1 files changed, 56 insertions, 0 deletions
diff --git a/components/battery.c b/components/battery.c
new file mode 100644
index 0000000..f384aab
--- /dev/null
+++ b/components/battery.c
@@ -0,0 +1,56 @@
+/* See LICENSE file for copyright and license details. */
+#include <limits.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "../util.h"
+
+const char *
+battery_perc(const char *bat)
+{
+	int perc;
+	char path[PATH_MAX];
+
+	snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/", bat, "/capacity");
+	return (pscanf(path, "%i", &perc) == 1) ?
+	       bprintf("%d", perc) : NULL;
+}
+
+const char *
+battery_power(const char *bat)
+{
+	int watts;
+	char path[PATH_MAX];
+
+	snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/", bat, "/power_now");
+	return (pscanf(path, "%i", &watts) == 1) ?
+	       bprintf("%d", (watts + 500000) / 1000000) : NULL;
+}
+
+const char *
+battery_state(const char *bat)
+{
+	struct {
+		char *state;
+		char *symbol;
+	} map[] = {
+		{ "Charging",    "+" },
+		{ "Discharging", "-" },
+		{ "Full",        "=" },
+		{ "Unknown",     "/" },
+	};
+	size_t i;
+	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;
+	}
+
+	for (i = 0; i < LEN(map); i++) {
+		if (!strcmp(map[i].state, state)) {
+			break;
+		}
+	}
+	return (i == LEN(map)) ? "?" : map[i].symbol;
+}