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[i3/i3status] / i3status.c
1 /*
2  * vim:ts=8:expandtab
3  *
4  * i3status – Generates a status line for dzen2 or xmobar
5  *
6  * Copyright © 2008-2012 Michael Stapelberg and contributors
7  * Copyright © 2009 Thorsten Toepper <atsutane at freethoughts dot de>
8  * Copyright © 2010 Axel Wagner <mail at merovius dot de>
9  * Copyright © 2010 Fernando Tarlá Cardoso Lemos <fernandotcl at gmail dot com>
10  *
11  * See file LICENSE for license information.
12  *
13  */
14 #include <string.h>
15 #include <stdio.h>
16 #include <stdbool.h>
17 #include <unistd.h>
18 #include <stdlib.h>
19 #include <sys/socket.h>
20 #include <netinet/in.h>
21 #include <getopt.h>
22 #include <signal.h>
23 #include <confuse.h>
24 #include <glob.h>
25 #include <sys/stat.h>
26 #include <sys/types.h>
27 #include <time.h>
28 #include <sys/time.h>
29 #include <locale.h>
30
31 #include <yajl/yajl_gen.h>
32 #include <yajl/yajl_version.h>
33
34 #include "i3status.h"
35
36 #define exit_if_null(pointer, ...) { if (pointer == NULL) die(__VA_ARGS__); }
37
38 #define CFG_COLOR_OPTS(good, degraded, bad) \
39     CFG_STR("color_good", good, CFGF_NONE), \
40     CFG_STR("color_degraded", degraded, CFGF_NONE), \
41     CFG_STR("color_bad", bad, CFGF_NONE)
42
43 #define CFG_CUSTOM_COLOR_OPTS CFG_COLOR_OPTS(NULL, NULL, NULL)
44
45 /* socket file descriptor for general purposes */
46 int general_socket;
47
48 cfg_t *cfg, *cfg_general, *cfg_section;
49
50 /*
51  * Exit upon SIGPIPE because when we have nowhere to write to, gathering
52  * system information is pointless.
53  *
54  */
55 void sigpipe(int signum) {
56         fprintf(stderr, "Received SIGPIPE, exiting\n");
57         exit(1);
58 }
59
60 /*
61  * Checks if the given path exists by calling stat().
62  *
63  */
64 static bool path_exists(const char *path) {
65         struct stat buf;
66         return (stat(path, &buf) == 0);
67 }
68
69 static void *scalloc(size_t size) {
70         void *result = calloc(size, 1);
71         exit_if_null(result, "Error: out of memory (calloc(%zd))\n", size);
72         return result;
73 }
74
75 static char *sstrdup(const char *str) {
76         char *result = strdup(str);
77         exit_if_null(result, "Error: out of memory (strdup())\n");
78         return result;
79 }
80
81
82 /*
83  * Validates a color in "#RRGGBB" format
84  *
85  */
86 static int valid_color(const char *value)
87 {
88         if (strlen(value) != 7) return 0;
89         if (value[0] != '#') return 0;
90         for (int i = 1; i < 7; ++i) {
91                 if (value[i] >= '0' && value[i] <= '9') continue;
92                 if (value[i] >= 'a' && value[i] <= 'f') continue;
93                 if (value[i] >= 'A' && value[i] <= 'F') continue;
94                 return 0;
95         }
96         return 1;
97 }
98
99 /*
100  * This function resolves ~ in pathnames.
101  * It may resolve wildcards in the first part of the path, but if no match
102  * or multiple matches are found, it just returns a copy of path as given.
