Go进阶19:如何开发多彩动感的终端UI应用

package main
import "fmt"
func main() {
   fmt.Print("\x1b[4;30;46m")//设置颜色样式
   fmt.Print("Hello World")//打印文本内容
   fmt.Println("\x1b[0m")//样式结束符,清楚之前的显示属性
}

package main

import (
	"fmt"
	"strings"
	"time"
)

func renderbar(count, total int) {
	barwidth := 30
	done := int(float64(barwidth) * float64(count) / float64(total))

	fmt.Printf("Progress: \x1b[33m%3d%%\x1b[0m ", count*100/total)
	fmt.Printf("[%s%s]",
		strings.Repeat("=", done),
		strings.Repeat("-", barwidth-done))
}

func main() {
	total := 50
	for i := 1; i <= total; i++ {
		//<ESC>表示ASCII“转义”字符,0x1B
		fmt.Print("\x1b7")   // 保存光标位置 保存光标和Attrs <ESC> 7
		fmt.Print("\x1b[2k") // 清空当前行的内容 擦除线<ESC> [2K
		renderbar(i, total)
		time.Sleep(50 * time.Millisecond)
		fmt.Print("\x1b8") // 恢复光标位置 恢复光标和Attrs <ESC> 8
	}
	fmt.Println()
}

type winsize struct {
   Row uint16
   Col uint16
   X  uint16
   Y uint16
}

func getWinSize(fd int) (row, col uint16, err error) {
   var ws *winsize
   retCode, _, errno := syscall.Syscall(
      syscall.SYS_IOCTL, uintptr(fd),
      uintptr(syscall.TIOCGWINSZ),
      uintptr(unsafe.Pointer(ws)))
   if int(retCode) == -1 {
      panic(errno)
   }
   return ws.Row, ws.Col, nil
}

package main

import (
	"fmt"
	"strings"
	"syscall"
	"time"

	"golang.org/x/sys/unix"
)

var wscol = 30

func init() {
	ws, err := unix.IoctlGetWinsize(syscall.Stdout, unix.TIOCGWINSZ)
	if err != nil {
		panic(err)
	}
	wscol = int(ws.Col)
}

func renderbar(count, total int) {
	barwidth := wscol - len("Progress: 100% []")
	done := int(float64(barwidth) * float64(count) / float64(total))

	fmt.Printf("Progress: \x1b[33m%3d%%\x1b[0m ", count*100/total)
	fmt.Printf("[%s%s]",
		strings.Repeat("=", done),
		strings.Repeat("-", barwidth-done))
}

func main() {
	total := 50
	for i := 1; i <= total; i++ {
		fmt.Print("\x1b7")   // save the cursor position
		fmt.Print("\x1b[2k") // erase the current line
		renderbar(i, total)
		time.Sleep(50 * time.Millisecond)
		fmt.Print("\x1b8") // restore the cursor position
	}
	fmt.Println()
}

package main

import (
	"fmt"
	"os"
	"os/signal"
	"strings"
	"syscall"
	"time"

	"golang.org/x/sys/unix"
)

var (
	total = 50
	count = 0
	wscol = 20
)

func init() {
	err := updateWSCol()
	if err != nil {
		panic(err)
	}
}

func updateWSCol() error {
	ws, err := unix.IoctlGetWinsize(syscall.Stdout, unix.TIOCGWINSZ)
	if err != nil {
		return err
	}
	wscol = int(ws.Col)
	return nil
}

func renderbar() {
	fmt.Print("\x1b7")       // 保存光标位置
	fmt.Print("\x1b[2k")     // 清除当前行内容
	defer fmt.Print("\x1b8") // 恢复光标位置

	barwidth := wscol - len("Progress: 100% []")
	done := int(float64(barwidth) * float64(count) / float64(total))

	fmt.Printf("Progress: \x1b[33m%3d%%\x1b[0m ", count*100/total)
	fmt.Printf("[%s%s]",
		strings.Repeat("=", done),
		strings.Repeat("-", barwidth-done))
}

func main() {
	// set signal handler
	sigwinch := make(chan os.Signal, 1)
	defer close(sigwinch)
	signal.Notify(sigwinch, syscall.SIGWINCH)
	go func() {
		for {
			if _, ok := <-sigwinch; !ok {
				return
			}
			_ = updateWSCol()
			renderbar()
		}
	}()

	for count = 1; count <= 50; count++ {
		renderbar()
		time.Sleep(time.Second)
	}
	fmt.Println()
}