FF-2000: Created PDF plugin

Pdf/FlowElements/PdfToTextFile.cs

@@ -0,0 +1,58 @@
+namespace FileFlows.Pdf.FlowElements;
+
+/// <summary>
+/// A flow element that extracts the text of a PDF to a file
+/// </summary>
+public class PdfToTextFile : Node
+{
+    /// <inheritdoc />
+    public override int Inputs => 1;
+    /// <inheritdoc />
+    public override int Outputs => 2;
+    /// <inheritdoc />
+    public override FlowElementType Type => FlowElementType.Logic;
+    /// <inheritdoc />
+    public override string Icon => "fas fa-file-pdf";
+    /// <inheritdoc />
+    public override string HelpUrl => "https://fileflows.com/docs/plugins/pdf/pdf-to-text-file";
+    /// <inheritdoc />
+    public override string Group => "PDF";
+
+    /// <summary>
+    /// Gets or sets the output text location
+    /// </summary>
+    [TextVariable(1)]
+    [Required]
+    public string File { get; set; } = null!;
+
+    /// <inheritdoc />
+    public override int Execute(NodeParameters args)
+    {
+        var fileResult = args.FileService.GetLocalPath(args.WorkingFile);
+        if (fileResult.Failed(out var error))
+            return args.Fail("Failed to get local file: " + error);
+        
+        var file = fileResult.Value;
+        var output = args.ReplaceVariables(File);
+        args.Logger?.ILog("Extracting PDF to file: " + output);
+        var result = args.PdfHelper.ExtractText(file);
+        if (result.Failed(out error))
+            return args.Fail("Failed to extract text: " + error);
+
+        var text = result.Value;
+        if (string.IsNullOrWhiteSpace(text))
+        {
+            args.Logger?.ILog("No text found in PDF file");
+            return 2;
+        }
+        
+        args.FileService.FileDelete(file);
+        var writeResult = args.FileService.FileAppendAllText(file, text);
+        if (writeResult.Failed(out error))
+            return args.Fail("Failed to write text to file: " + error);
+        
+        args.Logger?.ILog("Saved PDF text to file: " + file);
+        args.SetWorkingFile(file);
+        return 1;
+    }
+}