src/TortoiseProc/GitDiff.cpp

   1 // TortoiseGit - a Windows shell extension for easy version control
   2
   3 // Copyright (C) 2003-2008 - TortoiseSVN
   4 // Copyright (C) 2008-2014 - TortoiseGit
   5
   6 // This program is free software; you can redistribute it and/or
   7 // modify it under the terms of the GNU General Public License
   8 // as published by the Free Software Foundation; either version 2
   9 // of the License, or (at your option) any later version.
  10
  11 // This program is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License
  17 // along with this program; if not, write to the Free Software Foundation,
  18 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19 #include "stdafx.h"
  20 #include "GitDiff.h"
  21 #include "AppUtils.h"
  22 #include "Git.h"
  23 #include "gittype.h"
  24 #include "resource.h"
  25 #include "MessageBox.h"
  26 #include "FileDiffDlg.h"
  27 #include "SubmoduleDiffDlg.h"
  28
  29 CGitDiff::CGitDiff(void)
  30 {
  31 }
  32
  33 CGitDiff::~CGitDiff(void)
  34 {
  35 }
  36 int CGitDiff::SubmoduleDiffNull(const CTGitPath * pPath, const git_revnum_t &rev1)
  37 {
  38         CString oldhash = GIT_REV_ZERO;
  39         CString oldsub ;
  40         CString newsub;
  41         CString newhash;
  42
  43         CString cmd;
  44         if (rev1 != GIT_REV_ZERO)
  45                 cmd.Format(_T("git.exe ls-tree \"%s\" -- \"%s\""), rev1, pPath->GetGitPathString());
  46         else
  47                 cmd.Format(_T("git.exe ls-files -s -- \"%s\""), pPath->GetGitPathString());
  48
  49         CString output, err;
  50         if (g_Git.Run(cmd, &output, &err, CP_UTF8))
  51         {
  52                 CMessageBox::Show(NULL, output + L"\n" + err, _T("TortoiseGit"), MB_OK|MB_ICONERROR);
  53                 return -1;
  54         }
  55
  56         int start=0;
  57         start=output.Find(_T(' '),start);
  58         if(start>0)
  59         {
  60                 if (rev1 != GIT_REV_ZERO) // in ls-files the hash is in the second column; in ls-tree it's in the third one
  61                         start = output.Find(_T(' '), start + 1);
  62                 if(start>0)
  63                         newhash=output.Mid(start+1, 40);
  64
  65                 CGit subgit;
  66                 subgit.m_CurrentDir = g_Git.CombinePath(pPath);
  67                 int encode=CAppUtils::GetLogOutputEncode(&subgit);
  68
  69                 cmd.Format(_T("git.exe log -n1  --pretty=format:\"%%s\" %s --"), newhash);
  70                 bool toOK = !subgit.Run(cmd,&newsub,encode);
  71
  72                 bool dirty = false;
  73                 if (rev1 == GIT_REV_ZERO)
  74                 {
  75                         CString dirtyList;
  76                         subgit.Run(_T("git.exe status --porcelain"), &dirtyList, encode);
  77                         dirty = !dirtyList.IsEmpty();
  78                 }
  79
  80                 CSubmoduleDiffDlg submoduleDiffDlg;
  81                 submoduleDiffDlg.SetDiff(pPath->GetWinPath(), false, oldhash, oldsub, true, newhash, newsub, toOK, dirty, NewSubmodule);
  82                 submoduleDiffDlg.DoModal();
  83                 if (submoduleDiffDlg.IsRefresh())
  84                         return 1;
  85
  86                 return 0;
  87         }
  88
  89         if (rev1 != GIT_REV_ZERO)
  90                 CMessageBox::Show(NULL, _T("ls-tree output format error"), _T("TortoiseGit"), MB_OK | MB_ICONERROR);
  91         else
  92                 CMessageBox::Show(NULL, _T("ls-files output format error"), _T("TortoiseGit"), MB_OK | MB_ICONERROR);
  93         return -1;
  94 }
  95
  96 int CGitDiff::DiffNull(const CTGitPath *pPath, git_revnum_t rev1, bool bIsAdd, int jumpToLine)
  97 {
  98         CString temppath;
  99         GetTempPath(temppath);
 100         if (rev1 != GIT_REV_ZERO)
 101         {
 102                 CGitHash rev1Hash;
 103                 if (g_Git.GetHash(rev1Hash, rev1)) // make sure we have a HASH here, otherwise filenames might be invalid
 104                 {
 105                         MessageBox(NULL, g_Git.GetGitLastErr(_T("Could not get hash of \"") + rev1 + _T("\".")), _T("TortoiseGit"), MB_ICONERROR);
