cleanup loading config from different locations (based on user env va…

…riables) - using afero for mocking fs

cli/main.go

@@ -13,13 +13,15 @@ import (
 	"github.com/mgechev/revive/config"
 	"github.com/mgechev/revive/revivelib"
 	"github.com/mitchellh/go-homedir"
+	"github.com/spf13/afero"
 )
 
 var (
 	version = "dev"
 	commit  = "none"
 	date    = "unknown"
 	builtBy = "unknown"
+	AppFs   = afero.NewOsFs()
 )
 
 func fail(err string) {
@@ -29,7 +31,10 @@ func fail(err string) {
 
 // RunRevive runs the CLI for revive.
 func RunRevive(extraRules ...revivelib.ExtraRule) {
-	conf, err := config.GetConfig(configPath)
+	// move parsing flags outside of init() otherwise tests dont works properly
+	// more info: https://github.com/golang/go/issues/46869#issuecomment-865695953
+	initConfig()
+    conf, err := config.GetConfig(configPath)
 	if err != nil {
 		fail(err.Error())
 	}
@@ -105,17 +110,26 @@ Example:
 
 func buildDefaultConfigPath() string {
 	var result string
+	var homeDirFile string
+	configFileName := "revive.toml"
+	configDirFile := filepath.Join(os.Getenv("XDG_CONFIG_HOME"), configFileName)
+
 	if homeDir, err := homedir.Dir(); err == nil {
-		result = filepath.Join(homeDir, "revive.toml")
-		if _, err := os.Stat(result); err != nil {
-			result = ""
-		}
+		homeDirFile = filepath.Join(homeDir, configFileName)
+	}
+
+	if fileExist(configDirFile) {
+		result = configDirFile
+	} else if fileExist(homeDirFile) {
+		result = homeDirFile
+	} else {
+		result = ""
 	}
 
 	return result
 }
 
-func init() {
+func initConfig() {
 	// Force colorizing for no TTY environments
 	if os.Getenv("REVIVE_FORCE_COLOR") == "1" {
 		color.NoColor = false
@@ -128,7 +142,7 @@ func init() {
 
 	// command line help strings
 	const (
-		configUsage       = "path to the configuration TOML file, defaults to $HOME/revive.toml, if present (i.e. -config myconf.toml)"
+		configUsage       = "path to the configuration TOML file, defaults to $XDG_CONFIG_HOME/revive.toml or $HOME/revive.toml, if present (i.e. -config myconf.toml)"
 		excludeUsage      = "list of globs which specify files to be excluded (i.e. -exclude foo/...)"
 		formatterUsage    = "formatter to be used for the output (i.e. -formatter stylish)"
 		versionUsage      = "get revive version"
@@ -175,3 +189,12 @@ func init() {
 		os.Exit(0)
 	}
 }
+
+func fileExist(path string) bool {
+	_, err := AppFs.Stat(path)
+	if err != nil {
+		return false
+	}
+
+	return true
+}

cli/main_test.go

@@ -0,0 +1,60 @@
+package cli
+
+import (
+	"os"
+	"testing"
+
+	"github.com/spf13/afero"
+)
+
+func init() {
+
+    AppFs = afero.NewMemMapFs()
+}
+
+func TestHomeConfigDir(t *testing.T) {
+
+    homeDirPath := "/tmp-iofs/home/tester"
+	AppFs.MkdirAll(homeDirPath, 0755)
+
+	afero.WriteFile(AppFs, homeDirPath+"/revive.toml", []byte("\n"), 0644)
+	os.Setenv("HOME", homeDirPath)
+
+    got := buildDefaultConfigPath()
+	want := homeDirPath + "/revive.toml"
+
+	if got != want {
+		t.Errorf("got %q, wanted %q", got, want)
+	}
+
+}
+
+func TestXDGConfigDir(t *testing.T) {
+
+	xdgDirPath := "/tmp-iofs/xdg/config"
+	AppFs.MkdirAll(xdgDirPath, 0755)
+
+	afero.WriteFile(AppFs, xdgDirPath+"/revive.toml", []byte("\n"), 0644)
+	os.Setenv("XDG_CONFIG_HOME", xdgDirPath)
+
+	got := buildDefaultConfigPath()
+	want := xdgDirPath + "/revive.toml"
+
+	if got != want {
+		t.Errorf("got %q, wanted %q", got, want)
+	}
+
+}
+
+func TestXDGConfigDirNoFile(t *testing.T) {
+
+	xdgDirPath := "/tmp-iofs/xdg/config"
+    os.Setenv("XDG_CONFIG_HOME", xdgDirPath)
+
+    got := buildDefaultConfigPath()
+	want := xdgDirPath + "/revive.toml"
+
+	if got != want {
+		t.Errorf("got %q, wanted %q", got, want)
+	}
+}

go.mod

@@ -11,12 +11,16 @@ require (
 	github.com/mitchellh/go-homedir v1.1.0
 	github.com/olekukonko/tablewriter v0.0.5
 	github.com/pkg/errors v0.9.1
+	github.com/spf13/afero v1.10.0
 	golang.org/x/tools v0.13.0
 )
 
+replace github.com/spf13/afero => github.com/spf13/afero v1.10.0
+
 require (
 	github.com/mattn/go-colorable v0.1.13 // indirect
 	github.com/mattn/go-isatty v0.0.17 // indirect
 	github.com/mattn/go-runewidth v0.0.9 // indirect
 	golang.org/x/sys v0.12.0 // indirect
+	golang.org/x/text v0.13.0 // indirect
 )