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[Will Timpson <850543@xxxxxxxxxxxxxxxxxx>]

My understanding is that xdg-user-dirs is useful in that it provides a
way for any application to find these folders on any system. I am basing
this on a cursory reading of: http://www.freedesktop.org/wiki/Software
/xdg-user-dirs. I think that I found that some part of Do is coded to
read that file in such a way that if it doesn't exist, it fails poorly
and the Files and Folders plugin is unusable as a result.  I don't
really know much about the internals of xdg or gnome-do. I'm just a
fellow Do user who had the same problem as you and was inspired by your
post to finally figure it out.

I actually just searched the source code (which I found here: http://gnome-do.sourcearchive.com/documentation/0.8.5-1/main.html) until I found the file that contained the line that was throwing the error (http://gnome-do.sourcearchive.com/documentation/0.8.5-1/EnvironmentServiceExtensions_8cs_source.html).
Then I figured that this line: userDirsPath = Path.Combine (configDir, "user-dirs.dirs"); contained the only Path.Combine that was likely to be throwing the error, since it contained an absolute reference (to user-dirs.dirs), while all the rest just referenced variables.
When I discovered that my filesystem did not contain any file named as such, I just searched the tubes for what that file was.

Et voila. (It actually took me an hour or two and I literally did a
little dance when I figured it out.)

P.S. I'm no developer, but if there are developers reading this, it
seems to me that there should be a better way of doing this. Does the
Files and Folders plugin (or the code in Do that the plugin is using)
need to read the user-dirs.dirs file to be useful? If not, there should
be a way to code it so that it can be used if available, but the
remaining functionality of Files and Folders is maintained in its
absence. If it is necessary, then xdg-user-dirs should be a dependency
of Do (or maybe the plugins?), so that user-dirs.dirs is available to Do
when it is needed (I realize that in this case, it is more of a
packaging problem). Any thoughts?

-- 
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https://bugs.launchpad.net/bugs/850543

Title:
  gnome3 breaks files and folders

Status in Do:
  New

Bug description:
  on ArchLinux x64 after upgrading to GNOME3 files and folders stopped
  working. I receive no results when searching for files. I uninstalled
  all plugins and receive the same error from "GNOME Special Locations"

  from the terminal:

