add CheckPrinter

.gitignore

@@ -30,3 +30,4 @@ assets
 libgofunc
 libgo
 cmd/out.png
+cmd/*.png

build_lib.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 APP_NAME="libgofunc"
-VERSION="${1:-v0.1.7}"
+VERSION="${1:-v0.1.12}"
 OUTPUT_DIR="../assets"
 BUILD_DIR="../build"
 

go.mod

@@ -12,5 +12,6 @@ require (
 
 require (
 	github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 // indirect
+	github.com/google/uuid v1.6.0
 	golang.org/x/text v0.35.0 // indirect
 )

go.sum

@@ -4,6 +4,8 @@ github.com/fogleman/gg v1.3.0 h1:/7zJX8F6AaYQc57WQCyN9cAIz+4bCJGO9B+dyW29am8=
 github.com/fogleman/gg v1.3.0/go.mod h1:R/bRT+9gY/C5z7JzPU0zXsXHKM4/ayA+zqcVNZzPa1k=
 github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 h1:DACJavvAHhabrF08vX0COfcOBJRhZ8lUbR+ZWIs0Y5g=
 github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0/go.mod h1:E/TSTwGwJL78qG/PmXZO1EjYhfJinVAhrmmHX6Z8B9k=
+github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
+github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/kenshaw/escpos v0.0.0-20221114190919-df06b682a8fc h1:4JwmN2Scz1vR+hfSxkdy2IE/DzxX2Cftm2lhWHyN0k0=
 github.com/kenshaw/escpos v0.0.0-20221114190919-df06b682a8fc/go.mod h1:M+GIBmg2MqaSWIJrXCZS+/wRFbr9fOguRz3SHn8DRPE=
 golang.org/x/image v0.38.0 h1:5l+q+Y9JDC7mBOMjo4/aPhMDcxEptsX+Tt3GgRQRPuE=

img.go

@@ -14,6 +14,7 @@ import (
 	"strings"
 
 	"embed"
+	_ "time/tzdata"
 
 	"github.com/fogleman/gg"
 	"golang.org/x/image/font"
@@ -21,14 +22,14 @@ import (
 	"golang.org/x/net/html"
 
 	"encoding/json"
-
-	"github.com/kenshaw/escpos"
 )
 import (
 	"log"
 	"path"
 	"strconv"
+	"time"
 
+	"github.com/google/uuid"
 	"golang.org/x/text/language"
 	"golang.org/x/text/message"
 )
@@ -47,9 +48,9 @@ const (
 var fontFs embed.FS
 
 //export GenPNG
-func GenPNG(width C.int, outputPath *C.char, payload *C.char, tmpl *C.char, workingDirC *C.char) *C.char {
+func GenPNG(width C.int, outDir *C.char, payload *C.char, tmpl *C.char, workingDirC *C.char) *C.char {
 	canvasWidth := int(width)
-	goPath := C.GoString(outputPath)
+	goOutDir := C.GoString(outDir)
 	goPayload := C.GoString(payload)
 	goTmpl := C.GoString(tmpl)
 	workingDir := C.GoString(workingDirC)
@@ -66,14 +67,27 @@ func GenPNG(width C.int, outputPath *C.char, payload *C.char, tmpl *C.char, work
 	}
 
 	htmlStr = uni2zg(htmlStr)
-	root, err := html.Parse(strings.NewReader(htmlStr))
+	htmls := strings.Split(htmlStr, "<cut>")
+	result := make([]string, 0)
+	for _, html := range htmls {
+		out, err := GenPng(canvasWidth, goOutDir, html, workingDir)
 		if err != nil {
 			return NewErr(err)
 		}
+		result = append(result, out)
+	}
+	return NewOk(result)
+}
+
+func GenPng(canvasWidth int, outDir string, htmlStr string, workingDir string) (string, error) {
+	root, err := html.Parse(strings.NewReader(htmlStr))
+	if err != nil {
+		return "", err
+	}
 
 	face, err := LoadFont(defalutFontSize)
 	if err != nil {
-		return NewErr(err)
+		return "", err
 	}
 
