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batteryd.c
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batteryd.c
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/* gcc -O2 `pkg-config --cflags --libs libnotify` -o battery-notify battery.c */
#define _GNU_SOURCE
#include <ctype.h>
#include <libnotify/notify.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
static float battery_energy_now()
{
size_t len = 0;
char *line = NULL;
long energy_now = -1;
char energy_now_path[] = "/sys/class/power_supply/BAT0/energy_now";
FILE *BAT_energy_now_fp = NULL;
long energy_full = -1;
char energy_full_path[] = "/sys/class/power_supply/BAT0/energy_full";
FILE *BAT_energy_full_fp = NULL;
BAT_energy_now_fp = fopen(energy_now_path, "r");
if (BAT_energy_now_fp == NULL) {
fprintf(stderr, "Not able to open \"%s\"\n", energy_now_path);
return 0.0;
}
if (getline(&line, &len, BAT_energy_now_fp) != -1) {
sscanf(line, "%ld ", &energy_now);
free(line);
}
fclose(BAT_energy_now_fp);
if (energy_now == -1)
return -1.0;
BAT_energy_full_fp = fopen(energy_full_path, "r");
if (BAT_energy_full_fp == NULL) {
fprintf(stderr, "Not able to open \"%s\"\n", energy_full_path);
return 0.0;
}
line = NULL;
len = 0;
if (getline(&line, &len, BAT_energy_full_fp) != -1) {
sscanf(line, "%ld ", &energy_full);
free(line);
}
fclose(BAT_energy_full_fp);
if (energy_full == -1)
return -1.0;
if (energy_full != 0)
return (double)(100 * energy_now) / (double)energy_full;
return 0.0;
}
static void battery_notify(const float charge, const char *const status)
{
if (!status)
return;
const float min = 60.0f;
const float max = 99.5f;
/* reminder that `strcmp` returns `0` when both strings are equal */
if ((charge > min && charge < max) ||
(charge > max && strcmp(status, "Discharging") == 0) ||
(charge < min && strcmp(status, "Charging") == 0))
return;
if (!notify_init("Battery"))
return;
char *icon = NULL;
char *summary = NULL;
char *message = NULL;
if (charge > max) {
icon =
"file:///usr/share/icons/la-capitaine/status/scalable-dark/"
"battery-full-charged.svg";
summary = "Battery full";
message = "Disconnect power cord";
}
else if (charge < min) {
icon =
"file:///usr/share/icons/la-capitaine/status/scalable-dark/"
"battery-good.svg";
summary = "Battery discharging";
message = "Connect power cord";
}
NotifyNotification *notification =
notify_notification_new(summary, message, icon);
if (notification) {
/* NOTIFY_URGENCY_LOW, NOTIFY_URGENCY_NORMAL, NOTIFY_URGENCY_CRITICAL */
notify_notification_set_urgency(notification, NOTIFY_URGENCY_CRITICAL);
notify_notification_show(notification, NULL);
g_object_unref(G_OBJECT(notification));
}
notify_uninit();
}
static char *battery_status()
{
size_t len = 0;
char *line = NULL;
char status_path[] = "/sys/class/power_supply/BAT0/status";
FILE *BAT_status_fp = NULL;
BAT_status_fp = fopen(status_path, "r");
if (!BAT_status_fp) {
fprintf(stderr, "Not able to open \"%s\"\n", status_path);
return NULL;
}
if (getline(&line, &len, BAT_status_fp) != -1) {
for (unsigned long i = 0; i < len; ++i)
if (!isalpha(line[i])) {
line[i] = '\0';
break;
}
}
fclose(BAT_status_fp);
return line;
}
int main()
{
char *status;
float charge;
while (true) {
charge = battery_energy_now();
status = battery_status();
battery_notify(charge, status);
free(status);
sleep(60);
}
return 0;
}