Setting of custom locale in tztime configuration. (#168)

To be able to show my birth country's time zone in that country's locale, and my local time in my current locale.

i3status.c

@@ -385,6 +385,7 @@ int main(int argc, char *argv[]) {
     cfg_opt_t tztime_opts[] = {
         CFG_STR("format", "%Y-%m-%d %H:%M:%S %Z", CFGF_NONE),
         CFG_STR("timezone", "", CFGF_NONE),
+        CFG_STR("locale", "", CFGF_NONE),
         CFG_STR("format_time", NULL, CFGF_NONE),
         CFG_CUSTOM_ALIGN_OPT,
         CFG_CUSTOM_MIN_WIDTH_OPT,
@@ -694,13 +695,13 @@ int main(int argc, char *argv[]) {
 
             CASE_SEC("time") {
                 SEC_OPEN_MAP("time");
-                print_time(json_gen, buffer, NULL, cfg_getstr(sec, "format"), NULL, NULL, tv.tv_sec);
+                print_time(json_gen, buffer, NULL, cfg_getstr(sec, "format"), NULL, NULL, NULL, tv.tv_sec);
                 SEC_CLOSE_MAP;
             }
 
             CASE_SEC_TITLE("tztime") {
                 SEC_OPEN_MAP("tztime");
-                print_time(json_gen, buffer, title, cfg_getstr(sec, "format"), cfg_getstr(sec, "timezone"), cfg_getstr(sec, "format_time"), tv.tv_sec);
+                print_time(json_gen, buffer, title, cfg_getstr(sec, "format"), cfg_getstr(sec, "timezone"), cfg_getstr(sec, "locale"), cfg_getstr(sec, "format_time"), tv.tv_sec);
                 SEC_CLOSE_MAP;
             }
 

include/i3status.h

@@ -207,7 +207,7 @@ const char *first_eth_interface(const net_type_t type);
 void print_ipv6_info(yajl_gen json_gen, char *buffer, const char *format_up, const char *format_down);
 void print_disk_info(yajl_gen json_gen, char *buffer, const char *path, const char *format, const char *format_not_mounted, const char *prefix_type, const char *threshold_type, const double low_threshold);
 void print_battery_info(yajl_gen json_gen, char *buffer, int number, const char *path, const char *format, const char *format_down, const char *status_chr, const char *status_bat, const char *status_unk, const char *status_full, int low_threshold, char *threshold_type, bool last_full_capacity, bool integer_battery_capacity, bool hide_seconds);
-void print_time(yajl_gen json_gen, char *buffer, const char *title, const char *format, const char *tz, const char *format_time, time_t t);
+void print_time(yajl_gen json_gen, char *buffer, const char *title, const char *format, const char *tz, const char *locale, const char *format_time, time_t t);
 void print_ddate(yajl_gen json_gen, char *buffer, const char *format, time_t t);
 const char *get_ip_addr(const char *interface);
 void print_wireless_info(yajl_gen json_gen, char *buffer, const char *interface, const char *format_up, const char *format_down);

man/i3status.man

@@ -439,6 +439,7 @@ The system's timezone database is usually installed in +/usr/share/zoneinfo+.
 Files below that path make for valid timezone strings, e.g. for
 +/usr/share/zoneinfo/Europe/Berlin+ you can set timezone to +Europe/Berlin+
 in the +tztime+ module.
+To override the locale settings of your environment, set the +locale+ option.
 
 *Example order*: +tztime berlin+
 
@@ -446,6 +447,8 @@ in the +tztime+ module.
 
 *Example timezone*: +Europe/Berlin+
 
+*Example locale*: +de_DE.UTF-8+
+
 If you would like to use markup in this section, there is a separate
 +format_time+ option that is automatically escaped. Its output then replaces
 %time in the format string.

src/print_time.c

@@ -3,6 +3,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdbool.h>
+#include <locale.h>
 #include <yajl/yajl_gen.h>
 #include <yajl/yajl_version.h>
 
@@ -33,7 +34,7 @@ void set_timezone(const char *tz) {
     }
 }
 
-void print_time(yajl_gen json_gen, char *buffer, const char *title, const char *format, const char *tz, const char *format_time, time_t t) {
+void print_time(yajl_gen json_gen, char *buffer, const char *title, const char *format, const char *tz, const char *locale, const char *format_time, time_t t) {
     const char *walk;
     char *outwalk = buffer;
     struct tm tm;
@@ -45,6 +46,10 @@ void print_time(yajl_gen json_gen, char *buffer, const char *title, const char *
     set_timezone(tz);
     localtime_r(&t, &tm);
 
+    if (locale != NULL) {
+        setlocale(LC_ALL, locale);
+    }
+
     if (format_time == NULL) {
         strftime(timebuf, sizeof(timebuf), format, &tm);
         maybe_escape_markup(timebuf, &outwalk);
@@ -63,6 +68,10 @@ void print_time(yajl_gen json_gen, char *buffer, const char *title, const char *
         }
     }
 
+    if (locale != NULL) {
+        setlocale(LC_ALL, "");
+    }
+
     *outwalk = '\0';
     OUTPUT_FULL_TEXT(buffer);
 }