Fetch a Text IMAP Attachment into a StringBuilder

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Demonstrates the Chilkat Imap.FetchAttachmentSb method, which decodes one text attachment into a StringBuilder. The first argument is the Email, the second is the zero-based attachment index, the third is the charset used to decode the bytes, and the fourth is the StringBuilder, which is cleared first. This example decodes the first attachment as UTF-8.

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

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

    // Demonstrates the Imap.FetchAttachmentSb method, which downloads one text attachment and
    // decodes it into a StringBuilder.  The 1st argument is the Email, the 2nd is the zero-based
    // attachment index, the 3rd is the charset used to decode, and the 4th is the StringBuilder
    // (cleared first).
    //
    // The message is fetched headers-only, then the attachment is downloaded on demand.

    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;
    };

    // Fetch only the message headers.  Attachment bodies are NOT downloaded, but the ckx-imap-*
    // metadata describing the attachments is present, so the attachment info methods still work.
    const headers_only = true;
    const use_uid = false;
    const seq_num = 1;
    const email = try chilkat.Email.init();
    defer email.deinit();
    imap.fetchEmail(headers_only, @as(u32, @intCast(seq_num)), use_uid, email) catch {
        std.debug.print("{s}\n", .{try imap.getLastErrorText(alloc)});
        return;
    };

    const num_attach = imap.getMailNumAttach(email);
    if (num_attach > 0) {
        // Download the first (text) attachment and decode it as UTF-8.  Use this only for text.
        const sb = try chilkat.StringBuilder.init();
        defer sb.deinit();
        imap.fetchAttachmentSb(email, 0, "utf-8", sb) catch {
            std.debug.print("{s}\n", .{try imap.getLastErrorText(alloc)});
            return;
        };

        const attach_text = try sb.getAsString(alloc);
        std.debug.print("{s}\n", .{attach_text});
    }

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