feat: add slog support

Signed-off-by: Mark Sagi-Kazar <mark.sagikazar@gmail.com>

experimental_logger.go

@@ -1,11 +0,0 @@
-//go:build viper_logger
-// +build viper_logger
-
-package viper
-
-// WithLogger sets a custom logger.
-func WithLogger(l Logger) Option {
-	return optionFunc(func(v *Viper) {
-		v.logger = l
-	})
-}

go.mod

@@ -58,6 +58,7 @@ require (
 	github.com/nats-io/nuid v1.0.1 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
+	github.com/sagikazarmark/slog-shim v0.1.0 // indirect
 	go.etcd.io/etcd/api/v3 v3.5.9 // indirect
 	go.etcd.io/etcd/client/pkg/v3 v3.5.9 // indirect
 	go.etcd.io/etcd/client/v2 v2.305.9 // indirect
@@ -67,7 +68,7 @@ require (
 	go.uber.org/multierr v1.8.0 // indirect
 	go.uber.org/zap v1.21.0 // indirect
 	golang.org/x/crypto v0.13.0 // indirect
-	golang.org/x/exp v0.0.0-20230321023759-10a507213a29 // indirect
+	golang.org/x/exp v0.0.0-20230905200255-921286631fa9 // indirect
 	golang.org/x/net v0.14.0 // indirect
 	golang.org/x/oauth2 v0.11.0 // indirect
 	golang.org/x/sync v0.3.0 // indirect

go.sum

@@ -182,6 +182,7 @@ github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm4
 github.com/google/s2a-go v0.1.5 h1:8IYp3w9nysqv3JH+NJgXJzGbDHzLOTj43BmSkp+O7qg=
 github.com/google/s2a-go v0.1.5/go.mod h1:Ej+mSEMGRnqRzjc7VtF+jdBwYG5fuJfiZ8ELkjEwM0A=
 github.com/google/uuid v1.1.2/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/googleapis/enterprise-certificate-proxy v0.2.5 h1:UR4rDjcgpgEnqpIEvkiqTYKBCKLNmlge2eVjoZfySzM=
 github.com/googleapis/enterprise-certificate-proxy v0.2.5/go.mod h1:RxW0N9901Cko1VOCW3SXCpWP+mlIEkk2tP7jnHy9a3w=
 github.com/googleapis/gax-go/v2 v2.0.4/go.mod h1:0Wqv26UfaUD9n4G6kQubkQ+KchISgw+vpHVxEJEs9eg=
@@ -330,6 +331,8 @@ github.com/rogpeppe/go-internal v1.9.0 h1:73kH8U+JUqXU8lRuOHeVHaa/SZPifC7BkcraZV
 github.com/ryanuber/columnize v0.0.0-20160712163229-9b3edd62028f/go.mod h1:sm1tb6uqfes/u+d4ooFouqFdy9/2g9QGwK3SQygK0Ts=
 github.com/sagikazarmark/crypt v0.14.0 h1:+QD5vjd6aZd6moHuIRVL+uJO7fkhiRjMz3ldbZQY5go=
 github.com/sagikazarmark/crypt v0.14.0/go.mod h1:JuxBJUNXrVOAywrtQNTZpOeTgcL1Az5qM7jKVDOifig=
+github.com/sagikazarmark/slog-shim v0.1.0 h1:diDBnUNK9N/354PgrxMywXnAwEr1QZcOr6gto+ugjYE=
+github.com/sagikazarmark/slog-shim v0.1.0/go.mod h1:SrcSrq8aKtyuqEI1uvTDTK1arOWRIczQRv+GVI1AkeQ=
 github.com/sean-/seed v0.0.0-20170313163322-e2103e2c3529 h1:nn5Wsu0esKSJiIVhscUtVbo7ada43DJhG55ua/hjS5I=
 github.com/sean-/seed v0.0.0-20170313163322-e2103e2c3529/go.mod h1:DxrIzT+xaE7yg65j358z/aeFdxmN0P9QXhEzd20vsDc=
 github.com/sirupsen/logrus v1.2.0/go.mod h1:LxeOpSwHxABJmUn/MG1IvRgCAasNZTLOkJPxbbu5VWo=
@@ -419,6 +422,8 @@ golang.org/x/exp v0.0.0-20200207192155-f17229e696bd/go.mod h1:J/WKrq2StrnmMY6+EH
 golang.org/x/exp v0.0.0-20200224162631-6cc2880d07d6/go.mod h1:3jZMyOhIsHpP37uCMkUooju7aAi5cS1Q23tOzKc+0MU=
 golang.org/x/exp v0.0.0-20230321023759-10a507213a29 h1:ooxPy7fPvB4kwsA2h+iBNHkAbp/4JxTSwCmvdjEYmug=
 golang.org/x/exp v0.0.0-20230321023759-10a507213a29/go.mod h1:CxIveKay+FTh1D0yPZemJVgC/95VzuuOLq5Qi4xnoYc=
+golang.org/x/exp v0.0.0-20230905200255-921286631fa9 h1:GoHiUyI/Tp2nVkLI2mCxVkOjsbSXD66ic0XW0js0R9g=
+golang.org/x/exp v0.0.0-20230905200255-921286631fa9/go.mod h1:S2oDrQGGwySpoQPVqRShND87VCbxmc6bL1Yd2oYrm6k=
 golang.org/x/image v0.0.0-20190227222117-0694c2d4d067/go.mod h1:kZ7UVZpmo3dzQBMxlp+ypCbDeSB+sBbTgSJuh5dn5js=
 golang.org/x/image v0.0.0-20190802002840-cff245a6509b/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
 golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=

logger.go

@@ -1,8 +1,10 @@
 package viper
 
 import (
+	"context"
 	"fmt"
 