103  *
104  */
105 static char *resolve_tilde(const char *path) {
106         static glob_t globbuf;
107         char *head, *tail, *result = NULL;
108
109         tail = strchr(path, '/');
110         head = strndup(path, tail ? (size_t)(tail - path) : strlen(path));
111
112         int res = glob(head, GLOB_TILDE, NULL, &globbuf);
113         free(head);
114         /* no match, or many wildcard matches are bad */
115         if (res == GLOB_NOMATCH || globbuf.gl_pathc != 1)
116                 result = sstrdup(path);
117         else if (res != 0) {
118                 die("glob() failed");
119         } else {
120                 head = globbuf.gl_pathv[0];
121                 result = scalloc(strlen(head) + (tail ? strlen(tail) : 0) + 1);
122                 strncpy(result, head, strlen(head));
123                 if (tail)
124                         strncat(result, tail, strlen(tail));
125         }
126         globfree(&globbuf);
127
128         return result;
129 }
130
131 static char *get_config_path(void) {
132         char *xdg_config_home, *xdg_config_dirs, *config_path;
133
134         /* 1: check the traditional path under the home directory */
135         config_path = resolve_tilde("~/.i3status.conf");
136         if (path_exists(config_path))
137                 return config_path;
138
139         /* 2: check for $XDG_CONFIG_HOME/i3status/config */
140         if ((xdg_config_home = getenv("XDG_CONFIG_HOME")) == NULL)
141                 xdg_config_home = "~/.config";
142
143         xdg_config_home = resolve_tilde(xdg_config_home);
144         if (asprintf(&config_path, "%s/i3status/config", xdg_config_home) == -1)
145                 die("asprintf() failed");
146         free(xdg_config_home);
147
148         if (path_exists(config_path))
149                 return config_path;
150         free(config_path);
151
152         /* 3: check the traditional path under /etc */
153         config_path = SYSCONFDIR "/i3status.conf";
154         if (path_exists(config_path))
155             return sstrdup(config_path);
156
157         /* 4: check for $XDG_CONFIG_DIRS/i3status/config */
158         if ((xdg_config_dirs = getenv("XDG_CONFIG_DIRS")) == NULL)
159                 xdg_config_dirs = "/etc/xdg";
160
161         char *buf = strdup(xdg_config_dirs);
162         char *tok = strtok(buf, ":");
163         while (tok != NULL) {
164                 tok = resolve_tilde(tok);
165                 if (asprintf(&config_path, "%s/i3status/config", tok) == -1)
166                         die("asprintf() failed");
167                 free(tok);
168                 if (path_exists(config_path)) {
169                         free(buf);
170                         return config_path;
171                 }
172                 free(config_path);
173                 tok = strtok(NULL, ":");
174         }
175         free(buf);
176
177         die("Unable to find the configuration file (looked at "
178                 "~/.i3status.conf, $XDG_CONFIG_HOME/i3status/config, "
179                 "/etc/i3status.conf and $XDG_CONFIG_DIRS/i3status/config)");
180         return NULL;
181 }
182
183 int main(int argc, char *argv[]) {
184         unsigned int j;
185
186         cfg_opt_t general_opts[] = {
187                 CFG_STR("output_format", "auto", CFGF_NONE),
188                 CFG_BOOL("colors", 1, CFGF_NONE),
189                 CFG_STR("color_separator", "#333333", CFGF_NONE),
190                 CFG_INT("interval", 1, CFGF_NONE),
191                 CFG_COLOR_OPTS("#00FF00", "#FFFF00", "#FF0000"),
192                 CFG_END()
193         };
194
195         cfg_opt_t run_watch_opts[] = {
196                 CFG_STR("pidfile", NULL, CFGF_NONE),
197                 CFG_STR("format", "%title: %status", CFGF_NONE),
198                 CFG_CUSTOM_COLOR_OPTS,
199                 CFG_END()
200         };
201
202         cfg_opt_t wireless_opts[] = {
203                 CFG_STR("format_up", "W: (%quality at %essid, %bitrate) %ip", CFGF_NONE),
204                 CFG_STR("format_down", "W: down", CFGF_NONE),
205                 CFG_CUSTOM_COLOR_OPTS,
206                 CFG_END()
207         };
208
209         cfg_opt_t ethernet_opts[] = {
210                 CFG_STR("format_up", "E: %ip (%speed)", CFGF_NONE),
211                 CFG_STR("format_down", "E: down", CFGF_NONE),
212                 CFG_CUSTOM_COLOR_OPTS,
213                 CFG_END()
214         };
215
216         cfg_opt_t ipv6_opts[] = {
217                 CFG_STR("format_up", "%ip", CFGF_NONE),
218                 CFG_STR("format_down", "no IPv6", CFGF_NONE),
