Hide cursor during redraws

2 files changed, 28 insertions, 0 deletions

diff --git a/goldfishterm/simple.cc b/goldfishterm/simple.cc
index 9c4c9a9..88ceef0 100644
--- a/goldfishterm/simple.cc
+++ b/goldfishterm/simple.cc
@@ -23,6 +23,7 @@
 
 #include "goldfishterm/internal/emit.h"
 #include "goldfishterm/terminfo.h"
+#include "third_party/abseil/absl/strings/str_cat.h"
 #include "third_party/abseil/absl/strings/string_view.h"
 
 namespace goldfishterm {
@@ -48,6 +49,19 @@ absl::string_view TerminalNameFromEnvironment() {
   return name;
 }
 
+StringCapability CursorVisibilityCapability(CursorVisibility v) {
+  switch (v) {
+    case CursorVisibility::kInvisible:
+      return StringCapability::kCursorInvisible;
+    case CursorVisibility::kNormal:
+      return StringCapability::kCursorNormal;
+    case CursorVisibility::kVeryVisible:
+      return StringCapability::kCursorVisible;
+    default:
+      throw std::invalid_argument(absl::StrCat("invalid CursorVisibility ", v));
+  }
+}
+
 }  // namespace
 
 SimpleTerminalOutput::SimpleTerminalOutput()
@@ -59,6 +73,10 @@ SimpleTerminalOutput::SimpleTerminalOutput(const termios& tty)
   baud_ = cfgetospeed(&tty);
 }
 
+void SimpleTerminalOutput::SetCursorVisibility(CursorVisibility v) {
+  return Emit(CursorVisibilityCapability(v));
+}
+
 void SimpleTerminalOutput::Emit(
     StringCapability cap,
     std::vector<goldfishterm_internal::StringCapabilityParameter> parameters) {
diff --git a/goldfishterm/simple.h b/goldfishterm/simple.h
index 3f5cc9f..48a7789 100644
--- a/goldfishterm/simple.h
+++ b/goldfishterm/simple.h
@@ -26,6 +26,13 @@
 
 namespace goldfishterm {
 
+// The type of cursor in use.
+enum class CursorVisibility {
+  kInvisible,
+  kNormal,
+  kVeryVisible,
+};
+
 // Looks up escape sequences for the terminal described in the TERM environment
 // variable, and allows sending those escape sequences to standard output.
 //
@@ -58,6 +65,9 @@ class SimpleTerminalOutput final {
   // Moves the cursor down one line.
   void CursorDown() { Emit(StringCapability::kCursorDown); }
 
+  // Sets the cursor visibility.
+  void SetCursorVisibility(CursorVisibility);
+
  private:
   void Emit(StringCapability,
             std::vector<goldfishterm_internal::StringCapabilityParameter> = {});