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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define STRLEN_CAPACITY 4
#define STRLEN_STATUS 16
#define COLOR_FULL "#839496"
#define COLOR_LOW "#b58900"
#define COLOR_CRITICAL "#dc322f"
void dump_file(const char *path, size_t size, char *out) {
FILE *file = fopen(path, "r");
fgets(out, size, file);
fclose(file);
}
int main() {
char capacity[STRLEN_CAPACITY];
char status[STRLEN_STATUS];
for (;;) {
dump_file("/sys/class/power_supply/BAT0/capacity", STRLEN_CAPACITY, capacity);
dump_file("/sys/class/power_supply/BAT0/status", STRLEN_STATUS, status);
// select color based on charge level
int capacity_int = atoi(capacity);
const char *color = NULL;
if (capacity_int <= 10) {
color = COLOR_CRITICAL;
} else if (capacity_int <= 20) {
color = COLOR_LOW;
} else {
color = COLOR_FULL;
}
// select icon based on whether AC is plugged in
const char *icon = NULL;
if (strstr(status, "Discharging")) {
icon = "f0079";
} else {
icon = "f06a5";
}
printf("<span color=\"%s\"><span font=\"Symbols Nerd Font\">&#x%s;</span> %d%</span>\n", color, icon, capacity_int);
fflush(stdout);
sleep(1);
}
return 0;
}
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