vlib: cli module

examples/cli.v

@@ -0,0 +1,50 @@
+module main
+
+import (
+	cli
+	os
+)
+
+fn main() {
+	mut cmd := cli.Command{
+		name: 'cli', 
+		description: 'An example of the cli library',
+		version: '1.0.0',
+	}
+
+	mut greet_cmd := cli.Command{
+		name: 'greet',
+		description: 'Prints greeting in different languages',
+		execute: greet_func,
+	}
+	greet_cmd.add_flag(cli.Flag{
+		flag: .string, 
+		required: true,
+		name: 'language',
+		abbrev: 'l',
+		description: 'Language of the message'
+	})
+	greet_cmd.add_flag(cli.Flag{
+		flag: .int,
+		name: 'times',
+		value: '3',
+		description: 'Number of times the message gets printed'
+	})
+
+	cmd.add_command(greet_cmd)
+	cmd.parse(os.args)
+}
+
+fn greet_func(cmd cli.Command) {
+	language := cmd.flags.get_string('language') or { panic('failed to get \'language\' flag: $err') }
+	times := cmd.flags.get_int('times') or { panic('failed to get \'times\' flag: $err') }
+
+	for i := 0; i < times; i++ {
+		match language {
+			'english' { println('Hello World') }
+			'german' { println('Hallo Welt') }
+			'dutch' { println('Hallo Wereld') }
+			else { println('unsupported language') }
+		}
+	}
+}