  [code]
  $ gnome-do --debug
  [Info  15:45:21.647] [Services] Successfully located service of type IPreferencesService.
  [Info  15:45:21.656] [Services] Successfully located service of type ILogService.
  [Info  15:45:21.656] [Services] Successfully located service of type ISecurePreferencesService.
  [Info  15:45:21.664] [Services] Successfully located service of type INotificationsService.
  [Debug 15:45:21.668] [InterfaceManager] "Mini" interface was loaded
  [Info  15:45:21.669] [Services] Successfully located service of type ILogService.
  [Debug 15:45:21.669] [InterfaceManager] "Classic" interface was loaded
  [Debug 15:45:21.669] [InterfaceManager] "Glass" interface was loaded
  [Debug 15:45:21.670] [InterfaceManager] "Nouveau" interface was loaded
  [Debug 15:45:21.673] [PluginManager] Loaded "ApplicationItemSource" from plugin.
  [Debug 15:45:21.673] [PluginManager] Loaded "GNOMESpecialLocationsItemSource" from plugin.
  [Info  15:45:21.675] [Services] Successfully located service of type AbstractApplicationService.
  [Debug 15:45:21.676] [PluginManager] Loaded "InternalItemSource" from plugin.
  [Debug 15:45:21.676] [PluginManager] Loaded "ItemSourceItemSource" from plugin.
  [Debug 15:45:21.677] [PluginManager] Loaded "EmailAction" from plugin.
  [Debug 15:45:21.678] [PluginManager] Loaded "OpenAction" from plugin.
  [Debug 15:45:21.681] [PluginManager] Loaded "OpenUrlAction" from plugin.
  [Debug 15:45:21.681] [PluginManager] Loaded "OpenWithAction" from plugin.
  [Debug 15:45:21.681] [PluginManager] Loaded "RevealAction" from plugin.
  [Debug 15:45:21.682] [PluginManager] Loaded "RunAction" from plugin.
  [Debug 15:45:21.682] [PluginManager] Loaded "CopyToClipboardAction" from plugin.
  [Info  15:45:21.682] [Services] Successfully located service of type AbstractSystemService.
  [Debug 15:45:21.684] [SystemService] No other application instance detected. Continue startup.
  [Info  15:45:21.692] [Services] Successfully located service of type IPreferencesService.
  [Info  15:45:21.692] [Services] Successfully located service of type ISecurePreferencesService.
  [Debug 15:45:21.698] [Controller] Setting theme Classic
  [Info  15:45:21.791] [Services] Successfully located service of type IKeyBindingService.
  [Info  15:45:21.840] [Services] Successfully located service of type INetworkService.
  [Info  15:45:21.844] [UniverseManager] Reloading universe...
  [Debug 15:45:21.845] [UniverseManager] Reloading actions...
  [Debug 15:45:21.849] [UniverseManager] Reloading item source "Applications"...
  [Debug 15:45:21.973] [UniverseManager] Reloading item source "GNOME Special Locations"...
  [Info  15:45:21.987] [Services] Successfully located service of type IUniverseFactoryService.
  [Info  15:45:21.993] [Services] Successfully located service of type IEnvironmentService.
  Do.Universe.Linux.GNOMESpecialLocationsItemSource "GNOME Special Locations" encountered an error in UpdateItems: System.TypeInitializationException: An exception was thrown by the type initializer for Do.Universe.Linux.FileItem ---> System.ArgumentNullException: Argument cannot be null.
  Parameter name: path2
    at System.IO.Path.Combine (System.String path1, System.String path2) [0x00000] in <filename unknown>:0 
    at Do.Platform.Linux.EnvironmentServiceExtensions.PathForXdgVariable (IEnvironmentService envService, System.String key, System.String fallback) [0x00000] in <filename unknown>:0 
    at Do.Platform.Linux.EnvironmentServiceExtensions.MaybePathForXdgVariable (IEnvironmentService envService, System.String key) [0x00000] in <filename unknown>:0 
    at Do.Universe.Linux.FileItem..cctor () [0x00000] in <filename unknown>:0 
    --- End of inner exception stack trace ---
    at Do.Platform.Linux.UniverseFactoryService.NewFileItem (System.String path) [0x00000] in <filename unknown>:0 
    at Do.Universe.Linux.GNOMESpecialLocationsItemSource+<ReadBookmarkItems>c__Iterator3.MoveNext () [0x00000] in <filename unknown>:0 
    at Do.Universe.Linux.GNOMESpecialLocationsItemSource.UpdateItems () [0x00000] in <filename unknown>:0 
    at Do.Universe.Safe.SafeItemSource.UpdateItems () [0x00000] in <filename unknown>:0 .
  [Debug 15:45:22.001] [UniverseManager] Reloading item source "Internal GNOME Do Items"...
  [Debug 15:45:22.002] [UniverseManager] Reloading item source "GNOME Do Item Sources"...
  [Info  15:45:22.003] [UniverseManager] Universe contains 156 items.
  [Debug 15:47:22.008] [UniverseManager] Reloading item source "Applications"...
  [Debug 15:47:22.036] [UniverseManager] Reloading item source "GNOME Special Locations"...
  Do.Universe.Linux.GNOMESpecialLocationsItemSource "GNOME Special Locations" encountered an error in UpdateItems: System.TypeInitializationException: An exception was thrown by the type initializer for Do.Universe.Linux.FileItem ---> System.ArgumentNullException: Argument cannot be null.
  Parameter name: path2
    at System.IO.Path.Combine (System.String path1, System.String path2) [0x00000] in <filename unknown>:0 
    at Do.Platform.Linux.EnvironmentServiceExtensions.PathForXdgVariable (IEnvironmentService envService, System.String key, System.String fallback) [0x00000] in <filename unknown>:0 
    at Do.Platform.Linux.EnvironmentServiceExtensions.MaybePathForXdgVariable (IEnvironmentService envService, System.String key) [0x00000] in <filename unknown>:0 
    at Do.Universe.Linux.FileItem..cctor () [0x00000] in <filename unknown>:0 
    --- End of inner exception stack trace ---
    at Do.Platform.Linux.UniverseFactoryService.NewFileItem (System.String path) [0x00000] in <filename unknown>:0 
    at Do.Universe.Linux.GNOMESpecialLocationsItemSource+<ReadBookmarkItems>c__Iterator3.MoveNext () [0x00000] in <filename unknown>:0 
    at Do.Universe.Linux.GNOMESpecialLocationsItemSource.UpdateItems () [0x00000] in <filename unknown>:0 
    at Do.Universe.Safe.SafeItemSource.UpdateItems () [0x00000] in <filename unknown>:0 .
  [/code]

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