hipa/main.go

package main

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

// map for old history records
var history = make(map[string]int)

// file 'h': ${HOME}/.bash_history
// file 't': /tmp/.bash_history******/.bash_history
var h, t file

// Set constant file name
// Why constant? Because it will never be changed due to program purpose.
const fileName string = ".bash_history"

func init() {
	h.init(fileName, locHome)
	h.Open()

	t.init(fileName, locTemp)
	t.Open()
}

func main() {
	//read old history
	scanner := bufio.NewScanner(h.handle)
	var i = 0
	for scanner.Scan() {
		line := strings.TrimSpace(scanner.Text())
		history[line] = i
		i++
	}
	delete(history, "")
	h.handle.Close()

	// push history to temp slice
	// and sort by last entry position number
	var ah = make([]string, i)
	for key, val := range history {
		ah[val] = key
	}

	// write not empty lines to temp file
	i = 0
	for _, key := range ah {
		if len(key) > 0 {
			t.handle.WriteString(key + "\n")
			i++
		}
	}
	t.handle.Close()

	//copy from temp file to home
	_, err := CopyFile(t.path, h.path)
	if err != nil {
		fmt.Println(err)
	}

	//finnaly remove temp folder
	err = os.RemoveAll(t.dir)
	if err != nil {
		fmt.Print(err)
	}
	fmt.Printf("wrote %d lines to %s\n", i, h.path)
}