libs-gui/Source/NSWorkspace.m

/** <title>NSWorkspace</title>

   <abstract>Workspace class</abstract>

   Copyright (C) 1996-1999, 2001 Free Software Foundation, Inc.

   Author: Scott Christley <scottc@net-community.com>
   Date: 1996
   Implementation by: Richard Frith-Macdonald <richard@brainstorm.co.uk>
   Date: 1998
   Implementation by: Fred Kiefer <FredKiefer@gmx.de>
   Date: 2001
   
   This file is part of the GNUstep GUI Library.

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.
   
   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with this library; see the file COPYING.LIB.
   If not, write to the Free Software Foundation,
   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/ 

#include "config.h"

#if	defined(HAVE_GETMNTENT) && defined (MNT_MEMB)
#if	defined(HAVE_MNTENT_H)
#include <mntent.h>
#elif defined(HAVE_SYS_MNTENT_H)
#include <sys/mntent.h>
#else
#undef	HAVE_GETMNTENT
#endif
#endif

#include <Foundation/NSBundle.h>
#include <Foundation/NSDictionary.h>
#include <Foundation/NSHost.h>
#include <Foundation/NSLock.h>
#include <Foundation/NSPathUtilities.h>
#include <Foundation/NSUserDefaults.h>
#include <Foundation/NSTask.h>
#include <Foundation/NSException.h>
#include <Foundation/NSFileManager.h>
#include <Foundation/NSNotificationQueue.h>
#include <Foundation/NSDistributedNotificationCenter.h>
#include <Foundation/NSConnection.h>
#include <Foundation/NSDebug.h>
#include <Foundation/NSURL.h>
#include <Foundation/NSValue.h>
#include "AppKit/NSWorkspace.h"
#include "AppKit/NSApplication.h"
#include "AppKit/NSImage.h"
#include "AppKit/NSView.h"
#include "AppKit/NSPanel.h"
#include "AppKit/NSWindow.h"
#include "AppKit/NSScreen.h"
#include "GNUstepGUI/GSServicesManager.h"
#include "GNUstepGUI/GSDisplayServer.h"

#define PosixExecutePermission	(0111)

static NSImage	*folderImage = nil;
static NSImage	*homeImage = nil;
static NSImage	*multipleFiles = nil;
static NSImage	*rootImage = nil;
static NSImage	*unknownApplication = nil;
static NSImage	*unknownTool = nil;


static NSString	*GSWorkspaceNotification = @"GSWorkspaceNotification";

@interface	_GSWorkspaceCenter: NSNotificationCenter
{
  NSDistributedNotificationCenter	*remote;
}
- (void) _handleRemoteNotification: (NSNotification*)aNotification;
@end

@implementation	_GSWorkspaceCenter

- (void) dealloc
{
  [remote removeObserver: self name: nil object: GSWorkspaceNotification];
  RELEASE(remote);
  [super dealloc];
}

- (id) init
{
  self = [super init];
  if (self != nil)
    {
      remote = RETAIN([NSDistributedNotificationCenter defaultCenter]);
      NS_DURING
	{
	  [remote addObserver: self
		     selector: @selector(_handleRemoteNotification:)
			 name: nil
		       object: GSWorkspaceNotification];
	}
      NS_HANDLER
	{
	  NSUserDefaults	*defs = [NSUserDefaults standardUserDefaults];

	  if ([defs boolForKey: @"GSLogWorkspaceTimeout"])
	    {
	      NSLog(@"NSWorkspace caught exception %@: %@", 
	        [localException name], [localException reason]);
	    }
	  else
	    {
	      [localException raise];
	    }
	}
      NS_ENDHANDLER
    }
  return self;
}

/*
 * Post notification remotely - since we are listening for distributed
 * notifications, we will observe the notification arriving from the
 * distributed notification center, and it will get sent out locally too.
 */
- (void) postNotification: (NSNotification*)aNotification
{
  NSNotification	*rem;

  rem = [NSNotification notificationWithName: [aNotification name]
				      object: GSWorkspaceNotification
				    userInfo: [aNotification userInfo]];
  NS_DURING
    {
      [remote postNotification: rem];
    }
  NS_HANDLER
    {
      NSUserDefaults	*defs = [NSUserDefaults standardUserDefaults];

      if ([defs boolForKey: @"GSLogWorkspaceTimeout"])
	{
	  NSLog(@"NSWorkspace caught exception %@: %@", 
	    [localException name], [localException reason]);
	}
      else
	{
	  [localException raise];
	}
    }
  NS_ENDHANDLER
}

- (void) postNotificationName: (NSString*)name 
		       object: (id)object
{
  [self postNotification: [NSNotification notificationWithName: name
							object: object]];
}

- (void) postNotificationName: (NSString*)name 
		       object: (id)object
		     userInfo: (NSDictionary*)info
{
  [self postNotification: [NSNotification notificationWithName: name
							object: object
						      userInfo: info]];
}

/*
 * Forward a notification from a remote application to observers in this
 * application.
 */
- (void) _handleRemoteNotification: (NSNotification*)aNotification
{
  [super postNotification: aNotification];
}

@end


@interface NSWorkspace (Private)

// Icon handling
- (NSImage*) _extIconForApp: (NSString*)appName info: (NSDictionary*)extInfo;
- (NSImage*) unknownFiletypeImage;
- (NSImage*) _saveImageFor: (NSString*)iconPath;
- (NSString*) thumbnailForFile: (NSString *)file;
- (NSImage*) _iconForExtension: (NSString*)ext;
- (BOOL) _extension: (NSString*)ext
               role: (NSString*)role
	        app: (NSString**)app;

// application communication
- (BOOL) _launchApplication: (NSString*)appName
		  arguments: (NSArray*)args;
- (id) _connectApplication: (NSString*)appName;
- (id) _workspaceApplication;

