From 089e68bcf40a48a029e7b8cf785731888e3daa0c Mon Sep 17 00:00:00 2001
From: Simon Dassow <simon@fabams.nl>
Date: Sat, 15 Aug 2026 12:35:14 +0200
Subject: [PATCH] Use apm(8) on OpenBSD for charger and battery status

---
 battery_bsd.go     |  4 ++--
 battery_openbsd.go | 48 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 50 insertions(+), 2 deletions(-)
 create mode 100644 battery_openbsd.go

diff --git a/battery_bsd.go b/battery_bsd.go
index 561502c..076d7c1 100644
--- a/battery_bsd.go
+++ b/battery_bsd.go
@@ -1,5 +1,5 @@
-//go:build openbsd || freebsd || netbsd
-// +build openbsd freebsd netbsd
+//go:build freebsd || netbsd
+// +build freebsd netbsd
 
 package dryvers
 
diff --git a/battery_openbsd.go b/battery_openbsd.go
new file mode 100644
index 0000000..a72aa17
--- /dev/null
+++ b/battery_openbsd.go
@@ -0,0 +1,48 @@
+//go:build openbsd
+// +build openbsd
+
+package dryvers
+
+import (
+	"errors"
+	"os/exec"
+)
+
+var errNoApmOutput = errors.New("failed to find apm output")
+
+const apmBin = "/usr/sbin/apm"
+
+func (b *Battery) PluggedIn() (bool, error) {
+	cmd := exec.Command(apmBin, "-a")
+	val, err := cmd.CombinedOutput()
+	if err != nil {
+		return false, err
+	}
+
+	if len(val) == 0 {
+		return false, errNoApmOutput
+	}
+
+	return val[0] == 1, nil
+}
+
+// Get returns the current battery level (between 0 and 1) or
+// an error if there was a problem.
+func (b *Battery) Get() (float64, error) {
+	cmd := exec.Command(apmBin, "-l")
+	val, err := cmd.CombinedOutput()
+	if err != nil {
+		return 0, err
+	}
+
+	if len(val) == 0 {
+		return 0, errNoApmOutput
+	}
+
+	percent := int(val[0])
+	if percent == 0 { // avoid 0/100 below
+		return 0, nil
+	}
+
+	return float64(percent) / 100, nil
+}