fix: headless/non-interactive Rdx for bots (cast + empty output file)

SmartImage.Rdx/Commands/Search/SearchCommand.cs

@@ -98,8 +98,12 @@ private async Task InitQueryAsync(ProgressContext ctx)
 		if (!url) {
 			throw new SmartImageException($"Could not upload {Query}");
 		}
-
-		m_queryCanvasImg = new CanvasImage(Query.Source.GetSource());
+
+		// CanvasImage preview is only needed for interactive UI. Building it
+		// headless has thrown on some image sources; skip when not interactive.
+		if (CommandSettings.Interactive) {
+			m_queryCanvasImg = new CanvasImage(Query.Source.GetSource());
+		}
 
 		p.Increment(Elements.COMPLETE / 2);
 
@@ -171,28 +175,25 @@ private async Task RunSearchLiveAsync(LiveDisplayContext c, CancellationToken ct
 		while (!ct.IsCancellationRequested && await Client.ResultChannel.Reader.WaitToReadAsync(ct)) {
 			var result = await Client.ResultChannel.Reader.ReadAsync(ct);
 
+			// Always collect for WriteOutputFile (interactive and headless).
+			// Previously non-interactive mode never filled m_dialogs, so -o files
+			// were empty even when the search succeeded.
+			m_dialogs.TryAdd(result, ResultViewState.Create(result));
 
 			if (CommandSettings.Interactive) {
-
-				m_dialogs.TryAdd(result, ResultViewState.Create(result));
-
 				m_mainTable.AddRow(result.GetMainRows());
 				Elements.Prm_SearchResult.AddChoice(result);
-
 			}
 			else {
-
+				// GetMainRows returns IList<IRenderable> (a List), not IRenderable[].
+				// The old cast threw InvalidCastException after upload on Linux headless.
 				var fullRows = result.GetFullRows();
-
 				foreach (var list in fullRows) {
-					var row = (IRenderable[]) list;
-					m_mainTable.AddRow(row);
+					m_mainTable.AddRow(list.ToArray());
 				}
 			}
 
-
 			c.Refresh();
-
 		}
 
 		await searchTask;

SmartImage.Rdx/Program.cs

@@ -104,7 +104,9 @@ public static async Task<int> Main(string[] args)
 		}
 		finally {
 
-			if (x != Common.EC_OK) {
+			// Never block on a prompt when stdin is redirected / non-interactive
+			// (bots, Docker, CI). ConfirmAsync crashes with Failed to read input.
+			if (x != Common.EC_OK && !Console.IsInputRedirected) {
 				await AnsiConsole.ConfirmAsync("Press any key to continue");
 			}
 		}
@@ -186,13 +188,17 @@ private static void HandleArgs(ref string[] args)
 
 			var pipeInput = ConsoleUtil.ParseInputStream();
 
-			var newArgs = new string[args.Length + 1];
-			newArgs[0] = pipeInput;
-			args.CopyTo(newArgs, 1);
+			// Ignore empty redirects (DEVNULL / closed pipe) so headless bots
+			// can pass the query solely via argv.
+			if (!String.IsNullOrWhiteSpace(pipeInput)) {
+				var newArgs = new string[args.Length + 1];
+				newArgs[0] = pipeInput;
+				args.CopyTo(newArgs, 1);
 
-			args = newArgs;
+				args = newArgs;
 
-			AnsiConsole.WriteLine($"Received input from stdin");
+				AnsiConsole.WriteLine($"Received input from stdin");
+			}
 		}
 #endif
 

SmartImage.Rdx/Shell/ConsoleUtil.cs

@@ -36,7 +36,8 @@ public static string ParseInputStream(int bufSize = 4096, int maxSize = 10_000_0
 		while ((bytesRead = stdin.Read(buffer, 0, buffer.Length)) > 0) {
 			if (iter == 0) {
 
-				if (buffer[0]    == s_utf8BomSig[0]
+				if (bytesRead >= 3
+				    && buffer[0] == s_utf8BomSig[0]
 				    && buffer[1] == s_utf8BomSig[1]
 				    && buffer[2] == s_utf8BomSig[2]) {
 
@@ -53,7 +54,12 @@ public static string ParseInputStream(int bufSize = 4096, int maxSize = 10_000_0
 			// prog?.Report(b2pos);
 		}
 
-		if (buffer2[(b2pos - 1)] == '\n' && buffer2[(b2pos - 2)] == '\r') {
+		// Empty redirected stdin (e.g. DEVNULL) used to IndexOutOfRange on b2pos-1.
+		if (b2pos == 0) {
+			return null;
+		}
+
+		if (b2pos >= 2 && buffer2[(b2pos - 1)] == '\n' && buffer2[(b2pos - 2)] == '\r') {
 			b2pos -= 2;
 		}