@end


/**
 * <p>The NSWorkspace class gathers together a large number of capabilities
 * needed for workspace management.
 * </p>
 * <p>The make_services tool examines all applications (anything with a
 * .app, .debug, or .profile suffix) in the system, local, and user Apps
 * directories, and caches information about the services each app
 * provides (extracted from the Info-gnustep.plist file in each application).
 * </p>
 * <p>In addition to the cache of services information, it builds a cache of
 * information about all known applications (including information about file
 * types they handle).
 * </p>
 * <p>NSWorkspace reads the cache and uses it to determine which application
 * to use to open a document and which icon to use to represent that document.
 * </p>
 * <p>The NSWorkspace API has been extended to provide methods for
 * finding/setting the preferred icon/application for a particular file
 * type. NSWorkspace will use the 'best' icon/application available.
 * </p>
 * <p>To determine the executable to launch, if there was an
 * Info-gnustep.plist/Info.plist in the app wrapper and it had an
 * NSExecutable field - it uses that name. Otherwise, it tries to use
 * the name of the app - eg. foo.app/foo <br />
 * The executable is launched by NSTask, which handles the addition
 * of machine/os/library path components as necessary.
 * </p>
 * <p>To determine the icon for a file, it uses the value from the
 * cache of icons for the file extension, or use an 'unknown' icon.
 * </p>
 * <p>To determine the icon for a folder, if the folder has a '.app',
 * '.debug' or '.profile' extension - the Info-gnustep.plist file
 * is examined for an 'NSIcon' value and NSWorkspace tries to use that.
 * If there is no value specified - it tries foo.app/foo.tiff' or
 * 'foo.app/.dir.tiff'
 * </p>
 * <p>If the folder was not an application wrapper, it just tries
 * the .dir.tiff file.
 * </p>
 * <p>If no icon was available, it uses a default folder icon or a
 * special icon for the root directory.
 * </p>
 * <p>The information about what file types an app can handle needs
 * to be stored in Info-gnustep.plist in an array keyed on the name
 * <em>NSTypes</em>, within which each value is a dictionary.<br />
 * </p>
 * <p>In the NSTypes fields, NSWorkspace uses NSIcon (the icon to use
 * for the type) NSUnixExtensions (a list of file extensions
 * corresponding to the type) and NSRole (what the app can do with
 * documents of this type <em>Editor</em>, <em>Viewer</em>,
 * or <em>None</em>). In the AppList cache, make_services
 * generates a dictionary, keyed by file extension, whose values are
 * the dictionaries containing the NSTypes dictionaries of each
 * of the apps that handle the extension.  The NSWorkspace class
 * makes use of this cache at runtime.
 * </p>
 * <p>If the Info-gnustep.plist of an application says that it
 * can open files with a particular extension, then when NSWorkspace
 * is asked to open such a file it will attempt to send an
 * -application:openFile: message to the application (which must be
 * handled by the applications delegate).  If the application is not
 * running, NSWorkspace will instead attempt to launch the application
 * passing the filename to open after a '-GSFilePath' flag
 * in the command line arguments.  For a GNUstep application, the
 * application will recognize this and invoke the -application:openFile:
 * method passing it the file name.
 * </p>
 * <p>This command line argument mechanism provides a way for non-gnustep
 * applications to be used to open files simply by provideing a wrapper
 * for them containing the appropriate Info-gnustep.plist.<br />
 * For instance - you could set up xv.app to contain a shellscript 'xv'
 * that would start the real xv binary passing it a file to open if the
 * '-GSFilePath' argument was given. The Info-gnustep.plist file could look
 * like this:
 * </p>
 * <example>
 * 
 * {
 *   NSExecutable = "xv";
 *   NSIcon = "xv.tiff";
 *   NSTypes = (
 *     {
 *       NSIcon = "tiff.tiff";
 *       NSUnixExtensions = ( tiff, tif );
 *     },
 *     {
 *       NSIcon = "xbm.tiff";
 *       NSUnixExtensions = ( xbm );
 *     }
 *   );
 * }
 * </example>
 */
@implementation	NSWorkspace

static NSWorkspace		*sharedWorkspace = nil;

static NSString			*appListPath = nil;
static NSDictionary		*applications = nil;

static NSString			*extPrefPath = nil;
static NSDictionary		*extPreferences = nil;
// FIXME: Won't work for MINGW
static NSString			*_rootPath = @"/";

/*
 * Class methods
 */
+ (void) initialize
{
  if (self == [NSWorkspace class])
    {
      static BOOL	beenHere = NO;
      NSFileManager	*mgr = [NSFileManager defaultManager];
      NSString		*service;
      NSData		*data;
      NSDictionary	*dict;

      [self setVersion: 1];

      [gnustep_global_lock lock];
      if (beenHere == YES)
	{
	  [gnustep_global_lock unlock];
	  return;
	}

      beenHere = YES;

      NS_DURING
	{
	  service = [[NSSearchPathForDirectoriesInDomains(NSUserDirectory, 
							  NSUserDomainMask, 
							  YES) 
							 objectAtIndex: 0]
		      stringByAppendingPathComponent: @"Library/Services"];
	  
	  /*
	   *	Load file extension preferences.
	   */
	  extPrefPath = [service
			  stringByAppendingPathComponent: @".GNUstepExtPrefs"];
	  RETAIN(extPrefPath);
	  if ([mgr isReadableFileAtPath: extPrefPath] == YES)
	    {
	      data = [NSData dataWithContentsOfFile: extPrefPath];
	      if (data)
		{
		  dict = [NSDeserializer deserializePropertyListFromData: data
					 mutableContainers: NO];
		  extPreferences = RETAIN(dict);
		}
	    }
	  
	  /*
	   *	Load cached application information.
	   */
	  appListPath = [service
			  stringByAppendingPathComponent: @".GNUstepAppList"];
	  RETAIN(appListPath);
	  if ([mgr isReadableFileAtPath: appListPath] == YES)
	    {
	      data = [NSData dataWithContentsOfFile: appListPath];
	      if (data)
		{
		  dict = [NSDeserializer deserializePropertyListFromData: data
					 mutableContainers: NO];
		  applications = RETAIN(dict);
		}
	    }
	}
      NS_HANDLER
	{
	  [gnustep_global_lock unlock];
	  [localException raise];
	}
      NS_ENDHANDLER

      [gnustep_global_lock unlock];
    }
}

+ (id) allocWithZone: (NSZone*)zone
{
  [NSException raise: NSInvalidArgumentException
	      format: @"You may not allocate a workspace directly"];
  return nil;
}

/*
 * Creating a Workspace
 */
+ (NSWorkspace*) sharedWorkspace
{
  if (sharedWorkspace == nil)
    {
      [gnustep_global_lock lock];
      if (sharedWorkspace == nil)
	{
	  sharedWorkspace =
		(NSWorkspace*)NSAllocateObject(self, 0, NSDefaultMallocZone());
	  [sharedWorkspace init];
	}
      [gnustep_global_lock unlock];
    }
  return sharedWorkspace;
}

/*
 * Instance methods
 */
- (void) dealloc
{
  [NSException raise: NSInvalidArgumentException
	      format: @"Attempt to call dealloc for shared worksapace"];
}

- (id) init
{
  if (sharedWorkspace != self)
    {
      RELEASE(self);
      return RETAIN(sharedWorkspace);
    }

  [[NSNotificationCenter defaultCenter]
    addObserver: self
    selector: @selector(noteUserDefaultsChanged)
    name: NSUserDefaultsDidChangeNotification
    object: nil];

  _workspaceCenter = [_GSWorkspaceCenter new];
  _iconMap = [NSMutableDictionary new];
  _launched = [NSMutableDictionary new];
  if (applications == nil)
    {
      [self findApplications];
    }

  return self;
}

/*
 * Opening Files
 */
- (BOOL) openFile: (NSString*)fullPath
{
  return [self openFile: fullPath withApplication: nil];
}

- (BOOL) openFile: (NSString*)fullPath
        fromImage: (NSImage*)anImage
	       at: (NSPoint)point
	   inView: (NSView*)aView
{
  NSWindow *win = [aView window];
  NSPoint screenLoc = [win convertBaseToScreen:
			[aView convertPoint: point toView: nil]];
  NSSize screenSize = [[win screen] frame].size;
  NSPoint screenCenter = NSMakePoint(screenSize.width / 2, 
				     screenSize.height / 2);

  [self slideImage: anImage from: screenLoc to: screenCenter];
  return [self openFile: fullPath];
}

- (BOOL) openFile: (NSString*)fullPath
  withApplication: (NSString*)appName
{
  return [self openFile: fullPath withApplication: appName andDeactivate: YES];
}

- (BOOL) openFile: (NSString*)fullPath
  withApplication: (NSString*)appName
    andDeactivate: (BOOL)flag
{
  id app;

  if (appName == nil)
    {
      NSString *ext = [fullPath pathExtension];
  
      if ([self _extension: ext role: nil app: &appName] == NO)
        {
	  NSWarnLog(@"No known applications for file extension '%@'", ext);
	  return NO;
	}
    }

  app = [self _connectApplication: appName];
  if (app == nil)
    {
      NSArray *args;

      args = [NSArray arrayWithObjects: @"-GSFilePath", fullPath, nil];
      return [self _launchApplication: appName arguments: args];
    }
  else
    {
      NS_DURING
	{
	  if (flag == NO)
	    {
	      [app application: NSApp openFileWithoutUI: fullPath];
	    }
	  else
	    {
	      [app application: NSApp openFile: fullPath];
	    }
	}
      NS_HANDLER
	{
	  NSWarnLog(@"Failed to contact '%@' to open file", appName);
	  return NO;
	}
      NS_ENDHANDLER
    }
  if (flag)
    {
      [NSApp deactivate];
    }
  return YES;
}

