add dot-accessor notation

Environment variables are unaffected by Delete, making it misleading —
callers would expect a key to be fully gone but env vars would still
resolve. Sub is the better abstraction for scoped config.

default.go

@@ -88,10 +88,6 @@ func SetString(key string, value string) {
 	defaultConfigManager.SetString(key, value)
 }
 
-func Delete(key string) {
-	defaultConfigManager.Delete(key)
-}
-
 func Sub(key string) *ConfigManager {
 	return defaultConfigManager.Sub(key)
 }

getters.go

@@ -8,17 +8,71 @@ import (
 )
 
 // resolve looks up a key in combinedConfig, falling back to envConfig.
+// It supports dot notation (e.g., "services.mas.server") to traverse nested maps.
 func (c *ConfigManager) resolve(key string) (ConfigMap, bool) {
 	lower := strings.ToLower(key)
+
+	// First, try direct lookup (for top-level keys or keys without dots)
 	if v, ok := c.combinedConfig[lower]; ok {
 		return v, true
 	}
 	if v, ok := c.envConfig[lower]; ok {
 		return v, true
 	}
+
+	// If key contains dots, try traversing nested maps
+	if strings.Contains(lower, ".") {
+		if v, ok := c.resolveNested(lower, c.combinedConfig); ok {
+			return v, true
+		}
+		if v, ok := c.resolveNested(lower, c.envConfig); ok {
+			return v, true
+		}
+	}
+
 	return ConfigMap{}, false
 }
 
+// resolveNested traverses nested maps using dot-separated key paths.
+func (c *ConfigManager) resolveNested(key string, config map[string]ConfigMap) (ConfigMap, bool) {
+	parts := strings.Split(key, ".")
+	if len(parts) < 2 {
+		return ConfigMap{}, false
+	}
+
+	// Look up the first part in the config
+	firstPart := parts[0]
+	entry, ok := config[firstPart]
+	if !ok {
+		return ConfigMap{}, false
+	}
+
+	// Traverse the remaining parts through nested maps
+	current := entry.Value
+	for i := 1; i < len(parts); i++ {
+		m, ok := current.(map[string]any)
+		if !ok {
+			return ConfigMap{}, false
+		}
+
+		// Try case-insensitive lookup in the nested map
+		part := parts[i]
+		found := false
+		for k, v := range m {
+			if strings.EqualFold(k, part) {
+				current = v
+				found = true
+				break
+			}
+		}
+		if !found {
+			return ConfigMap{}, false
+		}
+	}
+
+	return ConfigMap{Key: key, Value: current}, true
+}
+
 func (c *ConfigManager) Get(key string) any {
 	c.mutex.RLock()
 	defer c.mutex.RUnlock()

