implement ESC c -- full reset

src/terminal/Terminal.zig

@@ -1322,6 +1322,20 @@ pub fn setScrollingRegion(self: *Terminal, top: usize, bottom: usize) void {
     self.setCursorPos(1, 1);
 }
 
+/// Full reset
+pub fn fullReset(self: *Terminal) void {
+    self.primaryScreen(.{});
+    self.selection = null;
+    self.charset = .{};
+    self.eraseDisplay(.scrollback);
+    self.eraseDisplay(.complete);
+    self.modes = .{};
+    self.tabstops.reset(0);
+    self.screen.cursor = .{};
+    self.screen.saved_cursor = .{};
+    self.scrolling_region = .{ .top = 0, .bottom = self.rows - 1 };
+}
+
 test "Terminal: input with no control characters" {
     var t = try init(testing.allocator, 80, 80);
     defer t.deinit(testing.allocator);

src/terminal/stream.zig

@@ -567,6 +567,15 @@ pub fn Stream(comptime Handler: type) type {
                     },
                 } else log.warn("unimplemented invokeCharset: {}", .{action}),
 
+                // RIS - Full Reset
+                'c' => if (@hasDecl(T, "fullReset")) switch (action.intermediates.len) {
+                    0 => try self.handler.fullReset(),
+                    else => {
+                        log.warn("invalid full reset command: {}", .{action});
+                        return;
+                    },
+                } else log.warn("unimplemented ESC callback: {}", .{action}),
+
                 // LS2 - Locking Shift 2
                 'n' => if (@hasDecl(T, "invokeCharset")) switch (action.intermediates.len) {
                     0 => try self.handler.invokeCharset(.GL, .G2, false),

src/termio/Exec.zig

@@ -767,4 +767,10 @@ const StreamHandler = struct {
     ) !void {
         self.terminal.invokeCharset(active, slot, single);
     }
+
+    pub fn fullReset(
+        self: *StreamHandler,
+    ) !void {
+        self.terminal.fullReset();
+    }
 };