 106                         return -1;
 107                 }
 108                 rev1 = rev1Hash.ToString();
 109         }
 110         CString file1;
 111         CString nullfile;
 112         CString cmd;
 113
 114         if(pPath->IsDirectory())
 115         {
 116                 int result;
 117                 // refresh if result = 1
 118                 CTGitPath path = *pPath;
 119                 while ((result = SubmoduleDiffNull(&path, rev1)) == 1)
 120                 {
 121                         path.SetFromGit(pPath->GetGitPathString());
 122                 }
 123                 return result;
 124         }
 125
 126         if(rev1 != GIT_REV_ZERO )
 127         {
 128                 TCHAR szTempName[MAX_PATH] = {0};
 129                 GetTempFileName(temppath, pPath->GetBaseFilename(), 0, szTempName);
 130                 CString temp(szTempName);
 131                 DeleteFile(szTempName);
 132                 CreateDirectory(szTempName, NULL);
 133                 file1.Format(_T("%s\\%s-%s%s"),
 134                                 temp,
 135                                 pPath->GetBaseFilename(),
 136                                 rev1.Left(g_Git.GetShortHASHLength()),
 137                                 pPath->GetFileExtension());
 138
 139                 if (g_Git.GetOneFile(rev1, *pPath, file1))
 140                 {
 141                         CString out;
 142                         out.Format(IDS_STATUSLIST_CHECKOUTFILEFAILED, pPath->GetGitPathString(), rev1, file1);
 143                         CMessageBox::Show(nullptr, g_Git.GetGitLastErr(out, CGit::GIT_CMD_GETONEFILE), _T("TortoiseGit"), MB_OK);
 144                         return -1;
 145                 }
 146         }
 147         else
 148         {
 149                 file1 = g_Git.CombinePath(pPath);
 150         }
 151
 152         // preserve FileExtension, needed especially for diffing deleted images (detection on new filename extension)
 153         CString tempfile=::GetTempFile() + pPath->GetFileExtension();
 154         CStdioFile file(tempfile,CFile::modeReadWrite|CFile::modeCreate );
 155         //file.WriteString();
 156         file.Close();
 157         ::SetFileAttributes(tempfile, FILE_ATTRIBUTE_READONLY);
 158
 159         CAppUtils::DiffFlags flags;
 160
 161         if(bIsAdd)
 162                 CAppUtils::StartExtDiff(tempfile,file1,
 163                                                         pPath->GetGitPathString(),
 164                                                         pPath->GetGitPathString() + _T(":") + rev1.Left(g_Git.GetShortHASHLength()),
 165                                                         g_Git.CombinePath(pPath), g_Git.CombinePath(pPath),
 166                                                         git_revnum_t(GIT_REV_ZERO), rev1
 167                                                         , flags, jumpToLine);
 168         else
 169                 CAppUtils::StartExtDiff(file1,tempfile,
 170                                                         pPath->GetGitPathString() + _T(":") + rev1.Left(g_Git.GetShortHASHLength()),
 171                                                         pPath->GetGitPathString(),
 172                                                         g_Git.CombinePath(pPath), g_Git.CombinePath(pPath),
 173                                                         rev1, git_revnum_t(GIT_REV_ZERO)
 174                                                         , flags, jumpToLine);
 175
 176         return 0;
 177 }
 178
 179 int CGitDiff::SubmoduleDiff(const CTGitPath * pPath, const CTGitPath * /*pPath2*/, const git_revnum_t &rev1, const git_revnum_t &rev2, bool /*blame*/, bool /*unified*/)
 180 {
 181         CString oldhash;
 182         CString newhash;
 183         bool dirty = false;
 184         CString cmd;
 185         bool isWorkingCopy = false;
 186         if( rev2 == GIT_REV_ZERO || rev1 == GIT_REV_ZERO )
 187         {
 188                 oldhash = GIT_REV_ZERO;
 189                 newhash = GIT_REV_ZERO;
 190
 191                 CString rev;
 192                 if( rev2 != GIT_REV_ZERO )
 193                         rev = rev2;
