PBGitIndex.m

   1 //
   2 //  PBGitIndex.m
   3 //  GitX
   4 //
   5 //  Created by Pieter de Bie on 9/12/09.
   6 //  Copyright 2009 Pieter de Bie. All rights reserved.
   7 //
   8
   9 #import "PBGitIndex.h"
  10 #import "PBGitRepository.h"
  11 #import "PBGitBinary.h"
  12 #import "PBEasyPipe.h"
  13 #import "NSString_RegEx.h"
  14 #import "PBChangedFile.h"
  15
  16 NSString *PBGitIndexIndexRefreshStatus = @"PBGitIndexIndexRefreshStatus";
  17 NSString *PBGitIndexIndexRefreshFailed = @"PBGitIndexIndexRefreshFailed";
  18 NSString *PBGitIndexFinishedIndexRefresh = @"PBGitIndexFinishedIndexRefresh";
  19
  20 NSString *PBGitIndexIndexUpdated = @"GBGitIndexIndexUpdated";
  21
  22 NSString *PBGitIndexCommitStatus = @"PBGitIndexCommitStatus";
  23 NSString *PBGitIndexCommitFailed = @"PBGitIndexCommitFailed";
  24 NSString *PBGitIndexFinishedCommit = @"PBGitIndexFinishedCommit";
  25
  26 NSString *PBGitIndexAmendMessageAvailable = @"PBGitIndexAmendMessageAvailable";
  27 NSString *PBGitIndexOperationFailed = @"PBGitIndexOperationFailed";
  28
  29 @interface PBGitIndex (IndexRefreshMethods)
  30
  31 - (NSArray *)linesFromNotification:(NSNotification *)notification;
  32 - (NSMutableDictionary *)dictionaryForLines:(NSArray *)lines;
  33 - (void)addFilesFromDictionary:(NSMutableDictionary *)dictionary staged:(BOOL)staged tracked:(BOOL)tracked;
  34
  35 - (void)indexStepComplete;
  36
  37 - (void)indexRefreshFinished:(NSNotification *)notification;
  38 - (void)readOtherFiles:(NSNotification *)notification;
  39 - (void)readUnstagedFiles:(NSNotification *)notification;
  40 - (void)readStagedFiles:(NSNotification *)notification;
  41
  42 @end
  43
  44 @interface PBGitIndex ()
  45
  46 // Returns the tree to compare the index to, based
  47 // on whether amend is set or not.
  48 - (NSString *) parentTree;
  49 - (void)postCommitUpdate:(NSString *)update;
  50 - (void)postCommitFailure:(NSString *)reason;
  51 - (void)postIndexChange;
  52 - (void)postOperationFailed:(NSString *)description;
  53 @end
  54
  55 @implementation PBGitIndex
  56
  57 @synthesize amend;
  58
  59 - (id)initWithRepository:(PBGitRepository *)theRepository workingDirectory:(NSURL *)theWorkingDirectory
  60 {
  61         if (!(self = [super init]))
  62                 return nil;
  63
  64         NSAssert(theWorkingDirectory, @"PBGitIndex requires a working directory");
  65         NSAssert(theRepository, @"PBGitIndex requires a repository");
  66
  67         repository = theRepository;
  68         workingDirectory = theWorkingDirectory;
  69         files = [NSMutableArray array];
  70
  71         return self;
  72 }
  73
  74 - (NSArray *)indexChanges
  75 {
  76         return files;
  77 }
  78
  79 - (void)setAmend:(BOOL)newAmend
  80 {
  81         if (newAmend == amend)
  82                 return;
  83
  84         amend = newAmend;
  85         amendEnvironment = nil;
  86
  87         [self refresh];
  88
  89         if (!newAmend)
  90                 return;
  91
  92         // If we amend, we want to keep the author information for the previous commit
  93         // We do this by reading in the previous commit, and storing the information
  94         // in a dictionary. This dictionary will then later be read by [self commit:]
  95         NSString *message = [repository outputForCommand:@"cat-file commit HEAD"];
  96         NSArray *match = [message substringsMatchingRegularExpression:@"\nauthor ([^\n]*) <([^\n>]*)> ([0-9]+[^\n]*)\n" count:3 options:0 ranges:nil error:nil];
  97         if (match)
  98                 amendEnvironment = [NSDictionary dictionaryWithObjectsAndKeys:[match objectAtIndex:1], @"GIT_AUTHOR_NAME",
  99                                                         [match objectAtIndex:2], @"GIT_AUTHOR_EMAIL",
 100                                                         [match objectAtIndex:3], @"GIT_AUTHOR_DATE",
 101                                                         nil];
 102
 103         // Find the commit message
 104         NSRange r = [message rangeOfString:@"\n\n"];
 105         if (r.location != NSNotFound) {
 106                 NSString *commitMessage = [message substringFromIndex:r.location + 2];
 107                 [[NSNotificationCenter defaultCenter] postNotificationName:PBGitIndexAmendMessageAvailable
