Support config files with no extensions

viper.go

@@ -1863,6 +1863,10 @@ func (v *Viper) getConfigFile() (string, error) {
 
 func (v *Viper) searchInPath(in string) (filename string) {
 	jww.DEBUG.Println("Searching for config in ", in)
+	if b, _ := exists(v.fs, filepath.Join(in, v.configName)); b {
+		return filepath.Join(in, v.configName)
+	}
+
 	for _, ext := range SupportedExts {
 		jww.DEBUG.Println("Checking for", filepath.Join(in, v.configName+"."+ext))
 		if b, _ := exists(v.fs, filepath.Join(in, v.configName+"."+ext)); b {

viper_test.go

@@ -14,6 +14,7 @@ import (
 	"os"
 	"os/exec"
 	"path"
+	"path/filepath"
 	"reflect"
 	"runtime"
 	"sort"
@@ -273,6 +274,22 @@ func TestBasics(t *testing.T) {
 	assert.NoError(t, err)
 }
 
+func TestSearchInPath(t *testing.T) {
+	filename := ".dotfilenoext"
+	path := "/tmp"
+	file := filepath.Join(path, filename)
+	SetConfigName(filename)
+	AddConfigPath(path)
+	_, createErr := v.fs.Create(file)
+	defer func() {
+		_ = v.fs.Remove(file)
+	}()
+	assert.NoError(t, createErr)
+	filename, err := v.getConfigFile()
+	assert.Equal(t, file, filename)
+	assert.NoError(t, err)
+}
+
 func TestDefault(t *testing.T) {
 	SetDefault("age", 45)
 	assert.Equal(t, 45, Get("age"))