sane-input-handler: activate media controls when inside a fullscreen app

hosts/common/programs/sane-input-handler/sane-input-handler

@@ -194,6 +194,46 @@ func swayGetOutput () {
   return (num_power_false === 0)
 }
 
+# crawls the `swaymsg -t get_tree` output recursively, to return all window objects
+func swayWindowsFromTree (root) {
+  var windows = []
+  for node in (root.nodes) {
+    for w in (swayWindowsFromTree (node)) {
+      call windows->append(w)
+    }
+  }
+
+  if (root.type === "con") {
+    # windows are identified, perhaps, by type = "con" or app_id = *
+    call windows->append(root)
+  }
+
+  return (windows)
+}
+
+# returns a json object representing the currently focused window
+func swayGetFocusedWindow () {
+  var nodes = null;
+  swaymsg -t get_tree --raw | json read (&nodes)
+
+  var windows = swayWindowsFromTree (nodes)
+  for w in (windows) {
+    if (w.focused) {
+      return (w)
+    }
+  }
+}
+
+func swayIsFullscreen () {
+  var w = swayGetFocusedWindow()
+  if (not w) {
+    info swayIsFullscreen ("couldn't determine focused window")
+    return (false)
+  }
+  debug "swayIsFullscreen" (w)
+  return (w.fullscreen_mode === 1)
+}
+
 # true if rofi is visible
 func rofiGet () {
   if pidof rofi {
@@ -354,6 +394,12 @@ func mapDefault (action) {
       # power twice => toggle media player
       return ("togglePlayback")
     }
+    / ^ 'volup_hold_' d+ $ / {
+      return ("seekForward")
+    }
+    / ^ 'voldown_hold_' d+ $ / {
+      return ("seekBackward")
+    }
 
     / ^ 'volup_tap_' d+ $ / {
       return ("volumeUp")
@@ -374,12 +420,6 @@ func mapOff (action) {
       # power tap->hold: escape hatch for when bonsaid locks up
       return ("restartBonsai")
     }
-    / ^ 'volup_hold_' d+ $ / {
-      return ("seekForward")
-    }
-    / ^ 'voldown_hold_' d+ $ / {
-      return ("seekBackward")
-    }
   }
 }
 
@@ -431,6 +471,10 @@ func mapOn (action) {
       # swallow, to prevent keyboard from also triggering media controls
       return ("ignore")
     }
+    / ^ 'volup_hold_' d+ $ / {
+      # swallow, to prevent app launcher from also triggering media controls
+      return ("ignore")
+    }
     / ^ 'voldown_hold_' d+ $ / {
       # swallow, to prevent terminal from also triggering media controls
       return ("ignore")
@@ -438,6 +482,23 @@ func mapOn (action) {
   }
 }
 
+func mapFullscreen (action) {
+  case (action) {
+    ("power_tap_1_hold") {
+      # power tap->hold: kill active window
+      return ("killWindow")
+    }
+    ("power_then_volup") {
+      # power (tap) -> volup: rotate CCW
+      return ("rotateCCW")
+    }
+    ("power_then_voldown") {
+      # power (tap) -> voldown: rotate CW
+      return ("rotateCW")
+    }
+  }
+}
+
 func mapInhibited (action) {
   case (action) {
     ("power_tap_1_hold") {
@@ -456,6 +517,8 @@ func mapToplevel (action) {
   if (isAllOn()) {
     if (isInhibited()) {
       setvar mappedTo = traceFunc("mapInhibited", mapInhibited, action)
+    } elif (swayIsFullscreen()) {
+      setvar mappedTo = traceFunc("mapFullscreen", mapFullscreen, action)
     } else {
       setvar mappedTo = traceFunc("mapOn", mapOn, action)
     }