readability_cli.exe --url=https://www.nytimes.com/2019/02/20/climate/climate-national-security-threat.html --fin=C:\GoProjects\fin.html --fout=C:\GoProjects\fout.txt

go-readability-cli.go

package main

import (
	"fmt"
	"log"
	"os"

	readability "github.com/go-shiori/go-readability"
	"github.com/urfave/cli"
)

func main() {
	app := &cli.App{
		Flags: []cli.Flag{
			&cli.StringFlag{
				Name:  "url",
				Usage: "URL (only for statistics)",
			},
			&cli.StringFlag{
				Name:  "fin",
				Usage: "Input filepath with full http response (html without headers)",
			},
			&cli.StringFlag{
				Name:  "fout",
				Usage: "Result filepath for save article text",
			},
		},

		Action: func(c *cli.Context) error {
			url := c.String("url")
			if url == "" {
				fmt.Print("--url param is empty")
				return nil
			}

			fin := c.String("fin")
			_, err := os.Stat(fin)
			if os.IsNotExist(err) {
				fmt.Print("Input file from --fin param not exists")
				return nil
			}

			fout := c.String("fout")

			f, err := os.Open(fin)
			defer f.Close()
			if err != nil {
				panic(err)
			}

			article, err := readability.FromReader(f, url)
			if err != nil {
				panic(err)
			}

			dstTxtFile, _ := os.Create(fout)
			defer dstTxtFile.Close()
			dstTxtFile.WriteString(article.TextContent)

			fmt.Printf("SuccessReadability")
			return nil
		},
	}

	err := app.Run(os.Args)
	if err != nil {
		log.Fatal(err)
	}
}