+/*
+ * This file is part of DisOrder.
+ * Copyright (C) 2004, 2005, 2006, 2007 Richard Kettlewell
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+ * USA
+ */
+
+#include <config.h>
+#include "types.h"
+
+#include <string.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <errno.h>
+#include <time.h>
+
+#include "mem.h"
+#include "log.h"
+#include "split.h"
+#include "printf.h"
+#include "queue.h"
+#include "server-queue.h"
+#include "eventlog.h"
+#include "plugin.h"
+#include "basen.h"
+#include "configuration.h"
+#include "inputline.h"
+#include "disorder.h"
+
+/* the head of the queue is played next, so normally we add to the tail */
+struct queue_entry qhead = { &qhead, &qhead, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
+
+/* the head of the recent list is the oldest thing, the tail the most recently
+ * played */
+struct queue_entry phead = { &phead, &phead, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
+
+static long pcount;
+
+/* add new entry @n@ to a doubly linked list just after @b@ */
+static void l_add(struct queue_entry *b, struct queue_entry *n) {
+ n->prev = b;
+ n->next = b->next;
+ n->next->prev = n;
+ n->prev->next = n;
+}
+
+/* remove an entry from a doubly-linked list */
+static void l_remove(struct queue_entry *node) {
+ node->next->prev = node->prev;
+ node->prev->next = node->next;
+}
+
+void queue_fix_sofar(struct queue_entry *q) {
+ long sofar;
+
+ /* Fake up SOFAR field for currently-playing tracks that don't have it filled
+ * in by the speaker process. XXX this horrible bodge should go away when we
+ * have a more general implementation of pausing as that field will always
+ * have to be right for the playing track. */
+ if((q->state == playing_started
+ || q->state == playing_paused)
+ && q->type & DISORDER_PLAYER_PAUSES
+ && (q->type & DISORDER_PLAYER_TYPEMASK) != DISORDER_PLAYER_RAW) {
+ if(q->lastpaused) {
+ if(q->uptopause == -1) /* Don't know how far thru. */
+ sofar = -1;
+ else if(q->lastresumed) /* Has been paused and resumed. */
+ sofar = q->uptopause + time(0) - q->lastresumed;
+ else /* Currently paused. */
+ sofar = q->uptopause;
+ } else /* Never been paused. */
+ sofar = time(0) - q->played;
+ q->sofar = sofar;
+ }
+}
+
+static void queue_read_error(const char *msg,
+ void *u) {
+ fatal(0, "error parsing queue %s: %s", (const char *)u, msg);
+}
+
+static void queue_do_read(struct queue_entry *head, const char *path) {
+ char *buffer;
+ FILE *fp;
+ struct queue_entry *q;
+
+ if(!(fp = fopen(path, "r"))) {
+ if(errno == ENOENT)
+ return; /* no queue */
+ fatal(errno, "error opening %s", path);
+ }
+ head->next = head->prev = head;
+ while(!inputline(path, fp, &buffer, '\n')) {
+ q = xmalloc(sizeof *q);
+ queue_unmarshall(q, buffer, queue_read_error, (void *)path);
+ if(head == &qhead
+ && (!q->track
+ || !q->when))
+ fatal(0, "incomplete queue entry in %s", path);
+ l_add(head->prev, q);
+ }
+ if(ferror(fp)) fatal(errno, "error reading %s", path);
+ fclose(fp);
+}
+
+void queue_read(void) {
+ queue_do_read(&qhead, config_get_file("queue"));
+}
+
+void recent_read(void) {
+ struct queue_entry *q;
+
+ queue_do_read(&phead, config_get_file("recent"));
+ /* reset pcount after loading */
+ pcount = 0;
+ q = phead.next;
+ while(q != &phead) {
+ ++pcount;
+ q = q->next;
+ }
+}
+
+static void queue_do_write(const struct queue_entry *head, const char *path) {
+ char *tmp;
+ FILE *fp;
+ struct queue_entry *q;
+
+ byte_xasprintf(&tmp, "%s.new", path);
+ if(!(fp = fopen(tmp, "w"))) fatal(errno, "error opening %s", tmp);
+ for(q = head->next; q != head; q = q->next)
+ if(fprintf(fp, "%s\n", queue_marshall(q)) < 0)
+ fatal(errno, "error writing %s", tmp);
+ if(fclose(fp) < 0) fatal(errno, "error closing %s", tmp);
+ if(rename(tmp, path) < 0) fatal(errno, "error replacing %s", path);
+}
+
+void queue_write(void) {
+ queue_do_write(&qhead, config_get_file("queue"));
+}
+
+void recent_write(void) {
