zterm/src/main.zig

const std = @import("std");
const zterm = @import("zterm");

const App = zterm.App(
    union(enum) {},
    zterm.Renderer.Direct,
    true,
);
const Key = zterm.Key;
const Layout = App.Layout;
const Widget = App.Widget;

const log = std.log.scoped(.default);

pub fn main() !void {
    errdefer |err| log.err("Application Error: {any}", .{err});

    var gpa: std.heap.GeneralPurposeAllocator(.{}) = .{};
    defer {
        const deinit_status = gpa.deinit();
        // fail test; can't try in defer as defer is executed after we return
        if (deinit_status == .leak) {
            log.err("memory leak", .{});
        }
    }
    const allocator = gpa.allocator();

    var app: App = .{};
    const renderer: App.Renderer = .{};
    // FIX: when not running fullscreen, the application needs to screen down accordingly to display the contents
    // -> size hint how much should it use?

    var layout = Layout.createFrom(layout: {
        var hstack = Layout.HStack.init(allocator, .{
            Widget.createFrom(blk: {
                var spacer = Widget.Spacer.init();
                break :blk &spacer;
            }),
            Layout.createFrom(framing: {
                var framing = Layout.Framing.init(allocator, .{
                    .layout = Layout.createFrom(
                        padding: {
                            var padding = Layout.Padding.init(allocator, 2, .{
                                .layout = Layout.createFrom(vstack: {
                                    var vstack = Layout.VStack.init(allocator, .{
                                        Widget.createFrom(blk: {
                                            const file = try std.fs.cwd().openFile("./src/app.zig", .{});
                                            defer file.close();
                                            var widget = Widget.RawText.init(allocator, file);
                                            break :blk &widget;
                                        }),
                                        Widget.createFrom(blk: {
                                            var spacer = Widget.Spacer.init();
                                            break :blk &spacer;
                                        }),
                                        Widget.createFrom(blk: {
                                            const file = try std.fs.cwd().openFile("./src/main.zig", .{});
                                            defer file.close();
                                            var widget = Widget.RawText.init(allocator, file);
                                            break :blk &widget;
                                        }),
                                    });
                                    break :vstack &vstack;
                                }),
                            });
                            break :padding &padding;
                        },
                    ),
                });
                break :framing &framing;
            }),
            Widget.createFrom(blk: {
                var spacer = Widget.Spacer.init();
                break :blk &spacer;
            }),
        });
        break :layout &hstack;
    });
    defer layout.deinit();

    try app.start();
    defer app.stop() catch unreachable;

    // App.Event loop
    while (true) {
        const event = app.nextEvent();
        log.debug("received event: {s}", .{@tagName(event)});

        switch (event) {
            .quit => break,
            .key => |key| {
                // ctrl+c to quit
                if (Key.matches(key, .{ .cp = 'c', .mod = .{ .ctrl = true } })) {
                    app.quit();
                }
                if (Key.matches(key, .{ .cp = 'n', .mod = .{ .ctrl = true } })) {
                    try app.interrupt();
                    defer app.start() catch @panic("could not start app event loop");
                    var child = std.process.Child.init(&.{"hx"}, allocator);
                    _ = child.spawnAndWait() catch |err| {
                        app.postEvent(.{
                            .err = .{
                                .err = err,
                                .msg = "Spawning Helix failed",
                            },
                        });
                    };
                }
            },
            .err => |err| {
                log.err("Received {any} with message: {s}", .{ err.err, err.msg });
            },
            else => {},
        }
        // NOTE: this currently re-renders the screen for every key-press -> which might be a bit of an overkill
        const events = try layout.handle(event);
        for (events.items) |e| {
            app.postEvent(e);
        }
        try layout.render(renderer);
    }
}