added ability to delete key from Viper

go.mod

@@ -1,16 +1,45 @@
 module github.com/pupizoid/viper
 
 require (
+	github.com/BurntSushi/toml v0.3.1 // indirect
+	github.com/coreos/bbolt v1.3.2 // indirect
+	github.com/coreos/go-systemd v0.0.0-20190212144455-93d5ec2c7f76 // indirect
+	github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f // indirect
+	github.com/dgrijalva/jwt-go v3.2.0+incompatible // indirect
 	github.com/fsnotify/fsnotify v1.4.7
+	github.com/ghodss/yaml v1.0.0
+	github.com/gogo/protobuf v1.2.1 // indirect
+	github.com/golang/groupcache v0.0.0-20190129154638-5b532d6fd5ef // indirect
+	github.com/google/btree v0.0.0-20180813153112-4030bb1f1f0c // indirect
+	github.com/gorilla/websocket v1.4.0 // indirect
+	github.com/grpc-ecosystem/go-grpc-middleware v1.0.0 // indirect
+	github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0 // indirect
+	github.com/grpc-ecosystem/grpc-gateway v1.7.0 // indirect
 	github.com/hashicorp/hcl v1.0.0
+	github.com/jonboulle/clockwork v0.1.0 // indirect
 	github.com/magiconair/properties v1.8.0
-	github.com/mitchellh/mapstructure v1.0.0
+	github.com/mitchellh/mapstructure v1.1.2
+	github.com/nwingert/fsnotify v1.4.7
 	github.com/pelletier/go-toml v1.2.0
+	github.com/pkg/errors v0.8.1 // indirect
+	github.com/prometheus/client_golang v0.9.2 // indirect
+	github.com/prometheus/client_model v0.0.0-20190129233127-fd36f4220a90 // indirect
+	github.com/sirupsen/logrus v1.3.0 // indirect
+	github.com/soheilhy/cmux v0.1.4 // indirect
 	github.com/spf13/afero v1.1.2
-	github.com/spf13/cast v1.2.0
+	github.com/spf13/cast v1.3.0
 	github.com/spf13/jwalterweatherman v1.0.0
-	github.com/spf13/pflag v1.0.2
+	github.com/spf13/pflag v1.0.3
-	golang.org/x/sys v0.0.0-20180906133057-8cf3aee42992 // indirect
+	github.com/spf13/viper v1.3.1
-	golang.org/x/text v0.3.0 // indirect
+	github.com/stretchr/testify v1.3.0
-	gopkg.in/yaml.v2 v2.2.1
+	github.com/tmc/grpc-websocket-proxy v0.0.0-20190109142713-0ad062ec5ee5 // indirect
+	github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2 // indirect
+	github.com/xordataexchange/crypt v0.0.3-0.20170626215501-b2862e3d0a77
+	go.etcd.io/bbolt v1.3.2 // indirect
+	go.uber.org/atomic v1.3.2 // indirect
+	go.uber.org/multierr v1.1.0 // indirect
+	go.uber.org/zap v1.9.1 // indirect
+	golang.org/x/net v0.0.0-20190213061140-3a22650c66bd // indirect
+	golang.org/x/time v0.0.0-20181108054448-85acf8d2951c // indirect
+	google.golang.org/grpc v1.18.0 // indirect
 )

go.sum

@@ -1,26 +1,145 @@
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viper.go

@@ -45,7 +45,7 @@ import (
 	"github.com/spf13/cast"
 	jww "github.com/spf13/jwalterweatherman"
 	"github.com/spf13/pflag"
-	)
+)
 
 // ConfigMarshalError happens when failing to marshal the configuration.
 type ConfigMarshalError struct {
@@ -279,8 +279,33 @@ func (v *Viper) OnConfigChange(run func(in fsnotify.Event)) {
 	v.onConfigChange = run
 }
 
-func WatchConfig() { v.WatchConfig() }
+func (v *Viper) removeKeyFromMap(m map[string]interface{}, key string) {
+	steps := strings.SplitN(key, v.keyDelim, 2)
 
