commit 195b96733167577f341e2959ed9f10dbc0133ccc
Author: ren yuze <i@b612.me>
Date:   Wed Jan 13 10:08:08 2021 +0800

    init

diff --git a/circle.go b/circle.go
new file mode 100644
index 0000000..22caa0c
--- /dev/null
+++ b/circle.go
@@ -0,0 +1,128 @@
+package stario
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"sync"
+	"time"
+)
+
+type StarBuffer struct {
+	io.Reader
+	io.Writer
+	io.Closer
+	datas   []byte
+	pStart  int
+	pEnd    int
+	cap     int
+	isClose bool
+	isEnd   bool
+	rmu     sync.Mutex
+	wmu     sync.Mutex
+}
+
+func NewStarBuffer(cap int) *StarBuffer {
+	rtnBuffer := new(StarBuffer)
+	rtnBuffer.cap = cap
+	rtnBuffer.datas = make([]byte, cap)
+	return rtnBuffer
+}
+
+func (star *StarBuffer) Free() int {
+	return star.cap - star.Len()
+}
+
+func (star *StarBuffer) Cap() int {
+	return star.cap
+}
+
+func (star *StarBuffer) Len() int {
+	length := star.pEnd - star.pStart
+	if length < 0 {
+		return star.cap + length - 1
+	}
+	return length
+}
+
+func (star *StarBuffer) getByte() (byte, error) {
+	if star.isClose || (star.isEnd && star.Len() == 0) {
+		return 0, io.EOF
+	}
+	if star.Len() == 0 {
+		return 0, errors.New("no byte available now")
+	}
+	data := star.datas[star.pStart]
+	star.pStart++
+	if star.pStart == star.cap {
+		star.pStart = 0
+	}
+	return data, nil
+}
+
+func (star *StarBuffer) putByte(data byte) error {
+	if star.isClose || star.isEnd {
+		return io.EOF
+	}
+	kariEnd := star.pEnd + 1
+	if kariEnd == star.cap {
+		kariEnd = 0
+	}
+	if kariEnd == star.pStart {
+		for {
+			time.Sleep(time.Microsecond)
+			if kariEnd != star.pStart {
+				break
+			}
+		}
+	}
+	star.datas[star.pEnd] = data
+	star.pEnd = kariEnd
+	return nil
+}
+func (star *StarBuffer) Close() error {
+	star.isClose = true
+	return nil
+}
+func (star *StarBuffer) Read(buf []byte) (int, error) {
+	if star.isClose {
+		return 0, io.EOF
+	}
+	if buf == nil {
+		return 0, errors.New("buffer is nil")
+	}
+	star.rmu.Lock()
+	defer star.rmu.Unlock()
+	var sum int = 0
+	for i := 0; i < len(buf); i++ {
+		data, err := star.getByte()
+		if err != nil {
+			if err == io.EOF {
+				return sum, err
+			}
+			return sum, nil
+		}
+		buf[i] = data
+		sum++
+	}
+	return sum, nil
+}
+
+func (star *StarBuffer) Write(bts []byte) (int, error) {
+	if bts == nil || star.isClose {
+		star.isEnd = true
+		return 0, io.EOF
+	}
+	star.wmu.Lock()
+	defer star.wmu.Unlock()
+	var sum = 0
+	for i := 0; i < len(bts); i++ {
+		err := star.putByte(bts[i])
+		if err != nil {
+			fmt.Println("Write bts err:", err)
+			return sum, err
+		}
+		sum++
+	}
+	return sum, nil
+}
diff --git a/io.go b/io.go
new file mode 100644
index 0000000..dcd9018
--- /dev/null
+++ b/io.go
@@ -0,0 +1,151 @@
+package stario
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+type InputMsg struct {
+	msg string
+	err error
+}
+
+func MessageBox(hint string, defaultVal string) InputMsg {
+	if hint != "" {
+		fmt.Print(hint)
+	}
+	inputReader := bufio.NewReader(os.Stdin)
+	str, err := inputReader.ReadString('\n')
+	if err != nil {
+		return InputMsg{"", err}
+	}
+	return InputMsg{strings.TrimSpace(str), nil}
+}
+
+func (im InputMsg) String() (string, error) {
+	if im.err != nil {
+		return "", im.err
+	}
+	return im.msg, nil
+}
+
+func (im InputMsg) MustString() string {
+	res, _ := im.String()
+	return res
+}
+
+func (im InputMsg) Int() (int, error) {
+	if im.err != nil {
+		return 0, im.err
+	}
+	return strconv.Atoi(im.msg)
+}
+
+func (im InputMsg) MustInt() int {
+	res, _ := im.Int()
+	return res
+}
+
+func (im InputMsg) Int64() (int64, error) {
+	if im.err != nil {
+		return 0, im.err
+	}
+	return strconv.ParseInt(im.msg, 10, 64)
+}
+
+func (im InputMsg) MustInt64() int64 {
+	res, _ := im.Int64()
+	return res
+}
+
+func (im InputMsg) Uint64() (uint64, error) {
+	if im.err != nil {
+		return 0, im.err
+	}
+	return strconv.ParseUint(im.msg, 10, 64)
+}
+
+func (im InputMsg) MustUint64() uint64 {
+	res, _ := im.Uint64()
+	return res
+}
+
+func (im InputMsg) Bool() (bool, error) {
+	if im.err != nil {
+		return false, im.err
+	}
+	return strconv.ParseBool(im.msg)
+}
+
+func (im InputMsg) MustBool() bool {
+	res, _ := im.Bool()
+	return res
+}
+
+func (im InputMsg) Float64() (float64, error) {
+	if im.err != nil {
+		return 0, im.err
+	}
+	return strconv.ParseFloat(im.msg, 64)
+}
+
+func (im InputMsg) MustFloat64() float64 {
+	res, _ := im.Float64()
+	return res
+}
+
+func (im InputMsg) Float32() (float32, error) {
+	if im.err != nil {
+		return 0, im.err
+	}
+	res, err := strconv.ParseFloat(im.msg, 32)
+	return float32(res), err
+}
+
+func (im InputMsg) MustFloat32() float32 {
+	res, _ := im.Float32()
+	return res
+}
+
+func YesNo(hint string, defaults bool) bool {
+	res := strings.ToUpper(MessageBox(hint, "").MustString())
+	if res == "" {
+		return defaults
+	}
+	res = res[0:1]
+	if res == "Y" {
+		return true
+	} else if res == "N" {
+		return false
+	} else {
+		return defaults
+	}
+}
+
+func StopUntil(hint string, trigger string) error {
+	pressLen := len(trigger)
+	if trigger == "" {
+		pressLen = 1
+	} else {
+		pressLen = len(trigger)
+	}
+	ioBuf := make([]byte, pressLen)
+	for {
+		if hint != "" {
+			fmt.Print(hint)
+		}
+		inputReader := bufio.NewReader(os.Stdin)
+		_, err := inputReader.Read(ioBuf)
+		if err != nil {
+			return err
+		}
+		if string(ioBuf) == trigger || trigger == "" {
+			break
+		}
+		fmt.Print("\n")
+	}
+	return nil
+}