else { return nil }
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guard let first = fullName.split(separator: " ").first.map(String.init),
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!first.isEmpty,
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first.allSatisfy(isNamePart) else { return nil }
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return first
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}
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/// NSFullUserName() falls back to the short account name when the full name is unset, so a
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/// single lowercase word, or one carrying digits or separators, is treated as a handle.
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private func looksLikeLoginHandle(_ name: String) -> Bool {
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guard !name.contains(" ") else { return false }
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return name == name.lowercased() || name.contains(where: isHandleMarker)
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}
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private func isHandleMarker(_ character: Character) -> Bool {
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character.isNumber || "._-@".contains(character)
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}
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private func isNamePart(_ character: Character) -> Bool {
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character.isLetter || character == "'" || character == "-"
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}
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private let maxUserFullNameLength = 32
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