[Lldb-commits] [lldb] [lldb] Real-time console pane for output in lldb tui (PR #177160)

[Nagesh Nazare via lldb-commits]

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@@ -6309,6 +6309,236 @@ HandleCharResult HelpDialogDelegate::WindowDelegateHandleChar(Window &window,
   return eKeyHandled;
 }
 
+class ConsoleOutputWindowDelegate : public WindowDelegate {
+private:
+  void PollProcessOutput() {
+    ExecutionContext exe_ctx =
+        m_debugger.GetCommandInterpreter().GetExecutionContext();
+    Process *process = exe_ctx.GetProcessPtr();
+
+    if (!process || !process->IsAlive())
+      return;
+
+    // Buffer for reading output.
+    char buffer[1024];
+    Status error;
+
+    // Read process's stdout.
+    size_t stdout_bytes = process->GetSTDOUT(buffer, sizeof(buffer) - 1, error);
+    if (stdout_bytes > 0) {
+      buffer[stdout_bytes] = '\0';
+      AppendOutput(buffer, false);
+    }
+
+    // Read process's stderr.
+    size_t stderr_bytes = process->GetSTDERR(buffer, sizeof(buffer) - 1, error);
+    if (stderr_bytes > 0) {
+      buffer[stderr_bytes] = '\0';
+      AppendOutput(buffer, true);
+    }
+  }
+
+  void AppendOutput(const char *text, bool is_stderr) {
+    if (!text || text[0] == '\0')
+      return;
+
+    std::lock_guard<std::mutex> lock(m_output_mutex);
+
+    // Split text into lines and add to buffer.
+    std::string remaining = m_partial_line;
+    remaining += text;
+
+    size_t start = 0, pos = 0;
+    while ((pos = remaining.find('\n', start)) != std::string::npos) {
+      std::string line = remaining.substr(start, pos - start);
+      if (is_stderr)
+        line = "[stderr] " + line;
+      m_output_lines.push_back(line);
+
+      // Keep buffer size under limit.
+      while (m_output_lines.size() > m_max_lines) {
+        m_output_lines.pop_front();
+        if (m_first_visible_line > 0)
+          --m_first_visible_line;
+      }
+
+      start = pos + 1;
+    }
+
+    // Save any remaining partial line.
+    m_partial_line = remaining.substr(start);
+
+    // Auto-scroll to bottom if enabled.
+    if (m_auto_scroll && !m_output_lines.empty()) {
+      m_first_visible_line =
+          m_output_lines.size() > 0 ? m_output_lines.size() - 1 : 0;
+    }
+  }
+
+public:
+  ConsoleOutputWindowDelegate(Debugger &debugger)
+      : m_debugger(debugger), m_first_visible_line(0), m_auto_scroll(true),
+        m_max_lines(10000) {}
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nageshnnazare wrote:

Added a variable to set non-default value

https://github.com/llvm/llvm-project/pull/177160