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yap-6.3/packages/http/http_dirindex.pl

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2010-06-23 11:52:34 +01:00
/* Part of SWI-Prolog
Author: Jan Wielemaker
E-mail: J.Wielemaker@cs.vu.nl
WWW: http://www.swi-prolog.org
Copyright (C): 2009, VU University Amsterdam
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
As a special exception, if you link this library with other files,
compiled with a Free Software compiler, to produce an executable, this
library does not by itself cause the resulting executable to be covered
by the GNU General Public License. This exception does not however
invalidate any other reasons why the executable file might be covered by
the GNU General Public License.
*/
:- module(http_dirindex,
[ http_reply_dirindex/3 % +PhysicalDir, +Options, +Request
]).
:- use_module(library(http/html_write)).
:- use_module(library(http/http_path)).
:- use_module(library(http/http_dispatch)).
:- use_module(library(http/http_server_files)).
:- use_module(library(http/html_head)).
:- use_module(library(apply)).
:- use_module(library(option)).
/** <module> HTTP directory listings
This module provides a simple API to generate an index for a physical
directory. The index can be customised by overruling the dirindex.css
CSS file and by defining additional rules for icons using the hook
http:file_extension_icon/2.
@tbd Provide more options (sorting, selecting columns, hiding files)
*/
%% http_reply_dirindex(+DirSpec, +Options, +Request) is det.
%
% Provide a directory listing for Request, assuming it is an index
% for the physical directrory Dir. If the request-path does not
% end with /, first return a moved (301 Moved Permanently) reply.
%
% The calling conventions allows for direct calling from
% http_handler/3.
http_reply_dirindex(DirSpec, Options, Request) :-
http_safe_file(DirSpec, Options),
absolute_file_name(DirSpec, Dir,
[ file_type(directory),
access(read)
]),
memberchk(path(Path), Request),
( atom_concat(PlainPath, /, Path),
merge_options(Options,
[ title(['Index of ', PlainPath]) ],
Options1)
-> dir_index(Dir, Options1)
; atom_concat(Path, /, NewLocation),
throw(http_reply(moved(NewLocation)))
).
dir_index(Dir, Options) :-
directory_members(Dir, SubDirs, Files),
option(title(Title), Options, Dir),
reply_html_page(title(Title),
[ \html_requires(http_dirindex),
h1(Title),
table(class(dirindex),
[ \dirindex_title,
\back
| \dirmembers(SubDirs, Files)
])
]).
directory_members(Dir, Dirs, Files) :-
atom_concat(Dir, '/*', Pattern),
expand_file_name(Pattern, Matches),
partition(exists_directory, Matches, Dirs, Files).
dirindex_title -->
html(tr(class(dirindex_header),
[ th(class(icon), ''),
th(class(name), 'Name'),
th(class(modified), 'Last modified'),
th(class(size), 'Size')
])).
back -->
html(tr([ \icon_cell('back.png', '[UP]'),
\name_cell(.., 'Up'),
td(class(modified), -),
td(class(size), -)
])).
dirmembers(Dirs, Files) -->
dir_rows(Dirs, odd, End),
file_rows(Files, End, _).
dir_rows([], OE, OE) --> [].
dir_rows([H|T], OE0, OE) -->
dir_row(H, OE0),
{ oe(OE0, OE1) },
dir_rows(T, OE1, OE).
file_rows([], OE, OE) --> [].
file_rows([H|T], OE0, OE) -->
file_row(H, OE0),
{oe(OE0, OE1)},
file_rows(T, OE1, OE).
oe(odd, even).
oe(even, odd).
dir_row(Dir, OE) -->
{ file_base_name(Dir, Name)
},
html(tr(class(OE),
[ \icon_cell('folder.png', '[DIR]'),
\name_cell(Name, Name),
\modified_cell(Dir),
td(class(size), -)
])).
file_row(File, OE) -->
{ file_base_name(File, Name),
file_name_extension(_, Ext, Name),
file_type_icon(Ext, IconName)
},
html(tr(class(OE),
[ \icon_cell(IconName, '[FILE]'),
\name_cell(Name, Name),
\modified_cell(File),
td(class(size), \size(File))
])).
icon_cell(IconName, Alt) -->
{ http_absolute_location(icons(IconName), Icon, [])
},
html(td(class(icon), img([src(Icon), alt(Alt)]))).
name_cell(Ref, Name) -->
html(td(class(name), a(href(Ref), Name))).
modified_cell(Name) -->
{ time_file(Name, Stamp),
format_time(string(Date), '%+', Stamp)
},
html(td(class(modified), Date)).
size(Name) -->
{ size_file(Name, Size)
},
html('~D'-[Size]).
%% file_type_icon(+Extension, -Icon) is det.
%
% Determine the icon that is used to show a file of the given
% extension. This predicate can be hooked using the multifile
% http:file_extension_icon/2 hook with the same signature. Icon is
% the plain name of an image file that appears in the
% file-search-path =icons=.
file_type_icon(Ext, Icon) :-
http:file_extension_icon(Ext, Icon), !.
file_type_icon(_, 'generic.png').
:- multifile
http:file_extension_icon/2.
http:file_extension_icon(pdf, 'layout.png').
http:file_extension_icon(c, 'c.png').
http:file_extension_icon(gz, 'compressed.png').
http:file_extension_icon(tgz, 'compressed.png').
http:file_extension_icon(zip, 'compressed.png').
/*******************************
* RESOURCES *
*******************************/
:- html_resource(http_dirindex,
[ virtual(true),
requires([ css('dirindex.css')
])
]).