Draw name of active command in the corner

Will break when/if multiple commands are active though.  🤔

zig/sdl/hello_sdl.zig

@@ -561,7 +561,8 @@ pub fn main() !void {
        _ = c.SDL_RenderClear(renderer);
        // thanks to https://stackoverflow.com/questions/22886500/how-to-render-text-in-sdl2 for some actually useful code here
        const white: c.SDL_Color = c.SDL_Color{ .r = 255, .g = 255, .b = 255, .a = 255 };
        const white: c.SDL_Color = c.SDL_Color{ .r = 255, .g = 255, .b = 255, .a = 0 };
        const gray: c.SDL_Color = c.SDL_Color{ .r = 150, .g = 150, .b = 150, .a = 255 };
        const black: c.SDL_Color = c.SDL_Color{ .r = 0, .g = 0, .b = 0, .a = 100 };
        // Shaded vs Solid gives a nicer output, with solid the output
        // was squiggly and not aligned with a baseline.
@@ -576,6 +577,16 @@ pub fn main() !void {
                continue;
            }
            {
                const name = try gpa.dupeZ(u8, command.name);
                const result_text = c.TTF_RenderUTF8_Shaded(font, name, gray, c.SDL_Color{ .r = 0, .g = 0, .b = 0, .a = 255 });
                gpa.free(name);
                const result_texture = c.SDL_CreateTextureFromSurface(renderer, result_text);
                _ = c.SDL_RenderCopy(renderer, result_texture, null, &c.SDL_Rect{ .x = window_width - @intCast(c_int, command.name.len) * glyph_width, .y = 0, .w = @intCast(c_int, command.name.len) * glyph_width, .h = glyph_height });
                c.SDL_FreeSurface(result_text);
                c.SDL_DestroyTexture(result_texture);
            }
            //std.debug.print("{s} {d} {d}\n", .{ command.process.is_running(), command.process.stdout_buf.items.len, command.process.stdout_buf.capacity });
            var lines = std.mem.split(u8, try command.output(), "\n");
            var line = lines.next();