llgo/_demo/c/cargs/demo.go

package main

import (
	"fmt"
	"os"
	_ "unsafe"

	"github.com/goplus/lib/c"
)

const LLGoPackage string = "link: $(pkg-config --libs cargs);"

type Option struct {
	Identifier    c.Char
	AccessLetters *c.Char
	AccessName    *c.Char
	ValueName     *c.Char
	Description   *c.Char
}

type OptionContext struct {
	Options     *Option
	OptionCount c.SizeT
	Argc        c.Int
	Argv        **c.Char
	Index       c.Int
	InnerIndex  c.Int
	ErrorIndex  c.Int
	ErrorLetter c.Char
	ForcedEnd   bool
	Identifier  c.Char
	Value       *c.Char
}

// llgo:type C
type Printer func(__llgo_arg_0 c.Pointer, __llgo_arg_1 *c.Char, __llgo_va_list ...interface{}) c.Int

// llgo:link (*OptionContext).OptionInit C.cag_option_init
func (recv_ *OptionContext) OptionInit(options *Option, option_count c.SizeT, argc c.Int, argv **c.Char) {
}

// llgo:link (*OptionContext).OptionFetch C.cag_option_fetch
func (recv_ *OptionContext) OptionFetch() bool {
	return false
}

// llgo:link (*OptionContext).OptionGetIdentifier C.cag_option_get_identifier
func (recv_ *OptionContext) OptionGetIdentifier() c.Char {
	return 0
}

// llgo:link (*OptionContext).OptionGetValue C.cag_option_get_value
func (recv_ *OptionContext) OptionGetValue() *c.Char {
	return nil
}

// llgo:link (*OptionContext).OptionGetIndex C.cag_option_get_index
func (recv_ *OptionContext) OptionGetIndex() c.Int {
	return 0
}

// llgo:link (*OptionContext).OptionGetErrorIndex C.cag_option_get_error_index
func (recv_ *OptionContext) OptionGetErrorIndex() c.Int {
	return 0
}

// llgo:link (*OptionContext).OptionGetErrorLetter C.cag_option_get_error_letter
func (recv_ *OptionContext) OptionGetErrorLetter() c.Char {
	return 0
}

// llgo:link (*OptionContext).OptionPrintError C.cag_option_print_error
func (recv_ *OptionContext) OptionPrintError(destination *c.FILE) {
}

// llgo:link (*OptionContext).OptionPrinterError C.cag_option_printer_error
func (recv_ *OptionContext) OptionPrinterError(printer Printer, printer_ctx c.Pointer) {
}

// llgo:link (*Option).OptionPrint C.cag_option_print
func (recv_ *Option) OptionPrint(option_count c.SizeT, destination *c.FILE) {
}

// llgo:link (*Option).OptionPrinter C.cag_option_printer
func (recv_ *Option) OptionPrinter(option_count c.SizeT, printer Printer, printer_ctx c.Pointer) {
}

// llgo:link (*OptionContext).OptionPrepare C.cag_option_prepare
func (recv_ *OptionContext) OptionPrepare(options *Option, option_count c.SizeT, argc c.Int, argv **c.Char) {
}

// llgo:link (*OptionContext).OptionGet C.cag_option_get
func (recv_ *OptionContext) OptionGet() c.Char {
	return 0
}

func main() {
	options := []Option{
		{
			Identifier:    'h',
			AccessLetters: c.Str("h"),
			AccessName:    c.Str("help"),
			ValueName:     nil,
			Description:   c.Str("Show help information"),
		},
		{
			Identifier:    'v',
			AccessLetters: c.Str("v"),
			AccessName:    c.Str("version"),
			ValueName:     nil,
			Description:   c.Str("Show version information"),
		},
	}

	args := os.Args

	// Convert Go string array to C-style argv
	argv := make([]*int8, len(args))
	for i, arg := range args {
		argv[i] = c.AllocaCStr(arg)
	}

	// Initialize option context
	var context OptionContext
	context.OptionInit(&options[0], uintptr(len(options)), c.Int(len(args)), &argv[0])

	// Process all options
	identifierFound := false
	for context.OptionFetch() {
		identifierFound = true
		identifier := context.OptionGetIdentifier()
		switch identifier {
		case 'h':
			fmt.Println("Help: This is a simple command-line parser demo")
		case 'v':
			fmt.Println("Version: 1.0.0")
		}
	}

	// Default output if no identifier is found
	if !identifierFound {
		fmt.Println("Demo Command-line Tool\nIdentifier:\n\t-h: Help\n\t-v: Version")
	}
}