src/GvimExt/gvimext.cpp

   1 /* vi:set ts=8 sts=4 sw=4:
   2  *
   3  * VIM - Vi IMproved    gvimext by Tianmiao Hu
   4  *
   5  * Do ":help uganda"  in Vim to read copying and usage conditions.
   6  * Do ":help credits" in Vim to see a list of people who contributed.
   7  */
   8
   9 /*
  10  * gvimext is a DLL which is used for the "Edit with Vim" context menu
  11  * extension.  It implements a MS defined interface with the Shell.
  12  *
  13  * If you have any questions or any suggestions concerning gvimext, please
  14  * contact Tianmiao Hu: tianmiao@acm.org.
  15  */
  16
  17 #include "gvimext.h"
  18
  19 #ifdef __BORLANDC__
  20 # include <dir.h>
  21 # ifndef _strnicmp
  22 #  define _strnicmp(a, b, c) strnicmp((a), (b), (c))
  23 # endif
  24 #else
  25 static char *searchpath(char *name);
  26 #endif
  27
  28 // Always get an error while putting the following stuff to the
  29 // gvimext.h file as class protected variables, give up and
  30 // declare them as global stuff
  31 FORMATETC fmte = {CF_HDROP,
  32                   (DVTARGETDEVICE FAR *)NULL,
  33                   DVASPECT_CONTENT,
  34                   -1,
  35                   TYMED_HGLOBAL
  36                  };
  37 STGMEDIUM medium;
  38 HRESULT hres = 0;
  39 UINT cbFiles = 0;
  40
  41 /* The buffers size used to be MAX_PATH (256 bytes), but that's not always
  42  * enough */
  43 #define BUFSIZE 1100
  44
  45 //
  46 // Get the name of the Gvim executable to use, with the path.
  47 // When "runtime" is non-zero, we were called to find the runtime directory.
  48 // Returns the path in name[BUFSIZE].  It's empty when it fails.
  49 //
  50     static void
  51 getGvimName(char *name, int runtime)
  52 {
  53     HKEY        keyhandle;
  54     DWORD       hlen;
  55
  56     // Get the location of gvim from the registry.
  57     name[0] = 0;
  58     if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, "Software\\Vim\\Gvim", 0,
  59                                        KEY_READ, &keyhandle) == ERROR_SUCCESS)
  60     {
  61         hlen = BUFSIZE;
  62         if (RegQueryValueEx(keyhandle, "path", 0, NULL, (BYTE *)name, &hlen)
  63                                                              != ERROR_SUCCESS)
  64             name[0] = 0;
  65         else
  66             name[hlen] = 0;
  67         RegCloseKey(keyhandle);
  68     }
  69
  70     // Registry didn't work, use the search path.
  71     if (name[0] == 0)
  72         strcpy(name, searchpath((char *)"gvim.exe"));
  73
  74     if (!runtime)
  75     {
  76         // Only when looking for the executable, not the runtime dir, we can
  77         // search for the batch file or a name without a path.
  78         if (name[0] == 0)
  79             strcpy(name, searchpath((char *)"gvim.bat"));
  80         if (name[0] == 0)
  81             strcpy(name, "gvim");       // finds gvim.bat or gvim.exe
  82
  83         // avoid that Vim tries to expand wildcards in the file names
  84         strcat(name, " --literal");
  85     }
  86 }
  87
  88 //
  89 // Get the Vim runtime directory into buf[BUFSIZE].
  90 // The result is empty when it failed.
  91 // When it works, the path ends in a slash or backslash.
  92 //
  93     static void
  94 getRuntimeDir(char *buf)
  95 {
  96     int         idx;
  97
  98     getGvimName(buf, 1);
  99     if (buf[0] != 0)
 100     {
 101         // When no path found, use the search path to expand it.
