require 'optparse'
require 'optparse/time'
require 'ostruct'
require 'pp'
class OptparseExample
CODES = %w[iso-2022-jp shift_jis euc-jp utf8 binary]
CODE_ALIASES = { "jis" => "iso-2022-jp", "sjis" => "shift_jis" }
#
# Return a structure describing the options.
#
def self.parse(args)
# The options specified on the command line will be collected in *options*.
# We set default values here.
options = OpenStruct.new
options.library = []
options.books = []
options.download = []
options.xxxx = ''
options.getnew = 0
options.inplace = false
options.encoding = "utf8"
options.transfer_type = :auto
options.verbose = false
opt_parser = OptionParser.new do |opts|
opts.banner = "Usage: example.rb [options]"
opts.separator ""
opts.separator "Specific options:"
# Mandatory argument.
opts.on("-r", "--require LIBRARY",
"Require the LIBRARY before executing your script") do |lib|
options.library << lib
end
# Optional argument; multi-line description.
opts.on("-i", "--inplace [EXTENSION]",
"Edit ARGV files in place",
" (make backup if EXTENSION supplied)") do |ext|
options.inplace = true
options.extension = ext || ''
options.extension.sub!(/\A\.?(?=.)/, ".") # Ensure extension begins with dot.
end
# Cast 'days' argument to Integer.
opts.on("--getnew N", Integer, "Update DB with books added in past N days") do |n|
options.getnew = n
end
# Cast 'time' argument to a Time object.
opts.on("-t", "--time [TIME]", Time, "Begin execution at given time") do |time|
options.time = time
end
# List of arguments.
opts.on("--books x,y,z", Array, "Specify books") do |list|
options.books = list
end
# List of arguments.
opts.on("--summarize x,y,z", Array, "Specify books") do |list|
options.summarize = list
end
# List of arguments.
opts.on("--download x,y,z", Array, "Download books") do |list|
options.download = list
end
# Keyword completion. We are specifying a specific set of arguments (CODES
# and CODE_ALIASES - notice the latter is a Hash), and the user may provide
# the shortest unambiguous text.
code_list = (CODE_ALIASES.keys + CODES).join(',')
opts.on("--code CODE", CODES, CODE_ALIASES, "Select encoding",
" (#{code_list})") do |encoding|
options.encoding = encoding
end
# Optional argument with keyword completion.
opts.on("--type [TYPE]", [:text, :binary, :auto],
"Select transfer type (text, binary, auto)") do |t|
options.transfer_type = t
end
# Boolean switch.
opts.on("-v", "--[no-]verbose", "Run verbosely") do |v|
options.verbose = v
end
opts.separator ""
opts.separator "Common options:"
# No argument, shows at tail. This will print an options summary.
# Try it and see!
opts.on_tail("-h", "--help", "Show this message") do
puts opts
exit
end
# Another typical switch to print the version.
opts.on_tail("--version", "Show version") do
puts ::Version.join('.')
exit
end
end
opt_parser.parse!(args)
options
end # parse()
end # class OptparseExample
options = OptparseExample.parse(ARGV)
options = OptparseExample.parse(['--download', 'DB1,DB2,DB3', '--books', 'DB1,DB2,DB3', '--getnew', '30'])
pp options
pp options.days, options.books
options = OptparseExample.parse(['-h'])
pp options
pp ARGV
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