[hackers] [slstatus] Port battery_remaining to Linux || Aaron Marcher

[git]

commit f170028527bdccead9a99797b45011d5e76100f1
Author:     Aaron Marcher <m...@drkhsh.at>
AuthorDate: Fri May 18 17:25:09 2018 +0200
Commit:     Aaron Marcher <m...@drkhsh.at>
CommitDate: Fri May 18 17:25:09 2018 +0200

    Port battery_remaining to Linux
    
    Additionally unify the format of battery_state and uptime

diff --git a/README b/README
index 4cb8ca4..ec6a5a3 100644
--- a/README
+++ b/README
@@ -6,7 +6,7 @@ slstatus is a suckless status monitor for window managers that 
use WM_NAME
 
 Features
 --------
-- Battery percentage/state
+- Battery percentage/state/time left
 - CPU usage
 - CPU frequency
 - Custom shell commands
diff --git a/components/battery.c b/components/battery.c
index b05c171..c7c402a 100644
--- a/components/battery.c
+++ b/components/battery.c
@@ -49,8 +49,36 @@
        const char *
        battery_remaining(const char *bat)
        {
-               /* TODO: Implement */
-               return NULL;
+               int charge_now, current_now, m, h;
+               float timeleft;
+               char path[PATH_MAX], state[12];
+
+               snprintf(path, sizeof(path), "%s%s%s", 
"/sys/class/power_supply/",
+                        bat, "/status");
+               if (pscanf(path, "%12s", state) != 1) {
+                       return NULL;
+               }
+
+               if (!strcmp(state, "Discharging")) {
+                       snprintf(path, sizeof(path), "%s%s%s", 
"/sys/class/power_supply/",
+                                        bat, "/charge_now");
+                       if (pscanf(path, "%i", &charge_now) != 1) {
+                               return NULL;
+                       }
+                       snprintf(path, sizeof(path), "%s%s%s", 
"/sys/class/power_supply/",
+                                        bat, "/current_now");
+                       if (pscanf(path, "%i", &current_now) != 1) {
+                               return NULL;
+                       }
+
+                       timeleft = (float)charge_now / (float)current_now;
+                       h = timeleft;
+                       m = (timeleft - (float)h) * 60;
+
+                       return bprintf("%dh %dm", h, m);
+               }
+
+               return "";
        }
 #elif defined(__OpenBSD__)
        #include <fcntl.h>
@@ -122,7 +150,7 @@
 
                if (load_apm_power_info(&apm_info)) {
                        if (apm_info.ac_state != APM_AC_ON) {
-                               return bprintf("%u:%02u", apm_info.minutes_left 
/ 60,
+                               return bprintf("%uh %02um", 
apm_info.minutes_left / 60,
                                               apm_info.minutes_left % 60);
                        } else {
                                return "";