remove ioutil

cli/cli.go

@@ -5,7 +5,6 @@ import (
 	"flag"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"os/signal"
 	"runtime"
@@ -243,7 +242,7 @@ func (c *CLI) uploadSnippet(ctx context.Context, filename, uploadFilename, filet
 	}
 	defer reader.Close()
 
-	content, err := ioutil.ReadAll(reader)
+	content, err := io.ReadAll(reader)
 	if err != nil {
 		return err
 	}

config/config.go

@@ -2,7 +2,6 @@ package config
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"time"
@@ -67,7 +66,7 @@ func (c *Config) LoadEnv() error {
 }
 
 func (c *Config) LoadTOML(filename string) error {
-	b, err := ioutil.ReadFile(filename)
+	b, err := os.ReadFile(filename)
 	if err != nil {
 		return err
 	}

slack/client.go

@@ -6,7 +6,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"log"
 	"net/http"
 	"net/url"
@@ -55,7 +54,7 @@ func NewClient(urlStr string, logger *log.Logger) (*Client, error) {
 		return nil, fmt.Errorf("failed to parse url: %s: %w", urlStr, err)
 	}
 
-	var discardLogger = log.New(ioutil.Discard, "", log.LstdFlags)
+	var discardLogger = log.New(io.Discard, "", log.LstdFlags)
 	if logger == nil {
 		logger = discardLogger
 	}
@@ -70,7 +69,7 @@ func NewClient(urlStr string, logger *log.Logger) (*Client, error) {
 }
 
 func NewClientForPostFile(logger *log.Logger) (*Client, error) {
-	var discardLogger = log.New(ioutil.Discard, "", log.LstdFlags)
+	var discardLogger = log.New(io.Discard, "", log.LstdFlags)
 	if logger == nil {
 		logger = discardLogger
 	}
@@ -116,7 +115,7 @@ func (c *Client) PostText(ctx context.Context, param *PostTextParam) error {
 	}
 
 	if res.StatusCode != http.StatusOK {
-		b, err := ioutil.ReadAll(res.Body)
+		b, err := io.ReadAll(res.Body)
 		if err != nil {
 			return fmt.Errorf("failed to read res.Body and the status code of the response from slack was not 200: %w", err)
 		}
@@ -163,7 +162,7 @@ func (c *Client) PostFile(ctx context.Context, token string, param *PostFilePara
 		return err
 	}
 
-	b, err := ioutil.ReadAll(res.Body)
+	b, err := io.ReadAll(res.Body)
 	if err != nil {
 		return err
 	}

slack/client_test.go

@@ -3,7 +3,7 @@ package slack_test
 import (
 	"context"
 	"encoding/json"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/http/httptest"
 	"net/url"
@@ -61,7 +61,7 @@ func TestPostText_Success(t *testing.T) {
 			t.Fatalf("Content-Type expected %s, but %s", expectedType, contentType)
 		}
 
-		bodyBytes, err := ioutil.ReadAll(r.Body)
+		bodyBytes, err := io.ReadAll(r.Body)
 		if err != nil {
 			t.Fatal(err)
 		}
@@ -146,7 +146,7 @@ func TestPostFile_Success(t *testing.T) {
 			t.Fatalf("Content-Type expected %s, but %s", expectedType, contentType)
 		}
 
-		bodyBytes, err := ioutil.ReadAll(r.Body)
+		bodyBytes, err := io.ReadAll(r.Body)
 		if err != nil {
 			t.Fatal(err)
 		}
@@ -205,7 +205,7 @@ func TestPostFile_Success_provideFiletype(t *testing.T) {
 			t.Fatalf("Content-Type expected %s, but %s", expectedType, contentType)
 		}
 
-		bodyBytes, err := ioutil.ReadAll(r.Body)
+		bodyBytes, err := io.ReadAll(r.Body)
 		if err != nil {
 			t.Fatal(err)
 		}