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/*

 *  R.app : a Cocoa front end to: "R A Computer Language for Statistical Data Analysis"

 *  

 *  R.app Copyright notes:

 *                     Copyright (C) 2004-8  The R Foundation

 *                     written by Stefano M. Iacus and Simon Urbanek

 *

 *                  

 *  R Copyright notes:

 *                     Copyright (C) 1995-1996   Robert Gentleman and Ross Ihaka

 *                     Copyright (C) 1998-2001   The R Development Core Team

 *                     Copyright (C) 2002-2004   The R Foundation

 *

 *  This program is free software; you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License as published by

 *  the Free Software Foundation; either version 2 of the License, or

 *  (at your option) any later version.

 *

 *  This program 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 General Public License for more details.

 *

 *  A copy of the GNU General Public License is available via WWW at

 *  http://www.gnu.org/copyleft/gpl.html.  You can also obtain it by

 *  writing to the Free Software Foundation, Inc., 59 Temple Place,

 *  Suite 330, Boston, MA  02111-1307  USA.

 */

#import "FileCompletion.h"

@implementation FileCompletion

+ (NSArray*) completeAll: (NSString*) part cutPrefix: (int) prefix {

	//NSLog(@"FileCompletion completeAll: '%@' curPrefix: %d", part, prefix);

    int tl = [part length];

    int ls = tl-1, fb;

    NSString *dir = nil;

    BOOL working=NO, voidFn=NO, homeCompletion=NO;

    NSString *fn;

    //NSLog(@"attepted file-completion: \"%@\"", part);

    while (ls>0 && [part characterAtIndex:ls]!='/') ls--; // ls=last / || 0

    if (ls<1 && (tl==0 || [part characterAtIndex:ls]!='/')) {

        working=YES;

		if (tl > 0 && [part characterAtIndex:0]=='~') {

			// this is not easy - stricly speaking we should look for all users

			// but we use a trick: we find our home and strip the last component

			dir = [[@"~" stringByExpandingTildeInPath] stringByDeletingLastPathComponent];

			ls = 1; homeCompletion = YES;

		}

	}

    if (!dir) dir = working?@".":((ls==0)?@"/":[part substringToIndex:ls]);

	if ([dir characterAtIndex:0] == '~') dir = [dir stringByExpandingTildeInPath];

    fb=ls; if (fb<tl && [part characterAtIndex:fb]=='/') fb++;

    fn=(fb>=0 && fb<tl)?[part substringFromIndex:fb]:@"";

	if ([fn length]==0) voidFn=YES;

    //NSLog(@"directory to look in: \"%@\" for entry beginning with \"%@\"", dir, fn);

    {

        NSArray *a = [[NSFileManager defaultManager] directoryContentsAtPath:dir];

        if (a==nil) return nil;

	NSMutableArray *ca = [NSMutableArray arrayWithCapacity: 8];

        { 

            int i=0, matches=0;

            NSString *common=nil;

            while (i<[a count]) {

                NSString *sx = (NSString*) [a objectAtIndex:i];

                if (voidFn || [sx hasPrefix: fn]) {

					BOOL isDir;

					if ([[NSFileManager defaultManager] fileExistsAtPath:[NSString stringWithFormat:@"%@/%@", dir, sx] isDirectory:&isDir] && isDir)

						sx = [sx stringByAppendingString:@"/"];

					if (homeCompletion) sx = [@"~" stringByAppendingString:sx];

                    if (matches==0)

                            common = [[NSString alloc] initWithString: sx];

                    else {

                        NSString *cpref=[[NSString alloc] initWithString:[common commonPrefixWithString:sx options:0]];

                        [common release];

                        common=cpref;

                    }

					[ca addObject: [sx substringFromIndex:prefix]];

                    matches++;

                }

                i++;

            }

	    if (common) [common release];

			return ca; 

        }

    }

    return nil;

}

@end