go-coreutils/uniq/main.go

package main

import (
  "fmt"
  "os"
  "bufio"
  "strings"
  "flag"
)

type Opts struct {
  IgnoreCase bool
  Count bool
}

func ParseOpts() Opts {
  var opts Opts

  flag.BoolVar(&opts.IgnoreCase, "i", false, "ignore case")
  flag.BoolVar(&opts.Count, "c", false, "count occurence")
  flag.Parse()

  return opts
}

func StringEqual(a string, b string, ignore_case bool) bool {
  if ignore_case {
    a = strings.ToLower(a)
    b = strings.ToLower(b)
  }

  return strings.Compare(a, b) == 0
}

func main() {
  scan := bufio.NewScanner(os.Stdin)
  seen_line := ""
  seen_count := 0
  opts := ParseOpts()

  for scan.Scan() {
    line := scan.Text()

    if !StringEqual(line, seen_line, opts.IgnoreCase) {
      if opts.Count {
        fmt.Print(seen_count, " ")
      }

      fmt.Println(line)

      seen_line = line
      seen_count = 0
    } else {
      seen_count++
    }
  }
}