enabled then disable, only if at least one enabled

src/main.rs

@@ -70,22 +70,29 @@ fn main() {
                     });
                 });
         } else {
-            println!("unknown state, do nothing")
+            println!("unknown state, do nothing");
         }
     }
 
-    // TODO if there are no enables do nothing.
-    outputs.iter()
-        .for_each(|output| {
-            if let SwayOutput::Disabled{name} = output {
-                println!("swaymsg output {} disabled", name);
-            }
-        });
-    outputs.iter()
-        .for_each(|output| {
-            if let SwayOutput::Enabled{name,width,height,x,y} = output {
-                println!("swaymsg output {} enable dpms on mode {}x{} pos {} {}",
-                    name, width, height, x, y);
-            }
-        });
+    let enabled_count = outputs.iter()
+        .filter(|output| matches!(output,SwayOutput::Enabled{name:_,width:_,height:_,x:_,y:_}))
+        .count();
+    if enabled_count >= 1 {
+        // enable then disable
+        outputs.iter()
+            .for_each(|output| {
+                if let SwayOutput::Enabled{name,width,height,x,y} = output {
+                    println!("swaymsg output {} enable dpms on mode {}x{} pos {} {}",
+                             name, width, height, x, y);
+                }
+            });
+        outputs.iter()
+            .for_each(|output| {
+                if let SwayOutput::Disabled{name} = output {
+                    println!("swaymsg output {} disabled", name);
+                }
+            });
+    } else {
+        println!("No enabled outputs, do nothing");
+    }
 }