Add negatable output when using short flag names

help.go

@@ -469,17 +469,21 @@ func formatFlag(haveShort bool, flag *Flag) string {
 	name := flag.Name
 	isBool := flag.IsBool()
 	if flag.Short != 0 {
-		flagString += fmt.Sprintf("-%c, --%s", flag.Short, name)
+		if isBool && flag.Tag.Negatable {
+			flagString += fmt.Sprintf("-%c, --[no-]%s", flag.Short, name)
+		} else {
+			flagString += fmt.Sprintf("-%c, --%s", flag.Short, name)
+		}
 	} else {
-		if haveShort {
-			if isBool && flag.Tag.Negatable {
+		if isBool && flag.Tag.Negatable {
+			if haveShort {
 				flagString = fmt.Sprintf("    --[no-]%s", name)
 			} else {
-				flagString += fmt.Sprintf("    --%s", name)
+				flagString = fmt.Sprintf("--[no-]%s", name)
 			}
 		} else {
-			if isBool && flag.Tag.Negatable {
-				flagString = fmt.Sprintf("--[no-]%s", name)
+			if haveShort {
+				flagString += fmt.Sprintf("    --%s", name)
 			} else {
 				flagString += fmt.Sprintf("--%s", name)
 			}

help_test.go

@@ -29,7 +29,7 @@ func TestHelp(t *testing.T) {
 		Slice    []string       `help:"A slice of strings." placeholder:"STR"`
 		Map      map[string]int `help:"A map of strings to ints."`
 		Required bool           `required help:"A required flag."`
-		Sort     bool           `negatable help:"Is sortable or not."`
+		Sort     bool           `negatable short:"s" help:"Is sortable or not."`
 
 		One struct {
 			Flag string `help:"Nested flag."`
@@ -76,7 +76,7 @@ Flags:
       --slice=STR,...        A slice of strings.
       --map=KEY=VALUE;...    A map of strings to ints.
       --required             A required flag.
-      --[no-]sort            Is sortable or not.
+  -s, --[no-]sort            Is sortable or not.
 
 Commands:
   one --required
@@ -117,7 +117,7 @@ Flags:
       --slice=STR,...        A slice of strings.
       --map=KEY=VALUE;...    A map of strings to ints.
       --required             A required flag.
-      --[no-]sort            Is sortable or not.
+  -s, --[no-]sort            Is sortable or not.
 
       --flag=STRING          Nested flag under two.
       --required-two