webgen users - Aug 2012 - comparison of Webgen::Tag::Menu::MenuNode with Webgen::Tag::Menu::MenuNode failed

Hello,

since some while now I am in the process of migrating my older website 
(which is using
Dokuwiki) to a Webgen-powered one. The major part of the contents is a 
blog, which by
now has accumulated nine years written entries. While I am well prepared to 
have the rebuilding of the website from the sources take some time, there 
is one type of error I keep running into, which prevents me from completing 
the generation of site time and time again:

...done in 39.0825 seconds
Updating tree...
An error has occurred:
  Error while working on </blog/2007/2007-01/2007-01-14_11-08.en.html>:
    comparison of Webgen::Tag::Menu::MenuNode with 
Webgen::Tag::Menu::MenuNode failed

Of course I already have been running some online search, but until now I 
have come up dry with hints to get to the bottom of this; by now I should 
have run webgen will all sorts of extra options to provide me with some 
output, which might help pinning down the problem - however all I am 
getting is the above error message. The file and its syntax are sound. 
Temporarily moving the source file out of the way will cause the error to 
be shifted to another file, which again is fine in terms of syntax.

Any help or suggestions for further debugging would be appreciated.

Cheers,

Lars Baehren


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Hi,

On 2012-08-01 02:58 -0700 Lars B?hren wrote:
> ...done in 39.0825 seconds
> Updating tree...
> An error has occurred:
>   Error while working on
> </blog/2007/2007-01/2007-01-14_11-08.en.html>: comparison of
> Webgen::Tag::Menu::MenuNode with Webgen::Tag::Menu::MenuNode failed
> 
> Of course I already have been running some online search, but until
> now I have come up dry with hints to get to the bottom of this; by
> now I should have run webgen will all sorts of extra options to
> provide me with some output, which might help pinning down the
> problem - however all I am getting is the above error message. The
> file and its syntax are sound. Temporarily moving the source file out
> of the way will cause the error to be shifted to another file, which
> again is fine in terms of syntax.
I haven''t really seen this error until now. You can enable more
debugging by running webgen this way:

ruby -d -S webgen -v -l 0

If this does not give you a hint where the error lies, maybe you can
send me your sources (or a trimmed down version where the error still
occurs) and send it to me, so that I can have a look at it!

Best regards,
  Thomas

Thanks Thomas for the reply... and sorry for being somewhat slow following 
up on your suggestions.

I ran Webgen in the way you suggested, leaving me with the impression that 
there might be something funny with my Ruby installation to begin with (I 
have to admit though that I am not too much of a Ruby expert yet to 
properly judge this):

Exception `LoadError'' at 
/opt/local/lib/ruby/vendor_ruby/1.8/rubygems.rb:1113 - no such file to load 
-- rubygems/defaults/operating_system
Exception `LoadError'' at 
/opt/local/lib/ruby/vendor_ruby/1.8/rubygems/config_file.rb:50 - no such 
file to load -- Win32API
Exception `NoMethodError'' at /opt/local/lib/ruby/1.8/rational.rb:78 - 
undefined method `gcd'' for Rational(1, 2):Rational
Exception `TypeError'' at 
/opt/local/lib/ruby/gems/1.8/gems/webgen-0.5.14/lib/webgen/website.rb:335 - 
instance of IO needed
Starting webgen...
Updating tree...
...done in 5.3541 seconds
Writing changed nodes...

One the update of the tree has completed, the generation of the webpages 
starts:

