200 lines
4.0 KiB
Go
200 lines
4.0 KiB
Go
package main
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import (
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"errors"
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"html/template"
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"image"
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"image/png"
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"log"
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"net/http"
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"os"
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"strconv"
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"janouch.name/sklad/bdf"
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"janouch.name/sklad/imgutil"
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"janouch.name/sklad/label"
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"janouch.name/sklad/ql"
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)
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var font *bdf.Font
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var tmpl = template.Must(template.New("form").Parse(`
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<!DOCTYPE html>
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<html><body>
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<h1>PT-CBP label printing tool</h1>
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<table><tr>
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<td valign=top>
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<img border=1 src='?img&scale={{.Scale}}&text={{.Text}}'>
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</td>
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<td valign=top>
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<fieldset>
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{{ if .Printer }}
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<p>Printer: {{ .Printer.Manufacturer }} {{ .Printer.Model }}
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<p>Tape:
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{{ if .Printer.LastStatus }}
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{{ .Printer.LastStatus.MediaWidthMM }} mm ×
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{{ .Printer.LastStatus.MediaLengthMM }} mm
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{{ if .MediaInfo }}
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(offset: {{ .MediaInfo.SideMarginPins }} pt,
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print area: {{ .MediaInfo.PrintAreaPins }} pt)
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{{ else }}
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(unknown media)
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{{ end }}
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{{ if .Printer.LastStatus.Errors }}
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{{ range .Printer.LastStatus.Errors }}
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<p>Error: {{ . }}
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{{ end }}
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{{ end }}
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{{ end }}
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{{ if .InitErr }}
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{{ .InitErr }}
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{{ end }}
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{{ else }}
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<p>Error: {{ .PrinterErr }}
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{{ end }}
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</fieldset>
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<fieldset>
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<p>Font: {{ .Font.Name }}
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</fieldset>
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<form><fieldset>
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<p><label for=text>Text:</label>
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<input id=text name=text value='{{.Text}}'>
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<label for=scale>Scale:</label>
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<input id=scale name=scale value='{{.Scale}}' size=1>
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<p><input type=submit value='Update'>
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<input type=submit name=print value='Update and Print'>
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</fieldset></form>
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</td>
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</tr></table>
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</body></html>
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`))
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func getPrinter() (*ql.Printer, error) {
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printer, err := ql.Open()
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if err != nil {
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return nil, err
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}
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if printer == nil {
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return nil, errors.New("no suitable printer found")
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}
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return printer, nil
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}
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func getStatus(printer *ql.Printer) error {
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if err := printer.Initialize(); err != nil {
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return err
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}
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if err := printer.UpdateStatus(); err != nil {
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return err
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}
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return nil
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}
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func handle(w http.ResponseWriter, r *http.Request) {
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if err := r.ParseForm(); err != nil {
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http.Error(w, err.Error(), 500)
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return
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}
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var (
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initErr error
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mediaInfo *ql.MediaInfo
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)
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printer, printerErr := getPrinter()
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if printerErr == nil {
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defer printer.Close()
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printer.StatusNotify = func(status *ql.Status) {
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log.Printf("\x1b[1mreceived status\x1b[m\n%s", status)
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}
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if initErr = getStatus(printer); initErr == nil {
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mediaInfo = ql.GetMediaInfo(
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printer.LastStatus.MediaWidthMM(),
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printer.LastStatus.MediaLengthMM(),
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)
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}
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}
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var params = struct {
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Printer *ql.Printer
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PrinterErr error
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InitErr error
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MediaInfo *ql.MediaInfo
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Font *bdf.Font
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Text string
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Scale int
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}{
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Printer: printer,
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PrinterErr: printerErr,
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InitErr: initErr,
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MediaInfo: mediaInfo,
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Font: font,
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Text: r.FormValue("text"),
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}
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var err error
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params.Scale, err = strconv.Atoi(r.FormValue("scale"))
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if err != nil {
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params.Scale = 3
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}
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var img image.Image
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if mediaInfo != nil {
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img = &imgutil.LeftRotate{Image: label.GenLabelForHeight(
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font, params.Text, mediaInfo.PrintAreaPins, params.Scale)}
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if r.FormValue("print") != "" {
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if err := printer.Print(img); err != nil {
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log.Println("print error:", err)
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}
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}
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}
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if _, ok := r.Form["img"]; !ok {
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w.Header().Set("Content-Type", "text/html")
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tmpl.Execute(w, ¶ms)
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return
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}
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if mediaInfo == nil {
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http.Error(w, "unknown media", 500)
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return
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}
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w.Header().Set("Content-Type", "image/png")
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if err := png.Encode(w, img); err != nil {
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http.Error(w, err.Error(), 500)
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return
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}
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}
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func main() {
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if len(os.Args) != 3 {
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log.Fatalf("usage: %s ADDRESS BDF-FILE\n", os.Args[0])
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}
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address, bdfPath := os.Args[1], os.Args[2]
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var err error
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fi, err := os.Open(bdfPath)
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if err != nil {
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log.Fatalln(err)
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}
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font, err = bdf.NewFromBDF(fi)
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if err := fi.Close(); err != nil {
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log.Fatalln(err)
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}
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if err != nil {
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log.Fatalln(err)
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}
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log.Println("starting server")
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http.HandleFunc("/", handle)
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log.Fatalln(http.ListenAndServe(address, nil))
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}
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