scripts: split policy-hooks into separate files, one for each hook

src/scripts/policy-desktop/find-default-target.lua

@@ -0,0 +1,63 @@
+-- WirePlumber
+--
+-- Copyright © 2022 Collabora Ltd.
+--
+-- SPDX-License-Identifier: MIT
+--
+-- Check if default nodes can be picked up as target node.
+
+local putils = require ("policy-utils")
+
+SimpleEventHook {
+  name = "find-default-target@policy-desktop",
+  type = "on-event",
+  priority = HookPriority.NORMAL,
+  interests = {
+    EventInterest {
+      Constraint { "event.type", "=", "find-target-si-and-link" },
+    },
+  },
+  execute = function (event)
+    local si = event:get_subject ()
+    local si_id = si.id
+    local si_flags = putils.get_flags (si_id)
+    local si_target = si_flags.si_target
+
+    if si_target or (default_nodes == nil) then
+      -- bypass the hook as the target is already picked up.
+      return
+    end
+
+    local si_props = si.properties
+    local target_picked = false
+
+    Log.info (si, string.format ("handling item: %s (%s) si id(%s)",
+      tostring (si_props ["node.name"]), tostring (si_props ["node.id"]), si_id))
+
+    local si_target = putils.findDefaultLinkable (si)
+
+    local can_passthrough, passthrough_compatible
+    if si_target then
+      passthrough_compatible, can_passthrough =
+      putils.checkPassthroughCompatibility (si, si_target)
+      if putils.canLink (si_props, si_target) and passthrough_compatible then
+        target_picked = true;
+      end
+    end
+
+    if target_picked then
+      Log.info (si,
+        string.format ("... default target picked: %s (%s), can_passthrough:%s",
+          tostring (si_target.properties ["node.name"]),
+          tostring (si_target.properties ["node.id"]),
+          tostring (can_passthrough)))
+      si_flags.si_target = si_target
+      si_flags.can_passthrough = can_passthrough
+    else
+      si_flags.si_target = nil
+      si_flags.can_passthrough = nil
+    end
+
+    putils.set_flags (si_id, si_flags)
+  end
+}:register ()