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+#!/usr/bin/perl
+#
+# Copyright (c) 2005 Mathieu Roy <yeupou--gnu.org>
+# http://yeupou.coleumes.org
+#
+# 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 program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+# USA
+#
+# $Id: keduca-shrinker.pl,v 1.3 2005/04/23 11:30:50 yeupou Exp $
+
+use Getopt::Long;
+
+my $getopt;
+my $debug;
+my $help;
+
+my $input;
+my $output;
+my $number = "20";
+
+
+########### Get options, give help
+
+eval {
+ $getopt = GetOptions("debug" => \$debug,
+ "help" => \$help,
+ "number=s" => \$number,
+ "input=s" => \$input,
+ "output=s" => \$ouput);
+};
+
+if ($help) {
+ print STDERR <<EOF;
+Usage: $0 [OPTION] --input [FILE]
+
+A small program that take a kdeduca test file (.edu) as input with say 100
+question and output a kdeduca test file with 20 questions selected randomly.
+
+ -i, --input=FILE Input keduca file.
+ -o, --output=FILE Output keduca file, shrinked.
+ (By default, the suffix -shrinked will be added)
+ -n, --number=NUMBER Number expected of questions, in the shrinked
+ version.
+ ($number by default)
+
+Project Homepage: https://gna.org/projects/keduca-shrinker/
+EOF
+exit(1);
+}
+
+# Test input file existence
+unless ($input) {
+ print "No input file.\n";
+}
+unless (-r $input) {
+ print "Input file not readable.\n";
+ exit;
+}
+open(INPUT, "< $input");
+
+# Test output writability
+unless ($output) {
+ $output = $input;
+ $output =~ s/.edu$//;
+ $output .= "-shrinked.edu";
+}
+if (-e $output && ! -w $output) {
+ print "Output file not writable.\n";
+ exit;
+
+}
+open(OUTPUT, "> $output");
+
+########### Define subs
+
+sub fisher_yates_shuffle {
+ my $table = shift;
+ my $i;
+ for ($i = @$table; --$i;) {
+ my $j = int rand($i+1);
+ next if $i == $j;
+ @$table[$i,$j] = @$table[$j,$i];
+ }
+}
+
+
+########### Grab the file header, store questions in an array.
+# I know, it's XML, it may be simple to call an xml parser.
+# But in fact, we have nothing to parse here, we do not care about
+# the real content, so...
+my $structure = "header";
+my $header;
+my $footer;
+my @questions;
+my $newquestion;
+
+while (<INPUT>) {
+ ## Grab the structure (footer and header)
+ # the header last when data begins
+ # the footer begin when data ends
+
+ $header .= $_ if $structure eq "header";
+
+ $structure = "content" if /\<Data\>/m;
+ $structure = "footer" if /\<\/Data\>/m;
+
+ $footer .= $_ if $structure eq "footer";
+
+ ## Grab the questions
+ if ($structure eq "content") {
+ $newquestion .= $_;
+
+ # If we found the string </question>, that the end of a question
+ if (/\<\/question\>/m) {
+ push(@questions, $newquestion);
+ $newquestion = "";
+ }
+
+ }
+}
+
+########### Select the number of questions we want
+# warn the user if there's nothing to do
+if (scalar(@questions) < $number) {
+ print "There are only ".scalar(@questions)." questions in the input file, less than $number.\n";
+ # Copy & exit
+ system("cp", $input, $output);
+ exit;
+} else {
+ # Shuffle
+ fisher_yates_shuffle(\@questions);
+ # Keeps only the desired amount (number-1, as 0 is counted)
+ $#questions = ($number-1);
+}
+
+########### Final output
+print OUTPUT $header;
+print OUTPUT @questions;
+print OUTPUT $footer;
+
+close(INPUT);
+close(OUTPUT);