Read before writing smc

This reverts commit 4ced07c359.

cbattery

@@ -9,6 +9,7 @@ PATH="/usr/bin:/usr/local/bin:/usr/sbin:/opt/homebrew/bin:/opt/homebrew/sbin:/op
 usage() {
     cat << EOF
 usage: ${0##*/} [command]
+
     charging [on|off]		- Toggle charging
     adapter [on|off]		- Toggle adapter connection
     status			- Get status information
@@ -26,24 +27,31 @@ read_cache() {
     cat "$TMP_FILE" 2> /dev/null
 }
 
+log_message() {
+    timestamp=$(date "+%b %d %H:%M:%S")
+    echo "$timestamp - $1"
+}
+
 enable_discharging() {
-    echo "Enabling battery discharging"
+    log_message "Enabling battery discharging"
     sudo smc -k CH0I -w 01
 }
 
 disable_discharging() {
-    echo "Disabling battery discharging"
+    log_message "Disabling battery discharging"
     sudo smc -k CH0I -w 00
 }
 
 enable_charging() {
-    echo "Enabling battery charging"
+    [[ "$(get_smc_charging_hex)" == "00" ]] && return
+    log_message "Enabling battery charging"
     sudo smc -k CH0B -w 00
     sudo smc -k CH0C -w 00
 }
 
 disable_charging() {
-    echo "Disabling battery charging"
+    [[ "$(get_smc_charging_hex)" != "00" ]] && return
+    log_message "Disabling battery charging"
     sudo smc -k CH0B -w 02
     sudo smc -k CH0C -w 02
 }
@@ -117,7 +125,7 @@ runScript() {
 	    [[ -f "$launch_daemon" ]] && sudo launchctl unload -w "$launch_daemon"
             ;;
         "charging")
-            echo "Setting $action to $setting"
+            log_message "Setting $action to $setting"
             case "$setting" in
                 "on") enable_charging && write_cache "enabled" ;;
                 "off") disable_charging && write_cache "disabled" ;;
@@ -125,7 +133,7 @@ runScript() {
             esac
             ;;
         "adapter")
-            echo "Setting $action to $setting"
+            log_message "Setting $action to $setting"
             case "$setting" in
                 "on") enable_discharging ;;
                 "off") disable_discharging ;;
@@ -135,7 +143,7 @@ runScript() {
         "status")
             case "$setting" in
                 "charging") exit "$(get_smc_charging_hex)" ;;
-                "cache") "$(get_cached_status)" ;;
+                "cache") get_cached_status ;;
                 *) echo "Battery at $(get_battery_percentage)%, smc charging $(get_smc_charging_status)" ;;
             esac
             ;;