 194                 if( rev1 != GIT_REV_ZERO )
 195                         rev = rev1;
 196
 197                 isWorkingCopy = true;
 198
 199                 cmd.Format(_T("git.exe diff %s -- \"%s\""),
 200                 rev,pPath->GetGitPathString());
 201
 202                 CString output, err;
 203                 if (g_Git.Run(cmd, &output, &err, CP_UTF8))
 204                 {
 205                         CMessageBox::Show(NULL, output + L"\n" + err, _T("TortoiseGit"), MB_OK|MB_ICONERROR);
 206                         return -1;
 207                 }
 208
 209                 if (output.IsEmpty())
 210                 {
 211                         output.Empty();
 212                         err.Empty();
 213                         // also compare against index
 214                         cmd.Format(_T("git.exe diff -- \"%s\""), pPath->GetGitPathString());
 215                         if (g_Git.Run(cmd, &output, &err, CP_UTF8))
 216                         {
 217                                 CMessageBox::Show(NULL, output + _T("\n") + err, _T("TortoiseGit"), MB_OK | MB_ICONERROR);
 218                                 return -1;
 219                         }
 220
 221                         if (output.IsEmpty())
 222                         {
 223                                 CMessageBox::Show(NULL, CString(MAKEINTRESOURCE(IDS_ERR_EMPTYDIFF)), _T("TortoiseGit"), MB_OK | MB_ICONERROR);
 224                                 return -1;
 225                         }
 226                         else if (CMessageBox::Show(NULL, CString(MAKEINTRESOURCE(IDS_SUBMODULE_EMPTYDIFF)), _T("TortoiseGit"), 1, IDI_QUESTION, CString(MAKEINTRESOURCE(IDS_MSGBOX_YES)), CString(MAKEINTRESOURCE(IDS_MSGBOX_NO))) == 1)
 227                         {
 228                                 CString sCmd;
 229                                 sCmd.Format(_T("/command:subupdate /bkpath:\"%s\""), g_Git.m_CurrentDir);
 230                                 CAppUtils::RunTortoiseGitProc(sCmd);
 231                         }
 232                         return -1;
 233                 }
 234
 235                 int start =0;
 236                 int oldstart = output.Find(_T("-Subproject commit"),start);
 237                 if(oldstart<0)
 238                 {
 239                         CMessageBox::Show(NULL,_T("Subproject Diff Format error") ,_T("TortoiseGit"),MB_OK|MB_ICONERROR);
 240                         return -1;
 241                 }
 242                 oldhash = output.Mid(oldstart+ CString(_T("-Subproject commit")).GetLength()+1,40);
 243                 start = 0;
 244                 int newstart = output.Find(_T("+Subproject commit"),start);
 245                 if (newstart < 0)
 246                 {
 247                         CMessageBox::Show(NULL,_T("Subproject Diff Format error") ,_T("TortoiseGit"),MB_OK|MB_ICONERROR);
 248                         return -1;
 249                 }
 250                 newhash = output.Mid(newstart+ CString(_T("+Subproject commit")).GetLength()+1,40);
 251                 dirty = output.Mid(newstart + CString(_T("+Subproject commit")).GetLength() + 41) == _T("-dirty\n");
 252         }
 253         else
 254         {
 255                 cmd.Format(_T("git.exe diff-tree -r -z %s %s -- \"%s\""),
 256                 rev2,rev1,pPath->GetGitPathString());
 257
 258                 BYTE_VECTOR bytes, errBytes;
 259                 if(g_Git.Run(cmd, &bytes, &errBytes))
 260                 {
 261                         CString err;
 262                         g_Git.StringAppend(&err, &errBytes[0], CP_UTF8);
 263                         CMessageBox::Show(NULL,err,_T("TortoiseGit"),MB_OK|MB_ICONERROR);
 264                         return -1;
 265                 }
 266
 267                 if (bytes.size() < 15 + 41 + 40)
 268                 {
 269                         CMessageBox::Show(NULL, _T("git diff-tree gives invalid output"), _T("TortoiseGit"), MB_OK | MB_ICONERROR);
 270                         return -1;
 271                 }
 272                 g_Git.StringAppend(&oldhash, &bytes[15], CP_UTF8, 40);
 273                 g_Git.StringAppend(&newhash, &bytes[15+41], CP_UTF8, 40);
