sad

commit 229ea70bcecc63cdd6c1ed1867d082ce02abcb01
parent 9629bb7fcfb64d9d523bd135f5b850c967c0be31
Author: sin <sin@2f30.org>
Date:   Thu, 25 Dec 2014 17:44:59 +0000

Implement prev command

Diffstat:
M
cmd.c
 | 
24
++++++++++++++++++++++++
M
playlist.c
 | 
21
+++++++++++++++++++++
M
sad.h
 | 
1
+

3 files changed, 46 insertions(+), 0 deletions(-)
diff --git a/cmd.c b/cmd.c
@@ -134,6 +134,30 @@ cmdplay(int fd, int argc, char **argv)
 static void
 cmdprev(int fd, int argc, char **argv)
 {
+	Song *s, *prev;
+
+	if (argc != 1) {
+		dprintf(fd, "ERR \"usage: prev\"\n");
+		return;
+	}
+
+	s = getcursong();
+	if (!s) {
+		dprintf(fd, "ERR \"no song active\"\n");
+		return;
+	}
+
+	prev = getprevsong(s);
+	if (!prev) {
+		dprintf(fd, "ERR \"invalid song id\"\n");
+		return;
+	}
+
+	decoder->close();
+	s->state = NONE;
+	prev->state = PREPARE;
+	putcursong(prev);
+	dprintf(fd, "OK\n");
 }
 
 static void
diff --git a/playlist.c b/playlist.c
@@ -79,6 +79,27 @@ getnextsong(Song *cur)
 }
 
 Song *
+getprevsong(Song *cur)
+{
+	Song *s;
+	int   i;
+
+	for (i = 0; i < playlist.nsongs; i++) {
+		s = &playlist.songs[i];
+		if (s->id == cur->id) {
+			break;
+		}
+	}
+	if (i == playlist.nsongs)
+		return NULL;
+	if (i == 0)
+		s = &playlist.songs[playlist.nsongs - 1];
+	else
+		s = &playlist.songs[i - 1];
+	return s;
+}
+
+Song *
 getcursong(void)
 {
 	return playlist.cursong;
diff --git a/sad.h b/sad.h
@@ -58,6 +58,7 @@ Song *addplaylist(const char *);
 Song *findsong(const char *);
 Song *findsongid(int);
 Song *getnextsong(Song *);
+Song *getprevsong(Song *);
 Song *getcursong(void);
 void putcursong(Song *);
 void dumpplaylist(int);