 102         if (strchr(buf, '/') == NULL && strchr(buf, '\\') == NULL)
 103             strcpy(buf, searchpath(buf));
 104
 105         // remove "gvim.exe" from the end
 106         for (idx = (int)strlen(buf) - 1; idx >= 0; idx--)
 107             if (buf[idx] == '\\' || buf[idx] == '/')
 108             {
 109                 buf[idx + 1] = 0;
 110                 break;
 111             }
 112     }
 113 }
 114
 115 //
 116 // GETTEXT: translated messages and menu entries
 117 //
 118 #ifndef FEAT_GETTEXT
 119 # define _(x)  x
 120 #else
 121 # define _(x)  (*dyn_libintl_gettext)(x)
 122 # define VIMPACKAGE "vim"
 123 # ifndef GETTEXT_DLL
 124 #  define GETTEXT_DLL "libintl.dll"
 125 # endif
 126
 127 // Dummy functions
 128 static char *null_libintl_gettext(const char *);
 129 static char *null_libintl_textdomain(const char *);
 130 static char *null_libintl_bindtextdomain(const char *, const char *);
 131 static int dyn_libintl_init(char *dir);
 132 static void dyn_libintl_end(void);
 133
 134 static HINSTANCE hLibintlDLL = 0;
 135 static char *(*dyn_libintl_gettext)(const char *) = null_libintl_gettext;
 136 static char *(*dyn_libintl_textdomain)(const char *) = null_libintl_textdomain;
 137 static char *(*dyn_libintl_bindtextdomain)(const char *, const char *)
 138                                                 = null_libintl_bindtextdomain;
 139
 140 //
 141 // Attempt to load libintl.dll.  If it doesn't work, use dummy functions.
 142 // "dir" is the directory where the libintl.dll might be.
 143 // Return 1 for success, 0 for failure.
 144 //
 145     static int
 146 dyn_libintl_init(char *dir)
 147 {
 148     int         i;
 149     static struct
 150     {
 151         char        *name;
 152         FARPROC     *ptr;
 153     } libintl_entry[] =
 154     {
 155         {(char *)"gettext",             (FARPROC*)&dyn_libintl_gettext},
 156         {(char *)"textdomain",          (FARPROC*)&dyn_libintl_textdomain},
 157         {(char *)"bindtextdomain",      (FARPROC*)&dyn_libintl_bindtextdomain},
 158         {NULL, NULL}
 159     };
 160
 161     // No need to initialize twice.
 162     if (hLibintlDLL)
 163         return 1;
 164
 165     // Load gettext library, first try the Vim runtime directory, then search
 166     // the path.
 167     strcat(dir, GETTEXT_DLL);
 168     hLibintlDLL = LoadLibrary(dir);
 169     if (!hLibintlDLL)
 170     {
 171         hLibintlDLL = LoadLibrary(GETTEXT_DLL);
 172         if (!hLibintlDLL)
 173             return 0;
 174     }
 175
 176     // Get the addresses of the functions we need.
 177     for (i = 0; libintl_entry[i].name != NULL
 178                                          && libintl_entry[i].ptr != NULL; ++i)
 179     {
 180         if ((*libintl_entry[i].ptr = GetProcAddress(hLibintlDLL,
 181                                               libintl_entry[i].name)) == NULL)
 182         {
 183             dyn_libintl_end();
 184             return 0;
 185         }
 186     }
 187     return 1;
 188 }
 189
 190     static void
 191 dyn_libintl_end(void)
 192 {
 193     if (hLibintlDLL)
 194         FreeLibrary(hLibintlDLL);
 195     hLibintlDLL                 = NULL;
 196     dyn_libintl_gettext         = null_libintl_gettext;
 197     dyn_libintl_textdomain      = null_libintl_textdomain;
 198     dyn_libintl_bindtextdomain  = null_libintl_bindtextdomain;
 199 }
 200
 201     static char *
 202 null_libintl_gettext(const char *msgid)
 203 {
 204     return (char *)msgid;
 205 }
 206
 207     static char *
 208 null_libintl_bindtextdomain(const char *domainname, const char *dirname)
 209 {
 210     return NULL;
 211 }
 212
 213     static char *
 214 null_libintl_textdomain(const char* domainname)
 215 {
 216     return NULL;
 217 }
 218
 219 //
 220 // Setup for translating strings.
 221 //
 222     static void
 223 dyn_gettext_load(void)
 224 {
 225     char    szBuff[BUFSIZE];
 226     char    szLang[BUFSIZE];
 227     DWORD   len;
 228     HKEY    keyhandle;
 229     int     gotlang = 0;
 230
 231     strcpy(szLang, "LANG=");
 232
 233     // First try getting the language from the registry, this can be
 234     // used to overrule the system language.
 235     if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, "Software\\Vim\\Gvim", 0,
 236                                        KEY_READ, &keyhandle) == ERROR_SUCCESS)
 237     {
 238         len = BUFSIZE;
 239         if (RegQueryValueEx(keyhandle, "lang", 0, NULL, (BYTE*)szBuff, &len)
 240                                                              == ERROR_SUCCESS)
 241         {
 242             szBuff[len] = 0;
 243             strcat(szLang, szBuff);
 244             gotlang = 1;
 245         }
 246         RegCloseKey(keyhandle);
 247     }
 248
 249     if (!gotlang && getenv("LANG") == NULL)
 250     {
 251         // Get the language from the system.
