package main

import (
	"bufio"
	"os"
	"strings"
)

var history = make(map[string]int)

func main() {
	histfile, _ := os.Open(gethistfile())
	scanner := bufio.NewScanner(histfile)
	var i = 0
	for scanner.Scan() {
		line := strings.TrimSpace(scanner.Text())
		if len(line) > 0 {
			if history[line] == 0 {
				history[line] = i
				i++
			}
		}
	}

	defer histfile.Close()

	var ah = make([]string, i)
	for key, val := range history {
		ah[val] = key
	}

	newhistfile, _ := os.OpenFile(mktmpfile(), os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0600)
	newhistfile.Truncate(0)
	for _, key := range ah {
		newhistfile.WriteString(key + "\n")
	}
	newhistfile.Sync()
	CopyFile(mktmpfile(), gethistfile())
	defer newhistfile.Close()
}