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mpd-show.c
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mpd-show.c
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/*
* Prints song MPD's curently playing.
* Copyright 2005-2011 by Michal Nazarewicz (mina86/AT/mina86.com)
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*
* This is part of Tiny Applications Collection
* -> http://tinyapps.sourceforge.net/
*/
#define APP_VERSION "0.19"
#define HAVE_ICONV 1
#define _POSIX_C_SOURCE 2
#define _BSD_SOURCE
#define _DEFAULT_SOURCE
#include <errno.h>
#include <stdint.h>
#include <wchar.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <signal.h>
#include <limits.h>
#include <locale.h>
#if HAVE_ICONV
# include <iconv.h>
# include <langinfo.h>
#endif
#include "libmpdclient.h"
#ifdef SIGWINCH
# include <termios.h>
# ifndef TIOCGWINSZ
# include <sys/ioctl.h>
# endif
#endif
#if defined SIGWINCH && defined TIOCGWINSZ
# define HAVE_RESIZE 1
#else
# define HAVE_RESIZE 0
# warn No SIGWINCH support.
#endif
/******************** Misc **************************************************/
#if __GNUC__ <= 2
# define __attribute__(x)
#endif
const char *argv0 = "mpd-show";
static void _die(int perr, const char *fmt, ...)
__attribute__((noreturn, format(printf, 2, 3), cold));
#define die_on(cond, ...) do { if (cond) _die(0, __VA_ARGS__); } while (0)
#define pdie_on(cond, ...) do { if (cond) _die(1, __VA_ARGS__); } while (0)
/********** Defaults **********/
#define DEFAULT_HOST "localhost"
#define DEFAULT_PORT 6600
#define DEFAULT_COLUMNS 80
#define DEFAULT_FORMAT \
"[[[%artist% <&%album%> ]|%artist% - |<%album%> ]" \
"&[[%track%. &%title%]|%title%]]" \
"|[%track%. &%title%]|%title%|%filenoext%"
/******************** Terminal **********************************************/
static void termInit(void);
static void termBeginLine(void);
static void termNormal(void);
static void termEndLine(void);
/******************** Main functions ****************************************/
static void parseArguments(int argc, char **argv)
__attribute__((nonnull));
static void daemonize(void);
static void registerSignalHandlers(void);
static int connectToMPD(unsigned timeout);
static void disconnectFromMPD(void);
static int getSong(void);
static void display(unsigned secs);
static void initCodesets(void);
static int done(void);
static int error(void) __attribute__((pure));
int main(int argc, char **argv) {
unsigned timeout = 1, connected = 0;
initCodesets();
parseArguments(argc, argv);
daemonize();
registerSignalHandlers();
termInit();
atexit(disconnectFromMPD);
do {
if (!connected) {
timeout = timeout <= 30 ? timeout * 2 : 60;
connected = connectToMPD(timeout > 10 ? 10 : timeout);
}
if (connected) {
timeout = 1;
connected = getSong();
}
display(timeout);
} while (!done());
return 0;
}
/******************** Global data *******************************************/
struct {
mpd_Connection *conn;
mpd_InfoEntity *info;
struct state {
int error;
int state;
int songid;
int pos;
int len;
unsigned hilightPos;
unsigned scroll;
unsigned columns;
} cur, old;
const wchar_t *format;
wchar_t *line;
size_t line_len, line_capacity;
const char *host;
const char *password;
unsigned short port;
unsigned short background;
volatile sig_atomic_t gotSignal;
volatile sig_atomic_t width;
} D;
static int done(void) {
return D.gotSignal;
}
static int error(void) {
return !!(D.conn->error);
}
/******************** Initialisation ****************************************/
static void handleSignal(int sig) __attribute__((cold));
static void handleResize(int sig) __attribute__((cold));
static const wchar_t *wideFromMulti(const char *str) __attribute__((nonnull));
static void usage(void) __attribute__((noreturn));
static void usage(void)
{
