yavsc/Yavsc/Views/FrontOffice/Estimate.pdf.cshtml

@using System.Reflection;
@using System.IO;
@using Microsoft.Extensions.WebEncoders;
@using System.Diagnostics;
@using System.Text;
@using Yavsc.Formatters;
@model Estimate
@{
    if (ViewBag.TempDir==null) { throw new InvalidOperationException(); }

    ViewBag.Pdf = "";
    ViewBag.TeX = "";
    var writer = new System.IO.StringWriter();
    var content = await Html.PartialAsync("Estimate.tex", Model );
    content.WriteTo(writer, new TexEncoder());
    var contentStr = writer.ToString();
    string name = $"estimate-{Model.Id}";
    string fullname = new FileInfo(
         System.IO.Path.Combine(ViewBag.TempDir,name)).FullName;
    string ofullname = new FileInfo(
         System.IO.Path.Combine(ViewBag.BillsDir,name)).FullName;

      FileInfo fi = new FileInfo(fullname + ".tex");
      FileInfo fo = new FileInfo(ofullname + ".pdf");
      using (StreamWriter sw = new StreamWriter (fi.FullName))
      {
        sw.Write (contentStr);
      }
      if (!fi.Exists)
      {
          throw new Exception ("Source write failed");
      }
      using (Process p = new Process ()) {
        p.StartInfo.WorkingDirectory = ViewBag.TempDir;
        p.StartInfo = new ProcessStartInfo ();
        p.StartInfo.UseShellExecute = false;
        p.StartInfo.FileName = "/usr/bin/texi2pdf";
        p.StartInfo.Arguments = $"--batch --build-dir=. -o {fo.FullName} {fi.FullName}";
        p.Start ();
        p.WaitForExit ();
        if (p.ExitCode != 0) {
          throw new Exception ("Pdf generation failed with exit code:" + p.ExitCode);
          }
      }
      ViewBag.Success = fo.Exists; 
      fi.Delete();
      var uri = $"~/api/pdfestimate/{Model.Id}";

}

<a href="@uri" >@uri</a>