1 files changed, 106 insertions, 0 deletions
diff --git a/tui.jai b/tui.jai
new file mode 100644
index 0000000..a0eb025
--- /dev/null
+++ b/tui.jai
@@ -0,0 +1,106 @@
+#import "Basic";
+
+Drawings :: struct {
+    CornerBR                :: "\x6A";
+    CornerTR                :: "\x6B";
+    CornerTL                :: "\x6C";
+    CornerBL                :: "\x6D";
+    Cross                   :: "\x6E";
+    LineH                   :: "\x71";
+    TeeL                    :: "\x74";
+    TeeR                    :: "\x75";
+    TeeB                    :: "\x76";
+    TeeT                    :: "\x77";
+    LineV                   :: "\x78";
+}
+
+Commands :: struct {
+    EnterAlternateBuffer    :: "\e[?1049h";
+    EnterMainBuffer         :: "\e[?1049l";
+
+    EnterDrawingMode        :: "\e(0";
+    EnterNormalMode         :: "\e(B";
+    ClearScreen             :: "\e[2J";
+
+    // Cursor Visibility
+    ShowCursor              :: "\e[?25h";
+    HideCursor              :: "\e[?25l";
+    StartBlinking           :: "\e[?25h]";
+    StopBlinking            :: "\e[?25l]";
+
+    // Cursor Shape
+    DefaultShape            :: "\e[0 q";
+    BlinkingBlockShape      :: "\e[1 q";
+    SteadyBlockShape        :: "\e[2 q";
+    BlinkingUnderlineShape  :: "\e[3 q";
+    SteadyUnderlineShape    :: "\e[4 q";
+    BlinkingBarShape        :: "\e[5 q";
+    SteadyBarShape          :: "\e[6 q";
+
+    // Input Mode
+    KeypadAppMode           :: "\e=";
+    KeypadNumMode           :: "\e>";
+    CursorAppMode           :: "\e[?1h";
+    CursorNormalMode        :: "\e[?1l";
+
+    // Query State
+    QueryCursorPos          :: "\e[6n"; // Emits the cursor position as: ESC [ <r> ; <c> R Where <r> = row and <c> = column.
+    QueryDeviceAttributes   :: "\e[0c";
+}
+
+start :: () {
+    write_string(Commands.EnterAlternateBuffer);
+}
+
+stop :: () {
+    write_string(Commands.EnterMainBuffer);
+}
+
+draw_box :: (x: int, y: int, width: int, height: int, to_standard_error := false) {
+
+    write_string(Commands.HideCursor);
+    write_strings(
+        // Commands.EnterNormalMode,
+        Commands.EnterDrawingMode,
+        "\e[1;1H",       // Move to position 1,1
+        // TODO // Move pointer to top-left corner.
+        Drawings.CornerTL,
+        to_standard_error = to_standard_error);
+
+    for 1..width-2 {
+        write_string(Drawings.LineH, to_standard_error = to_standard_error);
+    }
+    write_string(Drawings.CornerTR, to_standard_error = to_standard_error);
+
+
+    // TODO Take care of the temporary allocations.
+    for idx: 2..height-1 {
+        tmpL := tprint("\e[%;%H", idx, 1);
+        tmpR := tprint("\e[%;%H", idx, width);
+        write_strings(
+            tmpL,
+            Drawings.LineV,
+            tmpR,
+            Drawings.LineV,
+            to_standard_error = to_standard_error);
+    }
+
+    tmpBL := tprint("\e[%;%H", height, 1);
+    write_strings(
+        tmpBL,
+        Drawings.CornerBL,
+        to_standard_error = to_standard_error);
+    for 1..width-2 {
+        write_string(Drawings.LineH, to_standard_error = to_standard_error);
+    }
+    write_string(Drawings.CornerBR, to_standard_error = to_standard_error);
+    
+    write_strings(
+        // TODO // print
+        Commands.EnterNormalMode,
+        to_standard_error = to_standard_error);
+}
+
+clear_screen :: inline () {
+    write_string(Commands.ClearScreen);
+}