- (BOOL) openTempFile: (NSString*)fullPath
{
  id app;
  NSString *appName;
  NSString *ext = [fullPath pathExtension];
  
  if ([self _extension: ext role: nil app: &appName] == NO)
    {
      NSWarnLog(@"No known applications for file extension '%@'", ext);
      return NO;
    }

  app = [self _connectApplication: appName];
  if (app == nil)
    {
      NSArray *args;

      args = [NSArray arrayWithObjects: @"-GSTempPath", fullPath, nil];
      return [self _launchApplication: appName arguments: args];
    }
  else
    {
      NS_DURING
	{
	  [app application: NSApp openTempFile: fullPath];
	}
      NS_HANDLER
	{
	  NSWarnLog(@"Failed to contact '%@' to open temp file", appName);
	  return NO;
	}
      NS_ENDHANDLER
    }

  [NSApp deactivate];

  return YES;
}

- (BOOL) openURL: (NSURL*)url
{
  if ([url isFileURL])
    {
      return [self openFile: [url path]];
    }
  else
    {
      return NO;
    }
}

/*
 * Manipulating Files	
 */
- (BOOL) performFileOperation: (NSString*)operation
		       source: (NSString*)source
		  destination: (NSString*)destination
		        files: (NSArray*)files
			  tag: (int*)tag
{
  id app = [self _workspaceApplication];

  if (app == nil)
    {
      return NO;
    }
  else
    {
      // Send the request on to the Workspace application
      return [app performFileOperation: operation
				source: source
			   destination: destination
				 files: files
				   tag: tag];
    }
}

- (BOOL) selectFile: (NSString*)fullPath
inFileViewerRootedAtPath: (NSString*)rootFullpath
{
  id app = [self _workspaceApplication];

  if (app == nil)
    {
      return NO;
    }
  else
    {
      // Send the request on to the Workspace application
      return [app selectFile: fullPath
	inFileViewerRootedAtPath: rootFullpath];
    }
}

/**
 * Given an application name, return the full path for that application.<br />
 * This method looks for the application in standard locations, and if not
 * found there, according to MacOS-X documentation, returns nil.<br />
 * If the supplied application name is an absolute path, returns that path
 * irrespective of whether such an application exists or not.  This is
 * <em>not</em> the docmented debavior in the MacOS-X documentation, but is
 * the MacOS-X implemented behavior.<br />
 * If the appName has an extension, it is used, otherwise in GNUstep
 * the standard app, debug, and profile extensions * are tried.<br />
 */
- (NSString*) fullPathForApplication: (NSString*)appName
{
  NSString	*base;
  NSString	*path;
  NSString	*ext;

  if ([appName length] == 0)
    {
      return nil;
    }
  if ([[appName lastPathComponent] isEqual: appName] == NO)
    {
      if ([appName isAbsolutePath] == YES)
	{
	  return appName;		// MacOS-X implementation behavior.
	}
      /*
       * Relative path ... get standarized absolute path
       */
      path = [[NSFileManager defaultManager] currentDirectoryPath];
      appName = [path stringByAppendingPathComponent: appName];
      appName = [appName stringByStandardizingPath];
    }
  base = [appName stringByDeletingLastPathComponent];
  appName = [appName lastPathComponent];
  ext = [appName pathExtension];
  if ([ext length] == 0) // no extension, let's find one
    {
      path = [appName stringByAppendingPathExtension: @"app"];
      path = [applications objectForKey: path];
      if (path == nil)
	{
	  path = [appName stringByAppendingPathExtension: @"debug"];
	  path = [applications objectForKey: path];
	}
      if (path == nil)
	{
	  path = [appName stringByAppendingPathExtension: @"profile"];
	  path = [applications objectForKey: path];
	}
    }
  else
    {
      path = [applications objectForKey: appName];
    }

  /*
   * If the original name included a path, check that the located name
   * matches it.  If it doesn't we return nil as MacOS-X does.
   */
  if ([base length] > 0
    && [base isEqual: [path stringByDeletingLastPathComponent]] == NO)
    {
      path = nil;
    }
  return path;
}

- (BOOL) getFileSystemInfoForPath: (NSString*)fullPath
		      isRemovable: (BOOL*)removableFlag
		       isWritable: (BOOL*)writableFlag
		    isUnmountable: (BOOL*)unmountableFlag
		      description: (NSString **)description
			     type: (NSString **)fileSystemType
{
  // FIXME
  return NO;
}

/**
 * This method gets information about the file at fullPath and
 * returns YES on success, NO if the named file could not be
 * found.<br />
 * On success, the name of the preferred application for opening
 * the file is returned in *appName, or nil if there is no known
 * application to open it.<br />
 * The returned value in *type describes the file using one of
 * the following constants.
 * <deflist>
 *   <term>NSPlainFileType</term>
 *   <desc>
 *     A plain file or a directory that some application
 *     claims to be able to open like a file.
 *   </desc>
 *   <term>NSDirectoryFileType</term>
 *   <desc>An untyped directory</desc>
 *   <term>NSApplicationFileType</term>
 *   <desc>A GNUstep application</desc>
 *   <term>NSFilesystemFileType</term>
 *   <desc>A file system mount point</desc>
 *   <term>NSShellCommandFileType</term>
 *   <desc>Executable shell command</desc>
 * </deflist>
 */
- (BOOL) getInfoForFile: (NSString*)fullPath
	    application: (NSString **)appName
		   type: (NSString **)type
{
  NSFileManager	*fm = [NSFileManager defaultManager];
  NSDictionary	*attributes;
  NSString	*fileType;
  NSString	*extension = [fullPath pathExtension];

  attributes = [fm fileAttributesAtPath: fullPath traverseLink: YES];

  if (attributes != nil)
    {
      *appName = [self getBestAppInRole: nil forExtension: extension];
      fileType = [attributes fileType];
      if ([fileType isEqualToString: NSFileTypeRegular])
	{
	  if ([attributes filePosixPermissions] & PosixExecutePermission)
	    {
	      *type = NSShellCommandFileType;
	    }
	  else
	    {
	      *type = NSPlainFileType;
	    }
	}
      else if ([fileType isEqualToString: NSFileTypeDirectory])
	{
	  if ([extension isEqualToString: @"app"]
	    || [extension isEqualToString: @"debug"]
	    || [extension isEqualToString: @"profile"])
	    {
	      *type = NSApplicationFileType;
	    }
	  else if ([extension isEqualToString: @"bundle"])
	    {
	      *type = NSPlainFileType;
	    }
	  else if (*appName != nil && [extension length] > 0)
	    {
	      *type = NSPlainFileType;
	    }
	  /*
	   * The idea here is that if the parent directory's
	   * fileSystemNumber differs, this must be a filesystem
	   * mount point.
	   */
	  else if ([[fm fileAttributesAtPath:
	    [fullPath stringByDeletingLastPathComponent]
	    traverseLink: YES] fileSystemNumber]
	    != [attributes fileSystemNumber])
	    {
	      *type = NSFilesystemFileType;
	    }
	  else
	    {
	      *type = NSDirectoryFileType;
	    }
	}
      else
	{
	  /*
	   * This catches sockets, character special, block special,
	   * and unknown file types
	   */
	  *type = NSPlainFileType;
	}
      return YES;
    }
  else
    {
      return NO;
    }
}

