Added check to ensure we are in lighttable view prior to callling darktable.register_lib. If darktable was invoked in single image (darkroom) mode, then an event handler is registered to detect the change from darkroom mode to lighttable mode so that we can then call darktable.register_lib.

official/enfuse.lua

@@ -46,10 +46,35 @@ du.check_min_api_version("3.0.0", "enfuse")
 -- Tell gettext where to find the .mo file translating messages for a particular domain
 gettext.bindtextdomain("enfuse",dt.configuration.config_dir..PS .. "lua" .. PS .. "locale" .. PS)
 
+local enf = {}
+enf.event_registered = false
+enf.module_installed = false
+enf.lib_widgets = {}
+
 local function _(msgid)
     return gettext.dgettext("enfuse", msgid)
 end
 
+local function install_module()
+  if not enf.module_installed then
+    dt.register_lib(
+      "enfuse",                                                                    -- plugin name
+      "enfuse",                                                                    -- name
+      true,                                                                        -- expandable
+      false,                                                                       -- resetable
+      {[dt.gui.views.lighttable] = {"DT_UI_CONTAINER_PANEL_RIGHT_CENTER", 100}},   -- containers
+      dt.new_widget("box")                                                         -- widget
+      {
+        orientation = "vertical",
+        sensitive = enfuse_installed,
+        table.unpack(enf.lib_widgets)
+      },
+      nil,-- view_enter
+      nil -- view_leave
+    )
+    enf.module_installed = true
+  end
+end
 -- add a new lib
 -- is enfuse installed?
 local enfuse_installed = df.check_if_bin_exists("enfuse")
@@ -229,30 +254,31 @@ if enfuse_installed then
   local lib_widgets = {}
 
   if not enfuse_installed then
-    table.insert(lib_widgets, df.executable_path_widget({"ffmpeg"}))
+    table.insert(enf.lib_widgets, df.executable_path_widget({"ffmpeg"}))
   end
-  table.insert(lib_widgets, exposure_mu)
-  table.insert(lib_widgets, depth)
-  table.insert(lib_widgets, blend_colorspace)
-  table.insert(lib_widgets, enfuse_button)
+  table.insert(enf.lib_widgets, exposure_mu)
+  table.insert(enf.lib_widgets, depth)
+  table.insert(enf.lib_widgets, blend_colorspace)
+  table.insert(enf.lib_widgets, enfuse_button)
 
    
   -- ... and tell dt about it all
-  dt.register_lib(
-    "enfuse",                                                                    -- plugin name
-    "enfuse",                                                                    -- name
-    true,                                                                        -- expandable
-    false,                                                                       -- resetable
-    {[dt.gui.views.lighttable] = {"DT_UI_CONTAINER_PANEL_RIGHT_CENTER", 100}},   -- containers
-    dt.new_widget("box")                                                         -- widget
-    {
-      orientation = "vertical",
-      sensitive = enfuse_installed,
-      table.unpack(lib_widgets)
-    },
-    nil,-- view_enter
-    nil -- view_leave
-  )
+  if dt.gui.current_view().name == "lighttable" then
+    install_module()
+  else
+    if not enf.event_registered then
+      dt.register_event(
+        "view-changed",
+        function(event, old_view, new_view)
+          if new_view.name == "lighttable" and old_view.name == "darkroom" then
+            dt.print_log("view changed from darkroom to lighttable")
+            install_module()
+           end
+        end
+      )
+      enf.event_registered = true
+    end
+  end
 else
   dt.print_error("enfuse executable not found")
   error("enfuse executable not found")