printf("mpd-show " APP_VERSION " (c) 2005-2011 by Michal Nazarewicz (mina86/AT/mina86.com)\n"
"usage: %s [ <options> ] [ <host>[:<port> | <port> ]]\n"
" -b -B runs in background mode; -B also forks into background\n"
" -c<col> assumes <col>-char wide term [$COLUMNS or %d]"
#if HAVE_RESIZE
" (obsolete)"
#endif
"\n"
" -f<fmt> uses <fmt> for displaying song (see mpc(1)); supports following tags:\n",
argv0, DEFAULT_COLUMNS);
printf(" album, artist, comment, composer, date, dir, disc, file, filenoext,\n"
" genre, name, path, pathnoext, time, title, track and Y pseudo tag.\n"
" <host> host MPD is listening on optionally prefixed with '<password>@'\n"
" [$MPD_HOST or " DEFAULT_HOST "]\n"
" <port> port MPD is listening on [$MPD_PORT or %u]\n",
DEFAULT_PORT);
exit(0);
}
static void parseArguments(int argc, char **argv) {
const char *hostarg = 0, *portarg = 0, *format;
char *end;
int opt;
/* Program name */
argv0 = strrchr(argv[0], '/');
argv0 = argv0 && argv0[1] ? argv0 + 1 : *argv;
/* Help */
if (argc > 1 && !strcmp(argv[1], "--help")) {
usage();
}
/* Some defaults */
format = DEFAULT_FORMAT;
/* Get opts */
while ((opt = getopt(argc, argv, "-hbBc:f:"))!=-1) {
switch (opt) {
case 'h': usage();
case 'b': D.background = 1; break;
case 'B': D.background = 2; break;
/* Columns */
case 'c': {
unsigned long c = strtoul(optarg, &end, 0);
die_on(c < 3 || c > UINT_MAX || *end,
"invalid terminal width: %s", optarg);
D.cur.columns = c;
break;
}
/* Format */
case 'f':
format = optarg;
break;
/* An argument */
case 1:
if (!hostarg) { hostarg = optarg; break; }
if (!portarg) { portarg = optarg; break; }
die_on(1, "invalid argument: %s", optarg);
/* An error */
default:
die_on(1, "invalid option: %c", optopt);
}
}
/* Host, password and port */
if (!hostarg) {
hostarg = getenv("MPD_HOST");
}
if (!hostarg) {
hostarg = DEFAULT_HOST;
}
end = strchr(hostarg, '@');
if (end) {
/* If '@' has been found we got host from either command line
* or environment and in both cases the string is
* modifiable. */
*end = 0;
D.password = hostarg;
hostarg = end + 1;
}
D.host = hostarg;
if (!portarg) {
portarg = getenv("MPD_PORT");
}
if (!portarg) {
end = strchr(hostarg, ':');
if (end) {
*end = 0;
portarg = end + 1;
}
}
if (!portarg) {
D.port = DEFAULT_PORT;
} else {
unsigned long p = strtoul(portarg, &end, 0);
die_on(p <= 0 || p > 0xffff || *end, "invalid port: %s", portarg);
D.port = p;
}
/* Format */
D.format = wideFromMulti(format);
/* Columns */
#if HAVE_RESIZE
if (!D.cur.columns) {
handleResize(SIGWINCH);
D.cur.columns = D.width;
}
#endif
if (!D.cur.columns) {
end = getenv("COLUMNS");
if (end) {
unsigned long c = strtoul(end, &end, 0);
if (c >= 3 && c <= UINT_MAX && !*end) {
D.cur.columns = c;
}
}
}
if (!D.cur.columns) {
D.cur.columns = DEFAULT_COLUMNS;
}
D.width = D.cur.columns;
}
static void daemonize(void) {
if (D.background > 1) {
pid_t pid = fork();
pdie_on(pid < 0, "fork");
if (pid) {
printf("[%ld]\n", (long)pid);
_exit(0);
}
}
}
static void registerSignalHandlers(void) {
#if HAVE_RESIZE
signal(SIGWINCH, handleResize);
#endif
#ifdef SIGHUP
signal(SIGHUP , handleSignal);
#endif
#ifdef SIGINT
signal(SIGINT , handleSignal);
#endif
#ifdef SIGQUIT
signal(SIGQUIT , handleSignal);
#endif
#ifdef SIGTERM
signal(SIGTERM , handleSignal);
#endif
}
static void handleSignal(int sig) {
if (D.gotSignal) {
exit(1);
}
D.gotSignal = 1;
signal(sig, handleSignal);
}
#if HAVE_RESIZE
static void handleResize(int sig) {
struct winsize size;
if (ioctl(1, TIOCGWINSZ, &size) >= 0 && size.ws_col) {
D.width = size.ws_col;
}
signal(sig, handleResize);
}
#endif
/******************** Connection handling ***********************************/
static int connectToMPD(unsigned timeout) {
disconnectFromMPD();
D.conn = mpd_newConnection(D.host, D.port, timeout);
