From 987f939bd88484331198de3a880c96ad9ad1f55e Mon Sep 17 00:00:00 2001
From: Tim Culverhouse <tim@timculverhouse.com>
Date: Fri, 7 Jun 2024 12:15:40 -0500
Subject: [PATCH] widgets(terminal): support cursor mode

---
 src/widgets/terminal/Screen.zig   |  2 ++
 src/widgets/terminal/Terminal.zig | 21 +++++++++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/src/widgets/terminal/Screen.zig b/src/widgets/terminal/Screen.zig
index 00b754f..3f20e43 100644
--- a/src/widgets/terminal/Screen.zig
+++ b/src/widgets/terminal/Screen.zig
@@ -27,6 +27,7 @@ pub const Cursor = struct {
     row: usize = 0,
     pending_wrap: bool = false,
     shape: vaxis.Cell.CursorShape = .default,
+    visible: bool = true,
 
     pub fn isOutsideScrollingRegion(self: Cursor, sr: ScrollingRegion) bool {
         return self.row < sr.top or
@@ -99,6 +100,7 @@ pub fn deinit(self: *Screen, alloc: std.mem.Allocator) void {
 
 /// copies the visible area to the destination screen
 pub fn copyTo(self: *Screen, dst: *Screen) !void {
+    dst.cursor = self.cursor;
     for (self.buf, 0..) |cell, i| {
         if (!cell.dirty) continue;
         self.buf[i].dirty = false;
diff --git a/src/widgets/terminal/Terminal.zig b/src/widgets/terminal/Terminal.zig
index 08b385b..6547372 100644
--- a/src/widgets/terminal/Terminal.zig
+++ b/src/widgets/terminal/Terminal.zig
@@ -25,6 +25,7 @@ pub const Options = struct {
 
 pub const Mode = struct {
     origin: bool = false,
+    cursor: bool = true,
 };
 
 allocator: std.mem.Allocator,
@@ -145,6 +146,9 @@ pub fn draw(self: *Terminal, win: vaxis.Window) !void {
             col += @max(cell.char.width, 1);
         }
     }
+
+    if (self.front_screen.cursor.visible)
+        win.showCursor(self.front_screen.cursor.col, self.front_screen.cursor.row);
 }
 
 fn opaqueRead(ptr: *const anyopaque, buf: []u8) !usize {
@@ -199,6 +203,14 @@ fn run(self: *Terminal) !void {
                         self.back_screen.cursor.col = col - 1;
                         self.back_screen.cursor.row = row - 1;
                     },
+                    'h', 'l' => {
+                        var iter = seq.iterator(u16);
+                        const mode = iter.next() orelse continue;
+                        // There is only one collision (mode = 4), and we don't support the private
+                        // version of it
+                        if (seq.private_marker != null and mode == 4) continue;
+                        self.setMode(mode, seq.final == 'h');
+                    },
                     'm' => {
                         if (seq.intermediate == null and seq.private_marker == null) {
                             self.back_screen.sgr(seq);
@@ -234,3 +246,12 @@ inline fn handleC0(self: *Terminal, b: ansi.C0) !void {
         else => log.warn("unhandled C0: 0x{x}", .{@intFromEnum(b)}),
     }
 }
+
+pub fn setMode(self: *Terminal, mode: u16, val: bool) void {
+    switch (mode) {
+        25 => {
+            self.mode.cursor = val;
+        },
+        else => return,
+    }
+}