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mkplist: use bio; prioritize composers and lead performers over any other id3v2-specific tags

--- a/mkplist.c

+++ b/mkplist.c

@@ -1,5 +1,6 @@

 #include <u.h>

 #include <libc.h>

+#include <bio.h>

 #include <tags.h>

 #include "plist.h"

@@ -11,10 +12,12 @@

 #define MAX(a, b) (a > b ? a : b)

-static int fd;

+static Biobuf *bf;

 static Meta *curr;

 static Meta *all;

 static int numall;

+static int firstiscomposer;

+static int keepfirstartist;

 static void

 freemeta(Meta *m)

@@ -49,9 +52,9 @@

 }

 static void

-cb(Tagctx *ctx, int t, const char *v, int offset, int size, Tagread f)

+cb(Tagctx *ctx, int t, const char *k, const char *v, int offset, int size, Tagread f)

 {

-	int i;

+	int i, iscomposer;

 	USED(ctx);

@@ -58,6 +61,19 @@

 	switch(t){

 	case Tartist:

 		if(curr->numartist < Maxartist){

+			iscomposer = strcmp(k, "TCM") == 0 || strcmp(k, "TCOM") == 0;

+			/* prefer lead performer/soloist, helps when TP2/TPE2 is the first one and is set to "VA" */

+			/* always put composer first, if available */

+			if(iscomposer || (!keepfirstartist && (strcmp(k, "TP1") == 0 || strcmp(k, "TPE1") == 0))) {

+				if(curr->numartist > 0)

+					curr->artist[curr->numartist] = curr->artist[curr->numartist-1];

+				curr->artist[0] = strdup(v);

+				curr->numartist++;

+				keepfirstartist = 1;

+				firstiscomposer = iscomposer;

+				return;

+			}

+

 			for(i = 0; i < curr->numartist; i++){

 				if(cistrcmp(curr->artist[i], v) == 0)

 					return;

@@ -96,7 +112,7 @@

 ctxread(Tagctx *ctx, void *buf, int cnt)

 {

 	USED(ctx);

-	return read(fd, buf, cnt);

+	return Bread(bf, buf, cnt);

 }

 static int

@@ -103,7 +119,7 @@

 ctxseek(Tagctx *ctx, int offset, int whence)

 {

 	USED(ctx);

-	return seek(fd, offset, whence);

+	return Bseek(bf, offset, whence);

 }

 static char buf[4096];

@@ -162,11 +178,12 @@

 			if((d->mode & DMDIR) == 0){

 				ctx.filename = path;

-				if((fd = open(path, OREAD)) < 0)

+				if((bf = Bopen(path, OREAD)) == nil)

 					fprint(2, "%s: %r\n", path);

 				else if((curr = newmeta()) == nil)

 					sysfatal("no memory");

 				else{

+					firstiscomposer = keepfirstartist = 0;

 					if(tagsget(&ctx) != 0)

 						fprint(2, "%s: no tags\n", path);

 					if(ctx.duration == 0)

@@ -181,7 +198,7 @@

 					curr->path = strdup(path);

 					curr->duration = ctx.duration;

 				}

-				close(fd);

+				Bterm(bf);

 			}else if(depth < Maxdepth){ /* recurse into the directory */

 				scan(dir, depth+1);

 				path = *dir;