Remove runtime package and OS checks in favor UserConfigDir and UserHomeDir which are platform agnostic and add more robust tests

cointop/common/pathutil/pathutil.go

@@ -3,22 +3,15 @@ package pathutil
 import (
 	"os"
 	"path/filepath"
-	"runtime"
 	"strings"
 )
 
 // UserPreferredHomeDir returns the preferred home directory for the user
 func UserPreferredHomeDir() (string, bool) {
-	var home string
 	var isConfigDir bool
 
-	if runtime.GOOS == "windows" {
-		home = os.Getenv("HOMEDRIVE") + os.Getenv("HOMEPATH")
-		isConfigDir = false
-	} else if runtime.GOOS == "linux" {
-		home = os.Getenv("XDG_CONFIG_HOME")
-		isConfigDir = true
-	}
+	home, _ := os.UserConfigDir()
+	isConfigDir = true
 
 	if home == "" {
 		home, _ = os.UserHomeDir()

cointop/common/pathutil/pathutil_test.go

@@ -8,13 +8,22 @@ import (
 
 // TestNormalizePath checks that NormalizePath returns the correct directory
 func TestNormalizePath(t *testing.T) {
+	home, _ := os.UserHomeDir()
+	configDir, _ := os.UserConfigDir()
 	cases := []struct {
 		in, want string
 	}{
-		{"~/.config/cointop/config.toml", filepath.Join(os.Getenv("XDG_CONFIG_HOME"), "/cointop/config.toml")},
+		{"~/.config/cointop/config.toml", filepath.Join(configDir, "/cointop/config.toml")},
+		{"~/.config/cointop/config.toml", filepath.Join(home, ".config/cointop/config.toml")},
+		{"~/.config/cointop/config.toml", filepath.Join(configDir, "/cointop/config.toml")},
+		{"~/.config/cointop/config.toml", filepath.Join(home, ".config/cointop/config.toml")},
 	}
-	for _, c := range cases {
+	for i, c := range cases {
 		got := NormalizePath(c.in)
+		if i > 1 {
+			home = ""
+			configDir = ""
+		}
 		if got != c.want {
 			t.Errorf("NormalizePath(%q) == %q, want %q", c.in, got, c.want)
 		}