a modern tui library written in zig
rockorager.dev
1const std = @import("std");
2const vaxis = @import("../main.zig");
3
4const digits = "0123456789";
5
6num_lines: usize = std.math.maxInt(usize),
7highlighted_line: usize = 0,
8style: vaxis.Style = .{ .dim = true },
9highlighted_style: vaxis.Style = .{ .dim = true, .bg = .{ .index = 0 } },
10
11pub fn extractDigit(v: usize, n: usize) usize {
12 return (v / (std.math.powi(usize, 10, n) catch unreachable)) % 10;
13}
14
15pub fn numDigits(v: usize) u8 {
16 return switch (v) {
17 0...9 => 1,
18 10...99 => 2,
19 100...999 => 3,
20 1000...9999 => 4,
21 10000...99999 => 5,
22 100000...999999 => 6,
23 1000000...9999999 => 7,
24 10000000...99999999 => 8,
25 else => 0,
26 };
27}
28
29pub fn draw(self: @This(), win: vaxis.Window, y_scroll: usize) void {
30 for (1 + y_scroll..self.num_lines) |line| {
31 if (line - 1 >= y_scroll +| win.height) {
32 break;
33 }
34 const highlighted = line == self.highlighted_line;
35 const num_digits = numDigits(line);
36 for (0..num_digits) |i| {
37 const digit = extractDigit(line, i);
38 win.writeCell(@intCast(win.width -| (i + 2)), @intCast(line -| (y_scroll +| 1)), .{
39 .char = .{
40 .width = 1,
41 .grapheme = digits[digit .. digit + 1],
42 },
43 .style = if (highlighted) self.highlighted_style else self.style,
44 });
45 }
46 if (highlighted) {
47 for (num_digits + 1..win.width) |i| {
48 win.writeCell(@intCast(i), @intCast(line -| (y_scroll +| 1)), .{
49 .style = if (highlighted) self.highlighted_style else self.style,
50 });
51 }
52 }
53 }
54}