I created ~/.mailcap and put the following line in it:
text/html; links2 -g %s; test=test -n "$DISPLAY"

I did not change my configuration and now I cannot reproduce the behaviour
however I try.

On Mon, 23 Nov 2020 at 22:29, Tomi Ollila <tomi.ollila@iki.fi> wrote:

> On Mon, Nov 23 2020, Wenlong Dai wrote:
>
> > I've been trying to use links2 to view html part of messages.
> > The problem I'm encountering is that, the part would be saved as
> > /tmp/xxx/xxx.shtml and
> > passed on to links2, and it seems links2 doesn't recognise the .shtml
> > extension.
> >
> > netsurf works well with .shtml though.
> >
> > But being stubborn as I am, I would like to know if I can make notmuch
> > output .html file instead?
> > I did a bit of research on shtml, seems it's completely unnecessary in
> this
> > case? why would notmuch choose this extension anyway?
>
> I could not find any reference to .shtml in notmuch emacs mua sources
> ... nor could I find such in the "message" sources
> (zgrep ... in /usr/share/emacs/{version}/lisp/gnus/*.gz)
> notmuch emacs mua is using doing many of the things.
>
> How did you configure emacs to use links2/netsurf to view html parts ?
>
> (/usr/share/emacs/{version}/lisp/gnus/mm-view.elc.gz defines these
> to be known and how those are executed:
>
> --8<----8<----8<----8<----8<----8<----8<----8<----8<----8<--
> (defvar mm-text-html-renderer-alist
>   '((shr . mm-shr)
>     (w3m . mm-inline-text-html-render-with-w3m)
>     (w3m-standalone . mm-inline-text-html-render-with-w3m-standalone)
>     (gnus-w3m . gnus-article-html)
>     (links mm-inline-render-with-file
>            mm-links-remove-leading-blank
>            "links" "-dump" file)
>     (lynx mm-inline-render-with-stdin nil
>           "lynx" "-dump" "-force_html" "-stdin" "-nolist")
>     (html2text mm-inline-render-with-function html2text))
>   "The attributes of renderer types for text/html.")
> -->8---->8---->8---->8---->8---->8---->8---->8---->8---->8--
>
> Tomi
>


-- 
Kind Regards,
Wenlong Dai