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    1/*  Part of SWI-Prolog
    2
    3    Author:        Jan Wielemaker
    4    E-mail:        J.Wielemaker@vu.nl
    5    WWW:           http://www.swi-prolog.org
    6    Copyright (c)  2002-2014, University of Amsterdam
    7                              VU University Amsterdam
    8    All rights reserved.
    9
   10    Redistribution and use in source and binary forms, with or without
   11    modification, are permitted provided that the following conditions
   12    are met:
   13
   14    1. Redistributions of source code must retain the above copyright
   15       notice, this list of conditions and the following disclaimer.
   16
   17    2. Redistributions in binary form must reproduce the above copyright
   18       notice, this list of conditions and the following disclaimer in
   19       the documentation and/or other materials provided with the
   20       distribution.
   21
   22    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   23    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   24    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   25    FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
   26    COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   27    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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   31    LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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   33    POSSIBILITY OF SUCH DAMAGE.
   34*/
   35
   36:- module(mimetype,
   37          [ file_mime_type/2            % +Path, -Type
   38          ]).

Determine mime-type for a file

Simple library to guess the mime-type from the extension of a file. As various applications need to do this type ofinferencing it seems worthwhile to place this functionality in an extensible library.

To be done
- Consider content handling (using the Unix file command)
- Allow parameters? (e.g. text/html; charset=UTF-8) */
 file_mime_type(+FileName, -MimeType) is semidet
True when MimeType is the mime-type to be used for sending FileName. The default rules can be overridden and extended using the hook mime_extension/2.
Arguments:
MimeType- is a compound term of the form Type/SubType.
   58file_mime_type(File, MimeType) :-
   59    file_name_extension(_, Ext, File),
   60    (   current_prolog_flag(windows, true)
   61    ->  downcase_atom(Ext, Lower),
   62        mime_extension(Lower, MimeType)
   63    ;   mime_extension(Ext, M0)
   64    ->  MimeType = M0
   65    ;   downcase_atom(Ext, Lower),
   66        mime_extension(Lower, MimeType)
   67    ),
   68    !.
   69file_mime_type(File, MimeType) :-
   70    file_base_name(File, Base),
   71    downcase_atom(Base, Lower),
   72    name_mimetype(Lower, Mime),
   73    !,
   74    MimeType = Mime.
   75file_mime_type(_, MimeType) :-
   76    default_mimetype(MimeType).
 mime:mime_extension(+Ext, -MimeType) is semidet
Hook that is called by file_mime_type/2 before the default table is examined.
   83:- multifile
   84    mime:mime_extension/2.   85
   86mime_extension(Ext, MimeType) :-
   87    (   mime:mime_extension(Ext, Mime)
   88    ->  MimeType = Mime
   89    ;   ext_mimetype(Ext, Mime)
   90    ->  MimeType = Mime
   91    ).
 default_mimetype(-MimeType) is semidet
If the mime-type cannot be determined from the file extension, this predicate is used as fallback. It takes the value from the Prolog flag default_mimetype. To change the default, use e.g.,
:- set_prolog_flag(default_mimetype, text/plain).

The initial default mime-type is application/unknown. Use the value - to denote there is no default.

  106:- create_prolog_flag(default_mimetype, application/unknown, []).  107
  108default_mimetype(MimeType) :-
  109    current_prolog_flag(default_mimetype, MimeType),
  110    MimeType = _/_.
 ext_mimetype(+Extension, -MimeType) is semidet
Built-in table of file-name extension to mime-type mappings.
To be done
- Update this list, e.g., from http://www.webmaster-toolkit.com/mime-types.shtml
  120                                        % plain text
  121ext_mimetype(txt,  text/plain).
  122                                        % markup
  123ext_mimetype(htm,  text/html).
  124ext_mimetype(html, text/html).
  125ext_mimetype(xhtml, application/'xhtml+xml').
  126ext_mimetype(sgml, text/'x-sgml').
  127ext_mimetype(sgm,  text/'x-sgml').
  128ext_mimetype(xml,  text/xml).
  129ext_mimetype(css,  text/css).
  130ext_mimetype(xsl,  text/xml).           % Unclear what this should be.
  131ext_mimetype(md,   text/'x-markdown').
  132                                        % semantic web stuff
  133ext_mimetype(rdf,  application/'rdf+xml').
  134ext_mimetype(rdfs, application/'rdf+xml').
  135ext_mimetype(owl,  application/'rdf+xml').
  136ext_mimetype(ttl,  application/turtle).
  137ext_mimetype(nt,   application/'n-triples').
  138ext_mimetype(nq,   application/'n-quads').
  139                                        % Prolog source
  140ext_mimetype(pl,   text/plain).
  141                                        % Other languages
  142ext_mimetype(c,    text/'x-c').
  143ext_mimetype(h,    text/'x-c').
  144ext_mimetype(cc,   text/'x-c').
  145ext_mimetype(py,   text/'x-python').
  146ext_mimetype(java, text/'x-java').
  147ext_mimetype(sh,   text/plain).
  148                                        % Packaged formats
  149ext_mimetype(gz,   application/'x-gzip').
  150ext_mimetype(zip,  application/zip).
  151ext_mimetype(tgz,  application/'x-gtar').
  152                                        % Some document formats
  153ext_mimetype(pdf,  application/pdf).
  154ext_mimetype(doc,  application/msword).
  155                                        % Java classes
  156ext_mimetype(class, application/'octet-stream').
  157ext_mimetype(jar,  application/'x-java-archive').
  158                                        % JavaScript
  159ext_mimetype(js,   text/javascript).
  160                                        % Visual Basic Script :-(
  161ext_mimetype(vbs,  text/vbscript).
  162                                        % Some image formats
  163ext_mimetype(jpg,  image/jpeg).
  164ext_mimetype(jpeg, image/jpeg).
  165ext_mimetype(gif,  image/gif).
  166ext_mimetype(png,  image/png).
  167ext_mimetype(tif,  image/tiff).
  168ext_mimetype(tiff, image/tiff).
  169ext_mimetype(xpm,  image/'x-xpixmap').
  170ext_mimetype(ico,  image/'x-ico').
  171ext_mimetype(svg,  image/'svg+xml').
  172                                        % Google earth
  173ext_mimetype(kml,  application/'vnd.google-earth.kml+xml').
  174ext_mimetype(kmz,  application/'vnd.google-earth.kmz').
  175
  176                                        % Flash
  177ext_mimetype(swf,  application/'x-shockwave-flash').
  178ext_mimetype(flv,  video/'x-flv').
  179                                        % MP3
  180ext_mimetype(mp3,  audio/mpeg).
  181                                        % Downloads
  182ext_mimetype(rpm,  application/'x-rpm').
  183ext_mimetype(exe,  application/'x-executable').
 name_mimetype(+DownCaseFileName, -MimeType) is semidet
Determine the mime-type of files based on the entire filename.
  189name_mimetype(makefile,       text/plain).
  190name_mimetype(configure,      text/plain).
  191name_mimetype('configure.in', text/plain).
  192name_mimetype('configure.ac', text/plain).
  193name_mimetype('makefile.in',  text/plain).
  194name_mimetype('makefile.am',  text/plain).
  195name_mimetype('readme.in',    text/plain)