- (NSImage*) iconForFile: (NSString*)fullPath
{
  NSImage	*image = nil;
  NSString	*pathExtension = [[fullPath pathExtension] lowercaseString];

  if ([self isFilePackageAtPath: fullPath])
    {
      NSFileManager	*mgr = [NSFileManager defaultManager];
      NSString		*iconPath = nil;
      BOOL		isApplication = NO;
      
      if ([pathExtension isEqualToString: @"app"]
	|| [pathExtension isEqualToString: @"debug"]
	|| [pathExtension isEqualToString: @"profile"])
	{
          isApplication = YES;
	  
	  image = [self appIconForApp: fullPath];
	  
	  if (image == nil)
	    {
	      /*
               * Just use the appropriate icon for the path extension
               */
              return [self _iconForExtension: pathExtension];
	    }
	}

      /*
       * If we have no iconPath, try 'dir/.dir.tiff' as a
       * possible locations for the directory icon.
       */
      if (iconPath == nil)
	{
	  iconPath = [fullPath stringByAppendingPathComponent: @".dir.tiff"];
	  if ([mgr isReadableFileAtPath: iconPath] == NO)
	    {
	      iconPath = nil;
	    }
	}

      if (iconPath != nil)
	{
	  image = [self _saveImageFor: iconPath];
	}

      if (image == nil)
	{
	  image = [self _iconForExtension: pathExtension];
	  if (image == nil || image == [self unknownFiletypeImage])
	    {
	      if ([fullPath isEqual: _rootPath])
		{
		  if (rootImage == nil)
		    {
		      rootImage = RETAIN([NSImage _standardImageWithName:
			@"Root_PC.tiff"]);
		    }

		  image = rootImage;
		}
	      else if ([fullPath isEqual: NSHomeDirectory ()])
		{
		  if (homeImage == nil)
		    {
		      homeImage = RETAIN([NSImage _standardImageWithName:
			@"HomeDirectory.tiff"]);
		    }
		  image = homeImage;
		}
	      else
		{
		  if (folderImage == nil)
		    {
		      folderImage = RETAIN([NSImage _standardImageWithName:
			@"Folder.tiff"]);
		    }
		  image = folderImage;
		}
	    }
	}
    }
  else
    {
      NSDebugLog(@"pathExtension is '%@'", pathExtension);

      if ([[NSUserDefaults standardUserDefaults] boolForKey: 
	      @"GSUseFreedesktopThumbnails"])
        {
	  /* This image will be 128x128 pixels as oposed to the 48x48 
	     of other GNUstep icons or the 32x32 of the specification */  
	  image = [self _saveImageFor: [self thumbnailForFile: fullPath]];
	  if (image != nil)
	    {
	      return image;
	    }
	}

      image = [self _iconForExtension: pathExtension];
      if (image == nil || image == [self unknownFiletypeImage])
	{
	  NSFileManager	*mgr;

	  mgr = [NSFileManager defaultManager];
	  if ([mgr isExecutableFileAtPath: fullPath] == YES)
	    {
	      NSDictionary	*attributes;
	      NSString		*fileType;

	      attributes = [mgr fileAttributesAtPath: fullPath
					traverseLink: YES];
	      fileType = [attributes objectForKey: NSFileType];
	      if ([fileType isEqual: NSFileTypeRegular] == YES)
		{
		  if (unknownTool == nil)
		    {
		      unknownTool = RETAIN([NSImage _standardImageWithName:
			@"UnknownTool.tiff"]);
		    }
		  image = unknownTool;
		}
	    }
	}
    }

  if (image == nil)
    {
      image = [self unknownFiletypeImage];
    }

  return image;
}

- (NSImage*) iconForFiles: (NSArray*)pathArray
{
  if ([pathArray count] == 1)
    {
      return [self iconForFile: [pathArray objectAtIndex: 0]];
    }
  if (multipleFiles == nil)
    {
      // FIXME: Icon does not exist
      multipleFiles = [NSImage imageNamed: @"FileIcon_multi"];
    }

  return multipleFiles;
}

- (NSImage*) iconForFileType: (NSString*)fileType
{
  return [self _iconForExtension: fileType];
}

- (BOOL) isFilePackageAtPath: (NSString*)fullPath
{
  NSFileManager	*mgr = [NSFileManager defaultManager];
  NSDictionary	*attributes;
  NSString	*fileType;

  attributes = [mgr fileAttributesAtPath: fullPath traverseLink: YES];
  fileType = [attributes objectForKey: NSFileType];
  if ([fileType isEqual: NSFileTypeDirectory] == YES)
    {
      return YES;
    }
  return NO;
}

/**
 * Tracking Changes to the File System
 */
- (BOOL) fileSystemChanged
{
  BOOL flag = _fileSystemChanged;

  _fileSystemChanged = NO;
  return flag;
}

- (void) noteFileSystemChanged
{
  _fileSystemChanged = YES;
}

- (void) noteFileSystemChanged: (NSString*)path
{
  _fileSystemChanged = YES;
}

/**
 * Updates Registered Services, File Types, and other information about any
 * applications installed in the standard locations.
 */
- (void) findApplications
{
  static NSString	*path = nil;
  NSFileManager		*mgr = [NSFileManager defaultManager];
  NSData		*data;
  NSDictionary		*dict;
  NSTask		*task;

  /*
   * Try to locate and run an executable copy of 'make_services'
   */
  if (path == nil)
    {
#ifdef GNUSTEP_BASE_LIBRARY
      path = RETAIN([[NSSearchPathForDirectoriesInDomains(
	  GSToolsDirectory, NSSystemDomainMask, YES) objectAtIndex: 0] 
		 stringByAppendingPathComponent: @"make_services"]);
#else
      path = RETAIN([[@GNUSTEP_INSTALL_PREFIX 
			 stringByAppendingPathComponent: @"Tools"] 
			stringByAppendingPathComponent: @"make_services"]);
#endif
    }
  task = [NSTask launchedTaskWithLaunchPath: path
				  arguments: nil];
  if (task != nil)
    {
      [task waitUntilExit];
    }
  if ([mgr isReadableFileAtPath: extPrefPath] == YES)
    {
      data = [NSData dataWithContentsOfFile: extPrefPath];
      if (data)
	{
	  dict = [NSDeserializer deserializePropertyListFromData: data
					       mutableContainers: NO];
	  ASSIGN(extPreferences, dict);
	}
    }

  if ([mgr isReadableFileAtPath: appListPath] == YES)
    {
      data = [NSData dataWithContentsOfFile: appListPath];
      if (data)
	{
	  dict = [NSDeserializer deserializePropertyListFromData: data
					       mutableContainers: NO];
	  ASSIGN(applications, dict);
	}
    }
  /*
   *	Invalidate the cache of icons for file extensions.
   */
  [_iconMap removeAllObjects];
}

/**
 * Instructs all the other running applications to hide themselves.
 * <em>not yet implemented</em>
 */
- (void) hideOtherApplications
{
  // FIXME
}

/**
 * Calls -launchApplication:showIcon:autolaunch: with arguments set to
 * show the icon but not set it up as an autolaunch.
 */ 
- (BOOL) launchApplication: (NSString*)appName
{
  return [self launchApplication: appName
			showIcon: YES
		      autolaunch: NO];
}