219                 CFG_CUSTOM_COLOR_OPTS,
220                 CFG_END()
221         };
222
223         cfg_opt_t battery_opts[] = {
224                 CFG_STR("format", "%status %percentage %remaining", CFGF_NONE),
225                 CFG_STR("path", "/sys/class/power_supply/BAT%d/uevent", CFGF_NONE),
226                 CFG_INT("low_threshold", 30, CFGF_NONE),
227                 CFG_STR("threshold_type", "time", CFGF_NONE),
228                 CFG_BOOL("last_full_capacity", false, CFGF_NONE),
229                 CFG_END()
230         };
231
232         cfg_opt_t time_opts[] = {
233                 CFG_STR("format", "%d.%m.%Y %H:%M:%S", CFGF_NONE),
234                 CFG_END()
235         };
236
237         cfg_opt_t ddate_opts[] = {
238                 CFG_STR("format", "%{%a, %b %d%}, %Y%N - %H", CFGF_NONE),
239                 CFG_END()
240         };
241
242         cfg_opt_t load_opts[] = {
243                 CFG_STR("format", "%1min %5min %15min", CFGF_NONE),
244                 CFG_END()
245         };
246
247         cfg_opt_t usage_opts[] = {
248                 CFG_STR("format", "%usage", CFGF_NONE),
249                 CFG_END()
250         };
251
252         cfg_opt_t temp_opts[] = {
253                 CFG_STR("format", "%degrees C", CFGF_NONE),
254                 CFG_STR("path", NULL, CFGF_NONE),
255                 CFG_INT("max_threshold", 75, CFGF_NONE),
256                 CFG_END()
257         };
258
259         cfg_opt_t disk_opts[] = {
260                 CFG_STR("format", "%free", CFGF_NONE),
261                 CFG_END()
262         };
263
264         cfg_opt_t volume_opts[] = {
265                 CFG_STR("format", "♪: %volume", CFGF_NONE),
266                 CFG_STR("device", "default", CFGF_NONE),
267                 CFG_STR("mixer", "Master", CFGF_NONE),
268                 CFG_INT("mixer_idx", 0, CFGF_NONE),
269                 CFG_CUSTOM_COLOR_OPTS,
270                 CFG_END()
271         };
272
273         cfg_opt_t opts[] = {
274                 CFG_STR_LIST("order", "{}", CFGF_NONE),
275                 CFG_SEC("general", general_opts, CFGF_NONE),
276                 CFG_SEC("run_watch", run_watch_opts, CFGF_TITLE | CFGF_MULTI),
277                 CFG_SEC("wireless", wireless_opts, CFGF_TITLE | CFGF_MULTI),
278                 CFG_SEC("ethernet", ethernet_opts, CFGF_TITLE | CFGF_MULTI),
279                 CFG_SEC("battery", battery_opts, CFGF_TITLE | CFGF_MULTI),
280                 CFG_SEC("cpu_temperature", temp_opts, CFGF_TITLE | CFGF_MULTI),
281                 CFG_SEC("disk", disk_opts, CFGF_TITLE | CFGF_MULTI),
282                 CFG_SEC("volume", volume_opts, CFGF_TITLE | CFGF_MULTI),
283                 CFG_SEC("ipv6", ipv6_opts, CFGF_NONE),
284                 CFG_SEC("time", time_opts, CFGF_NONE),
285                 CFG_SEC("ddate", ddate_opts, CFGF_NONE),
286                 CFG_SEC("load", load_opts, CFGF_NONE),
287                 CFG_SEC("cpu_usage", usage_opts, CFGF_NONE),
288                 CFG_CUSTOM_COLOR_OPTS,
289                 CFG_END()
290         };
291
292         char *configfile = NULL;
293         int o, option_index = 0;
294         struct option long_options[] = {
295                 {"config", required_argument, 0, 'c'},
296                 {"help", no_argument, 0, 'h'},
297                 {"version", no_argument, 0, 'v'},
298                 {0, 0, 0, 0}
299         };
300
301         struct sigaction action;
302         memset(&action, 0, sizeof(struct sigaction));
303         action.sa_handler = sigpipe;
304         sigaction(SIGPIPE, &action, NULL);
305
306         if (setlocale(LC_ALL, "") == NULL)
307                 die("Could not set locale. Please make sure all your LC_* / LANG settings are correct.");
308
309         while ((o = getopt_long(argc, argv, "c:hv", long_options, &option_index)) != -1)
310                 if ((char)o == 'c')
311                         configfile = optarg;
312                 else if ((char)o == 'h') {
313                         printf("i3status " VERSION " © 2008-2012 Michael Stapelberg and contributors\n"
314                                 "Syntax: %s [-c <configfile>] [-h] [-v]\n", argv[0]);
315                         return 0;
316                 } else if ((char)o == 'v') {
317                         printf("i3status " VERSION " © 2008-2012 Michael Stapelberg and contributors\n");
318                         return 0;
319                 }
320
321
322         if (configfile == NULL)
323                 configfile = get_config_path();
324
325         cfg = cfg_init(opts, CFGF_NOCASE);
