Add colorized output for load avg

i3status.c

@@ -257,6 +257,8 @@ int main(int argc, char *argv[]) {
 
         cfg_opt_t load_opts[] = {
                 CFG_STR("format", "%1min %5min %15min", CFGF_NONE),
+                CFG_INT("max_threshold", 5, CFGF_NONE),
+                CFG_CUSTOM_COLOR_OPTS,
                 CFG_END()
         };
 
@@ -460,7 +462,7 @@ int main(int argc, char *argv[]) {
 
                         CASE_SEC("load") {
                                 SEC_OPEN_MAP("load");
-                                print_load(json_gen, buffer, cfg_getstr(sec, "format"));
+                                print_load(json_gen, buffer, cfg_getstr(sec, "format"), cfg_getint(sec, "max_threshold"));
                                 SEC_CLOSE_MAP;
                         }
 

include/i3status.h

@@ -151,7 +151,7 @@ void print_run_watch(yajl_gen json_gen, char *buffer, const char *title, const c
 void print_cpu_temperature_info(yajl_gen json_gen, char *buffer, int zone, const char *path, const char *format, int);
 void print_cpu_usage(yajl_gen json_gen, char *buffer, const char *format);
 void print_eth_info(yajl_gen json_gen, char *buffer, const char *interface, const char *format_up, const char *format_down);
-void print_load(yajl_gen json_gen, char *buffer, const char *format);
+void print_load(yajl_gen json_gen, char *buffer, const char *format, const int max_threshold);
 void print_volume(yajl_gen json_gen, char *buffer, const char *fmt, const char *device, const char *mixer, int mixer_idx);
 bool process_runs(const char *path);
 

man/i3status.man

@@ -259,12 +259,16 @@ Gets the percentual CPU usage from +/proc/stat+ (Linux) or +sysctl(3)+ (FreeBSD/
 === Load
 
 Gets the system load (number of processes waiting for CPU time in the last
-1, 5 and 15 minutes).
+1, 5 and 15 minutes). It is possible to define a max_threshold that will
+color the load value red in case the load average of the last minute is
+getting higher than the configured threshold. Defaults to 5.
 
 *Example order*: +load+
 
 *Example format*: +%1min %5min %15min+
 
+*Example max_threshold*: 5
+
 === Time
 
 Outputs the current time in the local timezone.

src/print_load.c

@@ -6,13 +6,14 @@
 #include <yajl/yajl_gen.h>
 #include <yajl/yajl_version.h>
 
-void print_load(yajl_gen json_gen, char *buffer, const char *format) {
+void print_load(yajl_gen json_gen, char *buffer, const char *format, const int max_threshold) {
         char *outwalk = buffer;
         /* Get load */
 
 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(linux) || defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__) || defined(sun) || defined(__DragonFly__)
         double loadavg[3];
         const char *walk;
+        bool colorful_output = false;
 
         if (getloadavg(loadavg, 3) == -1)
                 goto error;
@@ -22,6 +23,10 @@ void print_load(yajl_gen json_gen, char *buffer, const char *format) {
                         *(outwalk++) = *walk;
                         continue;
                 }
+                if (loadavg[0] >= max_threshold) {
+                        START_COLOR("color_bad");
+                        colorful_output = true;
+                }
 
                 if (BEGINS_WITH(walk+1, "1min")) {
                         outwalk += sprintf(outwalk, "%1.2f", loadavg[0]);
@@ -37,6 +42,8 @@ void print_load(yajl_gen json_gen, char *buffer, const char *format) {
                         outwalk += sprintf(outwalk, "%1.2f", loadavg[2]);
                         walk += strlen("15min");
                 }
+                if (colorful_output)
+                        END_COLOR;
         }
 
         *outwalk = '\0';