os: add an .exit_code field to os.Command (#13321)

* Added os.Command.exit_code

* vfmt vlib/os/os_test.v

* extract os.Command to os.v, add a dummy panicing implementation on windows, just for parity, fix os_test.v on macos, skip test_command on windows.

Co-authored-by: Merlin Diavova <md@merlindiaova.org>
Co-authored-by: Delyan Angelov <delian66@gmail.com>

vlib/os/os.v

@@ -24,6 +24,17 @@ pub:
 	// stderr string // TODO
 }
 
+pub struct Command {
+mut:
+	f voidptr
+pub mut:
+	eof       bool
+	exit_code int
+pub:
+	path            string
+	redirect_stdout bool
+}
+
 [unsafe]
 pub fn (mut result Result) free() {
 	unsafe { result.output.free() }

vlib/os/os_nix.c.v

@@ -364,16 +364,6 @@ pub fn execute(cmd string) Result {
 	}
 }
 
-pub struct Command {
-mut:
-	f voidptr
-pub mut:
-	eof bool
-pub:
-	path            string
-	redirect_stdout bool
-}
-
 [manualfree]
 pub fn (mut c Command) start() ? {
 	pcmd := c.path + ' 2>&1'
@@ -412,9 +402,9 @@ pub fn (mut c Command) read_line() string {
 	return final
 }
 
-pub fn (c &Command) close() ? {
-	exit_code := vpclose(c.f)
-	if exit_code == 127 {
+pub fn (mut c Command) close() ? {
+	c.exit_code = vpclose(c.f)
+	if c.exit_code == 127 {
 		return error_with_code('error', 127)
 	}
 }

vlib/os/os_test.v

@@ -861,3 +861,36 @@ fn test_execute() ? {
 	assert hexresult.starts_with('7374617274004d4944444c450066696e697368')
 	assert hexresult.ends_with('0a7878')
 }
+
+fn test_command() {
+	if os.user_os() == 'windows' {
+		eprintln('>>> os.Command is not implemented fully on Windows yet')
+		return
+	}
+	mut cmd := os.Command{
+		path: 'ls'
+	}
+
+	cmd.start() or { panic(err) }
+	for !cmd.eof {
+		cmd.read_line()
+	}
+
+	cmd.close() or { panic(err) }
+	// dump( cmd )
+	assert cmd.exit_code == 0
+
+	// This will return a non 0 code
+	mut cmd_to_fail := os.Command{
+		path: 'ls -M'
+	}
+
+	cmd_to_fail.start() or { panic(err) }
+	for !cmd_to_fail.eof {
+		cmd_to_fail.read_line()
+	}
+
+	cmd_to_fail.close() or { panic(err) }
+	// dump( cmd_to_fail )
+	assert cmd_to_fail.exit_code != 0 // 2 on linux, 1 on macos
+}

vlib/os/os_windows.c.v

@@ -543,3 +543,17 @@ pub fn getegid() int {
 pub fn posix_set_permission_bit(path_s string, mode u32, enable bool) {
 	// windows has no concept of a permission mask, so do nothing
 }
+
+//
+
+pub fn (mut c Command) start() ? {
+	panic('not implemented')
+}
+
+pub fn (mut c Command) read_line() string {
+	panic('not implemented')
+}
+
+pub fn (mut c Command) close() ? {
+	panic('not implemented')
+}