# Recent Posts

409 posts found

Forum: Instiki – Topic: nlab

Just noticed that you got hit by the same spammer. I think that instiki.org also got hit, but then it’s hard to tell with that site anymore.

Seems as though this spammer has gone for every instiki installation under the sun!

Forum: Instiki – Topic: nlab

The azimuth project just got a massive spam hit, 317 pages in total. To deal with that, I ended up working on the database level. What I did was to try to simulate “rollbacks”: copy the data from the last decent copy and paste it as a new row in the “revisions” table. That seemed the safest approach.

But it did get me thinking about the database and specifically the “revisions” table. Two questions:

1. If I simply remove a row from the revisions table, does instiki get confused?
2. If the timestamps are a bit out of order, does instiki get confused? Or is the revision id the One True Order on the revisions table?

Forum: Instiki – Topic: nlab

Okay, I’ll take a look at that. Is it obvious which file to add it to, or should I create a new file and add it to the page template?

Forum: Instiki – Topic: nlab

Sorry. There isn’t a way to localize the Javascript.

You could, however, add some site-wide Javascript, which attaches an event listener to some element(s), based on the request-URL.

Forum: Instiki – Topic: nlab

This isn’t nLab-specific, but it’s neither a bug nor a feature requestion: more of a “How do I?”.

There’s an effect that I’d like to put on a page (or a family of pages). It’s achievable in CSS using some fancy pseudo-classes, but some browsers don’t support it (notably mobile browsers) so I was pondering a javascript solution. Essentially, it would just modify some CSS properties of certain elements (selected by class) when a link was clicked upon.

The details aren’t particularly important. What I want to know is whether or not there is an easy way to add a bit of javascript to a page. I suppose it could be added to all pages, but then it would be better if it were only all pages in a particular web. Something a bit like the stylesheet tweaks, but for javascript.

Forum: itex2MML – Topic: Bugs

Forum: Instiki – Topic: Bugs

On another topic, is there any progress on cache bugs?

I’ll take a look, again, at file uploads.

For the other, you have not been able to present me with a set of steps to reproduce the bug. So there’s nothing that I can do.

Forum: itex2MML – Topic: Bugs

The optional argument syntax for extensible arrows doesn’t swallow spaces correctly. If I type \xrightarrow [a]{b} then in LaTeX, this is equivalent to \xrightarrow[a]{b} because spaces are automatically swallowed after commands. However, in iTeX then they are not equivalent:

$\stackrel{\left[}{\to }a\right]b\underset{a}{\overset{b}{\to }}$\xrightarrow [a]{b} \xrightarrow[a]{b}

Forum: Instiki – Topic: Bugs

Thanks! That’s great.

On another topic, is there any progress on cache bugs? With the file uploading, then it doesn’t work at all. When I upload a file to a page then that page doesn’t get expired. We’re also seeing it with renaming pages on the nLab. We’re trying to keep a record of it in case it’s of use to you: http://www.math.ntnu.no/~stacey/Mathforge/nForum/comments.php?DiscussionID=3168

Forum: Instiki – Topic: Bugs

D’oh!

Forum: Instiki – Topic: Bugs

I just updated my course installation to the latest one, did the ruby bundle and touch tmp/restart.txt as well. Then I tried to edit the stylesheet and kept getting Internal Application Error. Here’s what the log said:

RuntimeError (Instiki could not create directory to store uploaded files. Please
make sure that Instiki is allowed to create directory /home/stacey/current/others/instiki/webs/
mathsnotes/files/0 and add files to it.):
app/models/web.rb:169:in rescue in create_files_directory'
app/models/web.rb:161:in create_files_directory'
app/models/wiki.rb:32:in edit_web'
app/controllers/admin_controller.rb:59:in edit_web'

There’s no reason why Instiki can’t create that directory, but I’m a bit at a loss as to why it is trying to do so.

I restarted the web server and got the same error.

Forum: Heterotic Beast – Topic: Rails 3.1.0

Now on Rails 3.1.1.

Forum: Instiki – Topic: Bugs

This one’s possibly the most obscure yet!

Not terribly obscure at all. But it does highlight how overloaded the WikiLink mechanism is. Ugly as sin!

This is probably not the right fix. But it’s a fix.

Forum: Instiki – Topic: Bugs

New one for you. This one’s possibly the most obscure yet!

