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terminal: resizing to 1 col wide with wide chars

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This commit is contained in:
Mitchell Hashimoto
2023-08-12 10:23:06 -07:00
parent 44dd51a5b9
commit 71c8d5fc8e
1 changed files with 54 additions and 7 deletions
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61
src/terminal/Screen.zig
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@ -2332,9 +2332,19 @@ pub fn resize(self: *Screen, rows: usize, cols: usize) !void {
var cur_old_row_wrapped = old_row_wrapped;
var cur_trimmed_row = trimmed_row;
while (true) {
for (cur_trimmed_row, 0..) |cell, old_x| {
// Set to true to write an empty cell
var clear_cell: bool = false;
for (cur_trimmed_row, 0..) |old_cell, old_x| {
var cell: StorageCell = old_cell;
// This is a really wild edge case if we're resizing down
// to 1 column. In reality this is pretty broken for end
// users so downstream should prevent this.
if (self.cols == 1 and
(cell.cell.attrs.wide or
cell.cell.attrs.wide_spacer_head or
cell.cell.attrs.wide_spacer_tail))
{
cell = .{ .cell = .{ .char = ' ' } };
}
// We need to wrap wide chars with a spacer head.
if (cell.cell.attrs.wide and x == self.cols - 1) {
@ -2358,7 +2368,9 @@ pub fn resize(self: *Screen, rows: usize, cols: usize) !void {
y -= 1;
// Clear if our current cell is a wide spacer tail
clear_cell = cell.cell.attrs.wide_spacer_tail;
if (cell.cell.attrs.wide_spacer_tail) {
cell = .{ .cell = .{} };
}
}
row = self.getRow(.{ .active = y });
@ -2373,7 +2385,7 @@ pub fn resize(self: *Screen, rows: usize, cols: usize) !void {
// Write the cell
var new_cell = row.getCellPtr(x);
new_cell.* = if (clear_cell) .{} else cell.cell;
new_cell.* = cell.cell;
x += 1;
}
@ -5801,11 +5813,11 @@ test "Screen: resize less cols to eliminate wide char" {
{
var contents = try s.testString(alloc, .screen);
defer alloc.free(contents);
try testing.expectEqualStrings("", contents);
try testing.expectEqualStrings(" ", contents);
}
const cell = s.getCell(.screen, 0, 0);
try testing.expectEqual(@as(u32, 0), cell.char);
try testing.expectEqual(@as(u32, ' '), cell.char);
try testing.expect(!cell.attrs.wide);
try testing.expect(!cell.attrs.wide_spacer_tail);
try testing.expect(!cell.attrs.wide_spacer_head);
@ -5846,6 +5858,41 @@ test "Screen: resize less cols to wrap wide char" {
}
}
test "Screen: resize less cols to eliminate wide char with row space" {
const testing = std.testing;
const alloc = testing.allocator;
var s = try init(alloc, 2, 2, 0);
defer s.deinit();
const str = "😀";
try s.testWriteString(str);
{
var contents = try s.testString(alloc, .screen);
defer alloc.free(contents);
try testing.expectEqualStrings(str, contents);
}
{
const cell = s.getCell(.screen, 0, 0);
try testing.expectEqual(@as(u32, '😀'), cell.char);
try testing.expect(cell.attrs.wide);
try testing.expect(s.getCell(.screen, 0, 1).attrs.wide_spacer_tail);
}
try s.resize(2, 1);
{
var contents = try s.testString(alloc, .screen);
defer alloc.free(contents);
try testing.expectEqualStrings(" \n ", contents);
}
{
const cell = s.getCell(.screen, 0, 0);
try testing.expectEqual(@as(u32, ' '), cell.char);
try testing.expect(!cell.attrs.wide);
try testing.expect(!cell.attrs.wide_spacer_tail);
try testing.expect(!cell.attrs.wide_spacer_head);
}
}
test "Screen: resize more cols with wide spacer head" {
const testing = std.testing;
const alloc = testing.allocator;