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vaxis: add panic handler function
Applications may use this to handle panics gracefully
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src/main.zig
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src/main.zig
···
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const std = @import("std");
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const builtin = @import("builtin");
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pub const Vaxis = @import("Vaxis.zig");
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pub const Loop = @import("Loop.zig").Loop;
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pub const xev = @import("xev.zig");
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pub const Queue = @import("queue.zig").Queue;
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pub const Key = @import("Key.zig");
···
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pub const widgets = @import("widgets.zig");
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pub const gwidth = @import("gwidth.zig");
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pub const ctlseqs = @import("ctlseqs.zig");
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/// Initialize a Vaxis application.
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pub fn init(alloc: std.mem.Allocator, opts: Vaxis.Options) !Vaxis {
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return Vaxis.init(alloc, opts);
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}
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/// Resets terminal state on a panic, then calls the default zig panic handler
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pub fn panic_handler(msg: []const u8, error_return_trace: ?*std.builtin.StackTrace, ret_addr: ?usize) noreturn {
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if (Tty.global_tty) |gty| {
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const reset: []const u8 = ctlseqs.csi_u_pop ++
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ctlseqs.mouse_reset ++
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ctlseqs.bp_reset ++
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ctlseqs.rmcup;
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gty.anyWriter().writeAll(reset) catch {};
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gty.deinit();
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}
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std.builtin.default_panic(msg, error_return_trace, ret_addr);
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}
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/// the vaxis logo. In PixelCode
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src/tty.zig
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src/tty.zig
···
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var handler_mutex: std.Thread.Mutex = .{};
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var handler_idx: usize = 0;
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/// global tty instance, used in case of a panic. Not guaranteed to work if
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/// for some reason there are multiple TTYs open under a single vaxis
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/// compilation unit - but this is better than nothing
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pub var global_tty: ?PosixTty = null;
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/// initializes a Tty instance by opening /dev/tty and "making it raw". A
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/// signal handler is installed for SIGWINCH. No callbacks are installed, be
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/// sure to register a callback when initializing the event loop
···
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};
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try posix.sigaction(posix.SIG.WINCH, &act, null);
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return .{
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const self: PosixTty = .{
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.fd = fd,
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.termios = termios,
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};
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global_tty = self;
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return self;
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}
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/// release resources associated with the Tty return it to its original state