 274
 275         }
 276
 277         CString oldsub;
 278         CString newsub;
 279         bool oldOK = false, newOK = false;
 280
 281         CGit subgit;
 282         subgit.m_CurrentDir = g_Git.CombinePath(pPath);
 283         ChangeType changeType = Unknown;
 284
 285         if (pPath->HasAdminDir())
 286                 GetSubmoduleChangeType(subgit, oldhash, newhash, oldOK, newOK, changeType, oldsub, newsub);
 287
 288         CSubmoduleDiffDlg submoduleDiffDlg;
 289         submoduleDiffDlg.SetDiff(pPath->GetWinPath(), isWorkingCopy, oldhash, oldsub, oldOK, newhash, newsub, newOK, dirty, changeType);
 290         submoduleDiffDlg.DoModal();
 291         if (submoduleDiffDlg.IsRefresh())
 292                 return 1;
 293
 294         return 0;
 295 }
 296
 297 void CGitDiff::GetSubmoduleChangeType(CGit& subgit, const CString& oldhash, const CString& newhash, bool& oldOK, bool& newOK, ChangeType& changeType, CString& oldsub, CString& newsub)
 298 {
 299         CString cmd;
 300         int encode = CAppUtils::GetLogOutputEncode(&subgit);
 301         int oldTime = 0, newTime = 0;
 302
 303         if (oldhash != GIT_REV_ZERO)
 304         {
 305                 CString cmdout, cmderr;
 306                 cmd.Format(_T("git.exe log -n1 --pretty=format:\"%%ct %%s\" %s --"), oldhash);
 307                 oldOK = !subgit.Run(cmd, &cmdout, &cmderr, encode);
 308                 if (oldOK)
 309                 {
 310                         int pos = cmdout.Find(_T(" "));
 311                         oldTime = _ttoi(cmdout.Left(pos));
 312                         oldsub = cmdout.Mid(pos + 1);
 313                 }
 314                 else
 315                         oldsub = cmderr;
 316         }
 317         if (newhash != GIT_REV_ZERO)
 318         {
 319                 CString cmdout, cmderr;
 320                 cmd.Format(_T("git.exe log -n1 --pretty=format:\"%%ct %%s\" %s --"), newhash);
 321                 newOK = !subgit.Run(cmd, &cmdout, &cmderr, encode);
 322                 if (newOK)
 323                 {
 324                         int pos = cmdout.Find(_T(" "));
 325                         newTime = _ttoi(cmdout.Left(pos));
 326                         newsub = cmdout.Mid(pos + 1);
 327                 }
 328                 else
 329                         newsub = cmderr;
 330         }
 331
 332         if (oldhash == GIT_REV_ZERO)
 333         {
 334                 oldOK = true;
 335                 changeType = NewSubmodule;
 336         }
 337         else if (newhash == GIT_REV_ZERO)
 338         {
 339                 newOK = true;
 340                 changeType = DeleteSubmodule;
 341         }
 342         else if (oldhash != newhash)
 343         {
 344                 bool ffNewer = false, ffOlder = false;
 345                 ffNewer = subgit.IsFastForward(oldhash, newhash);
 346                 if (!ffNewer)
 347                 {
 348                         ffOlder = subgit.IsFastForward(newhash, oldhash);
 349                         if (!ffOlder)
 350                         {
 351                                 if (newTime > oldTime)
 352                                         changeType = NewerTime;
 353                                 else if (newTime < oldTime)
 354                                         changeType = OlderTime;
 355                                 else
 356                                         changeType = SameTime;
 357                         }
 358                         else
 359                                 changeType = Rewind;
 360                 }
 361                 else
 362                         changeType = FastForward;
 363         }
 364
 365         if (!oldOK || !newOK)
 366                 changeType = Unknown;
 367 }
 368
 369 int CGitDiff::Diff(const CTGitPath * pPath, const CTGitPath * pPath2, git_revnum_t rev1, git_revnum_t rev2, bool /*blame*/, bool /*unified*/, int jumpToLine)
 370 {
 371         CString temppath;
 372         GetTempPath(temppath);
 373
 374         // make sure we have HASHes here, otherwise filenames might be invalid
 375         if (rev1 != GIT_REV_ZERO)
 376         {
