Print brightness if -b is called without parameter.

README.md

@@ -13,7 +13,7 @@ Switch between presets 1 to 17 or list available presets:
 
 `$ wled -f|-w|-a [1-17|l(ist)]`
 
-Change brightness:
+Display or change brightness:
 
 `$ wled -f|-w|-a -b [1-255]`
 

wled

@@ -33,7 +33,7 @@ commands:
     on|off                  switch on/off
     [1-17]                  switch preset
     l, list                 list presets
-    -b,--brightness [1-255] set brightness
+    -b,--brightness [1-255] get or set brightness
 
 exit status:
     0   no failure
@@ -61,6 +61,12 @@ active_preset() {
         sed -n 's/.*"ps"[[:space:]]*:[[:space:]]*\(1\?[0-9]\).*/\1/p'
 }
 
+current_brightness() {
+    # Find current brightness.
+    curl_fetch "http://$1/json" | \
+        sed -n 's/.*"state"[[:space:]]*:[[:space:]]*{[^}]*"bri"[[:space:]]*:[[:space:]]*\([0-9]\{1,3\}\).*/\1/p'
+}
+
 arg_inst="$1"
 arg_cmnd="$2"
 arg_param="$3"
@@ -107,19 +113,21 @@ for wled_host; do
         ;;
         -b|--brightness) # Set brightness.
             if test -z "$arg_param"; then
-                echo "Error: missing parameter for brightness." >&2
+                # No parameter given. Print current brightness.
-                exit 1
+                echo "Current brightness of $wled_host:"
+                current_brightness "$wled_host"
+            else
+                # Try to convert 3rd parameter to an integer between 1 an 255.
+                bright=$(printf '%u' "$arg_param" 2>/dev/null)
+                if test $? -gt 0; then # Conversion failed.
+                    echo "Error: unable to parse parameter for brightness." >&2
+                    exit 1
+                elif test "$bright" -lt 1 -o "$bright" -gt 255; then
+                    echo "Error: parameter for brightness is out of range." >&2
+                    exit 1
+                fi
+                api_resp=$(curl_send "{'bri':$bright}" "http://$wled_host/json")
             fi
-            # Try to convert 3rd parameter to an integer between 1 an 255.
-            bright=$(printf '%u' "$arg_param" 2>/dev/null)
-            if test $? -gt 0; then # Conversion failed.
-                echo "Error: unable to parse parameter for brightness." >&2
-                exit 1
-            elif test "$bright" -lt 1 -o "$bright" -gt 255; then
-                echo "Error: parameter for brightness is out of range." >&2
-                exit 1
-            fi
-            api_resp=$(curl_send "{'bri':$bright}" "http://$wled_host/json")
         ;;
         [1-9]|1[0-7]) # Switch to preset.
             api_resp=$(curl_send "{'ps':$arg_cmnd}" "http://$wled_host/json")