Documents: use WinziPrint instead of WeasyPrint

Elwig/Documents/Pdf.cs

@@ -2,44 +2,50 @@ using System.Threading.Tasks;
 using Elwig.Helpers;
 using Elwig.Windows;
 using System.Diagnostics;
-using Balbarak.WeasyPrint;
 using System;
 using System.IO;
+using System.Collections.Generic;
+using System.Windows;
+using System.Text.RegularExpressions;
+using System.Linq;
 
 namespace Elwig.Documents {
     public static class Pdf {
 
         private static readonly string PdfToPrinter = App.ExePath + "PDFtoPrinter.exe";
-        private static readonly FilesManager WeasyPrintManager = new();
-        private static string? WeasyPrintPython = null;
-        private static string? WeasyPrintDir => WeasyPrintManager.FolderPath;
-        public static bool IsReady => WeasyPrintPython != null && WeasyPrintDir != null;
+        private static readonly string WinziPrint = App.ExePath + "WinziPrint.exe";
+        private static Process? WinziPrintProc;
+        public static bool IsReady => WinziPrintProc != null;
+
 
         public static async Task Init(Action evtHandler) {
-            if (!WeasyPrintManager.IsFilesExsited()) {
-                await WeasyPrintManager.InitFilesAsync();
-            }
-            WeasyPrintPython = Path.Combine(WeasyPrintManager.FolderPath, "python.exe");
+            var p = new Process() { StartInfo = new() {
+                FileName = WinziPrint,
+                Arguments = "-",
+                CreateNoWindow = true,
+                UseShellExecute = false,
+                RedirectStandardInput = true,
+                RedirectStandardOutput = true
+            } };
+            p.Start();
+            WinziPrintProc = p;
             evtHandler();
         }
 
-        public static async Task Convert(string htmlPath, string pdfPath) {
-            var p = new Process() { StartInfo = new() {
-                FileName = WeasyPrintPython,
-                CreateNoWindow = true,
-                WorkingDirectory = WeasyPrintDir,
-                RedirectStandardError = true,
-            } };
-            p.StartInfo.EnvironmentVariables["PATH"] = "Scripts;gtk3;" + Environment.GetEnvironmentVariable("PATH");
-            p.StartInfo.ArgumentList.Add("scripts/weasyprint.exe");
-            p.StartInfo.ArgumentList.Add("-e");
-            p.StartInfo.ArgumentList.Add("utf8");
-            p.StartInfo.ArgumentList.Add(htmlPath);
-            p.StartInfo.ArgumentList.Add(pdfPath);
-            p.Start();
-            await p.WaitForExitAsync();
-            var stderr = await p.StandardError.ReadToEndAsync();
-            if (p.ExitCode != 0) throw new Exception(stderr);
+        public static async Task<IEnumerable<int>> Convert(string htmlPath, string pdfPath) {
+            return await Convert(new string[] { htmlPath }, pdfPath);
+        }
+
+        public static async Task<IEnumerable<int>> Convert(IEnumerable<string> htmlPath, string pdfPath) {
+            if (WinziPrintProc == null) throw new InvalidOperationException("The WinziPrint process has not been initialized yet");
+            await WinziPrintProc.StandardInput.WriteLineAsync($"{string.Join(';', htmlPath)};{pdfPath}");
+            var line = await WinziPrintProc.StandardOutput.ReadLineAsync() ?? throw new IOException("Invalid response from WinziPrint");
+            if (line.StartsWith("error:")) {
+                MessageBox.Show(line[6..].Trim(), "Fehler", MessageBoxButton.OK, MessageBoxImage.Error);
+                return Array.Empty<int>();
+            }
+            var m = Regex.Match(line, @"\(([0-9, ]+)\)");
+            return m.Groups[1].Value.Split(", ").Select(n => int.Parse(n));
         }
 
         public static void Show(TempFile file, string title) {