 108                                                                                                                         object: self
 109                                                                                                                   userInfo:[NSDictionary dictionaryWithObject:commitMessage forKey:@"message"]];
 110         }
 111
 112 }
 113
 114 - (void)refresh
 115 {
 116         // If we were already refreshing the index, we don't want
 117         // double notifications. As we can't stop the tasks anymore,
 118         // just cancel the notifications
 119         refreshStatus = 0;
 120         NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
 121         [nc removeObserver:self];
 122
 123         // Ask Git to refresh the index
 124         NSFileHandle *updateHandle = [PBEasyPipe handleForCommand:[PBGitBinary path]
 125                                                                                                          withArgs:[NSArray arrayWithObjects:@"update-index", @"-q", @"--unmerged", @"--ignore-missing", @"--refresh", nil]
 126                                                                                                                 inDir:[workingDirectory path]];
 127
 128         [nc addObserver:self
 129                    selector:@selector(indexRefreshFinished:)
 130                            name:NSFileHandleReadToEndOfFileCompletionNotification
 131                          object:updateHandle];
 132         [updateHandle readToEndOfFileInBackgroundAndNotify];
 133
 134 }
 135
 136 - (NSString *) parentTree
 137 {
 138         NSString *parent = amend ? @"HEAD^" : @"HEAD";
 139
 140         if (![repository parseReference:parent])
 141                 // We don't have a head ref. Return the empty tree.
 142                 return @"4b825dc642cb6eb9a060e54bf8d69288fbee4904";
 143
 144         return parent;
 145 }
 146
 147 // TODO: make Asynchronous
 148 - (void)commitWithMessage:(NSString *)commitMessage
 149 {
 150         NSMutableString *commitSubject = [@"commit: " mutableCopy];
 151         NSRange newLine = [commitMessage rangeOfString:@"\n"];
 152         if (newLine.location == NSNotFound)
 153                 [commitSubject appendString:commitMessage];
 154         else
 155                 [commitSubject appendString:[commitMessage substringToIndex:newLine.location]];
 156
 157         NSString *commitMessageFile;
 158         commitMessageFile = [repository.fileURL.path stringByAppendingPathComponent:@"COMMIT_EDITMSG"];
 159
 160         [commitMessage writeToFile:commitMessageFile atomically:YES encoding:NSUTF8StringEncoding error:nil];
 161
 162
 163         [self postCommitUpdate:@"Creating tree"];
 164         NSString *tree = [repository outputForCommand:@"write-tree"];
 165         if ([tree length] != 40)
 166                 return [self postCommitFailure:@"Creating tree failed"];
 167
 168
 169         NSMutableArray *arguments = [NSMutableArray arrayWithObjects:@"commit-tree", tree, nil];
 170         NSString *parent = amend ? @"HEAD^" : @"HEAD";
 171         if ([repository parseReference:parent]) {
 172                 [arguments addObject:@"-p"];
 173                 [arguments addObject:parent];
 174         }
 175
 176         [self postCommitUpdate:@"Creating commit"];
 177         int ret = 1;
 178         NSString *commit = [repository outputForArguments:arguments
 179                                                                                   inputString:commitMessage
 180                                                            byExtendingEnvironment:amendEnvironment
 181                                                                                          retValue: &ret];
 182
 183         if (ret || [commit length] != 40)
 184                 return [self postCommitFailure:@"Could not create a commit object"];
 185
 186         [self postCommitUpdate:@"Running hooks"];
 187         if (![repository executeHook:@"pre-commit" output:nil])
 188                 return [self postCommitFailure:@"Pre-commit hook failed"];
 189
 190         if (![repository executeHook:@"commit-msg" withArgs:[NSArray arrayWithObject:commitMessageFile] output:nil])
 191                 return [self postCommitFailure:@"Commit-msg hook failed"];
 192
 193         [self postCommitUpdate:@"Updating HEAD"];
