add search validate+explain (#31)

cmd/root.go

@@ -83,12 +83,6 @@ func Main() int {
 				Usage:       "output mode (tsv, markdown, json, yaml) default: tsv",
 				Destination: &conf.Output,
 			},
-			&cli.BoolFlag{
-				Name:        "help-jsonpath",
-				Usage:       "show jsonPath help",
-				Destination: &conf.Subhelp,
-				Aliases:     []string{"H"},
-			},
 		},
 
 		Commands: []*cli.Command{
@@ -104,6 +98,7 @@ func Main() int {
 			Version(conf),
 			Debug(conf),
 			Roles(conf),
+			HelpJsonPath(conf),
 		},
 
 		Before: func(ctx context.Context, cmd *cli.Command) (context.Context, error) {
@@ -125,6 +120,45 @@ func Main() int {
 	return Finish(cmd.Run(context.Background(), os.Args))
 }
 
+func HelpJsonPath(conf *cfg.Config) *cli.Command {
+	msg := `jsonPath usage:
+
+name.last          >> "Anderson"
+age                >> 37
+children           >> ["Sara","Alex","Jack"]
+children.#         >> 3
+children.1         >> "Alex"
+child*.2           >> "Jack"
+c?ildren.0         >> "Sara"
+fav\.movie         >> "Deer Hunter"
+friends.#.first    >> ["Dale","Roger","Jane"]
+friends.1.last     >> "Craig"
+
+You can also  query an array for  the first match by  using #(...), or
+find all matches  with #(...)#. Queries support the ==,  !=, <, <=, >,
+>= comparison operators  and the simple pattern matching  % (like) and
+!% (not like) operators. Eg:
+
+friends.#(last=="Murphy").first    >> "Dale"
+friends.#(last=="Murphy")#.first   >> ["Dale","Jane"]
+friends.#(age>45)#.last            >> ["Craig","Murphy"]
+friends.#(first%"D*").last         >> "Murphy"
+friends.#(first!%"D*").last        >> "Craig"
+friends.#(nets.#(=="fb"))#.first   >> ["Dale","Roger"]
+
+Documentation: https://github.com/tidwall/gjson/blob/master/SYNTAX.md`
+
+	return &cli.Command{
+		Name:  "help-jsonpath",
+		Usage: "show jsonpath help",
+
+		Action: func(ctx context.Context, cmd *cli.Command) error {
+			_, err := fmt.Println(msg)
+			return err
+		},
+	}
+}
+
 func Version(conf *cfg.Config) *cli.Command {
 	return &cli.Command{
 		Name:  "version",