The wiki doesn’t like ampersands in file names; that is, in the [[file|filename :file]] syntax (or whatever the right syntax is). This feels a bit like a “my head hurts when I hit it with a hammer” bug! Obviously, no sane person would put an ampersand in a file name. I did so by accident and it threw “Internal application error” in my face. It was only by looking at the logs that I realised what I’d done. The logs have:

ActionController::RoutingError (No route matches {:controller=>"file", :web=>"mathsnotes",
:action=>"file", :id=>"lecture.annotations.2011-10-0&.pdf"}):
lib/url_generator.rb:83:in file_link'
lib/url_generator.rb:43:in make_link'

(and a whole load more “in XYZ”s - I presume that the whole trace isn’t necessary)

Forum: Instiki – Topic: Bugs

Forum: Instiki – Topic: nlab

I suppose there is a marginally higher probability that a ‘merge’ will succeed with some lines commented-out, instead of deleted.

But I expect that it’s a small effect; hardly worth obsessing-over.

Forum: Instiki – Topic: Bugs

This is probably related to that last one. Is the black square inserted at the end of a proof also done by javascript? If so, that might be worth thinking about whether or not it makes the same assumption. In particular, if a proof ends with a bit of displayed maths then the square gets inserted into the containing div which is centred. This looks a little odd.

Forum: Instiki – Topic: nlab

Back on the CSS thing. I’m going to experiment with taking it out on my course wiki (safer than on the nLab). Since it’s in the main instiki file I guess I have to take it out system-wide (though I could put it back on a per-web basis, I guess). What’s the safest way to do that given that this is a file in the VCS? Should I comment out the line, or delete it?

(I want to avoid - as much as possible - breaking things when I do a bzr pull)

Forum: Instiki – Topic: Bugs

Ah. I see.

Forum: Instiki – Topic: Bugs

What are you using to show the source? My default is Firebug, though I also use the “View Source Chart” addon. Here’s what Firebug says it sees:

<div id="thmA" class="num_theorem">
<p>
<span class="theorem_label">Theorem</span>
<span>. </span>
Correct behaviour
</p>
</div>
<div id="thmB" class="num_theorem">
<ol>
<span class="theorem_label">Theorem</span>
<span>. </span>
<li>A list, with</li>
<li>Incorrect behaviour</li>
</ol>
</div>
<div id="thmC" class="num_theorem">
<div style="float: right;">
<span class="theorem_label">Theorem</span>
<span>. </span>
<p>A comment to one side</p>
</div>
<p>The theorem</p>
</div>

In particular, note that the second theorem label is a child of the <ol> element.

If I just do the naive “View Source” then this is what I see:

<div class='num_theorem' id='thmA'>
<h6 id='theorem_1'>Theorem</h6>

<p>Correct behaviour</p>
</div>

<div class='num_theorem' id='thmB'>
<h6 id='theorem_2'>Theorem</h6>

<ol>
<li>A list, with</li>

<li>Incorrect behaviour</li>
</ol>
</div>

<div class='num_theorem' id='thmC'>
<h6 id='theorem_3'>Theorem</h6>

<div style='float: right;'>
<p>A comment to one side</p>

</div>

<p>The theorem</p>
</div>

So you’re right and wrong. What I’m seeing on the page is not an artefact of Maruku. Since the source sent by Instiki is correct, my guess is that it is Javascript that is converting the <h6> to a <span> and is inserting it as a child of the first element. (In my opinion, it should do so only if that first element is a <p>, otherwise it should be in a block element all of its own.)

Forum: Instiki – Topic: Bugs

Sorry.

Maruku’s HTML output looks perfectly OK (ie, as expected) in your example(s). (View the XHTML source, and tell me what you think is wrong with it.)

What you are complaining about is that the CSS doesn’t produce the desired appearance of the output.

Since you’ve been mucking about with the CSS of the Theorem Environment, why don’t you muck about some more and get it to format your example correctly.

Forum: Instiki – Topic: Bugs

Here’s a maruku bug; I guess I’m noting it as much for when (if!) you change engines as for hoping that it’ll get fixed now.

In a theorem or proof environment, the conversion of the h6 element to a label doesn’t always work correctly if the following element is a block-level one (list or a div, for example).

I’ve been trying to post an example here, but failing miserably. Even the correct syntax doesn’t seem to be working. So I’ve stuck an example at the top of the Sandbox in the nLab:

http://ncatlab.org/nlab/show/Sandbox

(I originally noticed this on my course wiki.)

Forum: Instiki – Topic: Bugs

I was on 759. I’ll upgrade today.

I was also probably doing something more complicated than I described, only I can’t remember all the steps, since I was moving content from one page to another and renaming them. I thought I’d described the important ones, but there may have been something that I’d missed.

I’ll try to be more observant of my own behaviour in case it occurs again!

Forum: Instiki – Topic: Bugs

Are you using the current revision of Instiki? ‘Cuz that’s not the behaviour I see, when I follow the steps above.

