terminal: cursor back should reduce count if pending wrap is one

src/terminal/Terminal.zig

@@ -685,7 +685,7 @@ pub fn print(self: *Terminal, c: u21) !void {
     self.previous_char = c;
 
     // If we're soft-wrapping, then handle that first.
-    if (self.screen.cursor.pending_wrap and self.modes.get(.autowrap))
+    if (self.screen.cursor.pending_wrap and self.modes.get(.wraparound))
         try self.printWrap();
 
     // If we have insert mode enabled then we need to handle that. We
@@ -1354,13 +1354,19 @@ pub fn eraseChars(self: *Terminal, count: usize) void {
 
 /// Move the cursor to the left amount cells. If amount is 0, adjust it to 1.
 /// TODO: test
-pub fn cursorLeft(self: *Terminal, count: usize) void {
+pub fn cursorLeft(self: *Terminal, count_req: usize) void {
     const tracy = trace(@src());
     defer tracy.end();
 
-    // TODO: scroll region
+    // If we have a pending wrap state on, we reset it and reduce our count.
-    self.screen.cursor.x -|= if (count == 0) 1 else count;
+    var count: usize = @max(count_req, 1);
+    if (self.screen.cursor.pending_wrap) {
         self.screen.cursor.pending_wrap = false;
+        count -= 1;
+    }
+
+    // TODO: scroll region
+    self.screen.cursor.x -|= count;
 }
 
 /// Move the cursor right amount columns. If amount is greater than the
@@ -3293,3 +3299,57 @@ test "Terminal: eraseDisplay protected above" {
         try testing.expectEqualStrings("\n     X  9", str);
     }
 }
+
+test "Terminal: cursorLeft no wrap" {
+    const alloc = testing.allocator;
+    var t = try init(alloc, 10, 5);
+    defer t.deinit(alloc);
+
+    try t.print('A');
+    t.carriageReturn();
+    try t.linefeed();
+    try t.print('B');
+    t.cursorLeft(10);
+
+    {
+        var str = try t.plainString(testing.allocator);
+        defer testing.allocator.free(str);
+        try testing.expectEqualStrings("A\nB", str);
+    }
+}
+
+test "Terminal: cursorLeft unsets pending wrap state" {
+    const alloc = testing.allocator;
+    var t = try init(alloc, 5, 5);
+    defer t.deinit(alloc);
+
+    for ("ABCDE") |c| try t.print(c);
+    try testing.expect(t.screen.cursor.pending_wrap);
+    t.cursorLeft(1);
+    try testing.expect(!t.screen.cursor.pending_wrap);
+    try t.print('X');
+
+    {
+        var str = try t.plainString(testing.allocator);
+        defer testing.allocator.free(str);
+        try testing.expectEqualStrings("ABCDX", str);
+    }
+}
+
+test "Terminal: cursorLeft unsets pending wrap state with longer jump" {
+    const alloc = testing.allocator;
+    var t = try init(alloc, 5, 5);
+    defer t.deinit(alloc);
+
+    for ("ABCDE") |c| try t.print(c);
+    try testing.expect(t.screen.cursor.pending_wrap);
+    t.cursorLeft(3);
+    try testing.expect(!t.screen.cursor.pending_wrap);
+    try t.print('X');
+
+    {
+        var str = try t.plainString(testing.allocator);
+        defer testing.allocator.free(str);
+        try testing.expectEqualStrings("ABXDE", str);
+    }
+}

src/terminal/modes.zig

@@ -152,11 +152,12 @@ const entries: []const ModeEntry = &.{
     .{ .name = "insert", .value = 4 },
     .{ .name = "reverse_colors", .value = 5 },
     .{ .name = "origin", .value = 6 },
-    .{ .name = "autowrap", .value = 7, .default = true },
+    .{ .name = "wraparound", .value = 7, .default = true },
     .{ .name = "mouse_event_x10", .value = 9 },
     .{ .name = "cursor_blinking", .value = 12 },
     .{ .name = "cursor_visible", .value = 25, .default = true },
     .{ .name = "enable_mode_3", .value = 40 },
+    .{ .name = "reverse_wrap", .value = 45 },
     .{ .name = "keypad_keys", .value = 66 },
     .{ .name = "mouse_event_normal", .value = 1000 },
     .{ .name = "mouse_event_button", .value = 1002 },