326         if (cfg_parse(cfg, configfile) == CFG_PARSE_ERROR)
327                 return EXIT_FAILURE;
328
329         if (cfg_size(cfg, "order") == 0)
330                 die("Your 'order' array is empty. Please fix your config.\n");
331
332         cfg_general = cfg_getsec(cfg, "general");
333         if (cfg_general == NULL)
334                 die("Could not get section \"general\"\n");
335
336         char *output_str = cfg_getstr(cfg_general, "output_format");
337         if (strcasecmp(output_str, "auto") == 0) {
338                 fprintf(stderr, "i3status: trying to auto-detect output_format setting\n");
339                 output_str = auto_detect_format();
340                 if (!output_str) {
341                         output_str = "none";
342                         fprintf(stderr, "i3status: falling back to \"none\"\n");
343                 } else {
344                         fprintf(stderr, "i3status: auto-detected \"%s\"\n", output_str);
345                 }
346         }
347
348         if (strcasecmp(output_str, "dzen2") == 0)
349                 output_format = O_DZEN2;
350         else if (strcasecmp(output_str, "xmobar") == 0)
351                 output_format = O_XMOBAR;
352         else if (strcasecmp(output_str, "i3bar") == 0)
353                 output_format = O_I3BAR;
354         else if (strcasecmp(output_str, "none") == 0)
355                 output_format = O_NONE;
356         else die("Unknown output format: \"%s\"\n", output_str);
357
358         if (!valid_color(cfg_getstr(cfg_general, "color_good"))
359                         || !valid_color(cfg_getstr(cfg_general, "color_degraded"))
360                         || !valid_color(cfg_getstr(cfg_general, "color_bad"))
361                         || !valid_color(cfg_getstr(cfg_general, "color_separator")))
362                die("Bad color format");
363
364 #if YAJL_MAJOR >= 2
365         yajl_gen json_gen = yajl_gen_alloc(NULL);
366 #else
367         yajl_gen json_gen = yajl_gen_alloc(NULL, NULL);
368 #endif
369
370         if (output_format == O_I3BAR) {
371                 /* Initialize the i3bar protocol. See i3/docs/i3bar-protocol
372                  * for details. */
373                 printf("{\"version\":1}\n[\n");
374                 fflush(stdout);
375                 yajl_gen_array_open(json_gen);
376                 yajl_gen_clear(json_gen);
377         }
378
379         if ((general_socket = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
380                 die("Could not create socket\n");
381
382         int interval = cfg_getint(cfg_general, "interval");
383
384         /* One memory page which each plugin can use to buffer output.
385          * Even though it’s unclean, we just assume that the user will not
386          * specify a format string which expands to something longer than 4096
387          * bytes — given that the output of i3status is used to display
388          * information on screen, more than 1024 characters for the full line
389          * (!), not individual plugins, seem very unlikely. */
390         char buffer[4096];
391
392         struct tm tm;
393         while (1) {
394                 struct timeval tv;
395                 gettimeofday(&tv, NULL);
396                 time_t current_time = tv.tv_sec;
397                 struct tm *current_tm = NULL;
398                 if (current_time != (time_t) -1) {
399                         localtime_r(&current_time, &tm);
400                         current_tm = &tm;
401                 }
402                 if (output_format == O_I3BAR)
403                         yajl_gen_array_open(json_gen);
404                 for (j = 0; j < cfg_size(cfg, "order"); j++) {
405                         if (j > 0)
406                                 print_seperator();
407
408                         const char *current = cfg_getnstr(cfg, "order", j);
409
410                         CASE_SEC("ipv6") {
411                                 SEC_OPEN_MAP("ipv6");
412                                 print_ipv6_info(json_gen, buffer, cfg_getstr(sec, "format_up"), cfg_getstr(sec, "format_down"));
413                                 SEC_CLOSE_MAP;
414                         }
415
416                         CASE_SEC_TITLE("wireless") {
417                                 SEC_OPEN_MAP("wireless");
418                                 print_wireless_info(json_gen, buffer, title, cfg_getstr(sec, "format_up"), cfg_getstr(sec, "format_down"));
419                                 SEC_CLOSE_MAP;
420                         }
421
422                         CASE_SEC_TITLE("ethernet") {