 194         [repository outputForArguments:[NSArray arrayWithObjects:@"update-ref", @"-m", commitSubject, @"HEAD", commit, nil]
 195                                                   retValue: &ret];
 196         if (ret)
 197                 return [self postCommitFailure:@"Could not update HEAD"];
 198
 199         [self postCommitUpdate:@"Running post-commit hook"];
 200
 201         BOOL success = [repository executeHook:@"post-commit" output:nil];
 202         NSMutableDictionary *userInfo = [NSMutableDictionary dictionaryWithObject:[NSNumber numberWithBool:success] forKey:@"success"];
 203         NSString *description;
 204         if (success)
 205                 description = [NSString stringWithFormat:@"Successfull created commit %@", commit];
 206         else
 207                 description = [NSString stringWithFormat:@"Post-commit hook failed, but successfully created commit %@", commit];
 208
 209         [userInfo setObject:description forKey:@"description"];
 210         [userInfo setObject:commit forKey:@"sha"];
 211
 212         [[NSNotificationCenter defaultCenter] postNotificationName:PBGitIndexFinishedCommit
 213                                                                                                                 object:self
 214                                                                                                           userInfo:userInfo];
 215         if (!success)
 216                 return;
 217
 218         repository.hasChanged = YES;
 219
 220         amendEnvironment = nil;
 221         if (amend)
 222                 self.amend = NO;
 223         else
 224                 [self refresh];
 225
 226 }
 227
 228 - (void)postCommitUpdate:(NSString *)update
 229 {
 230         [[NSNotificationCenter defaultCenter] postNotificationName:PBGitIndexCommitStatus
 231                                                                                                         object:self
 232                                                                                                           userInfo:[NSDictionary dictionaryWithObject:update forKey:@"description"]];
 233 }
 234
 235 - (void)postCommitFailure:(NSString *)reason
 236 {
 237         [[NSNotificationCenter defaultCenter] postNotificationName:PBGitIndexCommitFailed
 238                                                                                                                 object:self
 239                                                                                                           userInfo:[NSDictionary dictionaryWithObject:reason forKey:@"description"]];
 240 }
 241
 242 - (void)postOperationFailed:(NSString *)description
 243 {
 244         [[NSNotificationCenter defaultCenter] postNotificationName:PBGitIndexOperationFailed
 245                                                                                                                 object:self
 246                                                                                                           userInfo:[NSDictionary dictionaryWithObject:description forKey:@"description"]];
 247 }
 248
 249 - (BOOL)stageFiles:(NSArray *)stageFiles
 250 {
 251         // Input string for update-index
 252         // This will be a list of filenames that
 253         // should be updated. It's similar to
 254         // "git add -- <files>
 255         NSMutableString *input = [NSMutableString string];
 256
 257         for (PBChangedFile *file in stageFiles) {
 258                 [input appendFormat:@"%@\0", file.path];
 259         }
 260
 261         int ret = 1;
 262         [repository outputForArguments:[NSArray arrayWithObjects:@"update-index", @"--add", @"--remove", @"-z", @"--stdin", nil]
 263                                            inputString:input
 264                                                   retValue:&ret];
 265
 266         if (ret) {
 267                 [self postOperationFailed:[NSString stringWithFormat:@"Error in staging files. Return value: %i", ret]];
 268                 return NO;
 269         }
 270
 271         for (PBChangedFile *file in stageFiles)
 272         {
 273                 file.hasUnstagedChanges = NO;
 274                 file.hasStagedChanges = YES;
 275         }
 276
 277         [self postIndexChange];
 278         return YES;
 279 }
 280
 281 // TODO: Refactor with above. What's a better name for this?
