WIP: implemented a static function to determine if pandoc is installed or not

app/MindWork AI Studio/Tools/Pandoc.cs

@@ -0,0 +1,64 @@
+using System.Diagnostics;
+using System.Runtime.InteropServices;
+using System.Text.RegularExpressions;
+
+namespace AIStudio.Tools;
+
+public static partial class Pandoc
+{
+    // Minimale erforderliche Version von Pandoc
+    private static readonly Version MINIMUM_REQUIRED_VERSION = new Version(3, 6, 0);
+
+    /// <summary>
+    /// Checks if pandoc is available on the system and can be started as a process
+    /// </summary>
+    /// <returns>True, if pandoc is available and the minimum required version is met, else False.</returns>
+    public static async Task<bool> IsPandocAvailableAsync()
+    {
+        try
+        {
+            var startInfo = new ProcessStartInfo
+            {
+                FileName = GetPandocExecutableName(),
+                Arguments = "--version",
+                RedirectStandardOutput = true,
+                UseShellExecute = false,
+                CreateNoWindow = true
+            };
+            using var process = Process.Start(startInfo);
+            if (process == null)
+                return false;
+                
+            var output = await process.StandardOutput.ReadToEndAsync();
+            await process.WaitForExitAsync();
+            if (process.ExitCode != 0)
+                return false;
+
+            var versionMatch = PandocRegex().Match(output);
+            if (!versionMatch.Success) return false;
+            var versions = versionMatch.Groups[1].Value.Split('.');
+            var major = int.Parse(versions[0]);
+            var minor = int.Parse(versions[1]);
+            var patch = int.Parse(versions[2]);
+            var installedVersion = new Version(major, minor, patch);
+            
+            return installedVersion >= MINIMUM_REQUIRED_VERSION;
+
+        }
+        catch (Exception)
+        {
+            return false;
+        }
+    }
+
+    /// <summary>
+    /// Gibt den Namen der Pandoc-Executable basierend auf dem Betriebssystem zurück.
+    /// </summary>
+    private static string GetPandocExecutableName()
+    {
+        return RuntimeInformation.IsOSPlatform(OSPlatform.Windows) ? "pandoc.exe" : "pandoc";
+    }
+
+    [GeneratedRegex(@"pandoc(?:\.exe)?\s*([0-9]+\.[0-9]+\.[0-9]+)")]
+    private static partial Regex PandocRegex();
+}