423                                 SEC_OPEN_MAP("ethernet");
424                                 print_eth_info(json_gen, buffer, title, cfg_getstr(sec, "format_up"), cfg_getstr(sec, "format_down"));
425                                 SEC_CLOSE_MAP;
426                         }
427
428                         CASE_SEC_TITLE("battery") {
429                                 SEC_OPEN_MAP("battery");
430                                 print_battery_info(json_gen, buffer, atoi(title), cfg_getstr(sec, "path"), cfg_getstr(sec, "format"), cfg_getint(sec, "low_threshold"), cfg_getstr(sec, "threshold_type"), cfg_getbool(sec, "last_full_capacity"));
431                                 SEC_CLOSE_MAP;
432                         }
433
434                         CASE_SEC_TITLE("run_watch") {
435                                 SEC_OPEN_MAP("run_watch");
436                                 print_run_watch(json_gen, buffer, title, cfg_getstr(sec, "pidfile"), cfg_getstr(sec, "format"));
437                                 SEC_CLOSE_MAP;
438                         }
439
440                         CASE_SEC_TITLE("disk") {
441                                 SEC_OPEN_MAP("disk_info");
442                                 print_disk_info(json_gen, buffer, title, cfg_getstr(sec, "format"));
443                                 SEC_CLOSE_MAP;
444                         }
445
446                         CASE_SEC("load") {
447                                 SEC_OPEN_MAP("load");
448                                 print_load(json_gen, buffer, cfg_getstr(sec, "format"));
449                                 SEC_CLOSE_MAP;
450                         }
451
452                         CASE_SEC("time") {
453                                 SEC_OPEN_MAP("time");
454                                 print_time(json_gen, buffer, cfg_getstr(sec, "format"), current_tm);
455                                 SEC_CLOSE_MAP;
456                         }
457
458                         CASE_SEC("ddate") {
459                                 SEC_OPEN_MAP("ddate");
460                                 print_ddate(json_gen, buffer, cfg_getstr(sec, "format"), current_tm);
461                                 SEC_CLOSE_MAP;
462                         }
463
464                         CASE_SEC_TITLE("volume") {
465                                 SEC_OPEN_MAP("volume");
466                                 print_volume(json_gen, buffer, cfg_getstr(sec, "format"),
467                                              cfg_getstr(sec, "device"),
468                                              cfg_getstr(sec, "mixer"),
469                                              cfg_getint(sec, "mixer_idx"));
470                                 SEC_CLOSE_MAP;
471                         }
472
473                         CASE_SEC_TITLE("cpu_temperature") {
474                                 SEC_OPEN_MAP("cpu_temperature");
475                                 print_cpu_temperature_info(json_gen, buffer, atoi(title), cfg_getstr(sec, "path"), cfg_getstr(sec, "format"), cfg_getint(sec, "max_threshold"));
476                                 SEC_CLOSE_MAP;
477                         }
478
479                         CASE_SEC("cpu_usage") {
480                                 SEC_OPEN_MAP("cpu_usage");
481                                 print_cpu_usage(json_gen, buffer, cfg_getstr(sec, "format"));
482                                 SEC_CLOSE_MAP;
483                         }
484                 }
485                 if (output_format == O_I3BAR) {
486                         yajl_gen_array_close(json_gen);
487                         const unsigned char *buf;
488 #if YAJL_MAJOR >= 2
489                         size_t len;
490 #else
491                         unsigned int len;
492 #endif
493                         yajl_gen_get_buf(json_gen, &buf, &len);
494                         write(STDOUT_FILENO, buf, len);
495                         yajl_gen_clear(json_gen);
496                 }
497
498                 printf("\n");
499                 fflush(stdout);
500
501                 /* To provide updates on every full second (as good as possible)
502                  * we don’t use sleep(interval) but we sleep until the next
503                  * second (with microsecond precision) plus (interval-1)
504                  * seconds. */
505                 struct timeval current_timeval;
506                 gettimeofday(&current_timeval, NULL);
507                 struct timespec ts = {interval - 1, (10e5 - current_timeval.tv_usec) * 1000};
508                 nanosleep(&ts, NULL);
509         }
510 }