 282 - (BOOL)unstageFiles:(NSArray *)unstageFiles
 283 {
 284         NSMutableString *input = [NSMutableString string];
 285
 286         for (PBChangedFile *file in unstageFiles) {
 287                 [input appendString:[file indexInfo]];
 288         }
 289
 290         int ret = 1;
 291         [repository outputForArguments:[NSArray arrayWithObjects:@"update-index", @"-z", @"--index-info", nil]
 292                                            inputString:input
 293                                                   retValue:&ret];
 294
 295         if (ret)
 296         {
 297                 [self postOperationFailed:[NSString stringWithFormat:@"Error in unstaging files. Return value: %i", ret]];
 298                 return NO;
 299         }
 300
 301         for (PBChangedFile *file in unstageFiles)
 302         {
 303                 file.hasUnstagedChanges = YES;
 304                 file.hasStagedChanges = NO;
 305         }
 306
 307         [self postIndexChange];
 308         return YES;
 309 }
 310
 311 - (void)discardChangesForFiles:(NSArray *)discardFiles
 312 {
 313         NSArray *paths = [discardFiles valueForKey:@"path"];
 314         NSString *input = [paths componentsJoinedByString:@"\0"];
 315
 316         NSArray *arguments = [NSArray arrayWithObjects:@"checkout-index", @"--index", @"--quiet", @"--force", @"-z", @"--stdin", nil];
 317
 318         int ret = 1;
 319         [PBEasyPipe outputForCommand:[PBGitBinary path] withArgs:arguments inDir:[workingDirectory path] inputString:input retValue:&ret];
 320
 321         if (ret) {
 322                 [self postOperationFailed:[NSString stringWithFormat:@"Discarding changes failed with return value %i", ret]];
 323                 return;
 324         }
 325
 326         for (PBChangedFile *file in discardFiles)
 327                 file.hasUnstagedChanges = NO;
 328
 329         [self postIndexChange];
 330 }
 331
 332 - (BOOL)applyPatch:(NSString *)hunk stage:(BOOL)stage reverse:(BOOL)reverse;
 333 {
 334         NSMutableArray *array = [NSMutableArray arrayWithObjects:@"apply", nil];
 335         if (stage)
 336                 [array addObject:@"--cached"];
 337         if (reverse)
 338                 [array addObject:@"--reverse"];
 339
 340         int ret = 1;
 341         NSString *error = [repository outputForArguments:array
 342                                                                                  inputString:hunk
 343                                                                                         retValue:&ret];
 344
 345         if (ret) {
 346                 [self postOperationFailed:[NSString stringWithFormat:@"Applying patch failed with return value %i. Error: %@", ret, error]];
 347                 return NO;
 348         }
 349
 350         // TODO: Try to be smarter about what to refresh
 351         [self refresh];
 352         return YES;
 353 }
 354
 355
 356 - (NSString *)diffForFile:(PBChangedFile *)file staged:(BOOL)staged contextLines:(NSUInteger)context
 357 {
 358         NSString *parameter = [NSString stringWithFormat:@"-U%u", context];
 359         if (staged) {
 360                 NSString *indexPath = [@":0:" stringByAppendingString:file.path];
 361
 362                 if (file.status == NEW)
 363                         return [repository outputForArguments:[NSArray arrayWithObjects:@"show", indexPath, nil]];
 364
 365                 return [repository outputInWorkdirForArguments:[NSArray arrayWithObjects:@"diff-index", parameter, @"--cached", [self parentTree], @"--", file.path, nil]];
 366         }
 367
 368         // unstaged
 369         if (file.status == NEW) {
 370                 NSStringEncoding encoding;
 371                 NSError *error = nil;
 372                 NSString *path = [[repository workingDirectory] stringByAppendingPathComponent:file.path];
 373                 NSString *contents = [NSString stringWithContentsOfFile:path
 374                                                                                                    usedEncoding:&encoding
 375                                                                                                                   error:&error];
 376                 if (error)
 377                         return nil;
 378
 379                 return contents;