 252         // Could use LOCALE_SISO639LANGNAME, but it's not in Win95.
 253         // LOCALE_SABBREVLANGNAME gives us three letters, like "enu", we use
 254         // only the first two.
 255         len = GetLocaleInfo(LOCALE_USER_DEFAULT, LOCALE_SABBREVLANGNAME,
 256                                                     (LPTSTR)szBuff, BUFSIZE);
 257         if (len >= 2 && _strnicmp(szBuff, "en", 2) != 0)
 258         {
 259             // There are a few exceptions (probably more)
 260             if (_strnicmp(szBuff, "cht", 3) == 0
 261                                           || _strnicmp(szBuff, "zht", 3) == 0)
 262                 strcpy(szBuff, "zh_TW");
 263             else if (_strnicmp(szBuff, "chs", 3) == 0
 264                                           || _strnicmp(szBuff, "zhc", 3) == 0)
 265                 strcpy(szBuff, "zh_CN");
 266             else if (_strnicmp(szBuff, "jp", 2) == 0)
 267                 strcpy(szBuff, "ja");
 268             else
 269                 szBuff[2] = 0;  // truncate to two-letter code
 270             strcat(szLang, szBuff);
 271             gotlang = 1;
 272         }
 273     }
 274     if (gotlang)
 275         putenv(szLang);
 276
 277     // Try to locate the runtime files.  The path is used to find libintl.dll
 278     // and the vim.mo files.
 279     getRuntimeDir(szBuff);
 280     if (szBuff[0] != 0)
 281     {
 282         len = (DWORD)strlen(szBuff);
 283         if (dyn_libintl_init(szBuff))
 284         {
 285             strcpy(szBuff + len, "lang");
 286
 287             (*dyn_libintl_bindtextdomain)(VIMPACKAGE, szBuff);
 288             (*dyn_libintl_textdomain)(VIMPACKAGE);
 289         }
 290     }
 291 }
 292
 293     static void
 294 dyn_gettext_free(void)
 295 {
 296     dyn_libintl_end();
 297 }
 298 #endif // FEAT_GETTEXT
 299
 300 //
 301 // Global variables
 302 //
 303 UINT      g_cRefThisDll = 0;    // Reference count of this DLL.
 304 HINSTANCE g_hmodThisDll = NULL; // Handle to this DLL itself.
 305
 306
 307 //---------------------------------------------------------------------------
 308 // DllMain
 309 //---------------------------------------------------------------------------
 310 extern "C" int APIENTRY
 311 DllMain(HINSTANCE hInstance, DWORD dwReason, LPVOID lpReserved)
 312 {
 313     switch (dwReason)
 314     {
 315     case DLL_PROCESS_ATTACH:
 316         // Extension DLL one-time initialization
 317         g_hmodThisDll = hInstance;
 318         break;
 319
 320     case DLL_PROCESS_DETACH:
 321         break;
 322     }
 323
 324     return 1;   // ok
 325 }
 326
 327     static void
 328 inc_cRefThisDLL()
 329 {
 330 #ifdef FEAT_GETTEXT
 331     if (g_cRefThisDll == 0)
 332         dyn_gettext_load();
 333 #endif
 334     InterlockedIncrement((LPLONG)&g_cRefThisDll);
 335 }
 336
 337     static void
 338 dec_cRefThisDLL()
 339 {
 340 #ifdef FEAT_GETTEXT
 341     if (InterlockedDecrement((LPLONG)&g_cRefThisDll) == 0)
 342         dyn_gettext_free();
 343 #else
 344     InterlockedDecrement((LPLONG)&g_cRefThisDll);
 345 #endif
 346 }
 347
 348 //---------------------------------------------------------------------------
 349 // DllCanUnloadNow
 350 //---------------------------------------------------------------------------
 351
 352 STDAPI DllCanUnloadNow(void)
 353 {
 354     return (g_cRefThisDll == 0 ? S_OK : S_FALSE);
 355 }
 356
 357 STDAPI DllGetClassObject(REFCLSID rclsid, REFIID riid, LPVOID *ppvOut)
 358 {
 359     *ppvOut = NULL;
 360
 361     if (IsEqualIID(rclsid, CLSID_ShellExtension))
 362     {
