spf13/viper#73 Fix when no config found in specified directories

No config in specified directories now behave the same regardless if
the config file present in CWD or not

viper.go

@@ -72,6 +72,16 @@ func (rce RemoteConfigError) Error() string {
 	return fmt.Sprintf("Remote Configurations Error: %s", string(rce))
 }
 
+// Denotes failing to find configuration file.
+type ConfigFileNotFoundError struct {
+	name, locations string
+}
+
+// Returns the formatted configuration error.
+func (fnfe ConfigFileNotFoundError) Error() string {
+	return fmt.Sprintf("Config File %q Not Found in %q", fnfe.name, fnfe.locations)
+}
+
 // Viper is a prioritized configuration registry. It
 // maintains a set of configuration sources, fetches
 // values to populate those, and provides them according
@@ -955,9 +965,22 @@ func (v *Viper) searchInPath(in string) (filename string) {
 	return ""
 }
 
-// search all configPaths for any config file.
-// Returns the first path that exists (and is a config file)
+// Choose where to look for a config file: either
+// in provided directories or in the working directory
 func (v *Viper) findConfigFile() (string, error) {
+
+	if len(v.configPaths) > 0 {
+		return v.findConfigInPaths()
+	} else {
+		return v.findConfigInCWD()
+	}
+
+}
+
+// Search all configPaths for any config file.
+// Returns the first path that exists (and has a config file)
+func (v *Viper) findConfigInPaths() (string, error) {
+
 	jww.INFO.Println("Searching for config in ", v.configPaths)
 
 	for _, cp := range v.configPaths {
@@ -966,14 +989,20 @@ func (v *Viper) findConfigFile() (string, error) {
 			return file, nil
 		}
 	}
+	return "", ConfigFileNotFoundError{v.configName, fmt.Sprintf("%s", v.configPaths)}
+}
+
+// Search the current working directory for any config file.
+func (v *Viper) findConfigInCWD() (string, error) {
 
-	// try the current working directory
 	wd, _ := os.Getwd()
+	jww.INFO.Println("Searching for config in ", wd)
+
 	file := v.searchInPath(wd)
 	if file != "" {
 		return file, nil
 	}
-	return "", fmt.Errorf("config file not found in: %s", v.configPaths)
+	return "", ConfigFileNotFoundError{v.configName, wd}
 }
 
 // Prints all configuration registries for debugging

viper_test.go

@@ -646,7 +646,7 @@ func TestWrongDirsSearchNotFoundHasCWDConfig(t *testing.T) {
 	v.AddConfigPath(`thispathaintthere`)
 
 	err := v.ReadInConfig()
-	assert.Nil(t, err)
+	assert.Equal(t, reflect.TypeOf(UnsupportedConfigError("")), reflect.TypeOf(err))
 
 	// Should not see the value "root" which comes from config in CWD
 	assert.Equal(t, `default`, v.GetString(`key`))
@@ -657,6 +657,7 @@ func TestWrongDirsSearchNotFoundNoCWDConfig(t *testing.T) {
 	_, config, cleanup := initDirs(t)
 	defer cleanup()
 
+	// Remove the config file in CWD
 	os.Remove(config + ".toml")
 
 	v := New()