pdie_on(!D.conn, "connect");
if (D.password && !error()) {
mpd_sendPasswordCommand(D.conn, D.password);
if (!error()) {
mpd_finishCommand(D.conn);
}
}
return !error();
}
static void disconnectFromMPD(void) {
if (D.conn) {
mpd_closeConnection(D.conn);
D.conn = 0;
}
if (D.info) {
mpd_freeInfoEntity(D.info);
D.info = 0;
}
D.cur.songid = -1;
D.old.songid = -1;
}
/******************** Song ingo retrival ************************************/
static int getSong(void) {
mpd_Status *status;
mpd_InfoEntity *info;
/* Get status */
mpd_sendStatusCommand(D.conn);
if (error()) return 0;
status = mpd_getStatus(D.conn);
if (error()) return 0;
pdie_on(!status, "get status");
mpd_nextListOkCommand(D.conn);
if (error()) {
mpd_freeStatus(status);
return 0;
}
/* Copy status */
D.cur.state = status->state;
D.cur.songid = status->songid;
D.cur.pos = status->elapsedTime;
D.cur.len = status->totalTime;
mpd_freeStatus(status);
/* Same song, return */
if (D.cur.songid == D.old.songid) {
return 1;
}
if (D.info) {
mpd_freeInfoEntity(D.info);
D.info = 0;
}
/* Get song */
mpd_sendCurrentSongCommand(D.conn);
if (error()) {
return 0;
}
info = mpd_getNextInfoEntity(D.conn);
if (error()) {
return 0;
}
if (!info) {
return
D.cur.state == MPD_STATUS_STATE_PLAY ||
D.cur.state == MPD_STATUS_STATE_PAUSE;
}
if (info->type != MPD_INFO_ENTITY_TYPE_SONG) {
mpd_freeInfoEntity(info);
return 0;
}
D.info = info;
return 1;
}
/******************** Displaying data ***************************************/
static void formatLine(void);
static void calculateHilightPos(void);
static void output(void);
static void display(unsigned secs) {
static int first_time = 1;
do {
int doDisplay = 0;
D.cur.error = D.conn->error;
D.cur.columns = D.width;
#define CHANGED(field) (D.cur.field != D.old.field)
if (first_time || CHANGED(error) || CHANGED(songid)) {
first_time = 0;
formatLine();
doDisplay = 1;
}
doDisplay = doDisplay || CHANGED(columns);
if (doDisplay || CHANGED(pos) || CHANGED(len)) {
calculateHilightPos();
doDisplay = doDisplay || CHANGED(hilightPos);
}
doDisplay = doDisplay || CHANGED(state) || CHANGED(scroll);
#undef CHANGED
D.old = D.cur;
if (doDisplay || D.background) {
output();
}
usleep(1000000);
} while (!done() && --secs);
}
static void calculateHilightPos(void) {
if (!D.cur.error) {
D.cur.hilightPos = D.cur.len
? (wchar_t)D.cur.pos * D.cur.columns / D.cur.len
: (unsigned)0;
}
}
/******************** Outputting data ***************************************/
static unsigned hilightLeft;
static void outs(const wchar_t *str, size_t len) __attribute__((nonnull));
static void outputScrolled(unsigned cols);
static void output(void) {
unsigned cols = D.cur.columns;
wchar_t tmp;
hilightLeft = D.cur.error ? 0 : D.cur.hilightPos;
termBeginLine();
/* State */
if (D.cur.error) {
tmp = '!';
} else {
switch (D.cur.state) {
case MPD_STATUS_STATE_STOP: tmp = L'\u25A0'; break;
case MPD_STATUS_STATE_PLAY: tmp = L'\u25BA'; break;
case MPD_STATUS_STATE_PAUSE: tmp = L' '; break;
default: tmp = L'?'; break;
}
}
outs(&tmp, 1);
if (!--cols) {
goto end;
}
outs((const wchar_t[]){L' '}, 1);
if (!--cols || cols == 1) {
goto end;
}
if (D.line_len < cols) {
outs(D.line, D.line_len);
} else {
outputScrolled(cols);
}
if (hilightLeft && hilightLeft < cols) {
printf("%*s", (int)hilightLeft, "");
termNormal();
}
end:
termEndLine();
}
static void outputScrolled(unsigned cols) {
static const wchar_t separator[7] = L" * * * ";
static const size_t separator_len =
sizeof separator / sizeof *separator;
const size_t scroll = D.cur.scroll;
if (scroll < D.line_len) {
unsigned len = D.line_len - D.cur.scroll;
if (len >= cols) {
len = cols - 1;
}
outs(D.line + scroll, len);
cols -= len;
}
if (cols != 1) {
unsigned skip = 0, len = separator_len;
if (scroll > D.line_len) {
skip = D.cur.scroll - D.line_len;