 	// First pass: compute required height
@@ -95,20 +109,19 @@ func GenPNG(width C.int, outputPath *C.char, payload *C.char, tmpl *C.char, work
 	y := 0
 	err = renderNode(dc, canvasWidth, body, &y, *face, workingDir)
 	if err != nil {
-		return NewErr(err)
+		return "", err
 	}
 
-	err = dc.SavePNG(goPath)
+	outPath := path.Join(outDir, uuid.NewString()+".png")
+	err = dc.SavePNG(outPath)
 	if err != nil {
-		return NewErr(err)
+		return "", err
+	}
+	return outPath, nil
 }
 
-	// PrintReceipt(goPath)
+func GenImg(width int, outputDir, payload, tmpl, workingDir string) string {
-	return NewOk(nil)
+	result := GenPNG(C.int(width), C.CString(outputDir), C.CString(payload), C.CString(tmpl), C.CString(workingDir))
-}
-
-func GenImg(width int, outputPath, payload, tmpl, workingDir string) string {
-	result := GenPNG(C.int(width), C.CString(outputPath), C.CString(payload), C.CString(tmpl), C.CString(workingDir))
 	r := C.GoString(result)
 	return r
 }
@@ -116,6 +129,7 @@ func GenImg(width int, outputPath, payload, tmpl, workingDir string) string {
 var funcMap = template.FuncMap{
 	"formatNumber":      FormatNumber,
 	"div":               Div,
+	"formatDateFromSec": formatDateFromSec,
 }
 
 func renderTemplate(tmp string, data map[string]interface{}) (string, error) {
@@ -160,7 +174,8 @@ func renderNode(dc *gg.Context, canvasWidth int, n *Node, y *int, face font.Face
 	if n.Style.PaddingBottom > 0 {
 		*y += int(n.Style.PaddingBottom)
 	}
-	log.Printf("render %s y, y', height:  %d, %d, %d\n", n.Tag, before, *y, *y-before)
+	_ = before
+	// log.Printf("render %s y, y', height:  %d, %d, %d\n", n.Tag, before, *y, *y-before)
 
 	for _, c := range n.Children {
 		renderNode(dc, canvasWidth, c, y, face, workingDir)
@@ -360,30 +375,25 @@ func findNode(n *html.Node, tag string) *html.Node {
 	return nil
 }
 
-func printImg(prt *escpos.Escpos, imgPath string) error {
+func imgData(imgPath string) ([]byte, error) {
 	imgFile, err := os.Open(imgPath)
 	if err != nil {
 		fmt.Println(err)
-		return err
+		return nil, err
 	}
 
 	img, _, err := image.Decode(imgFile)
 	defer imgFile.Close()
 	if err != nil {
 		fmt.Println(err)
-		return err
+		return nil, err
 	}
 	data := []byte{0x1D, 0x4C, 0x00, 0x00}
-	_, err = prt.WriteRaw(data)
-	if err != nil {
-		fmt.Println("error 0x1D, 0x4C:", err.Error())
-	}
 
 	gray := toMonochrome(img)
-	data = escposRaster(gray)
+	imgData := escposRaster(gray)
-
+	data = append(data, imgData...)
-	_, err = prt.WriteRaw(data)
+	return data, err
-	return err
 }
 