 380         }
 381
 382         return [repository outputInWorkdirForArguments:[NSArray arrayWithObjects:@"diff-files", parameter, @"--", file.path, nil]];
 383 }
 384
 385 - (void)postIndexChange
 386 {
 387         [[NSNotificationCenter defaultCenter] postNotificationName:PBGitIndexIndexUpdated
 388                                                                                                                 object:self];
 389 }
 390
 391 # pragma mark WebKit Accessibility
 392
 393 + (BOOL)isSelectorExcludedFromWebScript:(SEL)aSelector
 394 {
 395         return NO;
 396 }
 397
 398 @end
 399
 400 @implementation PBGitIndex (IndexRefreshMethods)
 401
 402 - (void)indexRefreshFinished:(NSNotification *)notification
 403 {
 404         if ([(NSNumber *)[(NSDictionary *)[notification userInfo] objectForKey:@"NSFileHandleError"] intValue])
 405         {
 406                 [[NSNotificationCenter defaultCenter] postNotificationName:PBGitIndexIndexRefreshFailed
 407                                                                                                                         object:self
 408                                                                                                                   userInfo:[NSDictionary dictionaryWithObject:@"update-index failed" forKey:@"description"]];
 409                 return;
 410         }
 411
 412         [[NSNotificationCenter defaultCenter] postNotificationName:PBGitIndexIndexRefreshStatus
 413                                                                                                                 object:self
 414                                                                                                           userInfo:[NSDictionary dictionaryWithObject:@"update-index success" forKey:@"description"]];
 415
 416         // Now that the index is refreshed, we need to read the information from the index
 417         NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
 418
 419         // Other files (not tracked, not ignored)
 420         refreshStatus++;
 421         NSFileHandle *handle = [PBEasyPipe handleForCommand:[PBGitBinary path]
 422                                                                                            withArgs:[NSArray arrayWithObjects:@"ls-files", @"--others", @"--exclude-standard", @"-z", nil]
 423                                                                                                   inDir:[workingDirectory path]];
 424         [nc addObserver:self selector:@selector(readOtherFiles:) name:NSFileHandleReadToEndOfFileCompletionNotification object:handle];
 425         [handle readToEndOfFileInBackgroundAndNotify];
 426
 427         // Unstaged files
 428         refreshStatus++;
 429         handle = [PBEasyPipe handleForCommand:[PBGitBinary path]
 430                                                                                            withArgs:[NSArray arrayWithObjects:@"diff-files", @"-z", nil]
 431                                                                                                   inDir:[workingDirectory path]];
 432         [nc addObserver:self selector:@selector(readUnstagedFiles:) name:NSFileHandleReadToEndOfFileCompletionNotification object:handle];
 433         [handle readToEndOfFileInBackgroundAndNotify];
 434
 435         // Staged files
 436         refreshStatus++;
 437         handle = [PBEasyPipe handleForCommand:[PBGitBinary path]
 438                                                                  withArgs:[NSArray arrayWithObjects:@"diff-index", @"--cached", @"-z", [self parentTree], nil]
 439                                                                         inDir:[workingDirectory path]];
 440         [nc addObserver:self selector:@selector(readStagedFiles:) name:NSFileHandleReadToEndOfFileCompletionNotification object:handle];
 441         [handle readToEndOfFileInBackgroundAndNotify];
 442 }
 443
 444 - (void)readOtherFiles:(NSNotification *)notification
 445 {
 446         NSArray *lines = [self linesFromNotification:notification];
 447         NSMutableDictionary *dictionary = [[NSMutableDictionary alloc] initWithCapacity:[lines count]];
 448         // Other files are untracked, so we don't have any real index information. Instead, we can just fake it.