+	if val, ok := m[steps[0]]; ok {
+		if inner, ok := val.(map[string]interface{}); ok {
+			if len(steps) == 1 {
+				delete(m, steps[0])
+			} else {
+				v.removeKeyFromMap(inner, steps[1])
+			}
+		} else {
+			delete(m, steps[0])
+		}
+	}
+}
+
+func RemoveKey(path string) { v.RemoveKey(path) }
+func (v *Viper) RemoveKey(path string) {
+	v.Mutex.Lock()
+	v.removeKeyFromMap(v.config, path)
+	v.removeKeyFromMap(v.override, path)
+	v.removeKeyFromMap(v.defaults, path)
+	v.removeKeyFromMap(v.kvstore, path)
+	v.Mutex.Unlock()
+}
+
+func WatchConfig() { v.WatchConfig() }
 func (v *Viper) WatchConfig() {
 	initWG := sync.WaitGroup{}
 	initWG.Add(1)
@@ -289,7 +314,11 @@ func (v *Viper) WatchConfig() {
 		if err != nil {
 			log.Fatal(err)
 		}
-		defer watcher.Close()
+		defer func() {
+			if err := watcher.Close(); err != nil {
+				log.Printf("failed to close watcher: %v", err)
+			}
+		}()
 		// we have to watch the entire directory to pick up renames/atomic saves in a cross-platform way
 		filename, err := v.getConfigFile()
 		if err != nil {
@@ -1714,7 +1743,7 @@ func (v *Viper) flattenAndMergeMap(shadow map[string]bool, m map[string]interfac
 func (v *Viper) mergeFlatMap(shadow map[string]bool, m map[string]interface{}) map[string]bool {
 	// scan keys
 outer:
-	for k, _ := range m {
+	for k := range m {
 		path := strings.Split(k, v.keyDelim)
 		// scan intermediate paths
 		var parentKey string

viper_test.go

@@ -22,8 +22,8 @@ import (
 	"testing"
 	"time"
 
-	"github.com/fsnotify/fsnotify"
 	"github.com/mitchellh/mapstructure"
+	"github.com/nwingert/fsnotify"
 	"github.com/spf13/afero"
 	"github.com/spf13/cast"
 
@@ -280,7 +280,7 @@ func TestUnmarshaling(t *testing.T) {
 	assert.Equal(t, "steve", Get("name"))
 	assert.Equal(t, []interface{}{"skateboarding", "snowboarding", "go"}, Get("hobbies"))
 	assert.Equal(t, map[string]interface{}{"jacket": "leather", "trousers": "denim", "pants": map[string]interface{}{"size": "large"}}, Get("clothing"))
-	assert.Equal(t, 35, Get("age"))
+	assert.EqualValues(t, 35, Get("age"))
 }
 
 func TestUnmarshalExact(t *testing.T) {
@@ -480,7 +480,7 @@ func TestAllKeys(t *testing.T) {
 	ks.Sort()
 
 	assert.Equal(t, ks, allkeys)
-	assert.Equal(t, all, AllSettings())
+	assert.True(t, reflect.DeepEqual(all, AllSettings()))
 }
 
 func TestAllKeysWithEnv(t *testing.T) {
@@ -819,7 +819,7 @@ func TestFindsNestedKeys(t *testing.T) {
 
 	for key, expectedValue := range expected {
 
-		assert.Equal(t, expectedValue, v.Get(key))
+		assert.EqualValues(t, expectedValue, v.Get(key))
 	}
 
 }
@@ -835,7 +835,7 @@ func TestReadBufConfig(t *testing.T) {
 	assert.Equal(t, "steve", v.Get("name"))
 	assert.Equal(t, []interface{}{"skateboarding", "snowboarding", "go"}, v.Get("hobbies"))
 	assert.Equal(t, map[string]interface{}{"jacket": "leather", "trousers": "denim", "pants": map[string]interface{}{"size": "large"}}, v.Get("clothing"))
-	assert.Equal(t, 35, v.Get("age"))
+	assert.EqualValues(t, 35, v.Get("age"))
 }
 
 func TestIsSet(t *testing.T) {
@@ -1586,3 +1586,26 @@ func BenchmarkGetBoolFromMap(b *testing.B) {
 		}
 	}
 }
+
+func TestRemoveKey(t *testing.T) {
+	v := New()
+
+	v.Set("flat", 123)
+	v.Set("test.inner", 321)
+	v.Set("test.inner2", 456)
+
+	assert.EqualValues(t, 123, v.override["flat"])
+	assert.EqualValues(t, 321, v.override["test"].(map[string]interface{})["inner"])
+	assert.EqualValues(t, 456, v.override["test"].(map[string]interface{})["inner2"])
+
+	v.RemoveKey("flat")
+	v.RemoveKey("test.inner")
+
+	assert.EqualValues(t, nil, v.Get("flat"))
+	assert.EqualValues(t, nil, v.Get("test.inner"))
+	assert.EqualValues(t, 456, v.Get("test.inner2"))
+
+	v.RemoveKey("test")
+
+	assert.EqualValues(t, nil, v.Get("test"))
+}