Simple option parser
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# This is now a gem | |
# https://rubygems.org/gems/parseopt | |
class ParseOpt | |
class Option | |
attr_reader :short, :long, :help | |
def initialize(short, long, help, &block) | |
@block = block | |
@short = short | |
@long = long | |
@help = help | |
end | |
def call(v) | |
@block.call(v) || true | |
end | |
end | |
private_constant :Option | |
def initialize(usage = nil) | |
@list = {} | |
@usage = usage | |
yield self if block_given? | |
end | |
def on(short, long = nil, help = nil, &block) | |
opt = Option.new(short, long, help, &block) | |
@list[short] = opt if short | |
@list[long] = opt if long | |
end | |
def parse(args = ARGV) | |
if args.member?('-h') or args.member?('--help') | |
usage | |
exit 0 | |
end | |
seen_dash = false | |
args.delete_if do |cur| | |
opt = val = nil | |
next false if cur[0] != '-' or seen_dash | |
case cur | |
when '--' | |
seen_dash = true | |
next true | |
when /^--no-(.+)$/ | |
opt = @list[$1] | |
val = false | |
when /^-([^-])(.+)?$/, /^--(.+?)(?:=(.+))?$/ | |
opt = @list[$1] | |
val = $2 || true | |
end | |
opt&.call(val) | |
end | |
end | |
def usage=(value) | |
@usage = value | |
end | |
def usage | |
puts 'usage: %s' % @usage | |
@list.values.uniq.each do |opt| | |
s = ' ' | |
s << '' | |
s << [opt.short&.prepend('-'), opt.long&.prepend('--')].compact.join(', ') | |
s << '' | |
s << '%*s%s' % [26 - s.size, '', opt.help] if opt.help | |
puts s | |
end | |
end | |
end | |
$str = 'default' | |
$num = 0 | |
$bool = false | |
opts = ParseOpt.new | |
opts.usage = 'git foo' | |
opts.on('b', 'bool', 'Boolean') do |v| | |
$bool = v | |
end | |
opts.on('s', 'string', 'String') do |v| | |
$str = v | |
end | |
opts.on('n', 'number', 'Number') do |v| | |
$num = v.to_i | |
end | |
opts.parse |
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Really nice and usefull. Thanks!