print_windows.go

package main

import (
	"fmt"
	"image/color"
	"log/slog"
	"os/exec"
	"slices"
	"strings"

	"fyne.io/fyne/v2"
	"fyne.io/fyne/v2/canvas"
	"fyne.io/fyne/v2/container"
	"fyne.io/fyne/v2/dialog"
	"fyne.io/fyne/v2/widget"

	"github.com/alexbrainman/printer"
)

func print(a fyne.App, w fyne.Window) {
	printers, err := printer.ReadNames()
	if err != nil {
		slog.Error(err.Error())
		dialog.NewError(err, w).Show()
		return
	}

	entry := widget.NewSelectEntry(printers)

	dialog.NewForm("Print", "OK", "Cancel", []*widget.FormItem{widget.NewFormItem("Printer", entry)}, func(b bool) {
		if !b {
			return
		}

		slog.Info("printing", "printer", entry.Text)

		dlg := dialog.NewCustomWithoutButtons("Printing...", container.NewStack(canvas.NewRectangle(color.Transparent), widget.NewProgressBarInfinite()), w)
		dlg.Show()

		var lines []string
		lines = append(lines, "AUTO-GENERATED by gecfg-editor version "+a.Metadata().Version)
		lines = append(lines, "<github.com/MatusOllah/gecfg-editor>")
		lines = append(lines, "")
		lines = append(lines, "File name: "+openFileName)
		lines = append(lines, "")
		var keys []string
		for k, _ := range theMap {
			keys = append(keys, k)
		}
		slices.Sort(keys)
		for _, k := range keys {
			lines = append(lines, fmt.Sprintf("%s (%T) = %v", k, theMap[k], theMap[k]))
		}

		if err := printOneDocument(entry.Text, lines); err != nil {
			slog.Error(err.Error())
			dlg.Hide()
			dialog.NewError(err, w).Show()
			return
		}

		dlg.Hide()
	}, w).Show()
}

func printOneDocument(printerName string, lines []string) error {
	var _data []string

	for _, line := range lines {
		_data = append(_data, line+"`r`n")
	}

	data := strings.Join(_data, "")

	cmd := exec.Command("powershell", "-Command", fmt.Sprintf("Out-Printer -Name \"%s\" -InputObject \"%s\"", printerName, data))
	slog.Info("executing", "path", cmd.Path, "args", cmd.Args)
	if err := cmd.Run(); err != nil {
		return err
	}

	return nil
}