How to find a file's mailcap "content type"?

[Chris Green]

On Mon, Oct 28, 2019 at 10:20:06PM +0000, Peter Flynn wrote:
> On 28/10/2019 21:55, Chris Green wrote:
> > How can one find what mailcap "content type" corresponds to a file's
> > actual format?
> > 
> > Some are quite obvious as the default file type suffix matches the
> > seconds field of the mailcap content type, but this isn't always so.
> 
> You mean like application/pdf? That's not a reliable guide.
> 
> > For example there don't seem to be single, obvious entries for MS Word
> > .doc or .docx files.
> 
> My /etc/mailcap contains the two single entries:
> 
> >> grep '%s\.doc[x]*$' /etc/mailcap
> > > application/vnd.openxmlformats-officedocument.wordprocessingml.document; 
> soffice --nologo --writer '%s'; edit=soffice --nologo --writer '%s';test=test 
> -n "$DISPLAY"; description="Office Open XML Document";nametemplate=%s.docx 
> 
> > > application/msword; soffice --nologo --writer '%s'; edit=soffice --nologo 
> --writer '%s'; test=test -n "$DISPLAY"; description="Microsoft Word Document"; 
> nametemplate=%s.doc 
> 
So can one rely on the nametemplate field if there's not a match on
the second part of the content type?


> See RFC 6838 (Media Type Registration) January 2013, section 3.2 Vendor Tree
> for details of how commercial and industrial vendor-related products are
> registered using the "vnd." facet.
> 
> In the case of Microsoft Office Open XML (MS-Office) and OASIS OpenDocument
> XML (eg LibreOffice) file formats (and others) the picture is muddied by the
> fact that the file format is actually ZIP, but the documents are typically
> opened using application products.
> 
Yes, I know .docx is a compressed format but if I want to write a
custom handler for (for example) .docx what do I put in my local
~/.mailcap file?  Is something like:-

application/vnd.openxmlformats-officedocument.wordprocessingml.document myscript.sh %s

going to hand .docx files to myscript.sh?

(I already have custom scripts handling PDF and JPG files)


-- 
Chris Green