In PageTemplate, a project of mine with Brian Wisti, we provide a framework of sorts that has a large number of layers between the call to PageTemplate.output, and a point where the user's own code is later called.
If an error exists in the user's code, it looks somewhat like this:
/home/walker/public_html/deafcode/rbsource/user_instance.rb:3:in `fullname': undefined local variable or method `last_nam' for #<User:0xb7b92e38> (NameError)
from /usr/lib/ruby/site_ruby/1.8/PageTemplate/parser.rb:86:in `send'
from /usr/lib/ruby/site_ruby/1.8/PageTemplate/parser.rb:86:in `get'
from /usr/lib/ruby/site_ruby/1.8/PageTemplate/parser.rb:78:in `each'
from /usr/lib/ruby/site_ruby/1.8/PageTemplate/parser.rb:78:in `get'
from /usr/lib/ruby/site_ruby/1.8/PageTemplate/commands.rb:248:in `output'
from /usr/lib/ruby/site_ruby/1.8/PageTemplate/commands.rb:145:in `output'
from /usr/lib/ruby/site_ruby/1.8/PageTemplate/commands.rb:145:in `map'
from /usr/lib/ruby/site_ruby/1.8/PageTemplate/commands.rb:145:in `output'
... 13 levels...
from /usr/lib/ruby/site_ruby/1.8/PageTemplate/commands.rb:145:in `output'
from /usr/lib/ruby/site_ruby/1.8/PageTemplate/commands.rb:187:in `output'
from /home/walker/public_html/deafcode/rbsource/site.rb:90:in `output'
from index.cgi:23
About 23 levels of output of PageTemplate alone.
What I'd like is to shorten that to one:
/home/walker/public_html/deafcode/rbsource/user_instance.rb:3:in `fullname': undefined local variable or method `last_nam' for #<User:0xb7b92e38> (NameError)
from /usr/lib/ruby/site_ruby/1.8/PageTemplate/commands.rb:187:in `output'
from /home/walker/public_html/deafcode/rbsource/site.rb:90:in `output'
from index.cgi:23
Is there any safe way to do this?
Alternately, I'd also like to potentially generate output like this:
/home/walker/public_html/deafcode/rbsource/user_instance.rb:3:in `fullname': undefined local variable or method `last_nam' for #<User:0xb7b92e38> (NameError)
from Template:user_profile.html in "Value: user.fullname"
from Template:user_profile.html in "If: user"
from Template:main_page.html in "Include user_profile.html"
from Template:main_page.html in "Loop users: user"
from /usr/lib/ruby/site_ruby/1.8/PageTemplate/commands.rb:187:in `output'
from /home/walker/public_html/deafcode/rbsource/site.rb:90:in `output'
from index.cgi:23
Considerably more useful for the developer using PT.
Is it possible to modify the backtrace like this?
Thanks,
- Greg
You could expand on this theme:
#!/usr/bin/ruby
def recurse(i)
raise "No more recursion please" if i == 0
recurse_a(i-1)
end
def recurse_a(i)
recurse(i)
end
begin
recurse(1000)
rescue => e
puts e.inspect
puts e.backtrace[0], '...', e.backtrace[-2..-1]
end
regards,
Brian
···
On 29/04/05, Greg Millam <ruby-talk@lethalcode.net> wrote:
In PageTemplate, a project of mine with Brian Wisti, we provide a
framework of sorts that has a large number of layers between the call to
PageTemplate.output, and a point where the user's own code is later called.
If an error exists in the user's code, it looks somewhat like this:
/home/walker/public_html/deafcode/rbsource/user_instance.rb:3:in
`fullname': undefined local variable or method `last_nam' for
#<User:0xb7b92e38> (NameError)
from /usr/lib/ruby/site_ruby/1.8/PageTemplate/parser.rb:86:in `send'
from /usr/lib/ruby/site_ruby/1.8/PageTemplate/parser.rb:86:in `get'
from /usr/lib/ruby/site_ruby/1.8/PageTemplate/parser.rb:78:in `each'
from /usr/lib/ruby/site_ruby/1.8/PageTemplate/parser.rb:78:in `get'
from /usr/lib/ruby/site_ruby/1.8/PageTemplate/commands.rb:248:in `output'
from /usr/lib/ruby/site_ruby/1.8/PageTemplate/commands.rb:145:in `output'
from /usr/lib/ruby/site_ruby/1.8/PageTemplate/commands.rb:145:in `map'
from /usr/lib/ruby/site_ruby/1.8/PageTemplate/commands.rb:145:in `output'
... 13 levels...
from /usr/lib/ruby/site_ruby/1.8/PageTemplate/commands.rb:145:in `output'
from /usr/lib/ruby/site_ruby/1.8/PageTemplate/commands.rb:187:in `output'
from /home/walker/public_html/deafcode/rbsource/site.rb:90:in `output'
from index.cgi:23
About 23 levels of output of PageTemplate alone.
What I'd like is to shorten that to one:
/home/walker/public_html/deafcode/rbsource/user_instance.rb:3:in
`fullname': undefined local variable or method `last_nam' for
#<User:0xb7b92e38> (NameError)
from /usr/lib/ruby/site_ruby/1.8/PageTemplate/commands.rb:187:in `output'
from /home/walker/public_html/deafcode/rbsource/site.rb:90:in `output'
from index.cgi:23
Is there any safe way to do this?
Alternately, I'd also like to potentially generate output like this:
/home/walker/public_html/deafcode/rbsource/user_instance.rb:3:in
`fullname': undefined local variable or method `last_nam' for
#<User:0xb7b92e38> (NameError)
from Template:user_profile.html in "Value: user.fullname"
from Template:user_profile.html in "If: user"
from Template:main_page.html in "Include user_profile.html"
from Template:main_page.html in "Loop users: user"
from /usr/lib/ruby/site_ruby/1.8/PageTemplate/commands.rb:187:in `output'
from /home/walker/public_html/deafcode/rbsource/site.rb:90:in `output'
from index.cgi:23
Considerably more useful for the developer using PT.
Is it possible to modify the backtrace like this?
Thanks,
- Greg
--
http://ruby.brian-schroeder.de/
multilingual _non rails_ ruby based vocabulary trainer:
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