len -= skip;
}
if (len >= cols) {
len = cols - 1;
}
outs(separator + skip, len);
cols -= len;
}
if (cols != 1) {
outs(D.line, cols - 1);
cols = 1;
}
D.cur.scroll = (scroll + 1) % (D.line_len + separator_len);
}
static void _outs(const wchar_t *str, size_t len) __attribute__((nonnull));
static void outs(const wchar_t *str, size_t len) {
if (hilightLeft && len >= hilightLeft) {
_outs(str, hilightLeft);
len -= hilightLeft;
str += hilightLeft;
hilightLeft = 0;
termNormal();
}
if (len) {
_outs(str, len);
hilightLeft -= len;
}
}
/******************** Formatting line ***************************************/
static void ensureCapacity(size_t capacity);
static size_t appendUTF(size_t offset, const char *str, size_t len)
__attribute__((nonnull));
static size_t appendUTFStr(size_t offset, const char *str)
__attribute__((nonnull));
static size_t appendW(size_t offset, const wchar_t *str, size_t len)
__attribute__((nonnull));
static size_t doFormat(const wchar_t *p, size_t offset, const wchar_t **last)
__attribute__((nonnull(1)));
static void formatLine(void) {
if (D.cur.error) {
appendW(0, L"[", 1);
D.line_len = appendW(appendUTFStr(1, D.conn->errorStr), L"]", 1);
} else if (!D.info) {
D.line_len = appendW(0, L"[no song]", 10);
} else {
D.line_len = doFormat(D.format, 0, 0);
}
}
static const wchar_t *skipBraces(const wchar_t *p) {
unsigned stack = 1;
for(;; ++p) {
switch (*p) {
case L'[':
++stack;
break;
case L']':
--stack;
if (!stack == 0) {
return p;
}
break;
case 0:
return p;
}
}
}
static const wchar_t *skipFormatting(const wchar_t *p) {
for (;; ++p) {
switch (*p) {
case L'[':
p = skipBraces(p);
if (!*p) {
return p;
}
break;
case L'#':
if (p[1]) {
++p;
}
break;
case L']':
++p;
/* FALL THROUGH */
case L'&':
case L'|':
case 0:
return p;
}
}
}
static size_t doFormatTag(const wchar_t *p, size_t off, const wchar_t **last) {
const mpd_Song *const song = D.info->info.song;
const wchar_t *const name = p;
const char *value;
size_t len;
/* Tag */
while (*p && *p != L'%') {
++p;
}
len = p - name;
if (last) {
*last = *p ? p + 1 : p;
}
#define EQ(str) \
((len == sizeof #str - 1) && \
!memcmp(L"" #str, name, (sizeof #str - 1) * sizeof *name))
value = 0;
if (EQ(Y)) return off - 1; /* special case */
else if (EQ(artist )) value = song->artist;
else if (EQ(title )) value = song->title;
else if (EQ(album )) value = song->album;
else if (EQ(track )) value = song->track;
else if (EQ(path )) value = song->file;
else if (EQ(name )) value = song->name;
else if (EQ(date )) value = song->date;
else if (EQ(genre )) value = song->genre;
else if (EQ(composer)) value = song->composer;
else if (EQ(disc )) value = song->disc;
else if (EQ(comment )) value = song->comment;
else if (EQ(time )) {
if (song->time != MPD_SONG_NO_TIME) {
static char buffer[16];
snprintf(buffer, sizeof buffer, "%2d:%02d",
song->time / 60, song->time % 60);
value = buffer;
}
} else if (!song->file) {
/* nop */
} else if (EQ(file )) {
value = strrchr(song->file, '/');
value = value ? value + 1 : song->file;
} else if (EQ(filenoext) || EQ(pathnoext)) {
char *dot;
value = strchr(song->file, '/');
value = value ? value + 1 : song->file;
dot = strchr(value, '.');
value = *name == L'p' ? song->file : value;
if (dot) {
return appendUTF(off, value, dot - value);
}
} else if (EQ(dir)) {
value = strrchr(song->file, '/');
return value ? appendUTF(off, song->file, value - song->file) : off;
}
#undef EQ
return value ? appendUTFStr(off, value) : off;
}
static size_t doFormat(const wchar_t *p, size_t offset, const wchar_t **last) {
size_t off = offset;
int found = 0;
for(;;) {
switch (*p) {
case 0 : /* NUL */
if (last) {
*last = p;
}
return off;
case L'#': /* Escape */
if (*++p) {
off = appendW(off, p, 1);
}
++p;
break;
case L'|': /* OR */
if (!found) {
++p;