/**
 * <p>Launches the specified application (unless it is already running).<br />
 * If the autolaunch flag is yes, sets the autolaunch user default for the
 * newly launched application, so that applications which understand the
 * concept of being autolaunched at system startup time can modify their
 * behavior appropriately.
 * </p>
 * <p>Sends an NSWorkspaceWillLaunchApplicationNotification before it
 * actually attempts to launch the application (this is not sent if the
 * application is already running).
 * </p>
 * <p>The application sends an NSWorkspaceDidlLaunchApplicationNotification
 * on completion of launching.  This is not sent if the application is already
 * running, or if it fails to complete its startup.
 * </p>
 * <p>Returns NO if the application cannot be launched (eg. it does not exist
 * or the binary is not executable).
 * </p>
 * <p>Returns YES if the application was already running or of it was launched
 * (this does not necessarily mean that the application succeeded in starting
 * up fully).
 * </p>
 * <p>Once an application has fully started up, you should be able to connect
 * to it using [NSConnection+rootProxyForConnectionWithRegisteredName:host:]
 * passing the application name (normally the filesystem name excluding path
 * and file extension) and an empty host name.  This will let you communicate
 * with the the [NSApplication-delegate] of the launched application, and you
 * can generally use this as a test of whether an application is running
 * correctly.
 * </p>
 */
- (BOOL) launchApplication: (NSString*)appName
		  showIcon: (BOOL)showIcon
	        autolaunch: (BOOL)autolaunch
{
  id app;

  app = [self _connectApplication: appName];
  if (app == nil)
    {
      NSArray	*args = nil;

      if (autolaunch == YES)
	{
	  args = [NSArray arrayWithObjects: @"-autolaunch", @"YES", nil];
	}
      return [self _launchApplication: appName arguments: args];
    }
  else
    {
      [app activateIgnoringOtherApps:YES];
    }

  return YES;
}

/**
 * Returns a description of the currently active application, containing
 * the name (NSApplicationName), path (NSApplicationPath) and process
 * identifier (NSApplicationProcessIdentifier).
 */
- (NSDictionary*) activeApplication
{
  NSProcessInfo *processInfo = [NSProcessInfo processInfo];

  return [NSDictionary dictionaryWithObjectsAndKeys:
    [processInfo processName], @"NSApplicationName",
    [[NSBundle mainBundle] bundlePath], @"NSApplicationPath",
    [NSNumber numberWithInt: [processInfo processIdentifier]], 
		   @"NSApplicationProcessIdentifier",
    nil];
}

/**
 * Returns an array listing all the applications know to have been
 * launched.
 */
- (NSArray*) launchedApplications
{
  NSDictionary		*dict;
  NSString		*app;
  NSMutableArray	*apps = [NSMutableArray array];
  NSEnumerator		*enumerator = [_launched keyEnumerator];

  while ((app = [enumerator nextObject]) != nil)
    {
      dict = [NSDictionary dictionaryWithObject: app
					 forKey: @"NSApplicationName"];
      [apps addObject: dict];
    }
  
  return apps;
}

/*
 * Unmounting a Device	
 */
- (BOOL) unmountAndEjectDeviceAtPath: (NSString*)path
{
  NSDictionary	*userinfo;
  NSTask	*task;
  BOOL		flag = NO;

  userinfo = [NSDictionary dictionaryWithObject: path
					 forKey: @"NSDevicePath"];
  [_workspaceCenter postNotificationName: NSWorkspaceWillUnmountNotification
				  object: self
				userInfo: userinfo];

  // FIXME This is system specific
  task = [NSTask launchedTaskWithLaunchPath: @"eject"
				  arguments: [NSArray arrayWithObject: path]];
  if (task != nil)
    {
      [task waitUntilExit];
      if ([task terminationStatus] != 0)
	{
	  return NO;
	}
      else
	{
	  flag = YES;
	}
    }
  else
    {
      return NO;
    }

  [_workspaceCenter postNotificationName: NSWorkspaceDidUnmountNotification
				  object: self
				userInfo: userinfo];
  return flag;
}

/*
 * Tracking Status Changes for Devices
 */
- (void) checkForRemovableMedia
{
  // FIXME
}

- (NSArray*) mountNewRemovableMedia
{
  // FIXME
  return nil;
}

- (NSArray*) mountedRemovableMedia
{
  NSArray		*volumes;
  NSMutableArray	*names;
  unsigned		count;
  unsigned		i;

  volumes = [self mountedLocalVolumePaths];
  count = [volumes count];
  names = [NSMutableArray arrayWithCapacity: count];
  for (i = 0; i < count; i++)
    {
      BOOL	removableFlag;
      BOOL	writableFlag;
      BOOL	unmountableFlag;
      NSString	*description;
      NSString	*fileSystemType;
      NSString	*name = [volumes objectAtIndex: i];

      if ([self getFileSystemInfoForPath: name
			     isRemovable: &removableFlag
			      isWritable: &writableFlag
			   isUnmountable: &unmountableFlag
			     description: &description
				    type: &fileSystemType] && removableFlag)
        {
	  [names addObject: name];
	}
    }

  return names;
}

- (NSArray*) mountedLocalVolumePaths
{
  NSMutableArray	*names;
  NSFileManager		*mgr = [NSFileManager defaultManager];
#ifdef	__MINGW__
  unsigned		max = BUFSIZ;
  unichar		buf[max];
  unichar		*base = buf;
  unichar		*ptr;
  unichar		*end;
  unsigned		len;

  names = [NSMutableArray arrayWithCapacity: 8];
  len = GetLogicalDriveStringsW(max-1, base);
  while (len >= max)
    {
      base = NSZoneMalloc(NSDefaultMallocZone(), (len+1) * sizeof(unichar));
      max = len;
      len = GetLogicalDriveStringsW(max-1, base);
    }
  for (ptr = base; *ptr != 0; ptr = end + 1)
    {
      NSString	*path;

      end = ptr;
      while (*end != 0)
	{
	  end++;
	}
      len = (end - ptr) * sizeof(unichar);
      path = [mgr stringWithFileSystemRepresentation: (char*)ptr length: len];
      [names addObject: path];
    }
  if (base != buf)
    {
      NSZoneFree(NSDefaultMallocZone(), base);
    }

#elif	defined(HAVE_GETMNTENT) && defined (MNT_MEMB)
  FILE		*fptr = fopen("/etc/mtab", "r");
  struct mntent	*m;

  names = [NSMutableArray arrayWithCapacity: 8];
  while ((m = getmntent(fptr)) != 0)
    {
      NSString	*path;

      path = [mgr stringWithFileSystemRepresentation: m->MNT_MEMB
					      length: strlen(m->MNT_MEMB)];
      [names addObject: path];
    }
#else

  // FIXME This is system specific
  NSString	*mtab = [NSString stringWithContentsOfFile: @"/etc/mtab"];
  NSArray	*mounts = [mtab componentsSeparatedByString: @"\n"];
  unsigned int	i;

  names = [NSMutableArray arrayWithCapacity: [mounts count]];
  for (i = 0; i < [mounts count]; i++)
    {
      NSString  *mount = [mounts objectAtIndex: i];
    
      if ([mount length]) 
        {
          NSArray  *parts = [mount componentsSeparatedByString: @" "];
          
          if ([parts count] >= 2) 
            {          
              NSString	*type = [parts objectAtIndex: 2];
              
              if ([type isEqualToString: @"proc"] == NO
	          && [type isEqualToString: @"devpts"] == NO
	          && [type isEqualToString: @"shm"] == NO)
              {
	         [names addObject: [parts objectAtIndex: 1]];
	      }
           }
        }
    }
#endif  
  return names;
}

/**
 * Returns the workspace notification center
 */
- (NSNotificationCenter*) notificationCenter
{
  return _workspaceCenter;
}

/**
 * Simply makes a note that the user defaults database has changed.
 */
- (void) noteUserDefaultsChanged
{
  _userDefaultsChanged = YES;
}

/**
 * Returns a flag to say if the defaults database has changed since
 * the last time this method was called.
 */
- (BOOL) userDefaultsChanged
{
  BOOL	hasChanged = _userDefaultsChanged;

