fix: ignore unexported fields

chore: upgrade ecp to v0.2.3

go.mod

@@ -2,4 +2,4 @@ module github.com/wrfly/gua
 
 go 1.12
 
-require github.com/wrfly/ecp v0.2.0
+require github.com/wrfly/ecp v0.2.3

go.sum

@@ -1,2 +1,2 @@
-github.com/wrfly/ecp v0.2.0 h1:nfPa9FMAOvn3mgwDOAr+0f8thaCzpN/FBpBJdQNpM4I=
-github.com/wrfly/ecp v0.2.0/go.mod h1:cmmFTD+MLlrDa3/EO3gjeKLKUhHiYP3cgaaJamIS1NU=
+github.com/wrfly/ecp v0.2.3 h1:yTCwNVq8L5aOFCrTf5kyFZsihQYUHASz1Zr/w78JENI=
+github.com/wrfly/ecp v0.2.3/go.mod h1:8rt/LxDJNLd6AxL56hbbbNWZfJLK4x8+UU4Fyey0m+8=

gua.go

@@ -18,25 +18,22 @@ type gua struct {
 	f *flag.FlagSet
 }
 
-func firstKeyLower(s string) string {
-	if s == "" {
-		return s
-	}
-	return strings.ToLower(string(s[0])) + s[1:]
-}
+func (g *gua) getKey(structure, field string, tag reflect.StructTag) string {
+	structure = strings.ToLower(structure)
+	field = strings.ToLower(field)
 
-func (g *gua) getKey(pName, sName string, tag reflect.StructTag) string {
-	desc := tag.Get("desc")
 	key := tag.Get("name")
-	pName = firstKeyLower(pName)
-	sName = firstKeyLower(sName)
-	if key == "" {
-		if pName == "" {
-			key = sName
+	if key == "-" { // ignore this key
+		return ""
+	}
+	if key == "" && field != "" {
+		if structure == "" {
+			key = field
 		} else {
-			key = pName + "." + sName
+			key = structure + "." + field
 		}
 	}
+	desc := tag.Get("desc")
 	if desc != "" {
 		key += splitter + desc
 	}