macos: support drag-and-drop and default file associations (#1822)

* macos: support drag-and-drop and default file associations

* resources/macos: use LSItemContentTypes to narrow down files

* macos: support opening folders

* rootview: workaround macos weird dnd event timing

* core/rootview: rename variable and refactor if statement

data/core/init.lua

@@ -1313,20 +1313,7 @@ function core.on_event(type, ...)
   elseif type == "minimized" or type == "maximized" or type == "restored" then
     core.window_mode = type == "restored" and "normal" or type
   elseif type == "filedropped" then
-    if not core.root_view:on_file_dropped(...) then
-      local filename, mx, my = ...
-      local info = system.get_file_info(filename)
-      if info and info.type == "dir" then
-        system.exec(string.format("%q %q", EXEFILE, filename))
-      else
-        local ok, doc = core.try(core.open_doc, filename)
-        if ok then
-          local node = core.root_view.root_node:get_child_overlapping_point(mx, my)
-          node:set_active_view(node.active_view)
-          core.root_view:open_doc(doc)
-        end
-      end
-    end
+    core.root_view:on_file_dropped(...)
   elseif type == "focuslost" then
     core.root_view:on_focus_lost(...)
   elseif type == "quit" then

data/core/rootview.lua

@@ -27,6 +27,7 @@ function RootView:new()
   self.grab = nil -- = {view = nil, button = nil}
   self.overlapping_view = nil
   self.touched_view = nil
+  self.first_update_done = false
 end
 
 
@@ -372,7 +373,28 @@ end
 ---@return boolean
 function RootView:on_file_dropped(filename, x, y)
   local node = self.root_node:get_child_overlapping_point(x, y)
-  return node and node.active_view:on_file_dropped(filename, x, y)
+  local result = node and node.active_view:on_file_dropped(filename, x, y)
+  if result then return result end
+  local info = system.get_file_info(filename)
+  if info and info.type == "dir" then
+    if self.first_update_done then
+      -- first update done, open in new window
+      system.exec(string.format("%q %q", EXEFILE, filename))
+    else
+      -- DND event before first update, this is sent by macOS when folder is dropped into the dock
+      core.confirm_close_docs(core.docs, function(dirpath)
+        core.open_folder_project(dirpath)
+      end, system.absolute_path(filename))
+    end
+  else
+    local ok, doc = core.try(core.open_doc, filename)
+    if ok then
+      local node = core.root_view.root_node:get_child_overlapping_point(x, y)
+      node:set_active_view(node.active_view)
+      core.root_view:open_doc(doc)
+    end
+  end
+  return true
 end
 
 
@@ -460,6 +482,7 @@ function RootView:update()
   self:update_drag_overlay()
   self:interpolate_drag_overlay(self.drag_overlay)
   self:interpolate_drag_overlay(self.drag_overlay_tab)
+  self.first_update_done = true
 end
 
 

resources/macos/Info.plist.in

@@ -8,6 +8,30 @@
 	<string>lite-xl</string>
 	<key>CFBundleIconFile</key>
 	<string>icon.icns</string>
+	<key>CFBundleDocumentTypes</key>
+	<array>
+		<dict>
+			<key>CFBundleTypeExtensions</key>
+			<array>
+			  <string>*</string>
+			</array>
+			<key>CFBundleTypeRole</key>
+			<string>Editor</string>
+			<key>NSDocumentClass</key>
+			<string>NSDocument</string>
+			<key>CFBundleTypeName</key>
+			<string>All Files</string>
+		</dict>
+	</array>
+	<key>LSItemContentTypes</key>
+	<array>
+		<string>public.text</string>
+		<string>public.folder</string>
+	</array>
+	<key>NSExportableTypes</key>
+	<array>
+		<string>public.text</string>
+	</array>
 	<key>CFBundleIdentifier</key>
 	<string>com.lite-xl</string>
 	<key>CFBundleName</key>