fix: changelog is too long (#2661)

Signed-off-by: Engin Diri <engin.diri@mail.schwarz>

internal/client/client.go

@@ -12,6 +12,13 @@ import (
 	"github.com/goreleaser/goreleaser/pkg/context"
 )
 
+const (
+	// maxReleaseBodyLength defines the max characters size of the body
+	maxReleaseBodyLength = 125000
+	// ellipsis to be used when release notes body is too long
+	ellipsis = "..."
+)
+
 // ErrNotImplemented is returned when a client does not implement certain feature.
 var ErrNotImplemented = fmt.Errorf("not implemented")
 
@@ -83,6 +90,13 @@ func NewIfToken(ctx *context.Context, cli Client, token string) (Client, error)
 	return newWithToken(ctx, token)
 }
 
+func truncateReleaseBody(body string) string {
+	if len(body) > maxReleaseBodyLength {
+		body = body[1:(maxReleaseBodyLength-len(ellipsis))] + ellipsis
+	}
+	return body
+}
+
 // ErrNoMilestoneFound is an error when no milestone is found.
 type ErrNoMilestoneFound struct {
 	Title string

internal/client/client_test.go

@@ -1,6 +1,7 @@
 package client
 
 import (
+	"math/rand"
 	"testing"
 
 	"github.com/goreleaser/goreleaser/pkg/config"
@@ -59,6 +60,18 @@ func TestClientNewGitLab(t *testing.T) {
 	require.True(t, ok)
 }
 
+func TestCheckBodyMaxLength(t *testing.T) {
+	letters := []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
+	b := make([]rune, maxReleaseBodyLength)
+	for i := range b {
+		b[i] = letters[rand.Intn(len(letters))]
+	}
+	ctx := context.New(config.Project{})
+	ctx.ReleaseNotes = string(b)
+	out := truncateReleaseBody(string(b))
+	require.Len(t, out, maxReleaseBodyLength)
+}
+
 func TestNewIfToken(t *testing.T) {
 	t.Run("valid", func(t *testing.T) {
 		ctx := &context.Context{

internal/client/github.go

@@ -207,6 +207,9 @@ func (c *githubClient) CreateRelease(ctx *context.Context, body string) (string,
 		return "", err
 	}
 
+	// Truncate the release notes if it's too long (github doesn't allow more than 125000 characters)
+	body = truncateReleaseBody(body)
+
 	data := &github.RepositoryRelease{
 		Name:       github.String(title),
 		TagName:    github.String(ctx.Git.CurrentTag),