zsh-completion: two fixes for identifying flag usage:

Fixed after input from @eparis:
- Decide on option parameter by checking NoOptDefVal
- Slices also could be specified multiple times.

zsh_completions.go

@@ -131,7 +131,7 @@ func genFlagEntryForZshArguments(f *pflag.Flag) string {
 func genFlagEntryForSingleOptionFlag(f *pflag.Flag) string {
 	var option, multiMark, extras string
 
-	if f.Value.Type() == "stringArray" {
+	if flagCouldBeSpecifiedMoreThenOnce(f) {
 		multiMark = "*"
 	}
 
@@ -147,7 +147,7 @@ func genFlagEntryForSingleOptionFlag(f *pflag.Flag) string {
 func genFlagEntryForMultiOptionFlag(f *pflag.Flag) string {
 	var options, parenMultiMark, curlyMultiMark, extras string
 
-	if f.Value.Type() == "stringArray" {
+	if flagCouldBeSpecifiedMoreThenOnce(f) {
 		parenMultiMark = "*"
 		curlyMultiMark = "\\*"
 	}
@@ -165,9 +165,14 @@ func genZshFlagEntryExtras(f *pflag.Flag) string {
 	_, pathSpecified := f.Annotations[BashCompFilenameExt]
 	if pathSpecified {
 		extras = ":filename:_files"
-	} else if !strings.HasPrefix(f.Value.Type(), "bool") {
+	} else if f.NoOptDefVal == "" {
 		extras = ":" // allow option variable without assisting
 	}
 
 	return extras
 }
+
+func flagCouldBeSpecifiedMoreThenOnce(f *pflag.Flag) bool {
+	return strings.Contains(f.Value.Type(), "Slice") ||
+		strings.Contains(f.Value.Type(), "Array")
+}

zsh_completions_test.go

@@ -15,6 +15,7 @@ func TestGenZshCompletion(t *testing.T) {
 		name                string
 		root                *Command
 		expectedExpressions []string
+		skip                string
 	}{
 		{
 			name: "simple command",
@@ -99,7 +100,7 @@ func TestGenZshCompletion(t *testing.T) {
 			name: "repeated variables both with and without value",
 			root: func() *Command {
 				r := genTestCommand("mycmd", true)
-				_ = r.Flags().StringArrayP("debug", "d", []string{}, "debug usage")
+				_ = r.Flags().BoolSliceP("debug", "d", []bool{}, "debug usage")
 				_ = r.Flags().StringArray("option", []string{}, "options")
 				return r
 			}(),
@@ -108,6 +109,18 @@ func TestGenZshCompletion(t *testing.T) {
 				`"\(\*-d \*--debug\)"{\\\*-d,\\\*--debug}`,
 			},
 		},
+		{
+			name: "boolSlice should not accept arguments",
+			root: func() *Command {
+				r := genTestCommand("mycmd", true)
+				r.Flags().BoolSlice("verbose", []bool{}, "verbosity level")
+				return r
+			}(),
+			expectedExpressions: []string{
+				`"\*--verbose\[verbosity level]"`,
+			},
+			skip: "BoolSlice behaves strangely both with NoOptDefVal and type (identifies as bool)",
+		},
 	}
 
 	for _, tc := range tcs {
@@ -119,6 +132,10 @@ func TestGenZshCompletion(t *testing.T) {
 			}
 			output := buf.Bytes()
 
+			if tc.skip != "" {
+				t.Skip("Skipping:", tc.skip)
+			}
+
 			for _, expr := range tc.expectedExpressions {
 				rgx, err := regexp.Compile(expr)
 				if err != nil {