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#include <mpd/idle.h>
#include <mpd/tag.h>
#include <mpd/status.h>
#include <mpd/client.h>
#include <stdio.h>
#include <assert.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <sys/wait.h>
#include <sys/types.h>
struct mpd_connection *conn;
typedef struct mpd_song mpd_song_t;
typedef struct mpd_status mpd_status_t;
#define MAINLOOP_ERROR do { handle_error(conn); return; } while (0)
#define MAX_HASH 1021
#define MAX_INFO_BUFF 256
#define MAX_OUTPUT_BUFF 2048
const char *host = "192.168.248.130";
unsigned int port = 6600;
const char *state_name[4] = {"unknown", "stopped", "now playing", "paused"};
const char *shell = "bash";
const char *trigger_command = "terminal-notifier -title '{title}: {state} ({elapsed_pct}%)' "
"-subtitle '{artist}' -message $'{album}\\\\n{track}' -sender com.apple.iTunes";
typedef const char *(*Hook_t)(mpd_status_t status, mpd_song_t song);
typedef struct Entry {
const char *name;
const char **content_ref;
struct Entry *next;
} Entry;
typedef struct {
Entry *head[MAX_HASH];
} HashTable;
HashTable *hash_table_create() {
HashTable *ht = (HashTable *)malloc(sizeof(HashTable));
memset(ht->head, sizeof(ht->head), 0);
return ht;
}
unsigned hash_table_hash_func(const char *name) {
unsigned int seed = 131, res = 0;
while (*name)
res = res * seed + (*name++ - 'a');
return res % MAX_HASH;
}
void hash_table_destroy(HashTable *ht) {
unsigned int i;
for (i = 0; i < MAX_HASH; i++)
{
Entry *e, *ne;
for (e = ht->head[i]; e; e = ne)
{
ne = e->next;
free(e);
}
}
}
void hash_table_register(HashTable *ht, const char *name, const char **content_ref) {
unsigned int hv = hash_table_hash_func(name);
Entry *e = (Entry *)malloc(sizeof(Entry));
e->name = name;
e->content_ref = content_ref;
e->next = ht->head[hv];
ht->head[hv] = e;
}
const char *hash_table_lookup(HashTable *ht, const char *name) {
unsigned int hv = hash_table_hash_func(name);
Entry *e;
for (e = ht->head[hv]; e; e = e->next)
if (!strcmp(e->name, name))
return *(e->content_ref);
return NULL;
}
char etime_buff[MAX_INFO_BUFF], ttime_buff[MAX_INFO_BUFF], epct_buff[MAX_INFO_BUFF];
const char *title, *artist, *album, *track, *state,
*elapsed_time = etime_buff, *total_time = ttime_buff, *elapsed_pct = epct_buff;
HashTable *dict;
void handle_error(struct mpd_connection *conn) {
fprintf(stderr, "%s\n", mpd_connection_get_error_message(conn));
mpd_connection_free(conn);
}
const char *filter(const char *input) {
static char output_buff[MAX_OUTPUT_BUFF];
static char token_buff[MAX_INFO_BUFF];
char *optr = output_buff, *tptr = token_buff;
enum {
ESCAPE,
IN_TOKEN,
NORMAL
} state = NORMAL;
while (*input)
{
if (state == NORMAL)
{
if (*input == '\\')
state = ESCAPE;
else if (*input == '{')
state = IN_TOKEN;
else
*optr++ = *input;
}
else if (state == IN_TOKEN)
{
if (*input == '}')
{
size_t csize;
const char *content;
*tptr = '\0'; /* mark the end of the token */
if ((content = hash_table_lookup(dict, token_buff)))
{
csize = strlen(content);
memmove(optr, content, csize);
optr += csize;
}
tptr = token_buff;
state = NORMAL;
}
else *tptr++ = *input;
}
else
{
*optr++ = *input;
state = NORMAL;
}
input++;
}
*optr = '\0';
return output_buff;
}
void trigger(const char *filtered_cmd) {
pid_t pid;
int fd[2];
pipe(fd);
fprintf(stderr, "executing: %s\n", filtered_cmd);
if ((pid = fork()) == -1)
{
fprintf(stderr, "failed to fork\n");
return;
}
else if (!pid)
{
dup2(fd[0], 0); /* override stdin */
close(fd[0]);
close(fd[1]);
execlp(shell, shell, (char *)NULL);
}
close(fd[0]);
write(fd[1], filtered_cmd, strlen(filtered_cmd));
close(fd[1]);
waitpid(pid, NULL, 0);
}
void main_loop() {
for (;;)
{
int idle_info;
mpd_song_t *song;
mpd_status_t *status;
if (mpd_connection_get_error(conn) != MPD_ERROR_SUCCESS)
MAINLOOP_ERROR;
mpd_send_idle_mask(conn, MPD_IDLE_PLAYER);
idle_info = mpd_recv_idle(conn, 1);
if (!idle_info) MAINLOOP_ERROR;
fprintf(stderr, "new event: %s(%d)\n", mpd_idle_name(idle_info), idle_info);
if (idle_info == MPD_IDLE_PLAYER)
{
int et, tt;
mpd_send_status(conn);
status = mpd_recv_status(conn);
if (!status) MAINLOOP_ERROR;
state = state_name[mpd_status_get_state(status)];
et = mpd_status_get_elapsed_time(status);
tt = mpd_status_get_total_time(status);
sprintf(etime_buff, "%i", et);
sprintf(ttime_buff, "%i", tt);
sprintf(epct_buff, "%d", tt ? et * 100 / tt : 0);
mpd_status_free(status);
mpd_send_current_song(conn);
while ((song = mpd_recv_song(conn)) != NULL)
{
title = mpd_song_get_tag(song, MPD_TAG_TITLE, 0);
artist = mpd_song_get_tag(song, MPD_TAG_ARTIST, 0);
album = mpd_song_get_tag(song, MPD_TAG_ALBUM, 0);
track = mpd_song_get_tag(song, MPD_TAG_TRACK, 0);
trigger(filter(trigger_command));
mpd_song_free(song);
}
}
}
}
int main() {
int i;
dict = hash_table_create();
hash_table_register(dict, "title", &title);
hash_table_register(dict, "artist", &artist);
hash_table_register(dict, "album", &album);
hash_table_register(dict, "track", &track);
hash_table_register(dict, "state", &state);
hash_table_register(dict, "elapsed_time", &elapsed_time);
hash_table_register(dict, "total_time", &total_time);
hash_table_register(dict, "elapsed_pct", &elapsed_pct);
for (;;)
{
fprintf(stderr, "trying to connect %s:%d\n", host, port);
conn = mpd_connection_new(host, port, 0);
main_loop();
fprintf(stderr, "reconnecting\n");
sleep(2);
}
}
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