Do not show subcommands in bash completion if a local flag was specified

If a user specifies a flag to a command which doesn't make sense to a
subcommand do not show subcommands as a suggestion.

This also changes things to show both 'required flags' and 'commands'
instead of only 'required flags'

bash_completions.go

@@ -167,6 +167,11 @@ __handle_flag()
         must_have_one_flag=()
     fi
 
+    # if you set a flag which only applies to this command, don't show subcommands
+    if __contains_word "${flagname}" "${local_nonpersistent_flags[@]}"; then
+      commands=()
+    fi
+
     # keep flag value with flagname as flaghash
     if [ -n "${flagvalue}" ] ; then
         flaghash[${flagname}]=${flagvalue}
@@ -263,6 +268,7 @@ func postscript(w io.Writer, name string) error {
     local c=0
     local flags=()
     local two_word_flags=()
+    local local_nonpersistent_flags=()
     local flags_with_completion=()
     local flags_completion=()
     local commands=("%s")
@@ -360,7 +366,7 @@ func writeFlagHandler(name string, annotations map[string][]string, w io.Writer)
 }
 
 func writeShortFlag(flag *pflag.Flag, w io.Writer) error {
-	b := (flag.Value.Type() == "bool")
+	b := (len(flag.NoOptDefVal) > 0)
 	name := flag.Shorthand
 	format := "    "
 	if !b {
@@ -374,7 +380,7 @@ func writeShortFlag(flag *pflag.Flag, w io.Writer) error {
 }
 
 func writeFlag(flag *pflag.Flag, w io.Writer) error {
-	b := (flag.Value.Type() == "bool")
+	b := (len(flag.NoOptDefVal) > 0)
 	name := flag.Name
 	format := "    flags+=(\"--%s"
 	if !b {
@@ -387,9 +393,24 @@ func writeFlag(flag *pflag.Flag, w io.Writer) error {
 	return writeFlagHandler("--"+name, flag.Annotations, w)
 }
 
+func writeLocalNonPersistentFlag(flag *pflag.Flag, w io.Writer) error {
+	b := (len(flag.NoOptDefVal) > 0)
+	name := flag.Name
+	format := "    local_nonpersistent_flags+=(\"--%s"
+	if !b {
+		format += "="
+	}
+	format += "\")\n"
+	if _, err := fmt.Fprintf(w, format, name); err != nil {
+		return err
+	}
+	return nil
+}
+
 func writeFlags(cmd *Command, w io.Writer) error {
 	_, err := fmt.Fprintf(w, `    flags=()
     two_word_flags=()
+    local_nonpersistent_flags=()
     flags_with_completion=()
     flags_completion=()
 
@@ -397,6 +418,7 @@ func writeFlags(cmd *Command, w io.Writer) error {
 	if err != nil {
 		return err
 	}
+	localNonPersistentFlags := cmd.LocalNonPersistentFlags()
 	var visitErr error
 	cmd.NonInheritedFlags().VisitAll(func(flag *pflag.Flag) {
 		if err := writeFlag(flag, w); err != nil {
@@ -409,6 +431,12 @@ func writeFlags(cmd *Command, w io.Writer) error {
 				return
 			}
 		}
+		if localNonPersistentFlags.Lookup(flag.Name) != nil {
+			if err := writeLocalNonPersistentFlag(flag, w); err != nil {
+				visitErr = err
+				return
+			}
+		}
 	})
 	if visitErr != nil {
 		return visitErr

command.go

@@ -1025,6 +1025,19 @@ func (c *Command) Flags() *flag.FlagSet {
 	return c.flags
 }
 
+// LocalNonPersistentFlags are flags specific to this command which will NOT persist to subcommands
+func (c *Command) LocalNonPersistentFlags() *flag.FlagSet {
+	persistentFlags := c.PersistentFlags()
+
+	out := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
+	c.LocalFlags().VisitAll(func(f *flag.Flag) {
+		if persistentFlags.Lookup(f.Name) == nil {
+			out.AddFlag(f)
+		}
+	})
+	return out
+}
+
 // Get the local FlagSet specifically set in the current command
 func (c *Command) LocalFlags() *flag.FlagSet {
 	c.mergePersistentFlags()