Add experimental raw vt100 UI backend

The intention of this is not to slowly reimplement curses but to provide
a minimal working terminal UI backend which can also be used for debugging,
fuzzing and in environments where curses is not available.

Currently no attempt is made to optimize terminal output. The amount of
flickering will depend on the smartness of your terminal emulator.

1 files changed, 15 insertions, 0 deletions

diff --git a/ui.h b/ui.h
index 41ef975..ee434fc 100644
--- a/ui.h
+++ b/ui.h
@@ -50,12 +50,27 @@ enum UiStyle {
 	UI_STYLE_MAX,
 };
 
+#if CONFIG_CURSES
 typedef uint64_t CellAttr;
 typedef short CellColor;
 
 static inline bool cell_color_equal(CellColor c1, CellColor c2) {
 	return c1 == c2;
 }
+#else
+typedef uint8_t CellAttr;
+typedef struct {
+	uint8_t r, g, b;
+	uint8_t index;
+} CellColor;
+
+static inline bool cell_color_equal(CellColor c1, CellColor c2) {
+	if (c1.index != (uint8_t)-1 || c2.index != (uint8_t)-1)
+		return c1.index == c2.index;
+	return c1.r == c2.r && c1.g == c2.g && c1.b == c2.b;
+}
+
+#endif
 
 typedef struct {
 	CellAttr attr;