Add CPU usage color thresholds

CPU usage had previously not supported the color option.  Add support
for a "degraded" state above which the degraded color is used, and a
higher "bad" state above which the "bad" color is used.  One possible
use for these might be indicating whether one or all cores are
saturated.

Unlike the color settings for other, these are set high enough to be
disabled by default.  This is done because i3status determines CPU
usage over only the last display interval, which means that, a user
with a low refresh rate might see frequent, potentially-annoying color
changes.

1 files changed, 13 insertions, 1 deletions

diff --git a/src/print_cpu_usage.c b/src/print_cpu_usage.c
index adf2d04..1753cf5 100644
--- a/src/print_cpu_usage.c
+++ b/src/print_cpu_usage.c
@@ -41,11 +41,12 @@ static int prev_idle = 0;
  * percentage.
  *
  */
-void print_cpu_usage(yajl_gen json_gen, char *buffer, const char *format) {
+void print_cpu_usage(yajl_gen json_gen, char *buffer, const char *format, const float max_threshold, const float degraded_threshold) {
     const char *walk;
     char *outwalk = buffer;
     int curr_user = 0, curr_nice = 0, curr_system = 0, curr_idle = 0, curr_total;
     int diff_idle, diff_total, diff_usage;
+    bool colorful_output = false;
 
 #if defined(LINUX)
     static char statpath[512];
@@ -101,10 +102,21 @@ void print_cpu_usage(yajl_gen json_gen, char *buffer, const char *format) {
             continue;
         }
 
+        if (diff_usage >= max_threshold) {
+            START_COLOR("color_bad");
+            colorful_output = true;
+        } else if (diff_usage >= degraded_threshold) {
+            START_COLOR("color_degraded");
+            colorful_output = true;
+        }
+
         if (BEGINS_WITH(walk + 1, "usage")) {
             outwalk += sprintf(outwalk, "%02d%s", diff_usage, pct_mark);
             walk += strlen("usage");
         }
+
+        if (colorful_output)
+            END_COLOR;
     }
 
     OUTPUT_FULL_TEXT(buffer);