From: matt@... (Matt Neuburg)
Date: 2011-03-02T10:59:58+09:00
Subject: "ri 'Array.[]'" fails

The ri --help says:

> Note that shell quoting or escaping may be required for method names 
> containing punctuation:
> 
>     ri 'Array.[]'

Okay, so let's try it:

jansen:~ mattleopard$ ri 'Array.[]'
/Library/Ruby/Gems/1.8/gems/rdoc-3.5.3/lib/rdoc/ri/driver.rb:1001:
warning: character class has `]' without escape
/Library/Ruby/Gems/1.8/gems/rdoc-3.5.3/lib/rdoc/ri/driver.rb:1001:in
`name_regexp': premature end of regular expression: /^Array(#|::)[]$/
(RegexpError)
        from
/Library/Ruby/Gems/1.8/gems/rdoc-3.5.3/lib/rdoc/ri/driver.rb:762:in
`filter_methods'
        from
/Library/Ruby/Gems/1.8/gems/rdoc-3.5.3/lib/rdoc/ri/driver.rb:654:in
`display_method'
        from
/Library/Ruby/Gems/1.8/gems/rdoc-3.5.3/lib/rdoc/ri/driver.rb:695:in
`display_name'
        from
/Library/Ruby/Gems/1.8/gems/rdoc-3.5.3/lib/rdoc/ri/driver.rb:720:in
`display_names'
        from
/Library/Ruby/Gems/1.8/gems/rdoc-3.5.3/lib/rdoc/ri/driver.rb:717:in
`each'
        from
/Library/Ruby/Gems/1.8/gems/rdoc-3.5.3/lib/rdoc/ri/driver.rb:717:in
`display_names'
        from
/Library/Ruby/Gems/1.8/gems/rdoc-3.5.3/lib/rdoc/ri/driver.rb:1072:in
`run'
        from
/Library/Ruby/Gems/1.8/gems/rdoc-3.5.3/lib/rdoc/ri/driver.rb:317:in
`run'
        from /Library/Ruby/Gems/1.8/gems/rdoc-3.5.3/bin/ri:5
        from /usr/bin/ri:19:in `load'
        from /usr/bin/ri:19

My guess is that ri is trying to be clever with some sort of regex
guesswork in case I get the command wrong, but is getting hoist on its
own petard. m.

-- 
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