+	slog "github.com/sagikazarmark/slog-shim"
 	jww "github.com/spf13/jwalterweatherman"
 )
 
@@ -75,3 +77,28 @@ func jwwLogMessage(msg string, keyvals ...interface{}) string {
 
 	return out
 }
+
+// WithLogger sets a custom logger.
+func WithLogger(l *slog.Logger) Option {
+	return optionFunc(func(v *Viper) {
+		v.logger = l
+	})
+}
+
+type discardHandler struct{}
+
+func (n *discardHandler) Enabled(_ context.Context, _ slog.Level) bool {
+	return false
+}
+
+func (n *discardHandler) Handle(_ context.Context, _ slog.Record) error {
+	return nil
+}
+
+func (n *discardHandler) WithAttrs(attrs []slog.Attr) slog.Handler {
+	return n
+}
+
+func (n *discardHandler) WithGroup(name string) slog.Handler {
+	return n
+}

util.go

@@ -18,6 +18,7 @@ import (
 	"strings"
 	"unicode"
 
+	slog "github.com/sagikazarmark/slog-shim"
 	"github.com/spf13/cast"
 )
 
@@ -104,7 +105,7 @@ func insensitiveArray(a []interface{}) {
 	}
 }
 
-func absPathify(logger Logger, inPath string) string {
+func absPathify(logger *slog.Logger, inPath string) string {
 	logger.Info("trying to resolve absolute path", "path", inPath)
 
 	if inPath == "$HOME" || strings.HasPrefix(inPath, "$HOME"+string(os.PathSeparator)) {

util_test.go

@@ -15,6 +15,8 @@ import (
 	"path/filepath"
 	"reflect"
 	"testing"
+
+	slog "github.com/sagikazarmark/slog-shim"
 )
 
 func TestCopyAndInsensitiviseMap(t *testing.T) {
@@ -85,7 +87,7 @@ func TestAbsPathify(t *testing.T) {
 	}
 
 	for _, test := range tests {
-		got := absPathify(jwwLogger{}, test.input)
+		got := absPathify(slog.Default(), test.input)
 		if got != test.output {
 			t.Errorf("Got %v\nexpected\n%q", got, test.output)
 		}

viper.go

@@ -35,6 +35,7 @@ import (
 
 	"github.com/fsnotify/fsnotify"
 	"github.com/mitchellh/mapstructure"
+	slog "github.com/sagikazarmark/slog-shim"
 	"github.com/spf13/afero"
 	"github.com/spf13/cast"
 	"github.com/spf13/pflag"
@@ -217,7 +218,7 @@ type Viper struct {
 
 	onConfigChange func(fsnotify.Event)
 
-	logger Logger
+	logger *slog.Logger
 
 	// TODO: should probably be protected with a mutex
 	encoderRegistry *encoding.EncoderRegistry
@@ -240,7 +241,7 @@ func New() *Viper {
 	v.env = make(map[string][]string)
 	v.aliases = make(map[string]string)
 	v.typeByDefValue = false
-	v.logger = jwwLogger{}
+	v.logger = slog.New(&discardHandler{})
 
 	v.resetEncoding()
 
@@ -1838,7 +1839,7 @@ func mergeMaps(
 	for sk, sv := range src {
 		tk := keyExists(sk, tgt)
 		if tk == "" {
-			v.logger.Trace("", "tk", "\"\"", fmt.Sprintf("tgt[%s]", sk), sv)
+			v.logger.Debug("", "tk", "\"\"", fmt.Sprintf("tgt[%s]", sk), sv)
 			tgt[sk] = sv
 			if itgt != nil {
 				itgt[sk] = sv
@@ -1848,7 +1849,7 @@ func mergeMaps(
 
 		tv, ok := tgt[tk]
 		if !ok {
-			v.logger.Trace("", fmt.Sprintf("ok[%s]", tk), false, fmt.Sprintf("tgt[%s]", sk), sv)
+			v.logger.Debug("", fmt.Sprintf("ok[%s]", tk), false, fmt.Sprintf("tgt[%s]", sk), sv)
 			tgt[sk] = sv
 			if itgt != nil {
 				itgt[sk] = sv
@@ -1859,7 +1860,7 @@ func mergeMaps(
 		svType := reflect.TypeOf(sv)
 		tvType := reflect.TypeOf(tv)
 
-		v.logger.Trace(
+		v.logger.Debug(
 			"processing",
 			"key", sk,
 			"st", svType,
@@ -1870,7 +1871,7 @@ func mergeMaps(
 
 		switch ttv := tv.(type) {
 		case map[interface{}]interface{}:
-			v.logger.Trace("merging maps (must convert)")
+			v.logger.Debug("merging maps (must convert)")
 			tsv, ok := sv.(map[interface{}]interface{})
 			if !ok {
 				v.logger.Error(
@@ -1888,7 +1889,7 @@ func mergeMaps(
 			stv := castToMapStringInterface(ttv)
 			mergeMaps(ssv, stv, ttv)
 		case map[string]interface{}:
-			v.logger.Trace("merging maps")
+			v.logger.Debug("merging maps")
 			tsv, ok := sv.(map[string]interface{})
 			if !ok {
 				v.logger.Error(
@@ -1903,7 +1904,7 @@ func mergeMaps(
 			}
 			mergeMaps(tsv, ttv, nil)
 		default:
-			v.logger.Trace("setting value")
+			v.logger.Debug("setting value")
 			tgt[tk] = sv
 			if itgt != nil {
 				itgt[tk] = sv