cli: assign parent by default; add disable_flag

examples/cli.v

@@ -8,7 +8,6 @@ fn main() {
 		name: 'cli',
 		description: 'An example of the cli library',
 		version: '1.0.0',
-		parent: 0
 	}
 
 	mut greet_cmd := cli.Command{
@@ -17,7 +16,6 @@ fn main() {
 		pre_execute: greet_pre_func,
 		execute: greet_func,
 		post_execute: greet_post_func,
-		parent: 0
 	}
 	greet_cmd.add_flag(cli.Flag{
 		flag: .string,
@@ -46,7 +44,10 @@ fn greet_func(cmd cli.Command) {
 			'english' { println('Hello World') }
 			'german' { println('Hallo Welt') }
 			'dutch' { println('Hallo Wereld') }
-			else { println('unsupported language') }
+			else { 
+				println('unsupported language')
+				break 
+			}
 		}
 	}
 }

vlib/cli/command.v

@@ -1,20 +1,21 @@
 module cli
 
-type CallbackFn fn(cmd Command)
+fn nil() voidptr { return 0 }
 
 pub struct Command {
 pub mut:
 	name string
 	description string
 	version string
-	pre_execute CallbackFn
-	execute CallbackFn
-	post_execute CallbackFn
+	pre_execute fn(cmd Command)
+	execute fn(cmd Command)
+	post_execute fn(cmd Command)
 
 	disable_help bool
 	disable_version bool
+	disable_flags bool
 
-	parent &Command
+	parent &Command = nil()
 	commands []Command
 	flags []Flag
 	args []string
@@ -43,7 +44,9 @@ pub fn (mut cmd Command) add_flag(flag Flag) {
 }
 
 pub fn (mut cmd Command) parse(args []string) {
+	if !cmd.disable_flags {
 		cmd.add_default_flags()
+	}
 	cmd.add_default_commands()
 
 	cmd.args = args[1..]
@@ -51,7 +54,9 @@ pub fn (mut cmd Command) parse(args []string) {
 		cmd.commands[i].parent = cmd
 	}
 
+	if !cmd.disable_flags {
 		cmd.parse_flags()
+	}
 	cmd.parse_commands()
 }
 

vlib/cli/help.v

@@ -23,7 +23,6 @@ fn help_cmd() Command {
 		name: 'help',
 		description: 'Prints help information',
 		execute: help_func,
-		parent: 0
 	}
 }
 

vlib/cli/version.v

@@ -14,7 +14,6 @@ fn version_cmd() Command {
 		name: 'version'
 		description: 'Prints version information',
 		execute: version_func,
-		parent: 0
 	}
 }