 func LoadFont(size float64) (*font.Face, error) {
@@ -451,7 +461,7 @@ func nodeHeight(n *html.Node, dc *gg.Context, canvasWidth int, xPadding, yPaddin
 			h = implicit
 		}
 		y += h
-		log.Printf("nodeHeight %s height: %d, \n", n.Data, y)
+		// log.Printf("nodeHeight %s height: %d, \n", n.Data, y)
 	}
 	return y
 }
@@ -518,3 +528,38 @@ func convertToFloat64(v any) float64 {
 		return 0
 	}
 }
+
+func formatDateFromSec(input any, layout string) string {
+	var sec int64
+	switch v := input.(type) {
+	case int64:
+		sec = v
+	case int:
+		sec = int64(v)
+	case float64:
+		sec = int64(v)
+	case float32:
+		sec = int64(v)
+	case string:
+		parsed, err := strconv.ParseInt(v, 10, 64)
+		if err != nil {
+			if parsedFloat, errFloat := strconv.ParseFloat(v, 64); errFloat == nil {
+				sec = int64(parsedFloat)
+			} else {
+				return fmt.Sprintf("[Error: invalid time string %q]", v)
+			}
+		} else {
+			sec = parsed
+		}
+	default:
+		return "[Error: unsupported time type]"
+	}
+	t := time.UnixMilli(sec * 1000)
+
+	loc, err := time.LoadLocation("Asia/Rangoon")
+	if err != nil {
+		return fmt.Sprintf("[Error: unable to load TZ  %v]", err)
+	}
+	t = t.In(loc)
+	return t.Format(layout)
+}

printer.go

@@ -15,92 +15,122 @@ import (
 
 	"time"
 
+	"errors"
+
 	"github.com/kenshaw/escpos"
 )
-import "errors"
+import "io"
 
 //export PrintImg
 func PrintImg(printer *C.char, imagePath *C.char) *C.char {
 	goPrinter := C.GoString(printer)
 	goImagePath := C.GoString(imagePath)
-	// printer := "tcp:192.168.100.151:9100"
+	err := Print(goPrinter, goImagePath)
-	// printer := "usb:/dev/usb/lp1"
-	var w *bufio.ReadWriter
-	if strings.HasPrefix(goPrinter, "tcp:") {
-		location := strings.TrimLeft(goPrinter, "tcp:")
-		conn, err := net.Dial("tcp", location)
 	if err != nil {
-			log.Println("error dialing:", err.Error())
 		return NewErr(err)
 	}
+	return NewOk(nil)
+}
+
+//export CheckPrinter
+func CheckPrinter(printer *C.char) *C.char {
+	goPrinter := C.GoString(printer)
+	err := Check(goPrinter)
+	if err != nil {
+		return NewErr(err)
+	}
+	return NewOk(nil)
+}
+
+func Print(printer, imagePath string) error {
+	conn, err := connect(printer)
+	if err != nil {
+		return err
+	}
 	defer conn.Close()
-		w = bufio.NewReadWriter(bufio.NewReader(conn), bufio.NewWriter(conn))
+	w := bufio.NewReadWriter(bufio.NewReader(conn), bufio.NewWriter(conn))
-	} else if strings.HasPrefix(goPrinter, "usb:") {
-		location := strings.TrimLeft(goPrinter, "usb:")
-		f, err := os.OpenFile(location, os.O_RDWR, os.ModeDevice)
-		if err != nil {
-			log.Println("error OpenFile usb:", err.Error())
-			return NewErr(err)
-		}
-		defer f.Close()
-		w = bufio.NewReadWriter(bufio.NewReader(f), bufio.NewWriter(f))
-		// } else if strings.HasPrefix(goPrinter, "int:") {
-		// 	ctx := gousb.NewContext()
-		// 	// location := strings.TrimLeft(goPrinter, "int:")
-		// 	targetBus := 1
-		// 	targetAddr := 5
-		// 	devs, err := ctx.OpenDevices(func(desc *gousb.DeviceDesc) bool {
-		// 		return int(desc.Bus) == targetBus && int(desc.Address) == targetAddr
-		// 	})
-		// 	if err != nil || len(devs) == 0 {
-		// 		log.Fatal("Could not find or open the device")
-		// 	}
-		// 	dev := devs[0]
-		// 	defer dev.Close()
-		// 	dev.SetAutoDetach(true)
 