+ queue_do_write(&phead, config_get_file("recent"));
+}
+
+static void queue_id(struct queue_entry *q) {
+ static unsigned long serial;
+ unsigned long a[3];
+ char buffer[128];
+
+ a[0] = serial++ & 0xFFFFFFFFUL;
+ a[1] = time(0) & 0xFFFFFFFFUL;
+ a[2] = getpid() & 0xFFFFFFFFUL;
+ basen(a, 3, buffer, sizeof buffer, 62);
+ q->id = xstrdup(buffer);
+}
+
+struct queue_entry *queue_add(const char *track, const char *submitter,
+ int where) {
+ struct queue_entry *q, *beforeme;
+
+ q = xmalloc(sizeof *q);
+ q->track = xstrdup(track);
+ q->submitter = submitter ? xstrdup(submitter) : 0;
+ q->state = playing_unplayed;
+ queue_id(q);
+ time(&q->when);
+ switch(where) {
+ case WHERE_START:
+ l_add(&qhead, q);
+ break;
+ case WHERE_END:
+ l_add(qhead.prev, q);
+ break;
+ case WHERE_BEFORE_RANDOM:
+ /* We want to find the point in the queue before the block of random tracks
+ * at the end. */
+ beforeme = &qhead;
+ while(beforeme->prev != &qhead
+ && beforeme->prev->state == playing_random)
+ beforeme = beforeme->prev;
+ l_add(beforeme->prev, q);
+ break;
+ }
+ /* submitter will be a null pointer for a scratch */
+ if(submitter)
+ notify_queue(track, submitter);
+ eventlog_raw("queue", queue_marshall(q), (const char *)0);
+ return q;
+}
+
+int queue_move(struct queue_entry *q, int delta, const char *who) {
+ int moved = 0;
+ char buffer[20];
+
+ /* not the most efficient approach but hopefuly relatively comprehensible:
+ * the idea is that for each step we determine which nodes are affected, and
+ * fill in all the links starting at the 'prev' end and moving towards the
+ * 'next' end. */
+
+ while(delta > 0 && q->prev != &qhead) {
+ struct queue_entry *n, *p, *pp;
+
+ n = q->next;
+ p = q->prev;
+ pp = p->prev;
+ pp->next = q;
+ q->prev = pp;
+ q->next = p;
+ p->prev = q;
+ p->next = n;
+ n->prev = p;
+ --delta;
+ ++moved;
+ }
+
+ while(delta < 0 && q->next != &qhead) {
+ struct queue_entry *n, *p, *nn;
+
+ p = q->prev;
+ n = q->next;
+ nn = n->next;
+ p->next = n;
+ n->prev = p;
+ n->next = q;
+ q->prev = n;
+ q->next = nn;
+ nn->prev = q;
+ ++delta;
+ --moved;
+ }
+
+ if(moved) {
+ info("user %s moved %s", who, q->id);
+ notify_queue_move(q->track, who);
+ sprintf(buffer, "%d", moved);
+ eventlog("moved", who, (char *)0);
+ }
+
+ return delta;
+}
+
+static int find_in_list(struct queue_entry *needle,
+ int nqs, struct queue_entry **qs) {
+ int n;
+
+ for(n = 0; n < nqs; ++n)
+ if(qs[n] == needle)
+ return 1;
+ return 0;
+}
+
+void queue_moveafter(struct queue_entry *target,
+ int nqs, struct queue_entry **qs,
+ const char *who) {
+ struct queue_entry *q;
+ int n;
+
+ /* Normalize */
+ if(!target)
+ target = &qhead;
+ else
+ while(find_in_list(target, nqs, qs))
+ target = target->prev;
+ /* Do the move */
+ for(n = 0; n < nqs; ++n) {
+ q = qs[n];
+ l_remove(q);
+ l_add(target, q);
+ target = q;
+ /* Log the individual tracks */
+ info("user %s moved %s", who, q->id);
+ notify_queue_move(q->track, who);
+ }
+ /* Report that the queue changed to the event log */
+ eventlog("moved", who, (char *)0);
+}
+
+void queue_remove(struct queue_entry *which, const char *who) {
+ if(who) {
+ info("user %s removed %s", who, which->id);
+ notify_queue_move(which->track, who);
+ }
+ eventlog("removed", which->id, who, (const char *)0);
+ l_remove(which);
+}
+
+struct queue_entry *queue_find(const char *key) {
+ struct queue_entry *q;
+
+ for(q = qhead.next;
+ q != &qhead && strcmp(q->track, key) && strcmp(q->id, key);
+ q = q->next)
+ ;
+ return q != &qhead ? q : 0;
+}
+
+void queue_played(struct queue_entry *q) {
+ while(pcount && pcount >= config->history) {
+ eventlog("recent_removed", phead.next->id, (char *)0);
+ l_remove(phead.next);
+ pcount--;
+ }
+ if(config->history) {
+ eventlog_raw("recent_added", queue_marshall(q), (char *)0);
+ l_add(phead.prev, q);
+ ++pcount;
+ }
+}
+
+/*
+Local Variables:
+c-basic-offset:2
+comment-column:40
+fill-column:79
+indent-tabs-mode:nil
+End:
+*/
~mdw / disorder / commitdiff