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#!/usr/bin/env perl
use 5.012;
use strict;
use warnings;
use JSON;
use IPC::Open2;
my @markdown = qw/cmark --smart --safe/;
my $question;
my $single_choice;
my $source;
my $media;
my %last_option;
my @options;
my @questions = ();
sub md { # pipe through $markdown
my ($input) = @_;
my $pid = open2(\*OUT, \*IN, @markdown)
or die "open2() failed $!";
print IN $input;
close(IN);
waitpid($pid, 0);
return do { local $/; <OUT> };
}
sub add {
return unless %last_option;
if (defined $last_option{"comment"}) {
$last_option{"comment"} = md($last_option{"comment"});
}
push(@options, {%last_option});
}
while (<>) {
chomp;
if (/^.$/) {
add();
die "end of block without a question at line $.\n"
unless defined $question;
my %ent =
(
"question" => md($question),
"options" => [@options],
"multiple" => ($single_choice eq "0" ? \0 : \1)
);
$ent{"source"} = $source if defined $source;
$ent{"media"} = $media if defined $media;
push(@questions, { %ent });
undef $question;
undef $single_choice;
undef $source;
undef $media;
undef %last_option;
undef @options;
} elsif (/^([01])(.*?)(?:\(([^()]*)\))?$/) {
$single_choice = $1;
$question = $2;
chomp $question;
$source = $3;
chomp $source if $source;
} elsif (/^@(.*)/) {
$media = $1;
chomp $media;
} elsif (/^([-+?])\s*(.*)/) {
add();
%last_option =
(
"option" => $2,
"correct" => $1 eq "+" ? JSON::true : $1 eq "-" ? JSON::false : JSON::null
);
} elsif (/^.+$/) { # non-empty line
$last_option{"comment"} .= "$_\n";
}
}
say (to_json @questions);