-		// 	// 2. Claim the default interface (usually 0 for printers)
-		// 	// Note: This may require detaching the kernel driver on Linux
-		// 	intf, done, err := dev.DefaultInterface()
-		// 	if err != nil {
-		// 		log.Fatalf("Failed to claim interface: %v", err)
-		// 	}
-		// 	defer done()
-
-		// 	// 3. Open the Bulk Output Endpoint (usually endpoint #1 or #2)
-		// 	// You may need to inspect desc.Endpoints to find the correct Bulk Out ID
-		// 	out, err = intf.OutEndpoint(1)
-		// 	if err != nil {
-		// 		log.Fatalf("Failed to open OUT endpoint: %v", err)
-		// 	}
-		// 	// w = bufio.NewReadWriter(bufio.NewReader(outPort), bufio.NewWriter(f))
-		// 	rw := &USBReadWriter{out: out}
-		// 	reader := bufio.NewReader(rw)
-		// 	writer := bufio.NewWriter(rw)
-		// 	w = bufio.NewReadWriter(reader, writer)
-	} else {
-		return NewErr(errors.New("invalid printer"))
-	}
 	prt := escpos.New(w)
 
 	prt.Init()
 	prt.SetSmooth(1)
 	prt.SetAlign("left")
 
-	err := printImg(prt, goImagePath)
+	imgBytes, err := imgData(imagePath)
 	if err != nil {
-		return NewErr(err)
+		return err
 	}
+	err = writeChunk(w, prt, imgBytes)
+	if err != nil {
+		return err
+	}
+	time.Sleep(500 * time.Millisecond)
+	w.Flush()
+
 	prt.WriteRaw([]byte{0x1B, 0x64, 0x03})
 	prt.Cut()
 	prt.End()
 	w.Flush()
 	time.Sleep(1 * time.Second)
-	return NewOk(nil)
+	return nil
 }
 
-func Print(printer, imagePath string) string {
+func Check(printer string) error {
-	result := PrintImg(C.CString(printer), C.CString(imagePath))
+	conn, err := connect(printer)
-	r := C.GoString(result)
+	if err != nil {
-	return r
+		return err
+	}
+	defer conn.Close()
+
+	var w *bufio.ReadWriter
+	w = bufio.NewReadWriter(bufio.NewReader(conn), bufio.NewWriter(conn))
+	prt := escpos.New(w)
+
+	prt.Init()
+	prt.SetSmooth(1)
+	prt.SetAlign("left")
+	time.Sleep(100 * time.Millisecond)
+	return w.Flush()
+}
+
+func connect(printer string) (io.ReadWriteCloser, error) {
+	if strings.HasPrefix(printer, "tcp:") {
+		location := strings.TrimLeft(printer, "tcp:")
+		conn, err := net.Dial("tcp", location)
+		if err != nil {
+			log.Println("error net.Dial tcp:", err.Error())
+			return nil, err
+		}
+		return conn, nil
+	} else if strings.HasPrefix(printer, "usb:") {
+		location := strings.TrimLeft(printer, "usb:")
+		f, err := os.OpenFile(location, os.O_RDWR, os.ModeDevice)
+		if err != nil {
+			log.Println("error os.OpenFile usb:", err.Error())
+			return nil, err
+		}
+		return f, nil
+	}
+	return nil, errors.New("invalid printer")
+}
+
+// writeChunk breaks the large byte array into smaller chunks
+func writeChunk(w *bufio.ReadWriter, prt *escpos.Escpos, data []byte) error {
+	chunkSize := 1024 // 1 KB chunks work best for network printers
+	for i := 0; i < len(data); i += chunkSize {
+		end := min(i+chunkSize, len(data))
+
+		_, err := prt.WriteRaw(data[i:end])
+		if err != nil {
+			log.Println("Error writing image chunk:", err)
+			return err
+		}
+		if err := w.Flush(); err != nil {
+			log.Println("Error flushing buffer:", err)
+			return err
+		}
+		// Give the printer's network chip a microsecond to breathe
+		time.Sleep(5 * time.Millisecond)
+	}
+	return nil
 }