refactor flag names - make it more explicitly

avoid the using 'reflect' package while getting flag names

flag.go

@@ -203,12 +203,9 @@ func withEnvHint(envVars []string, str string) string {
 	return str + envText
 }
 
-func flagNames(f Flag) []string {
+func flagNames(name string, aliases []string) []string {
 	var ret []string
 
-	name := flagStringField(f, "Name")
-	aliases := flagStringSliceField(f, "Aliases")
-
 	for _, part := range append([]string{name}, aliases...) {
 		// v1 -> v2 migration warning zone:
 		// Strip off anything after the first found comma or space, which
@@ -231,17 +228,6 @@ func flagStringSliceField(f Flag, name string) []string {
 	return []string{}
 }
 
-func flagStringField(f Flag, name string) string {
-	fv := flagValue(f)
-	field := fv.FieldByName(name)
-
-	if field.IsValid() {
-		return field.String()
-	}
-
-	return ""
-}
-
 func withFileHint(filePath, str string) string {
 	fileText := ""
 	if filePath != "" {

flag_bool.go

@@ -34,7 +34,7 @@ func (f *BoolFlag) String() string {
 
 // Names returns the names of the flag
 func (f *BoolFlag) Names() []string {
-	return flagNames(f)
+	return flagNames(f.Name, f.Aliases)
 }
 
 // IsRequired returns whether or not the flag is required

flag_duration.go

@@ -34,7 +34,7 @@ func (f *DurationFlag) String() string {
 
 // Names returns the names of the flag
 func (f *DurationFlag) Names() []string {
-	return flagNames(f)
+	return flagNames(f.Name, f.Aliases)
 }
 
 // IsRequired returns whether or not the flag is required

flag_float64.go

@@ -34,7 +34,7 @@ func (f *Float64Flag) String() string {
 
 // Names returns the names of the flag
 func (f *Float64Flag) Names() []string {
-	return flagNames(f)
+	return flagNames(f.Name, f.Aliases)
 }
 
 // IsRequired returns whether or not the flag is required

flag_float64_slice.go

@@ -90,7 +90,7 @@ func (f *Float64SliceFlag) String() string {
 
 // Names returns the names of the flag
 func (f *Float64SliceFlag) Names() []string {
-	return flagNames(f)
+	return flagNames(f.Name, f.Aliases)
 }
 
 // IsRequired returns whether or not the flag is required

flag_generic.go

@@ -39,7 +39,7 @@ func (f *GenericFlag) String() string {
 
 // Names returns the names of the flag
 func (f *GenericFlag) Names() []string {
-	return flagNames(f)
+	return flagNames(f.Name, f.Aliases)
 }
 
 // IsRequired returns whether or not the flag is required

flag_int.go

@@ -34,7 +34,7 @@ func (f *IntFlag) String() string {
 
 // Names returns the names of the flag
 func (f *IntFlag) Names() []string {
-	return flagNames(f)
+	return flagNames(f.Name, f.Aliases)
 }
 
 // IsRequired returns whether or not the flag is required

flag_int64.go

@@ -34,7 +34,7 @@ func (f *Int64Flag) String() string {
 
 // Names returns the names of the flag
 func (f *Int64Flag) Names() []string {
-	return flagNames(f)
+	return flagNames(f.Name, f.Aliases)
 }
 
 // IsRequired returns whether or not the flag is required

flag_int64_slice.go

@@ -91,7 +91,7 @@ func (f *Int64SliceFlag) String() string {
 
 // Names returns the names of the flag
 func (f *Int64SliceFlag) Names() []string {
-	return flagNames(f)
+	return flagNames(f.Name, f.Aliases)
 }
 
 // IsRequired returns whether or not the flag is required

flag_int_slice.go

@@ -102,7 +102,7 @@ func (f *IntSliceFlag) String() string {
 
 // Names returns the names of the flag
 func (f *IntSliceFlag) Names() []string {
-	return flagNames(f)
+	return flagNames(f.Name, f.Aliases)
 }
 
 // IsRequired returns whether or not the flag is required

flag_path.go

@@ -30,7 +30,7 @@ func (f *PathFlag) String() string {
 
 // Names returns the names of the flag
 func (f *PathFlag) Names() []string {
-	return flagNames(f)
+	return flagNames(f.Name, f.Aliases)
 }
 
 // IsRequired returns whether or not the flag is required

flag_string.go

@@ -31,7 +31,7 @@ func (f *StringFlag) String() string {
 
 // Names returns the names of the flag
 func (f *StringFlag) Names() []string {
-	return flagNames(f)
+	return flagNames(f.Name, f.Aliases)
 }
 
 // IsRequired returns whether or not the flag is required

flag_string_slice.go

@@ -86,7 +86,7 @@ func (f *StringSliceFlag) String() string {
 
 // Names returns the names of the flag
 func (f *StringSliceFlag) Names() []string {
-	return flagNames(f)
+	return flagNames(f.Name, f.Aliases)
 }
 
 // IsRequired returns whether or not the flag is required

flag_timestamp.go

@@ -86,7 +86,7 @@ func (f *TimestampFlag) String() string {
 
 // Names returns the names of the flag
 func (f *TimestampFlag) Names() []string {
-	return flagNames(f)
+	return flagNames(f.Name, f.Aliases)
 }
 
 // IsRequired returns whether or not the flag is required

flag_uint.go

@@ -34,7 +34,7 @@ func (f *UintFlag) String() string {
 
 // Names returns the names of the flag
 func (f *UintFlag) Names() []string {
-	return flagNames(f)
+	return flagNames(f.Name, f.Aliases)
 }
 
 // IsRequired returns whether or not the flag is required

flag_uint64.go

@@ -34,7 +34,7 @@ func (f *Uint64Flag) String() string {
 
 // Names returns the names of the flag
 func (f *Uint64Flag) Names() []string {
-	return flagNames(f)
+	return flagNames(f.Name, f.Aliases)
 }
 
 // IsRequired returns whether or not the flag is required