 377                 CGitHash rev1Hash;
 378                 if (g_Git.GetHash(rev1Hash, rev1))
 379                 {
 380                         MessageBox(NULL, g_Git.GetGitLastErr(_T("Could not get hash of \"") + rev1 + _T("\".")), _T("TortoiseGit"), MB_ICONERROR);
 381                         return -1;
 382                 }
 383                 rev1 = rev1Hash.ToString();
 384         }
 385         if (rev2 != GIT_REV_ZERO)
 386         {
 387                 CGitHash rev2Hash;
 388                 if (g_Git.GetHash(rev2Hash, rev2))
 389                 {
 390                         MessageBox(NULL, g_Git.GetGitLastErr(_T("Could not get hash of \"") + rev2 + _T("\".")), _T("TortoiseGit"), MB_ICONERROR);
 391                         return -1;
 392                 }
 393                 rev2 = rev2Hash.ToString();
 394         }
 395
 396         CString file1;
 397         CString title1;
 398         CString cmd;
 399
 400         if(pPath->IsDirectory() || pPath2->IsDirectory())
 401         {
 402                 int result;
 403                 // refresh if result = 1
 404                 CTGitPath path = *pPath;
 405                 CTGitPath path2 = *pPath2;
 406                 while ((result = SubmoduleDiff(&path, &path2, rev1, rev2)) == 1)
 407                 {
 408                         path.SetFromGit(pPath->GetGitPathString());
 409                         path2.SetFromGit(pPath2->GetGitPathString());
 410                 }
 411                 return result;
 412         }
 413
 414         if(rev1 != GIT_REV_ZERO )
 415         {
 416                 TCHAR szTempName[MAX_PATH] = {0};
 417                 GetTempFileName(temppath, pPath->GetBaseFilename(), 0, szTempName);
 418                 CString temp(szTempName);
 419                 DeleteFile(szTempName);
 420                 CreateDirectory(szTempName, NULL);
 421                 // use original file extension, an external diff tool might need it
 422                 file1.Format(_T("%s\\%s-%s-right%s"),
 423                                 temp,
 424                                 pPath->GetBaseFilename(),
 425                                 rev1.Left(g_Git.GetShortHASHLength()),
 426                                 pPath->GetFileExtension());
 427                 title1 = pPath->GetFileOrDirectoryName() + _T(":") + rev1.Left(g_Git.GetShortHASHLength());
 428                 if (g_Git.GetOneFile(rev1, *pPath, file1))
 429                 {
 430                         CString out;
 431                         out.Format(IDS_STATUSLIST_CHECKOUTFILEFAILED, pPath->GetGitPathString(), rev1, file1);
 432                         CMessageBox::Show(nullptr, g_Git.GetGitLastErr(out, CGit::GIT_CMD_GETONEFILE), _T("TortoiseGit"), MB_OK);
 433                         return -1;
 434                 }
 435                 ::SetFileAttributes(file1, FILE_ATTRIBUTE_READONLY);
 436         }
 437         else
 438         {
 439                 file1 = g_Git.CombinePath(pPath);
 440                 title1.Format( IDS_DIFF_WCNAME, pPath->GetFileOrDirectoryName() );
 441                 if (!PathFileExists(file1))
 442                 {
 443                         CString sMsg;
 444                         sMsg.Format(IDS_PROC_DIFFERROR_FILENOTINWORKINGTREE, file1);
 445                         if (MessageBox(NULL, sMsg, _T("TortoiseGit"), MB_ICONEXCLAMATION | MB_YESNO) != IDYES)
 446                                 return 1;
 447                         if (!CCommonAppUtils::FileOpenSave(file1, NULL, IDS_SELECTFILE, IDS_COMMONFILEFILTER, true))
 448                                 return 1;
 449                         title1.Format(IDS_DIFF_WCNAME, CTGitPath(file1).GetUIFileOrDirectoryName());
 450                 }
 451         }
 452
 453         CString file2;
 454         CString title2;
 455         if(rev2 != GIT_REV_ZERO)
 456         {
 457                 TCHAR szTempName[MAX_PATH] = {0};
 458                 GetTempFileName(temppath, pPath2->GetBaseFilename(), 0, szTempName);
 459                 CString temp(szTempName);
 460                 DeleteFile(szTempName);
 461                 CreateDirectory(szTempName, NULL);
 462                 CTGitPath fileName = *pPath2;
