all: remove github.com/pkg/errors dependency

The github.com/pkg/errors package has been deprecated.

Signed-off-by: Koichi Shiraishi <zchee.io@gmail.com>

block_conv.go

@@ -2,9 +2,8 @@ package slack
 
 import (
 	"encoding/json"
+	"errors"
 	"fmt"
-
-	"github.com/pkg/errors"
 )
 
 type sumtype struct {

go.mod

@@ -1,12 +1,11 @@
 module github.com/slack-go/slack
 
+go 1.16
+
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/go-test/deep v1.0.4
 	github.com/gorilla/websocket v1.4.2
-	github.com/pkg/errors v0.8.0
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/stretchr/testify v1.2.2
 )
-
-go 1.16

go.sum

@@ -4,8 +4,6 @@ github.com/go-test/deep v1.0.4 h1:u2CU3YKy9I2pmu9pX0eq50wCgjfGIt539SqR7FbHiho=
 github.com/go-test/deep v1.0.4/go.mod h1:wGDj63lr65AM2AQyKZd/NYHGb0R+1RLqB8NKt3aSFNA=
 github.com/gorilla/websocket v1.4.2 h1:+/TMaTYc4QFitKJxsQ7Yye35DkWvkdLcvGKqM+x0Ufc=
 github.com/gorilla/websocket v1.4.2/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
-github.com/pkg/errors v0.8.0 h1:WdK/asTD0HN+q6hsWO3/vpuAkAr+tw6aNJNDFFf0+qw=
-github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 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/stretchr/testify v1.2.2 h1:bSDNvY7ZPG5RlJ8otE/7V6gMiyenm9RtJ7IUVIAoJ1w=

socketmode/socketmode_test.go

@@ -3,12 +3,11 @@ package socketmode
 import (
 	"bytes"
 	"encoding/json"
+	"errors"
 	"reflect"
 	"testing"
 
 	"github.com/slack-go/slack/slackevents"
-
-	"github.com/pkg/errors"
 )
 
 const (

webhooks_go112.go

@@ -6,27 +6,26 @@ import (
 	"bytes"
 	"context"
 	"encoding/json"
+	"fmt"
 	"net/http"
-
-	"github.com/pkg/errors"
 )
 
 func PostWebhookCustomHTTPContext(ctx context.Context, url string, httpClient *http.Client, msg *WebhookMessage) error {
 	raw, err := json.Marshal(msg)
 	if err != nil {
-		return errors.Wrap(err, "marshal failed")
+		return fmt.Errorf("marshal failed: %v", err)
 	}
 
 	req, err := http.NewRequest(http.MethodPost, url, bytes.NewReader(raw))
 	if err != nil {
-		return errors.Wrap(err, "failed new request")
+		return fmt.Errorf("failed new request: %v", err)
 	}
 	req = req.WithContext(ctx)
 	req.Header.Set("Content-Type", "application/json")
 
 	resp, err := httpClient.Do(req)
 	if err != nil {
-		return errors.Wrap(err, "failed to post webhook")
+		return fmt.Errorf("failed to post webhook: %v", err)
 	}
 	defer resp.Body.Close()
 

webhooks_go113.go

@@ -6,26 +6,25 @@ import (
 	"bytes"
 	"context"
 	"encoding/json"
+	"fmt"
 	"net/http"
-
-	"github.com/pkg/errors"
 )
 
 func PostWebhookCustomHTTPContext(ctx context.Context, url string, httpClient *http.Client, msg *WebhookMessage) error {
 	raw, err := json.Marshal(msg)
 	if err != nil {
-		return errors.Wrap(err, "marshal failed")
+		return fmt.Errorf("marshal failed: %w", err)
 	}
 
 	req, err := http.NewRequestWithContext(ctx, http.MethodPost, url, bytes.NewReader(raw))
 	if err != nil {
-		return errors.Wrap(err, "failed new request")
+		return fmt.Errorf("failed new request: %w", err)
 	}
 	req.Header.Set("Content-Type", "application/json")
 
 	resp, err := httpClient.Do(req)
 	if err != nil {
-		return errors.Wrap(err, "failed to post webhook")
+		return fmt.Errorf("failed to post webhook: %w", err)
 	}
 	defer resp.Body.Close()