Dear htdig developers,
I, as a site administrator, have got recently a problem. My problem source
is rather specific for my country, namely, it arises from the necessity to
recode various existing in Russian Web codepages into each others. The
commonly used webserver in Russia is the so called Russian Apache, which
performs recoding automatically and is very customizable. However, it would
be undesirable to recode htsearch output (it should be in the same encoding as
the search phrase entered), while the custom headers, footers and so on
(search_results_header, search_results_footer, ...) should still be recoded.
I have implemented the following solution, which might be useful not only
for Russian Apache users, but also for some other purposes. It is very
simple:
One can use variable substitution in htdig.conf in three forms: $var, $(var)
and ${var}.
If one uses $var or ${var} (the second form is used in the htdig examples),
he gets the former behaviour, as always before.
If one uses the $(var) form, then firstly the usual variable substitution
takes place, and then, if no variable found, the shell environment is looked
for such a variable via getenv().
I have used the modified $(var) form to make htsearch to take different
search_results... templates for different charsets requested by browser in the
following way:
search_results_footer: ${common_dir}/footer_$(CHARSET).html
Then, the Russian Apache webserver sets the CHARSET variable for CGI
scripts, among others. Depending upon its value, different footers can be
taken:
footer_koi8-r.html
footer_windows-1251.html
footer_translit.html
footer_ISO-8859-5.html
and so on...
The different footers can be produced from a single one via recoding tool.
However, they may also easily have totally different contents.
Such a feature does not break existing htdig configuration rules, i.e. it is
not dangerous. In the same time, it can be used to make the search outputs
yet more configurable. The webservers set a lot of variables which can be
used in a similar manner.
The very short patch to implement the shell variable substitution follows
(for the newest, 3.1.5 version, it is exactly the same):
diff -ru htdig-3.1.2.orig/htlib/ParsedString.cc htdig-3.1.2/htlib/ParsedString.cc
--- htdig-3.1.2.orig/htlib/ParsedString.cc Thu Apr 22 09:47:58 1999
+++ htdig-3.1.2/htlib/ParsedString.cc Wed Mar 1 09:55:27 2000
@@ -23,6 +23,7 @@
#include <fstream.h>
#include <ctype.h>
#include <stdio.h>
+#include <stdlib.h>
//*****************************************************************************
@@ -80,6 +81,7 @@
char *str = value.get();
char delim = ' ';
int need_delim = 0;
+ char *ev;
parsed = 0;
while (*str)
@@ -114,6 +116,12 @@
temp = (ParsedString *) dict[variable];
if (temp)
parsed << temp->get(dict);
+ else if (delim == ')')
+ {
+ ev = getenv (variable);
+ if (ev)
+ parsed << ev;
+ }
str++;
}
else if (need_delim)
With best wishes,
Georgy.
_______________________________________________________________________________
Georgy Salnikov
NMR Group
Novosibirsk Institute of Organic Chemistry
Lavrentjeva, 9, 630090 Novosibirsk, Russia
Tel. +7-3832-341960 +7-3832-331456
Fax +7-3832-331456
Email [EMAIL PROTECTED]
_______________________________________________________________________________
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