 449         // The line below is not used at all, as for these files the commitBlob isn't set
 450         NSArray *fileStatus = [NSArray arrayWithObjects:@":000000", @"100644", @"0000000000000000000000000000000000000000", @"0000000000000000000000000000000000000000", @"A", nil];
 451         for (NSString *path in lines) {
 452                 if ([path length] == 0)
 453                         continue;
 454                 [dictionary setObject:fileStatus forKey:path];
 455         }
 456
 457         [self addFilesFromDictionary:dictionary staged:NO tracked:NO];
 458         [self indexStepComplete];
 459 }
 460
 461 - (void) readStagedFiles:(NSNotification *)notification
 462 {
 463         NSArray *lines = [self linesFromNotification:notification];
 464         NSMutableDictionary *dic = [self dictionaryForLines:lines];
 465         [self addFilesFromDictionary:dic staged:YES tracked:YES];
 466         [self indexStepComplete];
 467 }
 468
 469 - (void) readUnstagedFiles:(NSNotification *)notification
 470 {
 471         NSArray *lines = [self linesFromNotification:notification];
 472         NSMutableDictionary *dic = [self dictionaryForLines:lines];
 473         [self addFilesFromDictionary:dic staged:NO tracked:YES];
 474         [self indexStepComplete];
 475 }
 476
 477 - (void) addFilesFromDictionary:(NSMutableDictionary *)dictionary staged:(BOOL)staged tracked:(BOOL)tracked
 478 {
 479         // Iterate over all existing files
 480         for (PBChangedFile *file in files) {
 481                 NSArray *fileStatus = [dictionary objectForKey:file.path];
 482                 // Object found, this is still a cached / uncached thing
 483                 if (fileStatus) {
 484                         if (tracked) {
 485                                 NSString *mode = [[fileStatus objectAtIndex:0] substringFromIndex:1];
 486                                 NSString *sha = [fileStatus objectAtIndex:2];
 487                                 file.commitBlobSHA = sha;
 488                                 file.commitBlobMode = mode;
 489
 490                                 if (staged)
 491                                         file.hasStagedChanges = YES;
 492                                 else
 493                                         file.hasUnstagedChanges = YES;
 494                                 if ([[fileStatus objectAtIndex:4] isEqualToString:@"D"])
 495                                         file.status = DELETED;
 496                         } else {
 497                                 // Untracked file, set status to NEW, only unstaged changes
 498                                 file.hasStagedChanges = NO;
 499                                 file.hasUnstagedChanges = YES;
 500                                 file.status = NEW;
 501                         }
 502
 503                         // We handled this file, remove it from the dictionary
 504                         [dictionary removeObjectForKey:file.path];
 505                 } else {
 506                         // Object not found in the dictionary, so let's reset its appropriate
 507                         // change (stage or untracked) if necessary.
 508
 509                         // Staged dictionary, so file does not have staged changes
 510                         if (staged)
 511                                 file.hasStagedChanges = NO;
 512                         // Tracked file does not have unstaged changes, file is not new,
 513                         // so we can set it to No. (If it would be new, it would not
 514                         // be in this dictionary, but in the "other dictionary").
