added bookdl.pl for downloading books from lainchan

perl-script/bookdl.pl

@@ -0,0 +1,92 @@
+#!/usr/bin/perl
+
+binmode STDOUT, ":utf8";
+
+use warnings;
+use strict;
+
+use JSON;
+
+my $THREAD_NO;
+my $URL_PREFIX;
+
+my $FN;
+my $OUT_DIR;
+
+my %jh;
+
+my @a1;
+
+$URL_PREFIX = "https://lainchan.org/lit/src/";
+$THREAD_NO = 4953;
+$FN = "$THREAD_NO.json";
+$OUT_DIR = "./dl/";
+
+# Read JSON with list of files
+open FILE, "<", $FN or die "could not open file";
+do{
+    my $json_str;
+
+    local $/=undef;
+    
+    $json_str = <FILE>;
+    chomp $json_str;
+    
+    %jh = %{JSON->new()->decode($json_str)};
+};
+close FILE;
+
+# anonymous function that returns a list
+# of tuples of the below form:
+#     (file_name, file_url)
+@a1 = sub{
+    my @a0;
+    my @a2;
+
+    my $f1;
+
+    # filters for file types we
+    # dont want to downloads
+    sub f1 {
+	return $_[0]->{"ext"} && !($_[0]->{"ext"} =~ /jpe?g/);
+    }
+    sub f2 {
+	return !($_[0]->{"ext"} =~ /png/);
+    }
+    sub f3 {
+	return !($_[0]->{"ext"} =~ /gif/);
+    }
+    sub f4 {
+	return !($_[0]->{"ext"} =~ /webm/);
+    }
+    sub f0 {
+	return f1($_[0]) && f2($_[0]) && f3($_[0]) && f4($_[0])	
+    }
+
+    # create an array of files
+    # that meet our file ext requirement
+    @a0 = grep {f0($_)} @{$jh{"posts"}};
+
+    # do the same filter on the
+    # extra_files attribute
+    @a2 = grep {
+	f0($_)
+    } map {
+	@{$_->{"extra_files"}}
+    } grep {
+	$_->{"extra_files"}
+    } @{$jh{"posts"}};
+
+    # Return our tuple
+    return map {
+	[
+	 sprintf("%s%s", $_->{"filename"}, $_->{"ext"}),          # file_name
+	 sprintf("%s%s%s", $URL_PREFIX, $_->{"tim"}, $_->{"ext"}) # file_url
+	]
+    } (@a0, @a2);
+}->();
+
+# Print a list of wget commands from our tuples
+for my $i1 (@a1){
+    printf("wget -N %s -O '%s%s'\n", scalar $i1->[1], $OUT_DIR, scalar $i1->[0]);
+}