Writing changed nodes...
    /bg.gif
Exception `Errno::EEXIST'' at /opt/local/lib/ruby/1.8/fileutils.rb:243 -
File exists - /Users/lars/Sites/larsbaehren.com/release/website
Exception `NoMethodError'' at 
/opt/local/lib/ruby/gems/1.8/gems/webgen-0.5.14/lib/webgen/node.rb:218 - 
undefined method `coerce'' for "Upcoming blog entries":String
Exception `ArgumentError'' at 
/opt/local/lib/ruby/gems/1.8/gems/webgen-0.5.14/lib/webgen/tag/menu.rb:40 - 
comparison of Webgen::Tag::Menu::MenuNode with Webgen::Tag::Menu::MenuNode 
failed
Exception `Webgen::RenderError'' at 
/opt/local/lib/ruby/gems/1.8/gems/webgen-0.5.14/lib/webgen/sourcehandler.rb:170 
- comparison of Webgen::Tag::Menu::MenuNode with 
Webgen::Tag::Menu::MenuNode failed
Exception `Webgen::RenderError'' at 
/opt/local/lib/ruby/gems/1.8/gems/webgen-0.5.14/lib/webgen/sourcehandler.rb:78 
- comparison of Webgen::Tag::Menu::MenuNode with 
Webgen::Tag::Menu::MenuNode failed
An error has occurred:
  Error while rendering </blog/2003.en.html>:
    comparison of Webgen::Tag::Menu::MenuNode with 
Webgen::Tag::Menu::MenuNode failed

I do get the suspicion that effects from the first error messages trickle 
down the line, but I am not quite sure what to look for exactly.

Best regards,

Lars

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On 2012-08-08 01:24 -0700 Lars B?hren wrote:
> Exception `LoadError'' at 
> /opt/local/lib/ruby/vendor_ruby/1.8/rubygems.rb:1113 - no such file
> to load -- rubygems/defaults/operating_system
> Exception `LoadError'' at 
> /opt/local/lib/ruby/vendor_ruby/1.8/rubygems/config_file.rb:50 - no
> such file to load -- Win32API
> Exception `NoMethodError'' at
/opt/local/lib/ruby/1.8/rational.rb:78 -
> undefined method `gcd'' for Rational(1, 2):Rational
> Exception `TypeError'' at 
> /opt/local/lib/ruby/gems/1.8/gems/webgen-0.5.14/lib/webgen/website.rb:335
> - instance of IO needed
> Starting webgen...
> Updating tree...
> ...done in 5.3541 seconds
> Writing changed nodes...
All the above errors can be ignored. The first few errors come from
Rubygems which tries to load optional libraries. The last one comes
from webgen which tries to load the cache file and fails because no
cache file exists.
> One the update of the tree has completed, the generation of the
> webpages starts:
> 
> Writing changed nodes...
>     /bg.gif
> Exception `Errno::EEXIST'' at
/opt/local/lib/ruby/1.8/fileutils.rb:243
> - File exists - /Users/lars/Sites/larsbaehren.com/release/website
> Exception `NoMethodError'' at 
> /opt/local/lib/ruby/gems/1.8/gems/webgen-0.5.14/lib/webgen/node.rb:218
> - undefined method `coerce'' for "Upcoming blog
entries":String
> Exception `ArgumentError'' at 
> /opt/local/lib/ruby/gems/1.8/gems/webgen-0.5.14/lib/webgen/tag/menu.rb:40
> - comparison of Webgen::Tag::Menu::MenuNode with
> Webgen::Tag::Menu::MenuNode failed
> Exception `Webgen::RenderError'' at 
>
/opt/local/lib/ruby/gems/1.8/gems/webgen-0.5.14/lib/webgen/sourcehandler.rb:170
> - comparison of Webgen::Tag::Menu::MenuNode with 
> Webgen::Tag::Menu::MenuNode failed
> Exception `Webgen::RenderError'' at 
>
/opt/local/lib/ruby/gems/1.8/gems/webgen-0.5.14/lib/webgen/sourcehandler.rb:78
> - comparison of Webgen::Tag::Menu::MenuNode with 
> Webgen::Tag::Menu::MenuNode failed
> An error has occurred:
>   Error while rendering </blog/2003.en.html>:
>     comparison of Webgen::Tag::Menu::MenuNode with 
> Webgen::Tag::Menu::MenuNode failed
> 
> I do get the suspicion that effects from the first error messages
> trickle down the line, but I am not quite sure what to look for
> exactly.
Hmm... this doesn''t really help me, too. Are you using any extensions
that might cause this?

It would definitely help if I could have a look at the source for your
website.

Best regards,
  Thomas

On Wednesday, August 8, 2012 12:08:01 PM UTC+2, Thomas Leitner wrote:

All the above errors can be ignored. The first few errors come
from
> Rubygems which tries to load optional libraries. The last one comes
> from webgen which tries to load the cache file and fails because no
> cache file exists.
>
Ok, I was just a bit confused here; keeping in mind what you just mentioned 
however I am wondering why these events are considered to be errors and not 
simple warnings - but this is not the main issue here. 
 