  _userDefaultsChanged = NO;
  return hasChanged;
}

/**
 * Animating an Image- slides it from one point on the screen to another.
 */
- (void) slideImage: (NSImage*)image
	       from: (NSPoint)fromPoint
		 to: (NSPoint)toPoint
{
  [GSCurrentServer() slideImage: image from: fromPoint to: toPoint];
}

/*
 * Requesting Additional Time before Power Off or Logout
 */
- (int) extendPowerOffBy: (int)requested
{
  // FIXME
  return 0;
}

@end

@implementation	NSWorkspace (GNUstep)

/**
 * Returns the 'best' application to open a file with the specified extension
 * using the given role.  If the role is nil then apps which can edit are
 * preferred but viewers are also acceptable.  Uses a user preferred app
 * or picks any good match.
 */
- (NSString*) getBestAppInRole: (NSString*)role
		  forExtension: (NSString*)ext
{
  NSString	*appName = nil;

  if ([self _extension: ext role: role app: &appName] == NO)
    {
      appName = nil;
    }
  return appName;
}

/**
 * Returns the path set for the icon matching the image by
 * -setBestIcon:forExtension:
 */
- (NSString*) getBestIconForExtension: (NSString*)ext
{
  NSString	*iconPath = nil;

  if (extPreferences != nil)
    {
      NSDictionary	*inf;

      inf = [extPreferences objectForKey: [ext lowercaseString]];
      if (inf != nil)
	{
	  iconPath = [inf objectForKey: @"Icon"];
	}
    }
  return iconPath;
}

/**
 * Gets the applications cache (generated by the make_services tool)
 * and looks up the special entry that contains a dictionary of all
 * file extensions recognised by GNUstep applications.  Then finds
 * the dictionary of applications that can handle our file and
 * returns it.
 */
- (NSDictionary*) infoForExtension: (NSString*)ext
{
  NSDictionary  *map;

  ext = [ext lowercaseString];
  map = [applications objectForKey: @"GSExtensionsMap"];
  return [map objectForKey: ext];
}

/**
 * Returns the application bundle for the named application. Accepts
 * either a full path to an app or just the name. The extension (.app,
 * .debug, .profile) is optional, but if provided it will be used.<br />
 * Returns nil if the specified app does not exist as requested.
 */
- (NSBundle*) bundleForApp: (NSString*)appName
{
  if ([appName length] == 0)
    {
      return nil;
    }
  if ([[appName lastPathComponent] isEqual: appName]) // it's a name
    {
      appName = [self fullPathForApplication: appName];
    }
  else
    {
      NSFileManager	*fm;
      NSString		*ext;
      BOOL		flag;

      fm = [NSFileManager defaultManager];
      ext = [appName pathExtension];
      if ([ext length] == 0) // no extension, let's find one
	{
	  NSString	*path;

	  path = [appName stringByAppendingPathExtension: @"app"];
	  if ([fm fileExistsAtPath: path isDirectory: &flag] == NO
	    || flag == NO)
	    {
	      path = [appName stringByAppendingPathExtension: @"debug"];
	      if ([fm fileExistsAtPath: path isDirectory: &flag] == NO
		|| flag == NO)
		{
		  path = [appName stringByAppendingPathExtension: @"profile"];
		}
	    }
	  appName = path;
	}
      if ([fm fileExistsAtPath: appName isDirectory: &flag] == NO
	|| flag == NO)
	{
	  appName = nil;
	}
    }
  if (appName == nil)
    {
      return nil;
    }
  return [NSBundle bundleWithPath: appName];
}

/**
 * Returns the application icon for the given app.
 * Or null if none defined or appName is not a valid application name.
 */
- (NSImage*) appIconForApp: (NSString*)appName
{
  NSBundle *bundle;
  NSImage *image = nil;
  NSFileManager *mgr = [NSFileManager defaultManager];
  NSString *iconPath = nil;
  NSString *fullPath;
  
  fullPath = [self fullPathForApplication: appName];
  bundle = [self bundleForApp: fullPath];
  if (bundle == nil)
    {
      return nil;
    }
  
  iconPath = [[bundle infoDictionary] objectForKey: @"NSIcon"];
  
  if (iconPath && [iconPath isAbsolutePath] == NO)
    {
      NSString *file = iconPath;

      iconPath = [bundle pathForImageResource: file];

      /*
       * If there is no icon in the Resources of the app, try
       * looking directly in the app wrapper.
       */
      if (iconPath == nil)
        {
          iconPath = [fullPath stringByAppendingPathComponent: file];
          if ([mgr isReadableFileAtPath: iconPath] == NO)
            {
              iconPath = nil;
            }
        }
    }
    
  /*
   * If there is no icon specified in the Info.plist for app
   * try 'wrapper/app.tiff'
   */
  if (iconPath == nil)
    {
      NSString *str;

      str = [fullPath lastPathComponent];
      str = [str stringByDeletingPathExtension];
      iconPath = [fullPath stringByAppendingPathComponent: str];
      iconPath = [iconPath stringByAppendingPathExtension: @"tiff"];
      
      if ([mgr isReadableFileAtPath: iconPath] == NO)
        {
          iconPath = nil;
        }
    }
  
  if (iconPath != nil)
    {
      image = [self _saveImageFor: iconPath];
    }
  
  return image;
}

/**
 * Requires the path to an application wrapper as an argument, and returns
 * the full path to the executable.
 */
- (NSString*) locateApplicationBinary: (NSString*)appName
{
  NSString	*path;
  NSString	*file;
  NSBundle	*bundle = [self bundleForApp: appName];

  if (bundle == nil)
    {
      return nil;
    }
  path = [bundle bundlePath];
  file = [[bundle infoDictionary] objectForKey: @"NSExecutable"];

  if (file == nil)
    {
      /*
       * If there is no executable specified in the info property-list, then
       * we expect the executable to reside within the app wrapper and to
       * have the same name as the app wrapper but without the extension.
       */
      file = [path lastPathComponent];
      file = [file stringByDeletingPathExtension];
      path = [path stringByAppendingPathComponent: file];
    }
  else
    {
      /*
       * If there is an executable specified in the info property-list, then
       * it can be either an absolute path, or a path relative to the app
       * wrapper, so we make sure we end up with an absolute path to return.
       */
      if ([file isAbsolutePath] == YES)
	{
	  path = file;
	}
      else
	{
	  path = [path stringByAppendingPathComponent: file];
	}
    }

  return path;
}

/**
 * Sets up a user preference  for which app should be used to open files
 * of the specified extension.
 */
- (void) setBestApp: (NSString*)appName
	     inRole: (NSString*)role
       forExtension: (NSString*)ext
{
  NSMutableDictionary	*map;
  NSMutableDictionary	*inf;
  NSData		*data;

  ext = [ext lowercaseString];
  if (extPreferences != nil)
    map = [extPreferences mutableCopy];
  else
    map = [NSMutableDictionary new];

  inf = [[map objectForKey: ext] mutableCopy];
  if (inf == nil)
    {
      inf = [NSMutableDictionary new];
    }
  if (appName == nil)
    {
      if (role == nil)
	{
	  NSString	*iconPath = [inf objectForKey: @"Icon"];

	  RETAIN(iconPath);
	  [inf removeAllObjects];
	  if (iconPath)
	    {
	      [inf setObject: iconPath forKey: @"Icon"];
	      RELEASE(iconPath);
	    }
	}
      else
	{
	  [inf removeObjectForKey: role];
	}
    }
  else
    {
      [inf setObject: appName forKey: (role ? role : @"Editor")];
    }
  [map setObject: inf forKey: ext];
  RELEASE(inf);
  RELEASE(extPreferences);
  extPreferences = map;
  data = [NSSerializer serializePropertyList: extPreferences];
  [data writeToFile: extPrefPath atomically: YES];
}

