feat: Initial commit

go.mod

@@ -0,0 +1,3 @@
+module git.ddd.rip/ptrcnull/bat-alert
+
+go 1.16

main.go

@@ -0,0 +1,48 @@
+package main
+
+import (
+    "flag"
+    "log"
+    "os"
+    "os/exec"
+    "strconv"
+    "strings"
+    "time"
+)
+
+func notify(msg string) {
+    cmd := exec.Command("notify-send", "-t", "5000", "bat-alert", msg)
+    err := cmd.Run()
+    if err != nil {
+        log.Println(err)
+    }
+}
+
+var targetFlag = flag.Int("target", 15, "when to send the alert")
+
+func main() {
+    flag.Parse()
+    sent := false
+    for {
+        capacity, err := os.ReadFile("/sys/class/power_supply/BAT0/capacity")
+        if err != nil {
+            notify("error: " + err.Error())
+        }
+
+        numCap, err := strconv.Atoi(strings.Trim(string(capacity), "\n"))
+        if err != nil {
+            notify("error: " + err.Error())
+        }
+
+        if numCap < 15 {
+            if !sent {
+                sent = true
+                notify("battery running low!")
+            }
+        } else {
+            sent = false
+        }
+
+        time.Sleep(time.Second * 10)
+    }
+}