jety_test.go

@@ -1555,81 +1555,6 @@ func TestPackageLevelGetInt64(t *testing.T) {
 	}
 }
 
-func TestDelete(t *testing.T) {
-	cm := NewConfigManager()
-	cm.SetDefault("keep", "yes")
-	cm.SetDefault("remove", "default")
-	cm.Set("remove", "override")
-
-	if !cm.IsSet("remove") {
-		t.Fatal("remove should be set before delete")
-	}
-
-	cm.Delete("remove")
-
-	if cm.IsSet("remove") {
-		t.Error("remove should not be set after delete")
-	}
-	if cm.Get("remove") != nil {
-		t.Error("Get(remove) should return nil after delete")
-	}
-	if cm.GetString("keep") != "yes" {
-		t.Error("keep should be unaffected by deleting remove")
-	}
-}
-
-func TestDeleteFromAllLayers(t *testing.T) {
-	dir := t.TempDir()
-	configFile := filepath.Join(dir, "config.toml")
-	if err := os.WriteFile(configFile, []byte(`filekey = "fromfile"`), 0o644); err != nil {
-		t.Fatal(err)
-	}
-
-	cm := NewConfigManager()
-	cm.SetConfigFile(configFile)
-	if err := cm.SetConfigType("toml"); err != nil {
-		t.Fatal(err)
-	}
-	cm.SetDefault("filekey", "default")
-	if err := cm.ReadInConfig(); err != nil {
-		t.Fatal(err)
-	}
-	cm.Set("filekey", "override")
-
-	if cm.GetString("filekey") != "override" {
-		t.Fatal("expected override value before delete")
-	}
-
-	cm.Delete("filekey")
-
-	if cm.IsSet("filekey") {
-		t.Error("filekey should not be set after delete from all layers")
-	}
-}
-
-func TestDeleteCaseInsensitive(t *testing.T) {
-	cm := NewConfigManager()
-	cm.Set("MyKey", "value")
-
-	cm.Delete("MYKEY")
-
-	if cm.IsSet("mykey") {
-		t.Error("delete should be case-insensitive")
-	}
-}
-
-func TestPackageLevelDelete(t *testing.T) {
-	defaultConfigManager = NewConfigManager()
-	Set("temp", "value")
-	if !IsSet("temp") {
-		t.Fatal("temp should be set")
-	}
-	Delete("temp")
-	if IsSet("temp") {
-		t.Error("temp should not be set after package-level Delete")
-	}
-}
-
 func TestSub(t *testing.T) {
 	dir := t.TempDir()
 	configFile := filepath.Join(dir, "config.toml")
@@ -1721,3 +1646,153 @@ func TestPackageLevelSub(t *testing.T) {
 		t.Errorf("Sub(db).GetInt(port) = %d, want 5432", sub.GetInt("port"))
 	}
 }
+
+func TestDotNotationAccess(t *testing.T) {
+	const tomlWithNested = `
+port = 8080
+
+[services.mas]
+server = "192.168.1.15"
+user = "central"
+disabled = false
+
+[services.salesforce.prod]
+host = "sf.example.com"
+port = 443
+`
+
+	dir := t.TempDir()
+	configFile := filepath.Join(dir, "nested.toml")
+	if err := os.WriteFile(configFile, []byte(tomlWithNested), 0o644); err != nil {
+		t.Fatal(err)
+	}
+
+	cm := NewConfigManager()
+	cm.SetConfigFile(configFile)
+	if err := cm.SetConfigType("toml"); err != nil {
+		t.Fatal(err)
+	}
+	if err := cm.ReadInConfig(); err != nil {
+		t.Fatal(err)
+	}
+
+	// Top-level key should still work
+	if got := cm.GetInt("port"); got != 8080 {
+		t.Errorf("GetInt(port) = %d, want 8080", got)
+	}
+
+	// Dot notation for nested string
+	if got := cm.GetString("services.mas.server"); got != "192.168.1.15" {
+		t.Errorf("GetString(services.mas.server) = %q, want %q", got, "192.168.1.15")
+	}
+	if got := cm.GetString("services.mas.user"); got != "central" {
+		t.Errorf("GetString(services.mas.user) = %q, want %q", got, "central")
+	}
+
+	// Dot notation for nested bool
+	if got := cm.GetBool("services.mas.disabled"); got != false {
+		t.Errorf("GetBool(services.mas.disabled) = %v, want false", got)
+	}
+
+	// Dot notation for nested map
+	masMap := cm.GetStringMap("services.mas")
+	if masMap == nil {
+		t.Fatal("GetStringMap(services.mas) = nil")
+	}
+	if masMap["server"] != "192.168.1.15" {
+		t.Errorf("services.mas map server = %v, want %q", masMap["server"], "192.168.1.15")
+	}
+
+	// Three levels deep
+	if got := cm.GetString("services.salesforce.prod.host"); got != "sf.example.com" {
+		t.Errorf("GetString(services.salesforce.prod.host) = %q, want %q", got, "sf.example.com")
+	}
+	if got := cm.GetInt("services.salesforce.prod.port"); got != 443 {
+		t.Errorf("GetInt(services.salesforce.prod.port) = %d, want 443", got)
+	}