/**
 * Sets up a user preference for which icon should be used to
 * represent the specified file extension.
 */
- (void) setBestIcon: (NSString*)iconPath forExtension: (NSString*)ext
{
  NSMutableDictionary	*map;
  NSMutableDictionary	*inf;
  NSData		*data;

  ext = [ext lowercaseString];
  if (extPreferences != nil)
    map = [extPreferences mutableCopy];
  else
    map = [NSMutableDictionary new];

  inf = [[map objectForKey: ext] mutableCopy];
  if (inf == nil)
    inf = [NSMutableDictionary new];
  if (iconPath)
    [inf setObject: iconPath forKey: @"Icon"];
  else
    [inf removeObjectForKey: @"Icon"];
  [map setObject: inf forKey: ext];
  RELEASE(inf);
  RELEASE(extPreferences);
  extPreferences = map;
  data = [NSSerializer serializePropertyList: extPreferences];
  [data writeToFile: extPrefPath atomically: YES];
}

@end

@implementation NSWorkspace (Private)

- (NSImage*) _extIconForApp: (NSString*)appName info: (NSDictionary*)extInfo
{
  NSDictionary	*typeInfo = [extInfo objectForKey: appName];
  NSString	*file = [typeInfo objectForKey: @"NSIcon"];

  if (file && [file length] != 0)
    {
      if ([file isAbsolutePath] == NO)
	{
	  NSString *iconPath;
	  NSBundle *bundle;

	  bundle = [self bundleForApp: appName];
	  iconPath = [bundle pathForImageResource: file];
	  /*
	   * If the icon is not in the Resources of the app, try looking
	   * directly in the app wrapper.
	   */
	  if (iconPath == nil)
	    {
	      iconPath = [[bundle bundlePath]
		stringByAppendingPathComponent: file];
	    }
	  file = iconPath;
	}
      if ([[NSFileManager defaultManager] isReadableFileAtPath: file] == YES)
	{
	  return [self _saveImageFor: file];
	}
    }
  return nil;
}

/** Returns the default icon to display for a file */
- (NSImage*) unknownFiletypeImage
{
  static NSImage *image = nil;

  if (image == nil)
    {
      image = RETAIN([NSImage _standardImageWithName: @"Unknown.tiff"]);
    }

  return image;
}

/** Try to create the image in an exception handling context */
- (NSImage*) _saveImageFor: (NSString*)iconPath
{
  NSImage *tmp = nil;

  NS_DURING
    {
      tmp = [[NSImage alloc] initWithContentsOfFile: iconPath];
      if (tmp != nil)
        {
	  AUTORELEASE(tmp);
	}
    }
  NS_HANDLER
    {
      NSLog(@"BAD TIFF FILE '%@'", iconPath);
    }
  NS_ENDHANDLER

  return tmp;
}

/** Returns the freedesktop thumbnail file name for a given file name */
- (NSString*) thumbnailForFile: (NSString *)file
{
  NSString *absolute;
  NSString *digest;
  NSString *thumbnail;

  absolute = [[NSURL fileURLWithPath: [file stringByStandardizingPath]] 
		 absoluteString];
  // This compensates for a feature we have in NSURL, that is there to have 
  // MacOSX compatibility.
  if ([absolute hasPrefix:  @"file://localhost/"])
    {
      absolute = [@"file:///" stringByAppendingString: 
		       [absolute substringWithRange: 
				     NSMakeRange(17, [absolute length] - 17)]];
    }

  // FIXME: Not sure which encoding to use here. 
  digest = [[[[absolute dataUsingEncoding: NSASCIIStringEncoding]
		 md5Digest] hexadecimalRepresentation] lowercaseString];
  thumbnail = [@"~/.thumbnails/normal" stringByAppendingPathComponent: 
		    [digest stringByAppendingPathExtension: @"png"]];

  return [thumbnail stringByStandardizingPath];
}

- (NSImage*) _iconForExtension: (NSString*)ext
{
  NSImage	*icon = nil;

  if (ext == nil || [ext isEqualToString: @""])
    {
      return nil;
    }
  /*
   * extensions are case-insensitive - convert to lowercase.
   */
  ext = [ext lowercaseString];
  if ((icon = [_iconMap objectForKey: ext]) == nil)
    {
      NSDictionary	*prefs;
      NSDictionary	*extInfo;
      NSString		*iconPath;

      /*
       * If there is a user-specified preference for an image -
       * try to use that one.
       */
      prefs = [extPreferences objectForKey: ext];
      iconPath = [prefs objectForKey: @"Icon"];
      if (iconPath)
	{
	  icon = [self _saveImageFor: iconPath];
	}

      if (icon == nil && (extInfo = [self infoForExtension: ext]) != nil)
	{
	  NSString	*appName;

	  /*
	   * If there are any application preferences given, try to use the
	   * icon for this file that is used by the preferred app.
	   */
	  if (prefs)
	    {
	      if ((appName = [extInfo objectForKey: @"Editor"]) != nil)
		{
		  icon = [self _extIconForApp: appName info: extInfo];
		}
	      if (icon == nil
		&& (appName = [extInfo objectForKey: @"Viewer"]) != nil)
		{
		  icon = [self _extIconForApp: appName info: extInfo];
		}
	    }

	  if (icon == nil)
	    {
	      NSEnumerator	*enumerator;

	      /*
	       * Still no icon - try all the apps that handle this file
	       * extension.
	       */
	      enumerator = [extInfo keyEnumerator];
	      while (icon == nil && (appName = [enumerator nextObject]) != nil)
		{
		  icon = [self _extIconForApp: appName info: extInfo];
		}
	    }
	}

      /*
       * Nothing found at all - use the unknowntype icon.
       */
      if (icon == nil)
	{
	  if ([ext isEqualToString: @"app"] == YES
	    || [ext isEqualToString: @"debug"] == YES
	    || [ext isEqualToString: @"profile"] == YES)
	    {
	      if (unknownApplication == nil)
		{
		  unknownApplication = RETAIN([NSImage _standardImageWithName:
		    @"UnknownApplication.tiff"]);
		}
	      icon = unknownApplication;
	    }
	  else
	    {
	      icon = [self unknownFiletypeImage];
	    }
	}

      /*
       * Set the icon in the cache for next time.
       */
      if (icon != nil)
	{
	  [_iconMap setObject: icon forKey: ext];
	}
    }
  return icon;
}

- (BOOL) _extension: (NSString*)ext
               role: (NSString*)role
	        app: (NSString**)app
{
  NSEnumerator	*enumerator;
  NSString      *appName = nil;
  NSDictionary	*apps = [self infoForExtension: ext];
  NSDictionary	*prefs;
  NSDictionary	*info;

  ext = [ext lowercaseString];

  /*
   *	Look for the name of the preferred app in this role.
   *	A 'nil' roll is a wildcard - find the preferred Editor or Viewer.
   */
  prefs = [extPreferences objectForKey: ext];
  if (role == nil || [role isEqualToString: @"Editor"])
    {
      appName = [prefs objectForKey: @"Editor"];
      if (appName != nil)
	{
	  info = [apps objectForKey: appName];
	  if (info != nil)
	    {
	      if (app != 0)
		{
		  *app = appName;
		}
	      return YES;
	    }
	  else if ([self locateApplicationBinary: appName] != nil)
	    {
	      /*
	       * Return the preferred application even though it doesn't
	       * say it opens this type of file ... preferences overrule.
	       */
	      if (app != 0)
		{
		  *app = appName;
		}
	      return YES;
	    }
	}
    }
  if (role == nil || [role isEqualToString: @"Viewer"])
    {
      appName = [prefs objectForKey: @"Viewer"];
      if (appName != nil)
	{
	  info = [apps objectForKey: appName];
	  if (info != nil)
	    {
	      if (app != 0)
		{
		  *app = appName;
		}
	      return YES;
	    }
	  else if ([self locateApplicationBinary: appName] != nil)
	    {
	      /*
	       * Return the preferred application even though it doesn't
	       * say it opens this type of file ... preferences overrule.
	       */
	      if (app != 0)
		{
		  *app = appName;
		}
	      return YES;
	    }
	}
    }

