prepend_previous_n_lines_to_every_item.go

package main
import (
	"flag"
	//"fmt"

	"github.com/Des-Nerger/go-astisub"
	"github.com/asticode/go-astilog"
)

func init() {astilog.SetLogger(astilog.New(astilog.Configuration{Verbose: true}))}

func max(a, b int) int {if a > b {return a}; return b}

func main() {
	var (n int; err error; removeItemOwnLines bool)
	separatorLine := func() astisub.Line {
		flag.IntVar(&n, "n", 4, "")
		var separator string; flag.StringVar(&separator, "separator", "|", "")
		flag.BoolVar(&removeItemOwnLines, "removeItemOwnLines", false, "")
		flag.Parse()
		return astisub.Line{Items: []astisub.LineItem{{Text: separator}}}
	} ()
	panicCheck := func() {if err != nil {panic(err)}}
	subs, err := astisub.OpenFile(flag.Arg(0)); panicCheck()
	linesCount := 0; for _, item := range subs.Items {linesCount += len(item.Lines)}
	lines := make([]astisub.Line, 0, linesCount)
	for _, item := range subs.Items {
		itemLines := item.Lines
		item.Lines = append( append(lines[max(0,len(lines)-n):len(lines):len(lines)], separatorLine),
			func() []astisub.Line {if removeItemOwnLines {return nil}; return itemLines} ()...,
		)
		lines = append(lines, itemLines...)
	}
	if len(lines) != cap(lines) {panic(nil)}
	err = subs.Write(flag.Arg(1)); panicCheck()
}