101 lines
3.3 KiB
Zig
101 lines
3.3 KiB
Zig
const std = @import("std");
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const vaxis = @import("vaxis");
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const Cell = vaxis.Cell;
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const TextInput = vaxis.widgets.TextInput;
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const border = vaxis.widgets.border;
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const log = std.log.scoped(.main);
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pub fn main() !void {
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var gpa = std.heap.GeneralPurposeAllocator(.{}){};
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defer {
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const deinit_status = gpa.deinit();
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//fail test; can't try in defer as defer is executed after we return
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if (deinit_status == .leak) {
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log.err("memory leak", .{});
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}
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}
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const alloc = gpa.allocator();
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// Initialize Vaxis
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var vx = try vaxis.init(Event, .{});
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defer vx.deinit(alloc);
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// Start the read loop. This puts the terminal in raw mode and begins
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// reading user input
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try vx.start();
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defer vx.stop();
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// Optionally enter the alternate screen
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try vx.enterAltScreen();
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// We'll adjust the color index every keypress for the border
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var color_idx: u8 = 0;
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var text_input = TextInput.init(alloc);
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defer text_input.deinit();
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try vx.queryTerminal();
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// The main event loop. Vaxis provides a thread safe, blocking, buffered
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// queue which can serve as the primary event queue for an application
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outer: while (true) {
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// nextEvent blocks until an event is in the queue
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const event = vx.nextEvent();
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log.debug("event: {}\r\n", .{event});
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// exhaustive switching ftw. Vaxis will send events if your EventType
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// enum has the fields for those events (ie "key_press", "winsize")
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switch (event) {
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.key_press => |key| {
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color_idx = switch (color_idx) {
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255 => 0,
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else => color_idx + 1,
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};
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if (key.matches('c', .{ .ctrl = true })) {
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break :outer;
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} else if (key.matches('l', .{ .ctrl = true })) {
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vx.queueRefresh();
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} else {
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try text_input.update(.{ .key_press = key });
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}
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},
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.winsize => |ws| {
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try vx.resize(alloc, ws);
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},
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else => {},
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}
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// vx.window() returns the root window. This window is the size of the
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// terminal and can spawn child windows as logical areas. Child windows
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// cannot draw outside of their bounds
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const win = vx.window();
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// Clear the entire space because we are drawing in immediate mode.
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// vaxis double buffers the screen. This new frame will be compared to
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// the old and only updated cells will be drawn
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win.clear();
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const child = win.initChild(
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win.width / 2 - 20,
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win.height / 2 - 3,
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.{ .limit = 40 },
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.{ .limit = 3 },
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);
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// draw the text_input using a bordered window
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const style: vaxis.Style = .{
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.fg = .{ .index = color_idx },
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};
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text_input.draw(border.all(child, style));
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// Render the screen
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try vx.render();
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}
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}
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// Our EventType. This can contain internal events as well as Vaxis events.
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// Internal events can be posted into the same queue as vaxis events to allow
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// for a single event loop with exhaustive switching. Booya
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const Event = union(enum) {
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key_press: vaxis.Key,
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winsize: vaxis.Winsize,
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focus_in,
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foo: u8,
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};
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