rescue block doesn't get run

[Hacksaw]

This code snippet processes the options correctly, but if I leave off a
required argument, it fails run my rescue block.

Why is that?

begin
opts = GetoptLong.new(
[ "--in", "-f", GetoptLong::REQUIRED_ARGUMENT ],
[ "--out", "-o", GetoptLong::REQUIRED_ARGUMENT ],
[ "--version", GetoptLong::NO_ARGUMENT ],
[ "--help", "-h", "-?", GetoptLong::NO_ARGUMENT ]
)

rescue GetoptLong::MissingArgument
$stderr.print "Missing Argument"
raise
end

 

[Ara.T.Howard]

Date: Tue, 16 Dec 2003 22:48:11 +0900
From: Hacksaw <[email protected]>
Newsgroups: comp.lang.ruby
Subject: rescue block doesn't get run

This code snippet processes the options correctly, but if I leave off a
required argument, it fails run my rescue block.

Why is that?

begin
opts = GetoptLong.new(
[ "--in", "-f", GetoptLong::REQUIRED_ARGUMENT ],
[ "--out", "-o", GetoptLong::REQUIRED_ARGUMENT ],
[ "--version", GetoptLong::NO_ARGUMENT ],
[ "--help", "-h", "-?", GetoptLong::NO_ARGUMENT ]
)

rescue GetoptLong::MissingArgument
$stderr.print "Missing Argument"
raise
end

/tmp > cat foo.rb
begin
opts = GetoptLong.new(
[ "--in", "-f", GetoptLong::REQUIRED_ARGUMENT ],
[ "--out", "-o", GetoptLong::REQUIRED_ARGUMENT ],
[ "--version", GetoptLong::NO_ARGUMENT ],
[ "--help", "-h", "-?", GetoptLong::NO_ARGUMENT ]
)

rescue Exception => e
STDERR.printf "%s\n(%s)\n%s\n", e.class, e, e.backtrace.join("\n")
end

/tmp > ruby foo.rb
NameError
(uninitialized constant GetoptLong)
foo.rb:2

/tmp > ruby -rgetoptlong foo.rb


because the error thrown is a NameError and you catch only
GetoptLong::MissingArgument. you just need to add:

require 'getoptlong'

to your script! ;-)

-a
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[Yukihiro Matsumoto]

Hi,

In message "rescue block doesn't get run"

|This code snippet processes the options correctly, but if I leave off a
|required argument, it fails run my rescue block.
|
|Why is that?

Perhaps you forgot to call GetoptLong#get or #each.

matz.

 

[nobu.nokada]

Hi,

At Tue, 16 Dec 2003 22:48:11 +0900,

This code snippet processes the options correctly, but if I leave off a
required argument, it fails run my rescue block. (snip)
rescue GetoptLong::MissingArgument
$stderr.print "Missing Argument"
raise

Don't you re-raise the exception?