46 lines
734 B
Go
46 lines
734 B
Go
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/* Yes program implementation. */
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package uniq
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import(
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"os"
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"fmt"
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"flag"
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"bufio"
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"io"
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)
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func Run(args []string) int {
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var(
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Uflag bool
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)
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status := 0
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arg0 := args[0]
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args = args[1:]
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flagSet := flag.NewFlagSet(arg0, flag.ExitOnError)
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flagSet.BoolVar(&Uflag, "U", false, "Print every line just one time.")
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flagSet.Usage = func() {
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fmt.Fprintf(os.Stderr, "Usage of %s: %s [options] [string]\n", arg0, arg0)
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flagSet.PrintDefaults()
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}
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flagSet.Parse(args)
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args = flagSet.Args()
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r := bufio.NewReader(os.Stdin)
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u := make(map[string]int)
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if Uflag {
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for{
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l, e := r.ReadString('\n')
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if e==io.EOF {
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break
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}
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_, haskey := u[l]
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if !haskey {
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u[l] = 1
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fmt.Print(l)
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}
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}
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}
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return status
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}
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