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Get MessageSet IDs as a Compact String

Demonstrates the Chilkat MessageSet.ToCompactString method, which returns the unique identifiers in ascending order using compact IMAP message-set syntax, collapsing consecutive runs into inclusive ranges. It takes no arguments. This example loads 1,2,3,4,5,8,9,10 and prints the compact form 1:5,8:10.

Background: The result is canonical for the current set — unique, sorted, and range-compacted — which is the compact notation IMAP servers expect for message-set arguments. It is the inverse of FromCompactString, so the two round-trip: a set emitted here can be reloaded later. The string contains only numbers and omits the HasUids setting, so track UID-vs-sequence separately.

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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 MessageSet.ToCompactString method, which returns the unique identifiers in
    // ascending order using compact IMAP message-set syntax, with consecutive runs collapsed into
    // inclusive ranges.  It takes no arguments.

    const msg_set = try chilkat.MessageSet.init();
    defer msg_set.deinit();

    // Load a set of individual identifiers.
    msg_set.fromCompactString("1,2,3,4,5,8,9,10") catch {
        std.debug.print("{s}\n", .{try msg_set.getLastErrorText(alloc)});
        return;
    };

    // Get the canonical compact representation.
    const compact = try msg_set.toCompactString(alloc);
    std.debug.print("{s}\n", .{compact});
    // Output: 1:5,8:10
}