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Load a MessageSet from a Compact String

Demonstrates the Chilkat MessageSet.FromCompactString method, which clears the set and loads message identifiers from compact IMAP message-set syntax. The only argument is the compact string: a colon specifies an inclusive ascending range, and commas separate values or ranges. This example loads 1:5,8:10 and prints the result as a comma-separated list.

Background: Compact message-set syntax is how IMAP itself expresses groups of messages — 1:5,8:10 is far more concise than listing every id. FromCompactString is the inverse of ToCompactString: it parses that text into a set you can pass to Imap methods. Duplicates are removed, identifiers are sorted ascending, and the existing HasUids setting is preserved. Note the string carries only the numbers — it does not record whether they are UIDs or sequence numbers.

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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.FromCompactString method, which loads a set of message
    // identifiers from compact IMAP message-set syntax.  The only argument is the compact string.
    // A colon specifies an inclusive range, and commas separate values or ranges.

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

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

    std.debug.print("Count: {d}\n", .{msg_set.getCount()});

    // Show the loaded identifiers in comma-separated form.
    const csv = try msg_set.toCommaSeparatedStr(alloc);
    std.debug.print("{s}\n", .{csv});
}