1: # The LearningOnline Network with CAPA
2: #
3: # $Id: lonhelp.pm,v 1.44 2014/04/23 17:57:57 bisitz Exp $
4: #
5: # .tex help system web server handler
6: #
7: # Copyright Michigan State University Board of Trustees
8: #
9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
10: #
11: # LON-CAPA is free software; you can redistribute it and/or modify
12: # it under the terms of the GNU General Public License as published by
13: # the Free Software Foundation; either version 2 of the License, or
14: # (at your option) any later version.
15: #
16: # LON-CAPA is distributed in the hope that it will be useful,
17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19: # GNU General Public License for more details.
20: #
21: # You should have received a copy of the GNU General Public License
22: # along with LON-CAPA; if not, write to the Free Software
23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24: #
25: # /home/httpd/html/adm/gpl.txt
26: #
27: # http://www.lon-capa.org/
28: #
29: # .tex file help handler
30:
31:
32: package Apache::lonhelp;
33:
34: use strict;
35: use Apache::Constants qw(:common :http);
36: use Apache::File();
37: use Apache::loncommon();
38: use Apache::lonacc();
39: use Apache::lontexconvert();
40: use Apache::lonnavmaps; # for advancedUser
41: use Apache::lonlocal;
42: use Apache::lonnet;
43: use tth();
44: use GDBM_File();
45: use lib '/home/httpd/lib/perl/';
46: use LONCAPA;
47:
48:
49: # This sub takes the name of a label in, and converts it to something
50: # that is a valid anchor name.
51:
52: sub processLabelName {
53: my ($name) = @_;
54: $name =~ tr/a-zA-Z0-9/_/cs;
55: return $name;
56: }
57:
58: # Serve out the text
59: sub servetext {
60: my ($r,$uri,$text,$is_mobile,$firstfile) = @_;
61: my $bugs;
62: my %helpconfig = &Apache::lonnet::get_dom('configuration',['helpsettings'],
63: $env{'request.role.domain'});
64: if (ref($helpconfig{'helpsettings'}) eq 'HASH') {
65: if ($helpconfig{'helpsettings'}{'submitbugs'} eq '1') {
66: $bugs = &Apache::loncommon::help_open_bug('Documentation',&mt('Report a documentation bug'));
67: }
68: }
69: my %lt = &Apache::lonlocal::texthash(
70: header => 'LON-CAPA Help',
71: search => 'Search LON-CAPA help',
72: query => 'Search',
73: );
74: $r->print(<<HEADER);
75: <h3 style="font: sans-serif"><img align="right" alt="help logo"
76: src="/adm/help/gif/lonhelpheader.gif" />$lt{'header'}</h3><hr />
77: <!-- BEGIN -->
78: HEADER
79: if ($is_mobile) {
80: my $width = 500;
81: my $height = 400;
82: my $machine = &Apache::lonnet::absolute_url();
83: $r->print(&Apache::loncommon::nicescroll_javascript('helpwrapper',
84: {cursorcolor => '#00F',
85: railalign => 'right',
86: railoffset => '{top:5,left:40}'},
87: undef,1,$machine.$firstfile));
88: $r->print('<div id="helpwrapper" style="height:'.$height.'px; width:'.$width.'px; overflow: auto;">'.
89: $text.
90: '</div>');
91: } else {
92: $r->print($text);
93: }
94:
95: if (&Apache::lonnavmaps::advancedUser()) {
96: $r->print(<<FOOTER);
97: <hr /><div class="LC_left_float">
98: <form action="$uri" method="post">
99: <fieldset><legend>$lt{'search'}</legend>
100: <input type="text" name="searchterm" size="40" />
101: <input type="submit" value="$lt{'query'}" />
102: </fieldset>
103: </form>
104: </div>
105: <div class="LC_left_float">
106: </div>
107: <div style="padding:0;clear:both;margin:0;border:0"></div>
108: $bugs
109: FOOTER
110: }
111:
112: $r->print(<<ENDBODY);
113: <!-- END -->
114: ENDBODY
115:
116: }
117:
118: # Render takes a tex fragment, transforms it for TtH, and returns the
119: # HTML equivalent
120: sub render {
121: my ($tex, $docroot) = @_;
122: tie (my %fragmentLabels, 'GDBM_File', $docroot . '/adm/help/fragmentLabels.gdbm', 0, 0);
123:
124: # This tells TtH what to do with captions, labels, and other
125: # things
126: $tex = "\\documentclass{article}\n" . $tex;
127:
128: # We process these ourselves because TtH can't handle then without
129: # LaTeX .aux files
130: # absolute paths for use with help.loncapa.org
131: $tex =~ s| \\ref\{([^}]*)\}
132: |
133: my $label=$1;
134: my $icon='/adm/help/help.png';
135: my $ext;
136: if ($1!~/\.hlp$/) {
137: if (($1 =~ /^\w+\.manual\.pdf$/) && (-e $docroot.'/adm/help/'.$1)) {
138: $icon = '/adm/lonIcons/pdf.gif';
139: } elsif ((!exists($fragmentLabels{$1})) && ($1!~/\.hlp$/)) {
140: &Apache::lonnet::logthis("ERROR: $1 not a valid help label");
141: $label='Error';
142: } else {
143: $label=substr($fragmentLabels{$1}, 0, -4);
144: $ext = '.hlp#' . &processLabelName($1);
145: }
146: } else {
147: $label=~s/\.hlp$//;
148: $ext = '.hlp#' . &processLabelName($1);
149: }
150: '\\begin{html}<a href="/adm/help/'.
151: $label .
152: $ext .
153: '"><img src="'.$icon.'" border="0" alt="'.&mt('Help').'" /></a>' .