 515                         else if (tracked && file.status != NEW)
 516                                 file.hasUnstagedChanges = NO;
 517                         // Unstaged, untracked dictionary ("Other" files), and file
 518                         // is indicated as new (which would be untracked), so let's
 519                         // remove it
 520                         else if (!tracked && file.status == NEW)
 521                                 file.hasUnstagedChanges = NO;
 522                 }
 523         }
 524
 525         // Do new files only if necessary
 526         if (![[dictionary allKeys] count])
 527                 return;
 528
 529         // All entries left in the dictionary haven't been accounted for
 530         // above, so we need to add them to the "files" array
 531         [self willChangeValueForKey:@"indexChanges"];
 532         for (NSString *path in [dictionary allKeys]) {
 533                 NSArray *fileStatus = [dictionary objectForKey:path];
 534
 535                 PBChangedFile *file = [[PBChangedFile alloc] initWithPath:path];
 536                 if ([[fileStatus objectAtIndex:4] isEqualToString:@"D"])
 537                         file.status = DELETED;
 538                 else if([[fileStatus objectAtIndex:0] isEqualToString:@":000000"])
 539                         file.status = NEW;
 540                 else
 541                         file.status = MODIFIED;
 542
 543                 if (tracked) {
 544                         file.commitBlobMode = [[fileStatus objectAtIndex:0] substringFromIndex:1];
 545                         file.commitBlobSHA = [fileStatus objectAtIndex:2];
 546                 }
 547
 548                 file.hasStagedChanges = staged;
 549                 file.hasUnstagedChanges = !staged;
 550
 551                 [files addObject:file];
 552         }
 553         [self didChangeValueForKey:@"indexChanges"];
 554 }
 555
 556 # pragma mark Utility methods
 557 - (NSArray *)linesFromNotification:(NSNotification *)notification
 558 {
 559         NSData *data = [[notification userInfo] valueForKey:NSFileHandleNotificationDataItem];
 560         if (!data)
 561                 return [NSArray array];
 562
 563         NSString *string = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
 564         // FIXME: throw an error?
 565         if (!string)
 566                 return [NSArray array];
 567
 568         // Strip trailing null
 569         if ([string hasSuffix:@"\0"])
 570                 string = [string substringToIndex:[string length]-1];
 571
 572         if ([string length] == 0)
 573                 return [NSArray array];
 574
 575         return [string componentsSeparatedByString:@"\0"];
 576 }
 577
 578 - (NSMutableDictionary *)dictionaryForLines:(NSArray *)lines
 579 {
 580         NSMutableDictionary *dictionary = [NSMutableDictionary dictionaryWithCapacity:[lines count]/2];
 581
 582         // Fill the dictionary with the new information. These lines are in the form of:
 583         // :00000 :0644 OTHER INDEX INFORMATION
 584         // Filename
 585
 586         NSAssert1([lines count] % 2 == 0, @"Lines must have an even number of lines: %@", lines);
 587
 588         NSEnumerator *enumerator = [lines objectEnumerator];
 589         NSString *fileStatus;
 590         while (fileStatus = [enumerator nextObject]) {
 591                 NSString *fileName = [enumerator nextObject];
 592                 [dictionary setObject:[fileStatus componentsSeparatedByString:@" "] forKey:fileName];
 593         }
 594
 595         return dictionary;
 596 }
 597
 598 // This method is called for each of the three processes from above.
 599 // If all three are finished (self.busy == 0), then we can delete
 600 // all files previously marked as deletable
 601 - (void)indexStepComplete
 602 {
 603         // if we're still busy, do nothing :)
 604         if (--refreshStatus) {
 605                 [self postIndexChange];
 606                 return;
 607         }
 608
 609         // At this point, all index operations have finished.
 610         // We need to find all files that don't have either
 611         // staged or unstaged files, and delete them
 612
 613         NSMutableArray *deleteFiles = [NSMutableArray array];
 614         for (PBChangedFile *file in files) {
 615                 if (!file.hasStagedChanges && !file.hasUnstagedChanges)
 616                         [deleteFiles addObject:file];
 617         }
 618
 619         if ([deleteFiles count]) {
 620                 [self willChangeValueForKey:@"indexChanges"];
 621                 for (PBChangedFile *file in deleteFiles)
 622                         [files removeObject:file];
 623                 [self didChangeValueForKey:@"indexChanges"];
 624         }
 625
 626         [[NSNotificationCenter defaultCenter] postNotificationName:PBGitIndexFinishedIndexRefresh
 627                                                                                                                 object:self];
 628         [self postIndexChange];
 629
 630 }
 631
 632 @end