 363         CShellExtClassFactory *pcf = new CShellExtClassFactory;
 364
 365         return pcf->QueryInterface(riid, ppvOut);
 366     }
 367
 368     return CLASS_E_CLASSNOTAVAILABLE;
 369 }
 370
 371 CShellExtClassFactory::CShellExtClassFactory()
 372 {
 373     m_cRef = 0L;
 374
 375     inc_cRefThisDLL();
 376 }
 377
 378 CShellExtClassFactory::~CShellExtClassFactory()
 379 {
 380     dec_cRefThisDLL();
 381 }
 382
 383 STDMETHODIMP CShellExtClassFactory::QueryInterface(REFIID riid,
 384                                                    LPVOID FAR *ppv)
 385 {
 386     *ppv = NULL;
 387
 388     // Any interface on this object is the object pointer
 389
 390     if (IsEqualIID(riid, IID_IUnknown) || IsEqualIID(riid, IID_IClassFactory))
 391     {
 392         *ppv = (LPCLASSFACTORY)this;
 393
 394         AddRef();
 395
 396         return NOERROR;
 397     }
 398
 399     return E_NOINTERFACE;
 400 }
 401
 402 STDMETHODIMP_(ULONG) CShellExtClassFactory::AddRef()
 403 {
 404     return InterlockedIncrement((LPLONG)&m_cRef);
 405 }
 406
 407 STDMETHODIMP_(ULONG) CShellExtClassFactory::Release()
 408 {
 409     if (InterlockedDecrement((LPLONG)&m_cRef))
 410         return m_cRef;
 411
 412     delete this;
 413
 414     return 0L;
 415 }
 416
 417 STDMETHODIMP CShellExtClassFactory::CreateInstance(LPUNKNOWN pUnkOuter,
 418                                                       REFIID riid,
 419                                                       LPVOID *ppvObj)
 420 {
 421     *ppvObj = NULL;
 422
 423     // Shell extensions typically don't support aggregation (inheritance)
 424
 425     if (pUnkOuter)
 426         return CLASS_E_NOAGGREGATION;
 427
 428     // Create the main shell extension object.  The shell will then call
 429     // QueryInterface with IID_IShellExtInit--this is how shell extensions are
 430     // initialized.
 431
 432     LPCSHELLEXT pShellExt = new CShellExt();  //Create the CShellExt object
 433
 434     if (NULL == pShellExt)
 435         return E_OUTOFMEMORY;
 436
 437     return pShellExt->QueryInterface(riid, ppvObj);
 438 }
 439
 440
 441 STDMETHODIMP CShellExtClassFactory::LockServer(BOOL fLock)
 442 {
 443     return NOERROR;
 444 }
 445
 446 // *********************** CShellExt *************************
 447 CShellExt::CShellExt()
 448 {
 449     m_cRef = 0L;
 450     m_pDataObj = NULL;
 451
 452     inc_cRefThisDLL();
 453 }
 454
 455 CShellExt::~CShellExt()
 456 {
 457     if (m_pDataObj)
 458         m_pDataObj->Release();
 459
 460     dec_cRefThisDLL();
 461 }
 462
 463 STDMETHODIMP CShellExt::QueryInterface(REFIID riid, LPVOID FAR *ppv)
 464 {
 465     *ppv = NULL;
 466
 467     if (IsEqualIID(riid, IID_IShellExtInit) || IsEqualIID(riid, IID_IUnknown))
 468     {
 469         *ppv = (LPSHELLEXTINIT)this;
 470     }
 471     else if (IsEqualIID(riid, IID_IContextMenu))
 472     {
 473         *ppv = (LPCONTEXTMENU)this;
 474     }
 475
 476     if (*ppv)
 477     {
 478         AddRef();
 479
 480         return NOERROR;
 481     }
 482
 483     return E_NOINTERFACE;
 484 }
 485
 486 STDMETHODIMP_(ULONG) CShellExt::AddRef()
 487 {
 488     return InterlockedIncrement((LPLONG)&m_cRef);
 489 }
 490
 491 STDMETHODIMP_(ULONG) CShellExt::Release()
 492 {
 493
 494     if (InterlockedDecrement((LPLONG)&m_cRef))
 495         return m_cRef;
 496
 497     delete this;
 498
 499     return 0L;
 500 }
 501
 502
 503 //
 504 //  FUNCTION: CShellExt::Initialize(LPCITEMIDLIST, LPDATAOBJECT, HKEY)
 505 //
 506 //  PURPOSE: Called by the shell when initializing a context menu or property
 507 //           sheet extension.
