Add URLs to asmems4.bst

Question

I'm having a problem integrating asmems4.bst supplied by my department for my thesis. Several of my references are websites and asmems4.bst doesn't output URLs in my bibliography. From an answer to another question, I modified the .bst file as below, but with worse results. When I include format.url output into my code, the compiled PDF no longer shows the title field of the webpage, only the author and date fields and no contents of the url field.

(No format.url)

[6] Statista, 2019. Electricity prices for households in Spain from 2010 to 2018, semi-annually (in euro cents per kilowatt-hour).

vs.

(With format.url)

[6] Statista, 2019.

This is the function I added:

FUNCTION {format.url}
{ url duplicate$ empty$
    { pop$ "" }
    { "\url{" swap$ * "}" * 
      urldate duplicate$ empty$
        { pop$ }
        { " (Accessed: "  swap$ * ")" * * }
      if$
    }
  if$
}

Then I modified the function misc, which processes entries of type @misc:

FUNCTION {misc}
{ output.bibitem
  format.authors output
  author format.key output              % ASME puts year
  output.year.check                     % after author(s)
  title howpublished new.block.checkb
  format.title output
  howpublished new.block.checka
  howpublished output
  format.date output
  new.block
  note output
%I added this format line
  format.url output
  fin.entry
  empty.misc.check
}

Any suggestions?

UPDATE:

I found another question that was similar and have changed some things. I have been using Mendeley to auto-populate my refs.bib but apparently the access date doesn't make it through the synchronization from Mendeley to Overleaf. So, I have created a 2nd web.bib file for my website references.

In addition to that, I have included url and urldate in the ENTRY of asmems4.bst. Using the same format.url function as included above, I now have a large gap between the website reference and the next reference, but no url or accessed date. In the picture below, references [6] and [7] are both online references with large gaps following them whereas [5] and [8] are journal articles with half the space.

Answer 1

Aaron -- This continues my comment above, with code.

I added your FUNCTION {format.url} and your edit to the FUNCTION {misc} to my copy of amsems4.bst, using the following sample file:

\documentclass[11pt]{article}

\usepackage{hyperref}

\begin{document}

\nocite{*}
\bibliographystyle{asmems4}
\bibliography{asmejour-sample}

\end{document}  

The bibliography I have is a long list of entries, not at all set up for this particular .bst, but here are two examples:

@misc{mpl,
    title={mpl colormaps},
    author={St{\'e}fan {van der Walt} and Nathaniel Smith},
    URL = {http://bids.github.io/colormap/},
    urldate = {Aug. 26, 2018},
    year = 2015,
    organization = {GitHub},
    address = {San Francisco, CA},
    month = {September},
}

@misc{GSL,
    title    =  {{GNU} Scientific Library Release 2.4},
    URL = {https://www.gnu.org/software/gsl/},
   author = {Mark Galassi 
    and Jim Davies
    and James Theiler
    and Brian Gough
    and Gerard Jungman
    and Patrick Alken
    and Michael Booth
    and Fabrice Rossi
    and Rhys Ulerich},
   year = 2017,
   organization = {Free Software Foundation},
   address = {Boston, MA},
   urldate = {Dec. 12, 2018},
   month = {June},
}

and they come out like this:

Note that I have hyperref loaded so the hyperlinks are set, as indicated by the thin cyan boxes around the urls.

Hope this helps.

Answer 2

I never did figure out how to make the functions work, but I did find a solution that worked for me. Because Mendeley Online does not properly export web references, I had to create a new .bib file just for my web references. When I did that, I just added the URL and accessed date to howpublished={<url>~(Accessed on dd mo, yyyy)} and that did the trick.