10chapters.go

package main

import (
	"flag"
	"fmt"
	"os"
	"text/template"
	"time"
)

func main() {
	var currentDay, daysAdvanced, daysSkipped int
	var dateStarted string
	var runHttpd bool

	flag.BoolVar(&runHttpd, "httpd", false, "Whether to start http server on port 8080")
	flag.StringVar(&dateStarted, "date-started", time.Now().Format("2006-01-02"),
		"The date you started reading this plan.")
	flag.IntVar(&daysAdvanced, "days-advanced", 0, "Amount of days you read in advance.")
	flag.IntVar(&daysSkipped, "days-skipped", 0, "Amount of days you skipped the reading.")
	flag.IntVar(&currentDay, "day", 1, "Current day you are reading.")
	flag.Parse()

	lists := generateLists()
	chapters := generateListChapters(lists)

	if runHttpd {
		serve(chapters)
		return
	}

	currentDay, err := decidePrintDay(currentDay,
		dateStarted, daysAdvanced, daysSkipped)
	if err != nil {
		fmt.Println("Couldn’t select a day to use, due to this error:")
		fmt.Println(err)
		return
	}

	tmpl := template.Must(template.ParseFiles("tmpl/cli.txt"))
	tmplData := prepareTmplData(currentDay, chapters)
	tmpl.Execute(os.Stdout, tmplData)
}