4 files changed, 62 insertions, 0 deletions
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..7dbe7a7
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+minibattery
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..8b44bf8
--- /dev/null
+++ b/README.md
@@ -0,0 +1,4 @@
+# Minibattery
+
+Tiny laptop battery monitoring app, outputs battery state each second. Meant
+to be used with status bar apps like i3-blocks.
diff --git a/build.sh b/build.sh
new file mode 100755
index 0000000..55062ac
--- /dev/null
+++ b/build.sh
@@ -0,0 +1,3 @@
+#!/bin/sh
+
+gcc -O3 minibattery.c -o minibattery
diff --git a/minibattery.c b/minibattery.c
new file mode 100644
index 0000000..c30712c
--- /dev/null
+++ b/minibattery.c
@@ -0,0 +1,54 @@
+#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;
+}