Unable to make sense of error output

[Thomas C. Cloyd]

I have tried for an hour to figure out the problem. I am completely stumped.

SOURCE FILE (vastly striped down, to find the error):
```

---

title: Notes

---

xxx

```
RESULTING CRASH FILE; https://pastebin.com/3zW2cAmS

QUESTION: Is it impossible simply to begin compile crash output with the name of the offending file, followed by the line and if possible the character that caused the problem? I desperately want this information but it seems never to be output. Is this impossible?

Thanks for your help...

t.

[Denis Defreyne]

Hey Tom,

The error message in the crash log, undefined method `render', suggests that the Rendering helper isn’t activated. In a file in lib/ (e.g. lib/helpers.rb) you’ll need

use_helper Nanoc::Helpers::Rendering

or

include Nanoc::Helpers::Rendering

The render method is provided by the Rendering helper. Let me know if that helps, and if it doesn’t, do share the contents of your default layout file as well.

As for your question: It would be possible to start the crash log with the name of the item that is being compiled (it’s currently further down, in the ITEM BEING COMPILED section) but I’ve found that to be not a useful place to start — most often, when compilation fails, the stack trace provides more useful information.

Best,

Denis Defreyne

[dəˈni] • pronouns: he/him

+49 (0) 1573 1969 173

he...@denisdefreyne.com

https://denisdefreyne.com

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[Thomas C. Cloyd]

Thank you for your thoughtful response. I am struggling to make use of
it. I should provide more context, perhaps. I am running nanoc using
bunde, inside a vscodium workspace, so that's where I'm looking right
now. Right now I am looking at
".../vendor/bundle/ruby/3.2.0/gems/nanoc-4.14.3/lib/nanoc/helpers/rendering.rb",
but what am I looking for? Am I even looking in the right place?

You refer to "a file in lib/ (e.g. lib/helpers.rb) " - I have NO idea
what file that might be. How do I identify it?

I just don't know enough to be very helpful to myself.

Looking for "ITEM BEING COMPILED" I see it 87 lines down in a 460 line
crash.log. It would be so helpful just to lead such output with the
name of the source file and the line (and if possible character count
location) of where the problem occurred. All that deep-dive ruby
output is of no use to people like me at all. I'm thinking that this
crash output doesn't have to be an either/or thing. It could still be
460 lines of stuff you can use and one line that I could use. Maybe
that's not possible. You alone know!

I am not having this problem with any of my other vscodium workspaces
where I'm using nanoc.

Thanks again for your help.

Tom

In this instance that might not have helped me, but 99% of the time it
would, in my experience. It's the only information I can really use.

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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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System Version: galp5
[updated 2025-02-01]

[Denis Defreyne]

On 2025-11-27 at 06:20, Thomas C. Cloyd wrote:
> Thank you for your thoughtful response. I am struggling to make use of
> it. I should provide more context, perhaps. I am running nanoc using
> bunde, inside a vscodium workspace, so that's where I'm looking right
> now. Right now I am looking at
> ".../vendor/bundle/ruby/3.2.0/gems/nanoc-4.14.3/lib/nanoc/helpers/rendering.rb",
> but what am I looking for? Am I even looking in the right place?
>
> You refer to "a file in lib/ (e.g. lib/helpers.rb) " - I have NO idea
> what file that might be. How do I identify it?

I’m specifically referencing the lib/ directory that sits in your site, next to the content/, layouts/ and output/ directories.

Nanoc will automatically load all files in that lib/ directory (see https://nanoc.app/doc/helpers/) and so it doesn’t precisely matter which file in lib/ precisely contains `use_helper Nanoc::Helpers::Rendering`, as long as there a file that contains that.

Here’s what it looks like in the Nanoc web site source code itself: https://github.com/nanoc/nanoc.app/blob/main/lib/helpers_.rb

Hope this helps,

> https://groups.google.com/d/msgid/nanoc/CAM2QCXaZ4vjnkQ0kYU-bEmcjaXigxohqB8cV-0OoPFgXCaMS%3Dw%40mail.gmail.com.

[Denis Defreyne]

Following up on this:

> Looking for "ITEM BEING COMPILED" I see it 87 lines down in a 460 line
> crash.log. It would be so helpful just to lead such output with the
> name of the source file and the line (and if possible character count
> location) of where the problem occurred. All that deep-dive ruby
> output is of no use to people like me at all. I'm thinking that this
> crash output doesn't have to be an either/or thing. It could still be
> 460 lines of stuff you can use and one line that I could use. Maybe
> that's not possible. You alone know!

I looked into this and it turns out to be a regression: Nanoc used to print the item right after the one-line error message. I’ve improved the crash log for the upcoming Nanoc release (https://github.com/nanoc/nanoc/commit/1d8c1d740b78b3862ba300702aa205398207f3fa), where the Ruby stack trace will be printed after the item that is being compiled.

Best,

Denis Defreyne
[dəˈni] • pronouns: he/him

+49 (0) 1573 1969 173
he...@denisdefreyne.com
https://denisdefreyne.com

> https://groups.google.com/d/msgid/nanoc/8c42141e-4a51-45aa-b725-3ae5fbcb89cb%40app.fastmail.com.