From ce9c0d7fb3b281c4e3fec9de752729ad707483c1 Mon Sep 17 00:00:00 2001
From: Jason Miller <aidenn0@geocities.com>
Date: Mon, 2 Feb 2026 22:17:22 -0800
Subject: [PATCH] Automatic determination of disc number

Allows passing "-W auto" to automatically set disc number and total
number of discs when metadata fetcher can provide that info.

Adds support for fetching disc number and total number of discs to
abcde-musicbrainz-tool
---
 abcde                  | 51 ++++++++++++++++++++++++++++--------------
 abcde-musicbrainz-tool | 10 +++++++++
 2 files changed, 44 insertions(+), 17 deletions(-)

diff --git a/abcde b/abcde
index 9f36d70..5234619 100755
--- a/abcde
+++ b/abcde
@@ -4067,6 +4067,18 @@ post_encode ()
 :
 }
 
+parse_multidisc() {
+	local multidisc_info rest
+	multidisc_info="${ABCDETEMPDIR}/multidisc.$(checkstatus cddb-choice)"
+    if [[ -n "$AUTOMATIC_DISCNUMBER" && -e "$multidisc_info" ]]; then
+		read -r DISCNUMBER DISCTOTAL  < "$multidisc_info"
+		STARTTRACKNUMBER="${DISCNUMBER}$(printf "%02d" "${STARTTRACKNUMBER:-01}")"
+		STARTTRACKNUMBERTAG="y"
+        COMMENT="CD ${DISCNUMBER}/${DISCTOTAL}"
+	fi
+}
+
+
 ###############################################################################
 # End of functions
 #
@@ -4513,24 +4525,27 @@ while getopts 1a:bBc:C:d:DefgGhj:klLmMnNo:pPQ:r:s:S:t:T:UvVxX:w:W:z opt ; do
 		   ;;
 		W)
 		   re='^[0-9]+([,][0-9]+)?$'
-		   if ! [[ "${OPTARG}" =~ $re ]]; then 
-		   	log error 'Argument of -W must be discnumber[,disctotal]'
-                        exit 1
+           if [[ "${OPTARG}" =~ $re ]]; then 
+               DISCNUMBER=$( echo "$OPTARG" | cut -f1 -d',' )
+               DISCTOTAL=$( echo "$OPTARG" | cut -f2 -d',' -s )
+               if echo "${DISCTOTAL}" | grep "[[:digit:]]" > /dev/null 2>&1  ; then
+                   if [ $DISCNUMBER -gt $DISCTOTAL ]; then
+                       log error "discnumber (${DISCNUMBER}) cannot be higher than disctotal (${DISCTOTAL})"
+                       exit 1
                    fi
-		   DISCNUMBER=$( echo "$OPTARG" | cut -f1 -d',' )
-		   DISCTOTAL=$( echo "$OPTARG" | cut -f2 -d',' -s )
-		   if echo "${DISCTOTAL}" | grep "[[:digit:]]" > /dev/null 2>&1  ; then
-		   	if [ $DISCNUMBER -gt $DISCTOTAL ]; then
-		   		log error "discnumber (${DISCNUMBER}) cannot be higher than disctotal (${DISCTOTAL})"
-		   		exit 1
-		   	fi
-		   	COMMENT="CD ${DISCNUMBER}/${DISCTOTAL}"
-		   else
-		   	COMMENT="CD ${DISCNUMBER}"
-		   fi
-		   STARTTRACKNUMBER="${DISCNUMBER}$(printf "%02d" "${STARTTRACKNUMBER:-01}")"
-		   STARTTRACKNUMBERTAG="y"
-		   vecho Comment is "${COMMENT}" >&2
+                   COMMENT="CD ${DISCNUMBER}/${DISCTOTAL}"
+               else
+                   COMMENT="CD ${DISCNUMBER}"
+               fi
+               STARTTRACKNUMBER="${DISCNUMBER}$(printf "%02d" "${STARTTRACKNUMBER:-01}")"
+               STARTTRACKNUMBERTAG="y"
+               vecho Comment is "${COMMENT}" >&2
+           elif [[ "$OPTARG" = auto ]]; then
+               AUTOMATIC_DISCNUMBER=yes
+           else
+               log error 'Argument of -W must be discnumber[,disctotal] or "auto"'
+               exit 1
+           fi
 		   ;;
 		z) DEBUG=y ; CDROMREADERSYNTAX=debug ; EJECTCD="n" ;;
 		?) usage; exit ;;
@@ -5528,6 +5543,8 @@ if [ "$DOCDDB" = "y" ]; then
 	do_cddbedit
 
 	eval "$($CDDBTOOL parse "$CDDBDATA")"
+
+    parse_multidisc
 fi
 
 # Before reading tracks, we set the speed of the device
diff --git a/abcde-musicbrainz-tool b/abcde-musicbrainz-tool
index 34ace84..e94621d 100644
--- a/abcde-musicbrainz-tool
+++ b/abcde-musicbrainz-tool
@@ -19,6 +19,7 @@ use MusicBrainz::DiscID;
 use WebService::MusicBrainz 1.0.4;
 use Getopt::Long;
 use Pod::Usage;
+use List::Util qw(max);
 
 my $FRAMES_PER_S = 75;
 
@@ -155,6 +156,8 @@ if ($command =~ m/^id/) {
 	    my $medium = @mediums[0];
 	    my @tracks = @{ $medium->{'tracks'} };
 
+	    my $position = $medium->{'position'};
+	    my $max_pos = (max (map { $_->{'position'} } @{$release->{'media'}}));
 	    my $total_len = 0;
 	    for (my $i = 0; $i < scalar(@tracks); $i++) {
 		my $track = $tracks[$i];
@@ -209,6 +212,13 @@ if ($command =~ m/^id/) {
 	    print OUT $release->{'asin'};
 	    close OUT;
 
+	    if ($max_pos > 1) {
+		open (OUT, "> $workdir/multidisc.$releasenum");
+		print OUT $position . " " . $max_pos;
+		close OUT;
+	    }
+
+
 	    # Check to see that this entry is unique; generate a checksum
 	    # and compare to any previous checksums
 	    my $checksum = calc_sha1("$workdir/cddbread.$releasenum");