154: '\\end{html}'
155: |gxe;
156:
157: # Backslashes
158: $tex =~ s|\\textbackslash|###BACKSLASH###|g;
159:
160: # Figures leftover without captions
161: $tex =~ s| \\includegraphics(\[[^]]*\])*\{([^}]*)\}
162: | '\\begin{html}<img src="/adm/help/gif/' . $2 . '.gif" border="2"'.
163: ' bordercolor="#000000"/>\\end{html}'
164: |gxe;
165:
166:
167: $tex=&Apache::lontexconvert::tth_converted(\$tex);
168:
169: # Finish backslashes
170: $tex =~ s/###BACKSLASH###/'\\'/ge;
171:
172: # Fix the pretty quotes
173: $tex =~ s/('')|(``)/"/g; #" to get emacs syntax highlighter happy
174:
175: # For some reason all captions come out as "Figure 0:", so
176: # just duck the issue...
177:
178: $tex =~ s/Figure 0://g;
179: $tex.=$Apache::lontexconvert::errorstring;
180: untie %fragmentLabels;
181:
182: return $tex;
183: }
184:
185: sub listmatches {
186: my ($docroot,$term,$subdir) =@_;
187: unless ($subdir) { $subdir=''; }
188: my $output='';
189: opendir(DIR,$docroot.'/adm/help/tex/'.$subdir);
190: foreach my $filename (sort readdir(DIR)) {
191: if ($filename=~/\.tex$/) {
192: open(FH,$docroot.'/adm/help/tex/'.$subdir.$filename);
193: my $quote='';
194: while (my $line=<FH>) {
195: if ($line=~/\Q$term\E/i) {
196: $line=~s/\\\w+//gs;
197: $line=~s/\{//gs;
198: $line=~s/\}//gs;
199: $line=~s/\\/ /gs;
200: $line=~s/\</\<\;/gs;
201: $line=~s/\>/\>\;/gs;
202: $line=~s/(\Q$term\E)/\<b\>$1\<\/b\>/gsi;
203: $quote.='<br />...'.$line.'...';
204: }
205: }
206: close(FH);
207: if ($quote) {
208: my $title=$filename;
209: $title=~s/\_/ /gs;
210: $title=~s/\.tex$//;
211: $filename=~s/\.tex$/\.hlp/;
212: $output.='<li><a href="/adm/help/tex/'.$subdir.$filename.'">'.$title.'</a>'.$quote.'</li>';
213: }
214: }
215: }
216: closedir(DIR);
217: return (($output?'<ul>'.$output.'</ul>':&mt('"[_1]" not found',$term)),$output);
218: }
219:
220: sub handler {
221: my $r = shift;
222:
223: my $docroot = $r->dir_config('lonDocRoot');
224:
225: &Apache::lonlocal::get_language_handle($r);
226: &Apache::loncommon::content_type($r,"text/html");
227: my $caller;
228: if ($env{'form.searchterm'}=~/\w/) {
229: $caller = 'search';
230: }
231:
232: my $starthash;
233:
234: if ($env{'browser.mobile'}) {
235: $starthash = {
236: only_body => 1,
237: add_entries => {
238: 'onload' => "javascript:expand_div('$caller');",
239: },
240: };
241: } else {
242: $starthash = {
243: only_body => 1,
244: };
245: }
246: my $firstfile;
247: my $start_page=
248: &Apache::loncommon::start_page('LON-CAPA Help',undef,$starthash);
249: my $text='';
250: my $uri = $r->uri;
251: if ($env{'form.searchterm'}=~/\w/) {
252: ($text,my $matches)=&listmatches($docroot,$env{'form.searchterm'},&Apache::lonlocal::current_language().'/');
253: if ($matches) {
254: my ($englishresult,$englishmatches)=&listmatches($docroot,$env{'form.searchterm'});
255: if ($englishmatches) {
256: $text.='<hr />'.$englishresult;
257: }
258: } else {
259: $text=&listmatches($docroot,$env{'form.searchterm'});
260: }
261: } else {
262: my $filenames = &unescape(substr($uri,rindex($uri,'/')+1,-4));
263:
264: # Security check on the file; the whole filename must consist
265: # of nothing but alphanums, ' ,, or ., or the file
266: # will be "not found", no matter what.
267:
268: return HTTP_NOT_FOUND if ($filenames !~ /\A[-0-9a-zA-z_'',:.]+\Z/);
269:
270: # Join together the tex files, return HTTP_NOT_FOUND if any of
271: # them are not found
272: my $tex = '';
273: # Since in insertlist.tab I want to specify multiple files,
274: # and insertlist.tab also uses commas, I need something else
275: # so replace : with ,
276: $filenames =~ s/:/,/g;
277: my @files = split(/,/, $filenames);
278: $firstfile = '/adm/help/'.$files[0].'.hlp';
279:
280: for my $filename (@files) {
281: if (-e $docroot.'/adm/help/tex/'.
282: &Apache::lonlocal::current_language().'/'.
283: $filename.'.tex') {
284: $filename=&Apache::lonlocal::current_language().'/'.$filename;
285: }
286: (my $file = Apache::File->new($docroot
287: . '/adm/help/tex/'.$filename.'.tex'))
288: or return HTTP_NOT_FOUND;
289: $tex .= join('', <$file>);
290: }
291:
292: $text = &render($tex, $docroot);
293: }
294:
295: $r->send_http_header;
296: $r->print($start_page);
297: &servetext($r,$uri,$text,$env{'browser.mobile'},$firstfile);
298: $r->print(&Apache::loncommon::end_page());
299:
300: return OK;
301: }
302:
303: 1;
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