  /*
   * Go through the dictionary of apps that know about this file type and
   * determine the best application to open the file by examining the
   * type information for each app.
   * The 'NSRole' field specifies what the app can do with the file - if it
   * is missing, we assume an 'Editor' role.
   */
  if (apps == nil || [apps count] == 0)
    {
      return NO;
    }
  enumerator = [apps keyEnumerator];

  if (role == nil)
    {
      BOOL	found = NO;

      /*
       * If the requested role is 'nil', we can accept an app that is either
       * an Editor (preferred) or a Viewer.
       */
      while ((appName = [enumerator nextObject]) != nil)
	{
	  NSString	*str;

	  info = [apps objectForKey: appName];
	  str = [info objectForKey: @"NSRole"];
	  if (str == nil || [str isEqualToString: @"Editor"])
	    {
	      if (app != 0)
		{
		  *app = appName;
		}
	      return YES;
	    }
	  else if ([str isEqualToString: @"Viewer"])
	    {
	      if (app != 0)
		{
		  *app = appName;
		}
	      found = YES;
	    }
	}
      return found;
    }
  else
    {
      while ((appName = [enumerator nextObject]) != nil)
	{
	  NSString	*str;

	  info = [apps objectForKey: appName];
	  str = [info objectForKey: @"NSRole"];
	  if ((str == nil && [role isEqualToString: @"Editor"])
	    || [str isEqualToString: role])
	    {
	      if (app != 0)
		{
		  *app = appName;
		}
	      return YES;
	    }
	}
      return NO;
    }
}

/**
 * Launch an application ... if there is a workspace application, ask it
 * to perform the launch for us.  Otherwise we try to launch the app
 * ourself as long as it is on the same host as we are.
 */
- (BOOL) _launchApplication: (NSString*)appName
		  arguments: (NSArray*)args
{
  id	app = nil;

  // app = [self _workspaceApplication];
  if (app != nil)
    {
      return [app _launchApplication: appName arguments: args];
    }
  else
    {
      NSTask		*task;
      NSString		*path;
      NSDictionary	*userinfo;
      NSString		*host;

      path = [self locateApplicationBinary: appName];
      if (path == nil)
	{
	  return NO;
	}

      /*
       * Try to ensure that apps we launch display in this workspace
       * ie they have the same -NSHost specification.
       */
      host = [[NSUserDefaults standardUserDefaults] stringForKey: @"NSHost"];
      if (host != nil)
	{
	  NSHost	*h;

	  h = [NSHost hostWithName: host];
	  if ([h isEqual: [NSHost currentHost]] == NO)
	    {
	      if ([args containsObject: @"-NSHost"] == NO)
		{
		  NSMutableArray	*a;

		  if (args == nil)
		    {
		      a = [NSMutableArray arrayWithCapacity: 2];
		    }
		  else
		    {
		      a = AUTORELEASE([args mutableCopy]);
		    }
		  [a insertObject: @"-NSHost" atIndex: 0];
		  [a insertObject: host atIndex: 1];
		  args = a;
		}
	    }
	}
      /*
       * App being launched, send
       * NSWorkspaceWillLaunchApplicationNotification
       */
      userinfo = [NSDictionary dictionaryWithObjectsAndKeys:
	[[appName lastPathComponent] stringByDeletingPathExtension], 
			       @"NSApplicationName",
	appName, @"NSApplicationPath",
	nil];
      [_workspaceCenter
	postNotificationName: NSWorkspaceWillLaunchApplicationNotification
	object: self
	userInfo: userinfo];

      task = [NSTask launchedTaskWithLaunchPath: path arguments: args];
      if (task == nil)
	{
	  return NO;
	}
      /*
       * The NSWorkspaceDidLaunchApplicationNotification will be
       * sent by the started application itself.
       */
      [_launched setObject: task forKey: appName];
      return YES;
    }
}

- (id) _connectApplication: (NSString*)appName
{
  NSString	*host;
  NSString	*port;
  NSDate	*when = nil;
  id		app = nil;

  while (app == nil)
    {
      host = [[NSUserDefaults standardUserDefaults] stringForKey: @"NSHost"];
      if (host == nil)
	{
	  host = @"";
	}
      else
	{
	  NSHost	*h;

	  h = [NSHost hostWithName: host];
	  if ([h isEqual: [NSHost currentHost]] == YES)
	    {
	      host = @"";
	    }
	}
      port = [[appName lastPathComponent] stringByDeletingPathExtension];
      /*
       *	Try to contact a running application.
       */
      NS_DURING
	{
	  app = [NSConnection rootProxyForConnectionWithRegisteredName: port  
								  host: host];
	}
      NS_HANDLER
	{
	  /* Fatal error in DO	*/
	  app = nil;
	}
      NS_ENDHANDLER

      if (app == nil)
	{
	  NSTask	*task = [_launched objectForKey: appName];
	  NSDate	*limit;

	  if (task == nil || [task isRunning] == NO)
	    {
	      if (task != nil)	// Not running
		{
		  [_launched removeObjectForKey: appName];
		}
	      break;		// Need to launch the app
	    }

	  if (when == nil)
	    {
	      when = [[NSDate alloc] init];
	    }
	  else if ([when timeIntervalSinceNow] < -5.0)
	    {
	      int		result;

	      DESTROY(when);
	      result = NSRunAlertPanel(appName,
		@"Application seems to have hung",
		@"Continue", @"Terminate", @"Wait");

	      if (result == NSAlertDefaultReturn)
		{
		  break;		// Finished without app
		}
	      else if (result == NSAlertOtherReturn)
		{
		  // Continue to wait for app startup.
		}
	      else
		{
		  [task terminate];
		  [_launched removeObjectForKey: appName];
		  break;		// Terminate hung app
		}
	    }

	  // Give it another 0.5 of a second to start up.
	  limit = [[NSDate alloc] initWithTimeIntervalSinceNow: 0.5];
	  [[NSRunLoop currentRunLoop] runUntilDate: limit];
	  RELEASE(limit);
	}
    }
  TEST_RELEASE(when);
  return app;
}

- (id) _workspaceApplication
{
  NSUserDefaults	*defs = [NSUserDefaults standardUserDefaults];
  NSString		*appName;
  id			app;

  /* What Workspace application? */
  appName = [defs stringForKey: @"GSWorkspaceApplication"];
  if (appName == nil)
    {
      appName = @"GWorkspace";
    }

  app = [self _connectApplication: appName];
  if (app == nil)
    {
      NSString	*host;

      /**
       * We don't use -_launchApplication:arguents: here as that method
       * calls -_workspaceApplication, and would cause recursion.
       */
      host = [[NSUserDefaults standardUserDefaults] stringForKey: @"NSHost"];
      if (host == nil)
	{
	  host = @"";
	}
      else
	{
	  NSHost	*h;

	  h = [NSHost hostWithName: host];
	  if ([h isEqual: [NSHost currentHost]] == YES)
	    {
	      host = @"";
	    }
	}
      /**
       * We can only launch a workspace app if we are displaying to the
       * local host (since if we are displaying on another host we want
       * to to talk to the workspace app on that host too).
       */
      if ([host isEqual: @""] == YES)
	{
	  if ([self _launchApplication: appName arguments: nil] == YES)
	    {
	      app = [self _connectApplication: appName];
	    }
	}
    }

  return app;
}

@end