Add home directory to config file search paths (#1325)

docs/src/docs/usage/configuration.mdx

@@ -28,6 +28,7 @@ GolangCI-Lint looks for config files in the following paths from the current wor
 - `.golangci.json`
 
 GolangCI-Lint also searches for config files in all directories from the directory of the first analyzed path up to the root.
+If no configuration file has been found, GolangCI-Lint will try to find one in your home directory.
 To see which config file is being used and where it was sourced from run golangci-lint with `-v` option.
 
 Config options inside the file are identical to command-line options.

pkg/config/reader.go

@@ -170,6 +170,7 @@ func (r *FileReader) setupConfigFileSearch() {
 
 	// find all dirs from it up to the root
 	configSearchPaths := []string{"./"}
+
 	for {
 		configSearchPaths = append(configSearchPaths, curDir)
 		newCurDir := filepath.Dir(curDir)
@@ -179,6 +180,13 @@ func (r *FileReader) setupConfigFileSearch() {
 		curDir = newCurDir
 	}
 
+	// find home directory for global config
+	if home, err := homedir.Dir(); err != nil {
+		r.log.Warnf("Can't get user's home directory: %s", err.Error())
+	} else if !sliceContains(configSearchPaths, home) {
+		configSearchPaths = append(configSearchPaths, home)
+	}
+
 	r.log.Infof("Config search paths: %s", configSearchPaths)
 	viper.SetConfigName(".golangci")
 	for _, p := range configSearchPaths {
@@ -186,6 +194,15 @@ func (r *FileReader) setupConfigFileSearch() {
 	}
 }
 
+func sliceContains(slice []string, value string) bool {
+	for _, v := range slice {
+		if v == value {
+			return true
+		}
+	}
+	return false
+}
+
 var errConfigDisabled = errors.New("config is disabled by --no-config")
 
 func (r *FileReader) parseConfigOption() (string, error) {