 508 //
 509 //  PARAMETERS:
 510 //    pIDFolder - Specifies the parent folder
 511 //    pDataObj  - Spefifies the set of items selected in that folder.
 512 //    hRegKey   - Specifies the type of the focused item in the selection.
 513 //
 514 //  RETURN VALUE:
 515 //
 516 //    NOERROR in all cases.
 517 //
 518 //  COMMENTS:   Note that at the time this function is called, we don't know
 519 //              (or care) what type of shell extension is being initialized.
 520 //              It could be a context menu or a property sheet.
 521 //
 522
 523 STDMETHODIMP CShellExt::Initialize(LPCITEMIDLIST pIDFolder,
 524                                    LPDATAOBJECT pDataObj,
 525                                    HKEY hRegKey)
 526 {
 527     // Initialize can be called more than once
 528     if (m_pDataObj)
 529         m_pDataObj->Release();
 530
 531     // duplicate the object pointer and registry handle
 532
 533     if (pDataObj)
 534     {
 535         m_pDataObj = pDataObj;
 536         pDataObj->AddRef();
 537     }
 538
 539     return NOERROR;
 540 }
 541
 542
 543 //
 544 //  FUNCTION: CShellExt::QueryContextMenu(HMENU, UINT, UINT, UINT, UINT)
 545 //
 546 //  PURPOSE: Called by the shell just before the context menu is displayed.
 547 //           This is where you add your specific menu items.
 548 //
 549 //  PARAMETERS:
 550 //    hMenu      - Handle to the context menu
 551 //    indexMenu  - Index of where to begin inserting menu items
 552 //    idCmdFirst - Lowest value for new menu ID's
 553 //    idCmtLast  - Highest value for new menu ID's
 554 //    uFlags     - Specifies the context of the menu event
 555 //
 556 //  RETURN VALUE:
 557 //
 558 //
 559 //  COMMENTS:
 560 //
 561
 562 STDMETHODIMP CShellExt::QueryContextMenu(HMENU hMenu,
 563                                          UINT indexMenu,
 564                                          UINT idCmdFirst,
 565                                          UINT idCmdLast,
 566                                          UINT uFlags)
 567 {
 568     UINT idCmd = idCmdFirst;
 569
 570     hres = m_pDataObj->GetData(&fmte, &medium);
 571     if (medium.hGlobal)
 572         cbFiles = DragQueryFile((HDROP)medium.hGlobal, (UINT)-1, 0, 0);
 573
 574     // InsertMenu(hMenu, indexMenu++, MF_SEPARATOR|MF_BYPOSITION, 0, NULL);
 575
 576     // Initialize m_cntOfHWnd to 0
 577     m_cntOfHWnd = 0;
 578     // Retrieve all the vim instances
 579     EnumWindows(EnumWindowsProc, (LPARAM)this);
 580
 581     if (cbFiles > 1)
 582     {
 583         InsertMenu(hMenu,
 584                 indexMenu++,
 585                 MF_STRING|MF_BYPOSITION,
 586                 idCmd++,
 587                 _("Edit with &multiple Vims"));
 588
 589         InsertMenu(hMenu,
 590                 indexMenu++,
 591                 MF_STRING|MF_BYPOSITION,
 592                 idCmd++,
 593                 _("Edit with single &Vim"));
 594
 595         if (cbFiles <= 4)
 596         {
 597             // Can edit up to 4 files in diff mode
 598             InsertMenu(hMenu,
 599                     indexMenu++,
 600                     MF_STRING|MF_BYPOSITION,
 601                     idCmd++,
 602                     _("Diff with Vim"));
 603             m_edit_existing_off = 3;
 604         }
 605         else
 606             m_edit_existing_off = 2;
 607
 608     }
 609     else
 610     {
 611         InsertMenu(hMenu,
 612                 indexMenu++,
 613                 MF_STRING|MF_BYPOSITION,
 614                 idCmd++,
 615                 _("Edit with &Vim"));
 616         m_edit_existing_off = 1;
 617     }
 618
 619     // Now display all the vim instances
 620     for (int i = 0; i < m_cntOfHWnd; i++)
 621     {
 622         char title[BUFSIZE];
 623         char temp[BUFSIZE];
 624
 625         // Obtain window title, continue if can not
 626         if (GetWindowText(m_hWnd[i], title, BUFSIZE - 1) == 0)
 627             continue;
 628         // Truncate the title before the path, keep the file name
 629         char *pos = strchr(title, '(');
 630         if (pos != NULL)
 631         {
 632             if (pos > title && pos[-1] == ' ')
 633                 --pos;
 634             *pos = 0;
 635         }
 636         // Now concatenate
 637         strncpy(temp, _("Edit with existing Vim - "), BUFSIZE - 1);
 638         strncat(temp, title, BUFSIZE - 1);
 639         InsertMenu(hMenu,
 640                 indexMenu++,
 641                 MF_STRING|MF_BYPOSITION,
 642                 idCmd++,
 643                 temp);
 644     }
 645     // InsertMenu(hMenu, indexMenu++, MF_SEPARATOR|MF_BYPOSITION, 0, NULL);
 646
 647     // Must return number of menu items we added.
