Hi there,
I wrote my own Wake on Lan Script in ruby that uses a Plist to look up
either target Mac address by selected printer or target MAC address by
server and I use option parser for this.
It all works fine if the arguments are input correctly, but if the
arguments are off you get something like this. -x is not declared in my
options and was a test to see how it did when it got something that it
didn't recognize.
ruby test.rb -x
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/optparse.rb:1443:in
`complete': invalid option: -x (OptionParser::InvalidOption)
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/optparse.rb:1441:in
`catch'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/optparse.rb:1441:in
`complete'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/optparse.rb:1280:in
`parse_in_order'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/optparse.rb:1247:in
`catch'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/optparse.rb:1247:in
`parse_in_order'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/optparse.rb:1241:in
`order!'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/optparse.rb:1332:in
`permute!'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/optparse.rb:1353:in
`parse!'
from test.rb:4
It's not the end of the world as if the options are wrong then it won't
do anything anyway, but I was wondering if anyone could tell me if
there's any method in the class or extra thing I could do to catch dodgy
arguments and output the help file or the banner rather than this
inelegant list of errors?
Thanks in advance.
···
--
Posted via http://www.ruby-forum.com/.
Alle Saturday 18 October 2008, Adam Penny ha scritto:
Hi there,
I wrote my own Wake on Lan Script in ruby that uses a Plist to look up
either target Mac address by selected printer or target MAC address by
server and I use option parser for this.
It all works fine if the arguments are input correctly, but if the
arguments are off you get something like this. -x is not declared in my
options and was a test to see how it did when it got something that it
didn't recognize.
ruby test.rb -x
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/opt
parse.rb:1443:in `complete': invalid option: -x
(OptionParser::InvalidOption)
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/opt
parse.rb:1441:in `catch'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/opt
parse.rb:1441:in `complete'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/opt
parse.rb:1280:in `parse_in_order'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/opt
parse.rb:1247:in `catch'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/opt
parse.rb:1247:in `parse_in_order'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/opt
parse.rb:1241:in `order!'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/opt
parse.rb:1332:in `permute!'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/opt
parse.rb:1353:in `parse!'
from test.rb:4
It's not the end of the world as if the options are wrong then it won't
do anything anyway, but I was wondering if anyone could tell me if
there's any method in the class or extra thing I could do to catch dodgy
arguments and output the help file or the banner rather than this
inelegant list of errors?
Thanks in advance.
I guess you can enclose the call to OptionParser#parse! in a begin/rescue
expression, rescuing OptionParser::InvalidOption or OptionParser::ParseError
(which is the parent of InvalidOption) and display an error message. Here's a
simple example of how you can do it:
require 'optparse'
o = OptionParser.new do |o|
o.banner = "test usage: test [OPTIONS]"
o.on('-o', '--option', 'this option does nothing '){}
end
begin o.parse! ARGV
rescue OptionParser::InvalidOption => e
puts e
puts o
exit 1
end
the line
puts e
will display a message like
invalid option -a
(where -a is the invalid option passed to the script). The line
puts o
will display the usage message.
exit 1
will make the script exit with the error code 1.
I hope this helps
Stefano
Stefano, that's a very big help, thank you very much!
Adam
···
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Posted via http://www.ruby-forum.com/.
PennyMBP:~ adam$ wopol -l
invalid option: -l
Usage: wopol [options]
-s, --server SERVERNAME
-p, --printer PRINTERNAME
-w, --wait SECONDS
Thought you might like to see the result after implementing your
suggestion. 
Thanks again.
···
--
Posted via http://www.ruby-forum.com/.
Thanks again.