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Start IMAP IDLE to Monitor a Mailbox

Demonstrates the Chilkat Imap.IdleStart method, which sends the IMAP IDLE command to begin listening for unsolicited mailbox updates. It takes no arguments. A mailbox must first be selected, and the server must advertise the IDLE capability.

Background: IDLE is IMAP's push mechanism: instead of polling for new mail, the client tells the server "notify me when something changes," and the server pushes updates as they happen. This is what enables near-instant new-mail alerts. While IDLE is active, no other IMAP command may be sent on that connection — call IdleDone to leave IDLE before issuing other commands.

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

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    // Demonstrates the Imap.IdleStart method, which sends the IMAP IDLE command to begin listening
    // for unsolicited mailbox updates.  It takes no arguments.  A mailbox must be selected and the
    // server must advertise the IDLE capability.

    const imap = try chilkat.Imap.init();
    defer imap.deinit();

    imap.setSsl(true);
    imap.setPort(993);

    imap.connect("imap.example.com") catch {
        std.debug.print("{s}\n", .{try imap.getLastErrorText(alloc)});
        return;
    };

    imap.login("user@example.com", "myPassword") catch {
        std.debug.print("{s}\n", .{try imap.getLastErrorText(alloc)});
        return;
    };

    imap.selectMailbox("Inbox") catch {
        std.debug.print("{s}\n", .{try imap.getLastErrorText(alloc)});
        return;
    };

    // Enter IDLE mode to monitor the mailbox for changes (new mail, deletions, flag changes).
    imap.idleStart() catch {
        std.debug.print("{s}\n", .{try imap.getLastErrorText(alloc)});
        return;
    };

    std.debug.print("IDLE mode started.\n", .{});

    // While IDLE is active, no other IMAP command may be sent.  End IDLE before doing more work.
    imap.idleDone() catch {
        std.debug.print("{s}\n", .{try imap.getLastErrorText(alloc)});
        return;
    };

    imap.disconnect() catch {
        std.debug.print("{s}\n", .{try imap.getLastErrorText(alloc)});
        return;
    };
}