 648     return ResultFromShort(idCmd-idCmdFirst);
 649 }
 650
 651 //
 652 //  FUNCTION: CShellExt::InvokeCommand(LPCMINVOKECOMMANDINFO)
 653 //
 654 //  PURPOSE: Called by the shell after the user has selected on of the
 655 //           menu items that was added in QueryContextMenu().
 656 //
 657 //  PARAMETERS:
 658 //    lpcmi - Pointer to an CMINVOKECOMMANDINFO structure
 659 //
 660 //  RETURN VALUE:
 661 //
 662 //
 663 //  COMMENTS:
 664 //
 665
 666 STDMETHODIMP CShellExt::InvokeCommand(LPCMINVOKECOMMANDINFO lpcmi)
 667 {
 668     HRESULT hr = E_INVALIDARG;
 669
 670     // If HIWORD(lpcmi->lpVerb) then we have been called programmatically
 671     // and lpVerb is a command that should be invoked.  Otherwise, the shell
 672     // has called us, and LOWORD(lpcmi->lpVerb) is the menu ID the user has
 673     // selected.  Actually, it's (menu ID - idCmdFirst) from QueryContextMenu().
 674     if (!HIWORD(lpcmi->lpVerb))
 675     {
 676         UINT idCmd = LOWORD(lpcmi->lpVerb);
 677
 678         if (idCmd >= m_edit_existing_off)
 679         {
 680             // Existing with vim instance
 681             hr = PushToWindow(lpcmi->hwnd,
 682                     lpcmi->lpDirectory,
 683                     lpcmi->lpVerb,
 684                     lpcmi->lpParameters,
 685                     lpcmi->nShow,
 686                     idCmd - m_edit_existing_off);
 687         }
 688         else
 689         {
 690             switch (idCmd)
 691             {
 692                 case 0:
 693                     hr = InvokeGvim(lpcmi->hwnd,
 694                             lpcmi->lpDirectory,
 695                             lpcmi->lpVerb,
 696                             lpcmi->lpParameters,
 697                             lpcmi->nShow);
 698                     break;
 699                 case 1:
 700                     hr = InvokeSingleGvim(lpcmi->hwnd,
 701                             lpcmi->lpDirectory,
 702                             lpcmi->lpVerb,
 703                             lpcmi->lpParameters,
 704                             lpcmi->nShow,
 705                             0);
 706                     break;
 707                 case 2:
 708                     hr = InvokeSingleGvim(lpcmi->hwnd,
 709                             lpcmi->lpDirectory,
 710                             lpcmi->lpVerb,
 711                             lpcmi->lpParameters,
 712                             lpcmi->nShow,
 713                             1);
 714                     break;
 715             }
 716         }
 717     }
 718     return hr;
 719 }
 720
 721 STDMETHODIMP CShellExt::PushToWindow(HWND hParent,
 722                                    LPCSTR pszWorkingDir,
 723                                    LPCSTR pszCmd,
 724                                    LPCSTR pszParam,
 725                                    int iShowCmd,
 726                                    int idHWnd)
 727 {
 728     HWND hWnd = m_hWnd[idHWnd];
 729
 730     // Show and bring vim instance to foreground
 731     if (IsIconic(hWnd) != 0)
 732         ShowWindow(hWnd, SW_RESTORE);
 733     else
 734         ShowWindow(hWnd, SW_SHOW);
 735     SetForegroundWindow(hWnd);
 736
 737     // Post the selected files to the vim instance
 738     PostMessage(hWnd, WM_DROPFILES, (WPARAM)medium.hGlobal, 0);
 739
 740     return NOERROR;
 741 }
 742
 743 STDMETHODIMP CShellExt::GetCommandString(UINT_PTR idCmd,
 744                                          UINT uFlags,
 745                                          UINT FAR *reserved,
 746                                          LPSTR pszName,
 747                                          UINT cchMax)
 748 {
 749     if (uFlags == GCS_HELPTEXT && cchMax > 35)
 750         lstrcpy(pszName, _("Edits the selected file(s) with Vim"));
 751
 752     return NOERROR;
 753 }
 754
 755 BOOL CALLBACK CShellExt::EnumWindowsProc(HWND hWnd, LPARAM lParam)
 756 {
 757     char temp[BUFSIZE];
 758
 759     // First do a bunch of check
 760     // No invisible window
 761     if (!IsWindowVisible(hWnd)) return TRUE;
 762     // No child window ???
