cli: fix default flags when their command equivalents are disabled (#21469)

* always replace `\r\n` with `\n`

* fix

* test

* cleanup

* add doc comment

vlib/cli/cli_test.v

@@ -19,12 +19,8 @@ fn test_cli_programs() {
 			has_err = true
 			continue
 		}
-		mut expected_out := os.read_file(out_path)!
-		mut test_out := os.execute('${vexe} run ${test}').output
-		$if windows {
-			expected_out = expected_out.replace('\r\n', '\n')
-			test_out = test_out.replace('\r\n', '\n')
-		}
+		expected_out := os.read_file(out_path)!.replace('\r\n', '\n')
+		test_out := os.execute('${vexe} run ${test}').output.replace('\r\n', '\n')
 		diff_ := diff.compare_text(expected_out, test_out)!
 		if diff_ != '' {
 			println(term.red('FAIL'))

vlib/cli/command.v

@@ -341,8 +341,7 @@ fn (cmd Command) check_version_flag() {
 	if cmd.defaults.parsed.version.flag && cmd.version != '' && cmd.flags.contains('version') {
 		version_flag := cmd.flags.get_bool('version') or { return } // ignore error and handle command normally
 		if version_flag {
-			version_cmd := cmd.commands.get('version') or { return } // ignore error and handle command normally
-			version_cmd.execute(version_cmd) or { panic(err) }
+			print_version_for_command(cmd) or { panic(err) }
 			exit(0)
 		}
 	}

vlib/cli/testdata/default_command_no_flag_err.out

@@ -0,0 +1 @@
+Command `foo` has no flag `-man`

vlib/cli/testdata/default_command_no_flag_err.vv

@@ -0,0 +1,11 @@
+import cli { Command, CommandFlag }
+
+fn main() {
+	mut cmd := Command{
+		name: 'foo'
+		defaults: struct {
+			man: CommandFlag{true, false}
+		}
+	}
+	cmd.parse(['foo', '-man'])
+}

vlib/cli/testdata/default_help_flag_no_command.out

@@ -0,0 +1,8 @@
+Usage: foo [flags] [commands]
+
+Flags:
+  -help               Prints help information.
+  -man                Prints the auto-generated manpage.
+
+Commands:
+  man                 Prints the auto-generated manpage.

vlib/cli/testdata/default_help_flag_no_command.vv

@@ -0,0 +1,11 @@
+import cli { Command, CommandFlag }
+
+fn main() {
+	mut cmd := Command{
+		name: 'foo'
+		defaults: struct {
+			help: CommandFlag{false, true}
+		}
+	}
+	cmd.parse(['foo', '-help'])
+}

vlib/cli/testdata/default_version_flag_no_command.out

@@ -0,0 +1 @@
+foo version 0.1.0

vlib/cli/testdata/default_version_flag_no_command.vv

@@ -0,0 +1,13 @@
+import cli { Command, CommandFlag }
+
+fn main() {
+	mut cmd := Command{
+		name: 'foo'
+		version: '0.1.0'
+		posix_mode: true
+		defaults: struct {
+			version: CommandFlag{false, true}
+		}
+	}
+	cmd.parse(['foo', '--version'])
+}

vlib/cli/version.v

@@ -14,12 +14,28 @@ fn version_cmd() Command {
 	return Command{
 		name: 'version'
 		description: 'Prints version information.'
-		execute: version_func
+		execute: print_version_for_command
 	}
 }
 
-fn version_func(version_cmd Command) ! {
-	cmd := version_cmd.parent
-	version := '${cmd.name} version ${cmd.version}'
-	println(version)
+fn print_version_for_command(cmd Command) ! {
+	if cmd.args.len > 0 {
+		for sub_cmd in cmd.commands {
+			if sub_cmd.name == cmd.args[0] {
+				version_cmd := unsafe { &sub_cmd }
+				print(version_cmd.version())
+				return
+			}
+		}
+		println('Invalid command: ${cmd.args.join(' ')}')
+	} else if cmd.parent != unsafe { nil } {
+		println(cmd.parent.version())
+	} else {
+		println(cmd.version())
+	}
+}
+
+// version returns a generated version `string` for the `Command`.
+pub fn (cmd Command) version() string {
+	return '${cmd.name} version ${cmd.version}'
 }