off = offset;
} else {
p = skipFormatting(p + 1);
}
break;
case L'&': /* AND */
if (!found) {
p = skipFormatting(p + 1);
} else {
++p;
found = 0;
}
break;
case L'[': { /* Open group */
size_t o = doFormat(p + 1, off, &p);
found = found || o != off;
off = o;
}
break;
case L']': /* Close group */
if (last) {
*last = p + 1;
}
return found ? off : offset;
case L'%': { /* Tag */
size_t o = doFormatTag(p + 1, off, &p);
found = found || o != off;
off = o + 1 == off /* special case */ ? off : o;
}
break;
default : { /* Copy variable chars */
const wchar_t *ch = p;
while (*++p && !wcschr(L"#%|&[]", *p)) { /* nop */ }
off = appendW(off, ch, p - ch);
}
break;
}
}
}
static void ensureCapacity(size_t capacity)
{
size_t c = D.line_capacity;
if (c >= capacity) {
return;
}
/* Check for overflow */
die_on(capacity * (size_t)2 < capacity
|| capacity * sizeof *D.line < capacity
|| capacity * (size_t)2 * sizeof *D.line < capacity,
"requested too much memory: %zu", capacity);
if (!c) {
c = 32;
}
while (c < capacity) {
c *= 2;
}
/* Don't care about loosing track of memory if realloc(3) fails,
* we're going to die anyways. */
D.line = realloc(D.line, c * sizeof *D.line);
pdie_on(!D.line, "malloc");
D.line_capacity = c;
}
static size_t appendUTFStr(size_t offset, const char *str) {
return appendUTF(offset, str, strlen(str));
}
static size_t appendW(size_t offset, const wchar_t *str, size_t len)
{
ensureCapacity(offset + len);
memcpy(D.line + offset, str, len * sizeof *str);
return offset + len;
}
/******************** Terminal handling **************************************/
static void termDone(void) {
/* Show cursor */
if (!D.background) {
puts("\33[?25h");
}
/* Reset colors */
puts("\33[0m\n");
}
static void termInit(void) {
atexit(termDone);
if (!D.background) {
/* Hide cursor */
fputs("\33[?25l", stdout);
}
}
static void termBeginLine(void) {
/* Begining of line */
if (D.background) {
fputs("\0337\33[1;1f\r", stdout);
} else {
putchar('\r');
}
/* Set color */
if (D.cur.error) {
fputs("\33[30;1m", stdout); /* dark grey */
} else if (hilightLeft) {
fputs("\33[37;1;44m", stdout); /* hilighted */
} else {
termNormal(); /* normal */
}
}
static void termNormal(void) {
fputs("\33[0m", stdout); /* normal */
}
static void termEndLine(void) {
/* Clear line */
fputs("\33[0m\33[K\r", stdout);
/* Get back to saved position */
if (D.background) {
fputs("\0338", stdout);
}
/* and flush */
fflush(stdout);
}
/******************** Misc **************************************************/
static void _die(int perr, const char *fmt, ...)
{
fputs(argv0, stderr);
if (fmt) {
va_list ap;
va_start(ap, fmt);
fputs(": ", stderr);
vfprintf(stderr, fmt, ap);
va_end(ap);
}
if (perr) {
fprintf(stderr, ": %s", strerror(errno));
}
putc('\n', stderr);
exit(1);
}
/******************** Character encoding stuff ******************************/
#if HAVE_ICONV
static iconv_t iconv_utf2wchar = (iconv_t)-1;
static iconv_t iconv_str2wchar = (iconv_t)-1;
static iconv_t iconv_wchar2str = (iconv_t)-1;
static void initIconv(void);
static int iconvDo(iconv_t cd, char *in, size_t inleft, size_t chsize,
void (*outFunc)(const char *buf, size_t len, void *data),
void *data);
#else
# ifndef __STDC_ISO_10646__
# error Unsupported wchar_t encoding, requires ISO 10646 (Unicode)
# endif
#define initIconv() do ; while (0)
#define iconvDo(cd, in, inleft, chsize, outFunc, data) 0
#endif
static void initCodesets(void) {
setlocale(LC_CTYPE, "");
initIconv();
}
#if HAVE_ICONV
static void initIconv(void) {
static const char *const wchar_codes[] = {
"WCHAR_T//TRANSLIT", "WCHAR_T//IGNORE", "WCHAR_T", 0
};
static const char *const code_suffix[] = {
"//TRANSLIT", "//IGNORE", "", 0
};
const char *const *it;
const char *codeset;
char *buffer;
size_t len;
/* UTF-8 -> wchar_t */