 763     // if (GetParent(hWnd)) return TRUE;
 764     // Class name should be Vim, if failed to get class name, return
 765     if (GetClassName(hWnd, temp, sizeof(temp)) == 0)
 766         return TRUE;
 767     // Compare class name to that of vim, if not, return
 768     if (_strnicmp(temp, "vim", sizeof("vim")) != 0)
 769         return TRUE;
 770     // First check if the number of vim instance exceeds MAX_HWND
 771     CShellExt *cs = (CShellExt*) lParam;
 772     if (cs->m_cntOfHWnd >= MAX_HWND) return TRUE;
 773     // Now we get the vim window, put it into some kind of array
 774     cs->m_hWnd[cs->m_cntOfHWnd] = hWnd;
 775     cs->m_cntOfHWnd ++;
 776
 777     return TRUE; // continue enumeration (otherwise this would be false)
 778 }
 779
 780 #ifdef WIN32
 781 // This symbol is not defined in older versions of the SDK or Visual C++.
 782
 783 #ifndef VER_PLATFORM_WIN32_WINDOWS
 784 # define VER_PLATFORM_WIN32_WINDOWS 1
 785 #endif
 786
 787 static DWORD g_PlatformId;
 788
 789 //
 790 // Set g_PlatformId to VER_PLATFORM_WIN32_NT (NT) or
 791 // VER_PLATFORM_WIN32_WINDOWS (Win95).
 792 //
 793     static void
 794 PlatformId(void)
 795 {
 796     static int done = FALSE;
 797
 798     if (!done)
 799     {
 800         OSVERSIONINFO ovi;
 801
 802         ovi.dwOSVersionInfoSize = sizeof(ovi);
 803         GetVersionEx(&ovi);
 804
 805         g_PlatformId = ovi.dwPlatformId;
 806         done = TRUE;
 807     }
 808 }
 809
 810 # ifndef __BORLANDC__
 811     static char *
 812 searchpath(char *name)
 813 {
 814     static char widename[2 * BUFSIZE];
 815     static char location[2 * BUFSIZE + 2];
 816
 817     // There appears to be a bug in FindExecutableA() on Windows NT.
 818     // Use FindExecutableW() instead...
 819     PlatformId();
 820     if (g_PlatformId == VER_PLATFORM_WIN32_NT)
 821     {
 822         MultiByteToWideChar(CP_ACP, 0, (LPCTSTR)name, -1,
 823                 (LPWSTR)widename, BUFSIZE);
 824         if (FindExecutableW((LPCWSTR)widename, (LPCWSTR)"",
 825                     (LPWSTR)location) > (HINSTANCE)32)
 826         {
 827             WideCharToMultiByte(CP_ACP, 0, (LPWSTR)location, -1,
 828                     (LPSTR)widename, 2 * BUFSIZE, NULL, NULL);
 829             return widename;
 830         }
 831     }
 832     else
 833     {
 834         if (FindExecutableA((LPCTSTR)name, (LPCTSTR)"",
 835                     (LPTSTR)location) > (HINSTANCE)32)
 836             return location;
 837     }
 838     return (char *)"";
 839 }
 840 # endif
 841 #endif
 842
 843 STDMETHODIMP CShellExt::InvokeGvim(HWND hParent,
 844                                    LPCSTR pszWorkingDir,
 845                                    LPCSTR pszCmd,
 846                                    LPCSTR pszParam,
 847                                    int iShowCmd)
 848 {
 849     char m_szFileUserClickedOn[BUFSIZE];
 850     char cmdStr[BUFSIZE];
 851     UINT i;
 852
 853     for (i = 0; i < cbFiles; i++)
 854     {
 855         DragQueryFile((HDROP)medium.hGlobal,
 856                 i,
 857                 m_szFileUserClickedOn,
 858                 sizeof(m_szFileUserClickedOn));
 859
 860         getGvimName(cmdStr, 0);
 861         strcat(cmdStr, " \"");
 862
 863         if ((strlen(cmdStr) + strlen(m_szFileUserClickedOn) + 2) < BUFSIZE)
 864         {
 865             strcat(cmdStr, m_szFileUserClickedOn);
 866             strcat(cmdStr, "\"");
 867
 868             STARTUPINFO si;
 869             PROCESS_INFORMATION pi;
 870
 871             ZeroMemory(&si, sizeof(si));
 872             si.cb = sizeof(si);
 873
 874             // Start the child process.
