Good bye urfave/cli

go.mod

@@ -3,6 +3,7 @@ module github.com/otiai10/opengraph/v2
 require (
 	github.com/otiai10/marmoset v0.4.0
 	github.com/otiai10/mint v1.3.2
-	github.com/urfave/cli v1.22.1
 	golang.org/x/net v0.0.0-20200923182212-328152dc79b1
 )
+
+go 1.13

go.sum

@@ -1,6 +1,3 @@
-github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d h1:U+s90UTSYgptZMwQh2aRr3LuazLJIa+Pg3Kc1ylSYVY=
-github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
 github.com/otiai10/curr v0.0.0-20150429015615-9b4961190c95 h1:+OLn68pqasWca0z5ryit9KGfp3sUsW4Lqg32iRMJyzs=
 github.com/otiai10/curr v0.0.0-20150429015615-9b4961190c95/go.mod h1:9qAhocn7zKJG+0mI8eUu6xqkFDYS2kb2saOteoSB3cE=
 github.com/otiai10/curr v1.0.0 h1:TJIWdbX0B+kpNagQrjgq8bCMrbhiuX73M2XwgtDMoOI=
@@ -11,14 +8,6 @@ github.com/otiai10/mint v1.3.0 h1:Ady6MKVezQwHBkGzLFbrsywyp09Ah7rkmfjV3Bcr5uc=
 github.com/otiai10/mint v1.3.0/go.mod h1:F5AjcsTsWUqX+Na9fpHb52P8pcRX2CI6A3ctIT91xUo=
 github.com/otiai10/mint v1.3.2 h1:VYWnrP5fXmz1MXvjuUvcBrXSjGE6xjON+axB/UrpO3E=
 github.com/otiai10/mint v1.3.2/go.mod h1:/yxELlJQ0ufhjUwhshSj+wFjZ78CnZ48/1wtmBH1OTc=
-github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
-github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/russross/blackfriday/v2 v2.0.1 h1:lPqVAte+HuHNfhJ/0LC98ESWRz8afy9tM/0RK8m9o+Q=
-github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
-github.com/shurcooL/sanitized_anchor_name v1.0.0 h1:PdmoCO6wvbs+7yrJyMORt4/BmY5IYyJwS/kOiWx8mHo=
-github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
-github.com/urfave/cli v1.22.1 h1:+mkCCcOFKPnCmVYVcURKps1Xe+3zP90gSYGNfRkjoIY=
-github.com/urfave/cli v1.22.1/go.mod h1:Gos4lmkARVdJ6EkW0WaNv/tZAAMe9V7XWyB60NtXRu0=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
@@ -28,5 +17,3 @@ golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5h
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

ogp/main.go

@@ -2,55 +2,52 @@ package main
 
 import (
 	"encoding/json"
+	"flag"
 	"fmt"
 	"net/url"
 	"os"
 
 	"github.com/otiai10/opengraph/v2"
-	"github.com/urfave/cli"
 )
 
 func main() {
-	app := cli.NewApp()
-	app.Version = "2.0.0"
-	app.Usage = "Fetch URL and extract OpenGraph meta informations."
-	app.UsageText = "ogp [-A] {URL}"
-	app.Flags = []cli.Flag{
-		cli.BoolFlag{
-			Name:  "absolute,A",
-			Usage: "populate relative URLs to absolute URLs",
-		},
-	}
-	app.Action = func(ctx *cli.Context) error {
-		rawurl := ctx.Args().First()
-		if rawurl == "" {
-			return fmt.Errorf("URL must be specified")
-		}
-		u, err := url.Parse(rawurl)
-		if err != nil {
-			return err
-		}
-		if u.Scheme == "" {
-			u.Scheme = "https"
-		}
-		og := opengraph.New(u.String())
-		if err := og.Fetch(); err != nil {
-			return err
-		}
-		if ctx.Bool("absolute") {
-			if err := og.ToAbs(); err != nil {
-				return err
-			}
-		}
-		b, err := json.MarshalIndent(og, "", "\t")
-		if err != nil {
-			return err
-		}
-		fmt.Printf("%+v\n", string(b))
-		return nil
+	flagset := flag.CommandLine
+	flagset.Usage = func() {
+		fmt.Println("Fetch URL and extract OpenGraph meta informations.")
 	}
-	if err := app.Run(os.Args); err != nil {
+	abs := flagset.Bool("A", false, "populate relative URLs to absolute URLs")
+	flagset.Parse(os.Args[1:])
+	if err := run(flagset.Args(), *abs); err != nil {
 		fmt.Println("Error:", err.Error())
 		os.Exit(1)
 	}
 }
+
+func run(args []string, absolute bool) error {
+	if len(args) == 0 {
+		return fmt.Errorf("URL must be specified")
+	}
+	rawurl := args[0]
+	u, err := url.Parse(rawurl)
+	if err != nil {
+		return err
+	}
+	if u.Scheme == "" {
+		u.Scheme = "https"
+	}
+	og := opengraph.New(u.String())
+	if err := og.Fetch(); err != nil {
+		return err
+	}
+	if absolute {
+		if err := og.ToAbs(); err != nil {
+			return err
+		}
+	}
+	b, err := json.MarshalIndent(og, "", "\t")
+	if err != nil {
+		return err
+	}
+	fmt.Printf("%+v\n", string(b))
+	return nil
+}