Lua

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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Lua

local chilkat = require("chilkat")

-- 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.

local msgSet = chilkat.MessageSet.new()

-- Load a set of individual identifiers.
local success = msgSet:from_compact_string("1,2,3,4,5,8,9,10")
if not success then
    print(msgSet.last_error_text)
    return
end

-- Get the canonical compact representation.
local compact = msgSet:to_compact_string()
print(compact)
-- Output: 1:5,8:10