initial

1 files changed, 58 insertions, 0 deletions

diff --git a/go.sh b/go.sh
new file mode 100755
index 0000000..686127f
--- /dev/null
+++ b/go.sh
@@ -0,0 +1,58 @@
+#!/bin/sh
+capacity_threshold=90
+
+battery_dir=/sys/class/power_supply/BAT0
+status_file=$battery_dir/status
+capacity_file=$battery_dir/capacity
+
+UNIT=powerloss-handler
+CMD=$0
+
+self_install()
+{
+    systemctl --user reset-failed "$UNIT" 2>/dev/null
+    systemd-run --user \
+                --unit "$UNIT" \
+                --property Restart="on-failure" \
+                -- "$CMD"
+}
+
+go()
+{
+
+    read capacity < "$capacity_file" || return
+    case "$capacity" in
+        '' | *[^0-9]*)
+            echo "Error: unexpected value for battery capacity: $capacity" >&2
+            return 1 ;;
+    esac
+
+    if [ -t 2 ]
+    then
+        printf '  %.2d%%  \r' "$capacity" >&2
+    fi
+
+    read status < "$status_file" || return
+    [ "$status" = Discharging ] || return 0
+
+    if [ "$capacity" -lt "$capacity_threshold" ]
+    then
+        systemctl suspend
+    fi
+}
+
+main()
+{
+    while true
+    do
+        go
+        sleep 1
+    done
+}
+
+if [ "$1" = install ]
+then
+    self_install
+else
+    main
+fi