resolves #33 pkg/replace errors by fmt (stdlib)

go.mod

@@ -3,7 +3,6 @@ module github.com/yuzutech/kroki-cli
 go 1.18
 
 require (
-	github.com/pkg/errors v0.9.1
 	github.com/spf13/cobra v1.6.0
 	github.com/spf13/viper v1.13.0
 	github.com/yuzutech/kroki-go v0.8.1
@@ -17,6 +16,7 @@ require (
 	github.com/mitchellh/mapstructure v1.5.0 // indirect
 	github.com/pelletier/go-toml v1.9.5 // indirect
 	github.com/pelletier/go-toml/v2 v2.0.5 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
 	github.com/spf13/afero v1.8.2 // indirect
 	github.com/spf13/cast v1.5.0 // indirect
 	github.com/spf13/jwalterweatherman v1.1.0 // indirect

pkg/convert.go

@@ -9,7 +9,6 @@ import (
 	"path/filepath"
 	"strings"
 
-	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
 	"github.com/yuzutech/kroki-go"
@@ -164,9 +163,7 @@ func ImageFormatFromValue(imageFormatRaw string) (kroki.ImageFormat, error) {
 	if f, ok := getImageFormatExtensions()["."+value]; ok {
 		return f, nil
 	}
-	return "", errors.Errorf(
-		"invalid image format %s.",
-		value)
+	return "", fmt.Errorf("invalid image format: %s", value)
 }
 
 func ImageFormatFromFile(filePath string) (kroki.ImageFormat, error) {
@@ -175,9 +172,7 @@ func ImageFormatFromFile(filePath string) (kroki.ImageFormat, error) {
 	if f, ok := getImageFormatExtensions()[value]; ok {
 		return f, nil
 	}
-	return "", errors.Errorf(
-		"invalid image format %s.",
-		value)
+	return "", fmt.Errorf("invalid image format: %s", value)
 }
 
 func ResolveGraphFormat(graphFormatRaw string, filePath string) (kroki.DiagramType, error) {
@@ -203,8 +198,8 @@ func GraphFormatFromFile(filePath string) (kroki.DiagramType, error) {
 	if d, ok := getDiagramTypeExtensions()[fileExtension]; ok {
 		return d, nil
 	}
-	return "", errors.Errorf(
-		"unable to infer the graph format from the file extension %s, please specify the diagram type using --type flag.",
+	return "", fmt.Errorf(
+		"unable to infer the graph format from the file extension %s, please specify the diagram type using --type flag",
 		value)
 }
 

pkg/decode.go

@@ -12,7 +12,6 @@ import (
 	"path"
 	"strings"
 
-	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 )
 
@@ -59,11 +58,11 @@ func DecodeInput(input string) (string, error) {
 	}
 	result, err := base64.URLEncoding.DecodeString(input)
 	if err != nil {
-		return "", errors.Wrap(err, "fail to decode the input")
+		return "", fmt.Errorf("fail to decode the input: %w", err)
 	}
 	reader, err := zlib.NewReader(bytes.NewReader(result))
 	if err != nil {
-		return "", errors.Wrap(err, "fail to create the reader")
+		return "", fmt.Errorf("fail to create the reader: %w", err)
 	}
 	out := new(strings.Builder)
 	_, _ = io.Copy(out, reader)
@@ -78,7 +77,7 @@ func getUrl(input string) (*url.URL, error) {
 
 	u, err := url.Parse(input)
 	if err != nil || u.Scheme == "" || u.Host == "" {
-		return u, errors.New("invalid URL")
+		return u, fmt.Errorf("invalid URL")
 	}
 
 	return u, nil

pkg/encode.go

@@ -4,10 +4,8 @@ import (
 	"bufio"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 
-	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"github.com/yuzutech/kroki-go"
 )
@@ -35,9 +33,9 @@ func EncodeFromReader(reader io.Reader) {
 }
 
 func EncodeFromFile(filePath string) {
-	content, err := ioutil.ReadFile(filePath)
+	content, err := os.ReadFile(filePath)
 	if err != nil {
-		exit(errors.Wrapf(err, "fail to read file '%s'", filePath))
+		exit(fmt.Errorf("fail to read file %s: %w", filePath, err))
 	}
 	input := string(content)
 	result, err := kroki.CreatePayload(input)