+
+	// GetStringMap at intermediate level
+	sfProdMap := cm.GetStringMap("services.salesforce.prod")
+	if sfProdMap == nil {
+		t.Fatal("GetStringMap(services.salesforce.prod) = nil")
+	}
+	if sfProdMap["host"] != "sf.example.com" {
+		t.Errorf("salesforce.prod map host = %v, want %q", sfProdMap["host"], "sf.example.com")
+	}
+
+	// Nonexistent nested key should return zero value
+	if got := cm.GetString("services.mas.nonexistent"); got != "" {
+		t.Errorf("GetString(services.mas.nonexistent) = %q, want empty", got)
+	}
+	if got := cm.GetStringMap("services.nonexistent"); got != nil {
+		t.Errorf("GetStringMap(services.nonexistent) = %v, want nil", got)
+	}
+}
+
+func TestDotNotationCaseInsensitive(t *testing.T) {
+	cm := NewConfigManager()
+	cm.Set("services", map[string]any{
+		"MAS": map[string]any{
+			"Server": "192.168.1.15",
+		},
+	})
+
+	// Should work regardless of case
+	if got := cm.GetString("services.mas.server"); got != "192.168.1.15" {
+		t.Errorf("GetString(services.mas.server) = %q, want %q", got, "192.168.1.15")
+	}
+	if got := cm.GetString("SERVICES.MAS.SERVER"); got != "192.168.1.15" {
+		t.Errorf("GetString(SERVICES.MAS.SERVER) = %q, want %q", got, "192.168.1.15")
+	}
+	if got := cm.GetString("Services.Mas.Server"); got != "192.168.1.15" {
+		t.Errorf("GetString(Services.Mas.Server) = %q, want %q", got, "192.168.1.15")
+	}
+}
+
+func TestDotNotationWithAllGetters(t *testing.T) {
+	cm := NewConfigManager()
+	cm.Set("config", map[string]any{
+		"nested": map[string]any{
+			"string":  "hello",
+			"int":     42,
+			"int64":   int64(9223372036854775807),
+			"float":   3.14,
+			"bool":    true,
+			"dur":     "30s",
+			"strings": []string{"a", "b", "c"},
+			"ints":    []any{1, 2, 3},
+			"map":     map[string]any{"key": "value"},
+		},
+	})
+
+	if got := cm.Get("config.nested.string"); got != "hello" {
+		t.Errorf("Get(config.nested.string) = %v, want %q", got, "hello")
+	}
+	if got := cm.GetString("config.nested.string"); got != "hello" {
+		t.Errorf("GetString(config.nested.string) = %q, want %q", got, "hello")
+	}
+	if got := cm.GetInt("config.nested.int"); got != 42 {
+		t.Errorf("GetInt(config.nested.int) = %d, want 42", got)
+	}
+	if got := cm.GetInt64("config.nested.int64"); got != 9223372036854775807 {
+		t.Errorf("GetInt64(config.nested.int64) = %d, want 9223372036854775807", got)
+	}
+	if got := cm.GetFloat64("config.nested.float"); got != 3.14 {
+		t.Errorf("GetFloat64(config.nested.float) = %f, want 3.14", got)
+	}
+	if got := cm.GetBool("config.nested.bool"); got != true {
+		t.Errorf("GetBool(config.nested.bool) = %v, want true", got)
+	}
+	if got := cm.GetDuration("config.nested.dur"); got != 30*time.Second {
+		t.Errorf("GetDuration(config.nested.dur) = %v, want 30s", got)
+	}
+	if got := cm.GetStringSlice("config.nested.strings"); len(got) != 3 || got[0] != "a" {
+		t.Errorf("GetStringSlice(config.nested.strings) = %v, want [a b c]", got)
+	}
+	if got := cm.GetIntSlice("config.nested.ints"); len(got) != 3 || got[0] != 1 {
+		t.Errorf("GetIntSlice(config.nested.ints) = %v, want [1 2 3]", got)
+	}
+	if got := cm.GetStringMap("config.nested.map"); got == nil || got["key"] != "value" {
+		t.Errorf("GetStringMap(config.nested.map) = %v, want map[key:value]", got)
+	}
+}

setters.go

@@ -28,19 +28,6 @@ func (c *ConfigManager) Set(key string, value any) {
 	c.combinedConfig[lower] = ConfigMap{Key: key, Value: value}
 }
 
-// Delete removes a key from all configuration layers (overrides, file,
-// defaults) and rebuilds the combined configuration. Environment variables
-// are not affected since they are loaded from the process environment.
-func (c *ConfigManager) Delete(key string) {
-	c.mutex.Lock()
-	lower := strings.ToLower(key)
-	delete(c.overrideConfig, lower)
-	delete(c.fileConfig, lower)
-	delete(c.defaultConfig, lower)
-	delete(c.combinedConfig, lower)
-	c.mutex.Unlock()
-}
-
 func (c *ConfigManager) SetDefault(key string, value any) {
 	c.mutex.Lock()
 	defer c.mutex.Unlock()