Issue #20328 has been reported by postmodern (Hal Brodigan). ---------------------------------------- Bug #20328: optparse omits the option's description in the --help output if the description is an Array https://bugs.ruby-lang.org/issues/20328 * Author: postmodern (Hal Brodigan) * Status: Open * ruby -v: ruby 3.2.2 (2023-03-30 revision e51014f9c0) [x86_64-linux] * Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN ---------------------------------------- If you define an option using `OptionParser#on`, but give the option's description as a multi-line Array, then the option's description is omitted from the `--help` output. ## Steps To Reproduce ```ruby #!/usr/bin/env ruby require 'optparse' optparser = OptionParser.new do |opts| opts.banner = 'usage: test.rb [options]' opts.on('-o', '--opt [OPT]', 'Line one') do |opt| end opts.on('-m', '--multiline-opt', ['Line one', 'Line two']) do |test| end opts.on('-h', '--help', 'Prints this help') do puts opts exit end end optparser.parse(['--help']) ``` ### Expected result ``` usage: test.rb [options] -o, --opt [OPT] Line one -m, --multiline-opt Line one Line two -h, --help Prints this help ``` ### Actual Result ``` usage: test.rb [options] -o, --opt [OPT] Line one -m, --multiline-opt -h, --help Prints this help ``` or an `ArgumentError` should be raised if Array descriptions are not allowed/supported. ## Version Info Tested against optparse 0.1.0, 0.2.0, 0.3.1, and the master branch. -- https://bugs.ruby-lang.org/