Forum: Instiki – Topic: Bugs

Looking at the log, what I see is the following:

Processing WikiController#save (for 2001:700:300:1470:862b:2bff:fe9b:c741 at 2011-09-21 14:32:27) [POST]
"alter_title"=>"1", "new_name"=>"norm for continuous functions on the interval", "author"=>"Andrew Stacey",
"web"=>"mathsnotes", "id"=>"continuous functions on the interval"}
Reading page 'continuous functions on the interval' from web 'mathsnotes'
Page 'continuous functions on the interval'  found
2001:700:300:1470:862b:2bff:fe9b:c741
Reading page 'continuous functions on the interval' from web 'mathsnotes'
Page 'continuous functions on the interval'  found
Maruku took 0.002904876 seconds.
Maruku took 0.002353689 seconds.
Maruku took 0.310123551 seconds.
Maruku took 0.301577887 seconds.

At that point, I get lots of Expired fragments, all of which refer to the new page name (or to lists). Then at the end, I see:

Redirected to http://mathsnotes.math.ntnu.no/mathsnotes/show/norm+for+continuous+functions+on+the+interval
Completed in 789ms (DB: 18) | 302 Found [http://mathsnotes.math.ntnu.no/mathsnotes/save/continuous+functions
+on+the+interval]

Seconds later, I go back to the tab with the original page in it and click “reload” to get:

Processing WikiController#show (for 2001:700:300:1470:862b:2bff:fe9b:c741 at 201
1-09-21 14:32:39) [GET]
Parameters: {"web"=>"mathsnotes", "id"=>"continuous functions on the interval"}
Reading page 'continuous functions on the interval' from web 'mathsnotes'
Cached fragment hit: views/mathsnotes/show/continuous+functions+on+the+interval (0.1ms)
Filter chain halted as [#<ActionController::Filters::AroundFilter:0x00000003585248
@kind=:filter, @method=#<Proc:0x00000003585680@/home/stacey/current/others/instiki/vendor/rails/actionpack/
lib/action_controller/caching/actions.rb:64>, @identifier=nil, @options={:only=>#<Set: {"show", "published",
"authors", "tex", "s5", "print", "recently_revised", "list", "file_list", "source", "history", "revision",
instiki/app/controllers/wiki_controller.rb:13>, :unless=>nil}>] did_not_yield.
Completed in 3ms (View: 0, DB: 1) | 200 OK [http://mathsnotes.math.ntnu.no/mathsnotes/show/
continuous+functions+on+the+interval]

In other words, the cached version is there.

(Edit: “A load of content” is a substantial amount.)

Forum: itex2MML – Topic: Bugs

Once again: thank you very much!

Forum: Instiki – Topic: Bugs

I’m not so sure I understand.

1. I created a page, “Foo”.
2. I edited the page, “Foo”, and changed the name to “Bar”.
3. I removed the [[!redirects Foo]] directive, and saved the page.

All instances of “Foo” were successfully removed from the Cache.

What am I missing?

Forum: itex2MML – Topic: Bugs

It’s a matter of the precedence rules that you expect not being respected by itex2MML

 \lim_{n\to 0}

is set with an <munder>. But, when you type

\displaystyle \lim_{n\to 0}

the precedence of the ”_” is not treated as being higher. The above is treated as equivalent to

{ \displaystyle \lim }_{n\to 0}

which is set with an <msub>. Putting in the grouping explicitly:

\displaystyle { \lim_{n\to 0} }

gives you what you were expecting.

I think this is confusing. Probably, you were expecting \displaystyle to behave more like \color{red} does (compare the definitions of COLOR and of DISPLAY, respectively, in itex2MML.y).

### Update:

Let’s see: $\underset{n\to 0}{\mathrm{lim}}\frac{1}{n}=0$

${\mathrm{lim}}_{n\to 0}\frac{1}{n}=0$\textstyle \lim_{n\to 0} \frac{1}{n} = 0

Yup. itex2MML 1.4.8 works as you’d expect.

Forum: Instiki – Topic: Bugs

Talking about cache bugs (nlab thread), I think I just came up against another incarnation of The Dreaded Cache Bug of Bexhill on Sea. I was reorganising pages on my course wiki. I had a page that used to be a single page and now I wanted to split it into several. The stuff on that page was to go on one of the sub-pages, so I renamed that page. But I wanted to use the original page name as the main page. So I removed the automatically inserted redirect. Then I saved the page. The original page was still in the cache. As I wanted to create that page anyway, I manually entered the “new/page name” URL and that worked (“edit/page name” did not).

Forum: itex2MML – Topic: Feature Requests

Here’s an anti-feature request. itex2MML should never implement \newcommand (or any of its variants). Here’s my reasoning:


2. It would make it harder to truly collaborate. Every page with more than one editor is going to require reading the preamble just to find out what the local conventions are and that’s going to make it harder to edit something that someone else started.