> Hmm... this doesn''t really help me, too. Are you using any
extensions
> that might cause this?
>
No extensions used - I have been trying to keep things simple (at least for 
the time being). I will have to do something about a) the tags and b) the 
images at some later point, but at the moment I am focusing on pulling in 
the bulk of the contents.
 
> It would definitely help if I could have a look at the source for your 
> website.
>
Will do. One option is to upload everything on Github, alternative is to 
create a tar-file with the main components (e.g. omitting the pictures).

Cheers,

Lars

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I am currently pushing the sources onto my Github account at 
https://github.com/lbaehren/Website; this might take a little while, since 
there are already quite a few files.

Cheers,

Lars

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On 2012-08-08 03:20 -0700 Lars B?hren wrote:
> 
> On Wednesday, August 8, 2012 12:08:01 PM UTC+2, Thomas Leitner wrote:
> 
> All the above errors can be ignored. The first few errors come from
> > Rubygems which tries to load optional libraries. The last one comes
> > from webgen which tries to load the cache file and fails because no
> > cache file exists.
> >
> Ok, I was just a bit confused here; keeping in mind what you just
> mentioned however I am wondering why these events are considered to
> be errors and not simple warnings - but this is not the main issue
> here. 
Exceptions of kind LoadError occur often because one just doesn''t know
if a given library exists or not. And it would be error-prone to do
something simliar to `require` just to find out if a library is on the
path. It''s easier to just require the file and catch the exception.

Also note that these exceptions are thrown but do not lead to the
application shutting down, which means that there is some code in place
to deal with these errors in an orderly manner.
> > It would definitely help if I could have a look at the source for
> > your website.
> >
> Will do. One option is to upload everything on Github, alternative is
> to create a tar-file with the main components (e.g. omitting the
> pictures).
I have found the problem! :-) webgen assumes that the title meta
information is a string but when setting the title at the top of a page
file it may get stored as a number when only digits are present due to
YAML (as in src/pages/blog/2004.page).

This is no problem in most cases but when sorting pages via their title
information, Ruby can''t compare an Integer to a String (therefore the
error message with the missing `coerce` method).

Two ways to solve the problem:

1. You ensure that you only have string titles by wrapping all title
   meta information values with quotation marks.

2. You add the following code to your ext/init.rb file:

class ::Webgen::Node

  def <=>(other)
    self_so = (@meta_info[''sort_info''] &&
@meta_info[''sort_info''].to_s) ||
@meta_info[''title''].to_s || ''''
    other_so = (other[''sort_info''] &&
other[''sort_info''].to_s) ||
other[''title''].to_s || ''''
    if self_so !~ /\D/ && other_so !~ /\D/
      self_so = self_so.to_i
      other_so = other_so.to_i
    end
    self_so <=> other_so
  end

end

After this change the website will be generated but there are some
(fixable) problems with resolving paths (which may be due to the
fact I did not use cmake as per your instructions to generate the
website).

Best regards,
  Thomas

On Wednesday, August 8, 2012 2:57:35 PM UTC+2, Thomas Leitner wrote:
 
> I have found the problem! :-) webgen assumes that the title meta
> information is a string but when setting the title at the top of a page
> file it may get stored as a number when only digits are present due to
> YAML (as in src/pages/blog/2004.page).
>
Thanks a bunch. Already fixed the meta information and everything (minus 
some warnings) is working once more.
 
> This is no problem in most cases but when sorting pages via their title
> information, Ruby can''t compare an Integer to a String (therefore
the
> error message with the missing `coerce` method).
>
Ok, I guess there is no internal conversion done, in order to enforce 
internal representation which can be compared.
 
> Two ways to solve the problem:
>
> 1. You ensure that you only have string titles by wrapping all title
>    meta information values with quotation marks.
>
> 2. You add the following code to your ext/init.rb file:
>
I''ll keep the second option in mind; for the time being the simplest 
solution is to follow option 1, by adjusting my scripts to generate correct 
metadata. 

Thanks again.

Cheers,

Lars

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