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zuke: add "composer" tag support (column hidden by default)

--- a/sys/man/1/zuke

+++ b/sys/man/1/zuke

@@ -53,7 +53,7 @@

 .TF "c"

 .TP

 .B A

-Artist

+Artist (displays composer if no artist has been set)

 .TP

 .B a

 Album

@@ -60,6 +60,9 @@

 .TP

 .B b

 File basename

+.TP

+.B C

+Composer

 .TP

 .B t

 Title

--- a/sys/src/cmd/audio/zuke/mkplist.c

+++ b/sys/src/cmd/audio/zuke/mkplist.c

@@ -104,6 +104,10 @@

 		if(aux->album == nil)

 			aux->album = strdup(v);

 		break;

+	case Tcomposer:

+		if(aux->composer == nil)

+			aux->composer = strdup(v);

+		break;

 	case Ttitle:

 		if(aux->title == nil)

 			aux->title = strdup(v);

@@ -331,6 +335,11 @@

 				return x;

 		}

 	}

+	if(i == 0 && a->composer != nil || b->composer != nil){

+		if(a->composer == nil && a->composer != nil) return -1;

+		if(a->composer != nil && a->composer == nil) return 1;

+		if((x = cistrcmp(a->composer, b->composer)) != 0) return x;

+	}

 	if(a->date != nil || b->date != nil){

 		if(a->date == nil && b->date != nil) return -1;

@@ -428,8 +437,8 @@

 	recvul(cexit);

 	for(i = 0; i < ntracks; i++){

-		if(tracks[i]->numartist < 1)

-			fprint(2, "no artists: %s\n", tracks[i]->path);

+		if(tracks[i]->numartist < 1 && tracks[i]->composer == nil)

+			fprint(2, "no artists/composer: %s\n", tracks[i]->path);

 		if(tracks[i]->title == nil)

 			fprint(2, "no title: %s\n", tracks[i]->path);

 		printmeta(&out, tracks[i]);

--- a/sys/src/cmd/audio/zuke/plist.c

+++ b/sys/src/cmd/audio/zuke/plist.c

@@ -15,6 +15,8 @@

 		Bprint(b, "%c %s\n", Palbum, m->album);

 	if(m->title != nil)

 		Bprint(b, "%c %s\n", Ptitle, m->title);

+	if(m->composer != nil)

+		Bprint(b, "%c %s\n", Pcomposer, m->composer);

 	if(m->date != nil)

 		Bprint(b, "%c %s\n", Pdate, m->date);

 	if(m->track != nil)

--- a/sys/src/cmd/audio/zuke/plist.h

+++ b/sys/src/cmd/audio/zuke/plist.h

@@ -14,6 +14,7 @@

 	Palbum=			'a',

 	Partist=		'A',

 	Pbasename=		'b',

+	Pcomposer=		'C',

 	Pdate=			'd',

 	Pduration=		'D',

 	Pfilefmt=		'f',

@@ -37,6 +38,7 @@

 {

 	char *artist[Maxartist];

 	char *album;

+	char *composer;

 	char *title;

 	char *date;

 	char *track;

--- a/sys/src/cmd/audio/zuke/zuke.c

+++ b/sys/src/cmd/audio/zuke/zuke.c

@@ -238,6 +238,7 @@

 	switch(c){

 	case Palbum: s = m->album; break;

 	case Partist: s = m->artist[0]; break;

+	case Pcomposer: s = m->composer; break;

 	case Pdate: s = m->date; break;

 	case Ptitle: s = (!colspath && (m->title == nil || *m->title == 0)) ? m->basename : m->title; break;

 	case Ptrack: snprint(tmp, sizeof(tmp), "%4s", m->track); s = m->track ? tmp : nil; break;

@@ -975,6 +976,8 @@

 			if(m->path != nil){

 				if(m->filefmt == nil)

 					m->filefmt = "";

+				if(m->numartist == 0 && m->composer != nil)

+					m->artist[m->numartist++] = m->composer;

 				pl->n++;

 				m++;

 			}

@@ -994,13 +997,14 @@

 			if(m->numartist < Maxartist)

 				m->artist[m->numartist++] = s;

 			break;

-		case Pfilefmt: m->filefmt = s; break;

-		case Palbum:   m->album = s; break;

-		case Pdate:    m->date = s; break;

-		case Ptitle:   m->title = s; break;

-		case Ptrack:   m->track = s; break;

-		case Prgtrack: m->rgtrack = atof(s); break;

-		case Prgalbum: m->rgalbum = atof(s); break;

+		case Pcomposer: m->composer = s; break;

+		case Pfilefmt:  m->filefmt = s; break;

+		case Palbum:    m->album = s; break;

+		case Pdate:     m->date = s; break;

+		case Ptitle:    m->title = s; break;

+		case Ptrack:    m->track = s; break;

+		case Prgtrack:  m->rgtrack = atof(s); break;

+		case Prgalbum:  m->rgalbum = atof(s); break;

 		case Ppath:

 			m->path = s;

 			m->basename = (b = utfrrune(s, '/')) == nil ? s : b+1;