feat: support logger opts to merge

Signed-off-by: peefy <[email protected]>

kclvm.go

@@ -31,6 +31,8 @@ KCL Go SDK
 package kclvm
 
 import (
+	"io"
+
 	"kcl-lang.io/kcl-go/pkg/kcl"
 	"kcl-lang.io/kcl-go/pkg/kclvm_runtime"
 	"kcl-lang.io/kcl-go/pkg/tools/format"
@@ -122,6 +124,11 @@ func WithSortKeys(sortKeys bool) Option {
 	return kcl.WithSortKeys(sortKeys)
 }
 
+// WithLogger returns a Option which hold a logger.
+func WithLogger(l io.Writer) Option {
+	return kcl.WithLogger(l)
+}
+
 // FormatCode returns the formatted code.
 func FormatCode(code interface{}) ([]byte, error) {
 	return format.FormatCode(code)

kclvm_test.go

@@ -3,6 +3,7 @@
 package kclvm_test
 
 import (
+	"bytes"
 	"flag"
 	"os"
 	"path/filepath"
@@ -489,3 +490,17 @@ func TestWithExternalpkg(t *testing.T) {
 	assert2.Equal(t, "[{\"a\": \"Hello External_1 World!\", \"b\": \"Hello External_2 World!\"}]", result.GetRawJsonResult())
 	assert2.Equal(t, "a: Hello External_1 World!\nb: Hello External_2 World!", result.GetRawYamlResult())
 }
+
+func TestWithLogger(t *testing.T) {
+	file, err := filepath.Abs("./testdata/test_print/main.k")
+	if err != nil {
+		t.Fatal(err)
+	}
+	var buf bytes.Buffer
+	result, err := kcl.Run(file, kcl.WithLogger(&buf))
+	if err != nil {
+		t.Fatal(err)
+	}
+	assert2.Equal(t, "hello: world", result.GetRawYamlResult())
+	assert2.Equal(t, "Hello world\n", buf.String())
+}

pkg/kcl/opt.go

@@ -279,7 +279,9 @@ func (p *Option) Merge(opts ...Option) *Option {
 		if opt.ExternalPkgs != nil {
 			p.ExternalPkgs = append(p.ExternalPkgs, opt.ExternalPkgs...)
 		}
-		p.logger = opt.logger
+		if opt.logger != nil {
+			p.logger = opt.logger
+		}
 	}
 	return p
 }

testdata/test_print/kcl.mod

@@ -0,0 +1,3 @@
+[package]
+name = "test_print"
+

testdata/test_print/main.k

@@ -0,0 +1,2 @@
+hello = "world"
+print("Hello world")