25 lines
753 B
Swift
25 lines
753 B
Swift
import Foundation
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var standardError = FileHandle.standardError
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extension FileHandle : TextOutputStream {
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public func write(_ string: String) {
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guard let data = string.data(using: .utf8) else { return }
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self.write(data)
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}
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}
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guard CommandLine.arguments.count > 1 else {
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print("Usage: \(CommandLine.arguments[0]) file\nUse - to read from stdin", to: &standardError)
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exit(EXIT_FAILURE)
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}
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let input: String
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if CommandLine.arguments[1] == "-" {
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input = String(decoding: FileHandle.standardInput.readDataToEndOfFile(), as: UTF8.self)
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} else {
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input = try String(contentsOf: URL(fileURLWithPath: CommandLine.arguments[1]))
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}
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let chars = Set(input.unicodeScalars)
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let out = chars.sorted().lazy.map(Character.init)
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print(String(out), terminator: "")
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