1 files changed, 91 insertions, 0 deletions
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..54f93df
--- /dev/null
+++ b/main.c
@@ -0,0 +1,91 @@
+#define _GNU_SOURCE
+#include <sys/sysinfo.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <stdio.h>
+#include <err.h>
+
+static char SYSPATH[] = "/sys/class/power_supply/BAT0/";
+static char charging[] = "↯";
+
+static char *readline(char *dir, char *file)
+{
+	static char 	*line = NULL;
+	static size_t 	nbytes = 0;
+
+	char path[512];
+	ssize_t n;
+	FILE *fp;
+
+	if (! dir && ! file) {
+		free(line);
+		return line = NULL;
+	}
+
+	snprintf(path, sizeof(path), "%s%s", dir, file);
+
+	if (! (fp = fopen(path, "r"))) {
+		warn("fopen %s", path);
+		_exit(1);
+	}
+
+	if ((n = getline(&line, &nbytes, fp)) < 0) {
+		warn("getline");
+		_exit(1);
+	}
+
+	fclose(fp);
+
+	assert(line);
+
+	if (n && line[n - 1] == '\n')
+		line[n - 1] = '\0';
+
+	return line;
+}
+
+static void print_battery_status(void)
+{
+#define PRINT(...) str += snprintf(str, sizeof(status) - (str - status), __VA_ARGS__)
+
+	static char status[512];
+
+	char *str = status;
+
+	if (! strcasecmp("charging", readline(SYSPATH, "status")))
+		PRINT("%s ", charging);
+
+	int capacity = atoi(readline(SYSPATH, "capacity"));
+
+	if (capacity == 100)
+		PRINT("full");
+	else
+		PRINT("%d%%", capacity);
+
+	printf(", bat: %s", status);
+
+	readline(NULL, NULL);
+}
+
+int main(int argc, char *argv[])
+{
+	struct sysinfo si;
+
+	if (sysinfo(&si) < 0)
+		return 1;
+
+	printf("used: %ld", (si.totalram - si.freeram) * si.mem_unit >> 20);
+	printf(", free: %ld", si.freeram * si.mem_unit >> 20);
+#if 0
+	printf(", swap: %d", (si.totalswap - si.freeswap) * si.mem_unit >> 10);
+#endif
+	printf(", procs: %d", si.procs);
+
+	print_battery_status();
+
+	printf("\n");
+
+	return 0;
+}