 463                 if (pPath2->m_Action & CTGitPath::LOGACTIONS_REPLACED)
 464                         fileName = CTGitPath(pPath2->GetGitOldPathString());
 465
 466                 // use original file extension, an external diff tool might need it
 467                 file2.Format(_T("%s\\%s-%s-left%s"),
 468                                 temp,
 469                                 fileName.GetBaseFilename(),
 470                                 rev2.Left(g_Git.GetShortHASHLength()),
 471                                 fileName.GetFileExtension());
 472                 title2 = fileName.GetFileOrDirectoryName() + _T(":") + rev2.Left(g_Git.GetShortHASHLength());
 473                 if (g_Git.GetOneFile(rev2, fileName, file2))
 474                 {
 475                         CString out;
 476                         out.Format(IDS_STATUSLIST_CHECKOUTFILEFAILED, pPath->GetGitPathString(), rev2, file2);
 477                         CMessageBox::Show(nullptr, g_Git.GetGitLastErr(out, CGit::GIT_CMD_GETONEFILE), _T("TortoiseGit"), MB_OK);
 478                         return -1;
 479                 }
 480                 ::SetFileAttributes(file2, FILE_ATTRIBUTE_READONLY);
 481         }
 482         else
 483         {
 484                 file2 = g_Git.CombinePath(pPath2);
 485                 title2.Format( IDS_DIFF_WCNAME, pPath2->GetFileOrDirectoryName() );
 486         }
 487
 488         if (pPath->m_Action == pPath->LOGACTIONS_ADDED)
 489         {
 490                 CGitDiff::DiffNull(pPath, rev1, true, jumpToLine);
 491         }
 492         else if (pPath->m_Action == pPath->LOGACTIONS_DELETED)
 493         {
 494                 CGitDiff::DiffNull(pPath, rev2, false, jumpToLine);
 495         }
 496         else
 497         {
 498                 CAppUtils::DiffFlags flags;
 499                 CAppUtils::StartExtDiff(file2,file1,
 500                                                                 title2,
 501                                                                 title1,
 502                                                                 g_Git.CombinePath(pPath2),
 503                                                                 g_Git.CombinePath(pPath),
 504                                                                 rev2,
 505                                                                 rev1,
 506                                                                 flags, jumpToLine);
 507         }
 508         return 0;
 509 }
 510
 511 int CGitDiff::DiffCommit(const CTGitPath &path, const GitRev *r1, const GitRev *r2)
 512 {
 513         return DiffCommit(path, path, r1, r2);
 514 }
 515
 516 int CGitDiff::DiffCommit(const CTGitPath &path1, const CTGitPath &path2, const GitRev *r1, const GitRev *r2)
 517 {
 518         if (path1.GetWinPathString().IsEmpty())
 519         {
 520                 CFileDiffDlg dlg;
 521                 dlg.SetDiff(NULL, *r1, *r2);
 522                 dlg.DoModal();
 523         }
 524         else if (path1.IsDirectory())
 525         {
 526                 CFileDiffDlg dlg;
 527                 dlg.SetDiff(&path1, *r1, *r2);
 528                 dlg.DoModal();
 529         }
 530         else
 531         {
 532                 Diff(&path1, &path2, r1->m_CommitHash.ToString(), r2->m_CommitHash.ToString());
 533         }
 534         return 0;
 535 }
 536
 537 int CGitDiff::DiffCommit(const CTGitPath &path, const CString &r1, const CString &r2)
 538 {
 539         return DiffCommit(path, path, r1, r2);
 540 }
 541
 542
 543 int CGitDiff::DiffCommit(const CTGitPath &path1, const CTGitPath &path2, const CString &r1, const CString &r2)
 544 {
 545         if (path1.GetWinPathString().IsEmpty())
 546         {
 547                 CFileDiffDlg dlg;
 548                 dlg.SetDiff(NULL, r1, r2);
 549                 dlg.DoModal();
 550         }
 551         else if (path1.IsDirectory())
 552         {
 553                 CFileDiffDlg dlg;
 554                 dlg.SetDiff(&path1, r1, r2);
 555                 dlg.DoModal();
 556         }
 557         else
 558         {
 559                 Diff(&path1, &path2, r1, r2);
 560         }
 561         return 0;
 562 }