[Lldb-commits] [lldb] [lldb] Implement a statusline in LLDB (PR #121860)

[David Spickett via lldb-commits]

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@@ -0,0 +1,171 @@
+//===-- Statusline.cpp ---------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "lldb/Core/Statusline.h"
+#include "lldb/Core/Debugger.h"
+#include "lldb/Core/FormatEntity.h"
+#include "lldb/Host/StreamFile.h"
+#include "lldb/Host/ThreadLauncher.h"
+#include "lldb/Interpreter/CommandInterpreter.h"
+#include "lldb/Symbol/SymbolContext.h"
+#include "lldb/Target/StackFrame.h"
+#include "lldb/Utility/AnsiTerminal.h"
+#include "lldb/Utility/LLDBLog.h"
+#include "lldb/Utility/Log.h"
+#include "lldb/Utility/StreamString.h"
+#include "llvm/Support/Locale.h"
+
+#define ESCAPE "\x1b"
+#define ANSI_NORMAL ESCAPE "[0m"
+#define ANSI_SAVE_CURSOR ESCAPE "7"
+#define ANSI_RESTORE_CURSOR ESCAPE "8"
+#define ANSI_CLEAR_BELOW ESCAPE "[J"
+#define ANSI_CLEAR_LINE "\r\x1B[2K"
+#define ANSI_SET_SCROLL_ROWS ESCAPE "[0;%ur"
+#define ANSI_TO_START_OF_ROW ESCAPE "[%u;0f"
+#define ANSI_UP_ROWS ESCAPE "[%dA"
+#define ANSI_DOWN_ROWS ESCAPE "[%dB"
+#define ANSI_FORWARD_COLS ESCAPE "\033[%dC"
+#define ANSI_BACKWARD_COLS ESCAPE "\033[%dD"
+
+using namespace lldb;
+using namespace lldb_private;
+
+static size_t ColumnWidth(llvm::StringRef str) {
+  std::string stripped = ansi::StripAnsiTerminalCodes(str);
+  return llvm::sys::locale::columnWidth(stripped);
+}
+
+Statusline::Statusline(Debugger &debugger) : m_debugger(debugger) { Enable(); }
+
+Statusline::~Statusline() { Disable(); }
+
+void Statusline::TerminalSizeChanged() {
+  m_terminal_size_has_changed = 1;
+
+  // This definitely isn't signal safe, but the best we can do, until we
+  // have proper signal-catching thread.
+  Redraw(/*update=*/false);
+}
+
+void Statusline::Enable() {
+  UpdateTerminalProperties();
+
+  // Reduce the scroll window to make space for the status bar below.
+  SetScrollWindow(m_terminal_height - 1);
+
+  // Draw the statusline.
+  Redraw();
+}
+
+void Statusline::Disable() {
+  UpdateTerminalProperties();
+
+  // Extend the scroll window to cover the status bar.
+  SetScrollWindow(m_terminal_height);
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DavidSpickett wrote:

Does this actually move things down or is there a blank line until you output some more data? Either is fine, just curious.

(going to try this out locally, so I will find out myself I expect)

https://github.com/llvm/llvm-project/pull/121860