zsh's extended history file parser

main.go

package main

import (
	"bufio"
	"fmt"
	"log"
	"os"
	"strconv"
	"strings"
	"time"
)

type History struct {
	At      time.Time
	Elapsed int
	Command string
}

func main() {
	s := bufio.NewScanner(os.Stdin)

	var histories []History
	var command string

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

		runedCommand := []rune(command)
		if []rune(runedCommand)[len(runedCommand)-1] == '\\' {
			command = strings.Join([]string{command, line}, "\n")
			continue
		} else {
			if command != "" {
				history := parseOne(command)
				histories = append(histories, history)
			}
			command = line
		}
	}

	if command != "" {
		history := parseOne(command)
		histories = append(histories, history)
	}

	fmt.Println(histories)
}

func parseOne(row string) History {
	// `: <beginning time>:<elapsed seconds>;<command>'.
	t := strings.Split(row, ";")[0:2]

	info, command := t[0], t[1]

	t = strings.Split(info, ":")
	atInt, err := strconv.Atoi(strings.TrimLeft(t[1], " "))
	if err != nil {
		log.Fatal(err)
	}
	at := time.Unix(int64(atInt), 0)

	elapsed, err := strconv.Atoi(t[2])
	if err != nil {
		log.Fatal(err)
	}

	return History{
		At:      at,
		Elapsed: elapsed,
		Command: command,
	}
}