 875             if (!CreateProcess(NULL,    // No module name (use command line).
 876                         cmdStr,         // Command line.
 877                         NULL,           // Process handle not inheritable.
 878                         NULL,           // Thread handle not inheritable.
 879                         FALSE,          // Set handle inheritance to FALSE.
 880                         0,              // No creation flags.
 881                         NULL,           // Use parent's environment block.
 882                         NULL,           // Use parent's starting directory.
 883                         &si,            // Pointer to STARTUPINFO structure.
 884                         &pi)            // Pointer to PROCESS_INFORMATION structure.
 885                )
 886             {
 887                 MessageBox(
 888                     hParent,
 889                     _("Error creating process: Check if gvim is in your path!"),
 890                     _("gvimext.dll error"),
 891                     MB_OK);
 892             }
 893             else
 894             {
 895                 CloseHandle( pi.hProcess );
 896                 CloseHandle( pi.hThread );
 897             }
 898         }
 899         else
 900         {
 901             MessageBox(
 902                 hParent,
 903                 _("Path length too long!"),
 904                 _("gvimext.dll error"),
 905                 MB_OK);
 906         }
 907     }
 908
 909     return NOERROR;
 910 }
 911
 912
 913 STDMETHODIMP CShellExt::InvokeSingleGvim(HWND hParent,
 914                                    LPCSTR pszWorkingDir,
 915                                    LPCSTR pszCmd,
 916                                    LPCSTR pszParam,
 917                                    int iShowCmd,
 918                                    int useDiff)
 919 {
 920     char        m_szFileUserClickedOn[BUFSIZE];
 921     char        *cmdStr;
 922     size_t      cmdlen;
 923     size_t      len;
 924     UINT i;
 925
 926     cmdlen = BUFSIZE;
 927     cmdStr = (char *)malloc(cmdlen);
 928     getGvimName(cmdStr, 0);
 929     if (useDiff)
 930         strcat(cmdStr, " -d");
 931     for (i = 0; i < cbFiles; i++)
 932     {
 933         DragQueryFile((HDROP)medium.hGlobal,
 934                 i,
 935                 m_szFileUserClickedOn,
 936                 sizeof(m_szFileUserClickedOn));
 937
 938         len = strlen(cmdStr) + strlen(m_szFileUserClickedOn) + 4;
 939         if (len > cmdlen)
 940         {
 941             cmdlen = len + BUFSIZE;
 942             cmdStr = (char *)realloc(cmdStr, cmdlen);
 943         }
 944         strcat(cmdStr, " \"");
 945         strcat(cmdStr, m_szFileUserClickedOn);
 946         strcat(cmdStr, "\"");
 947     }
 948
 949     STARTUPINFO si;
 950     PROCESS_INFORMATION pi;
 951
 952     ZeroMemory(&si, sizeof(si));
 953     si.cb = sizeof(si);
 954
 955     // Start the child process.
 956     if (!CreateProcess(NULL,    // No module name (use command line).
 957                 cmdStr,         // Command line.
 958                 NULL,           // Process handle not inheritable.
 959                 NULL,           // Thread handle not inheritable.
 960                 FALSE,          // Set handle inheritance to FALSE.
 961                 0,              // No creation flags.
 962                 NULL,           // Use parent's environment block.
 963                 NULL,           // Use parent's starting directory.
 964                 &si,            // Pointer to STARTUPINFO structure.
 965                 &pi)            // Pointer to PROCESS_INFORMATION structure.
 966        )
 967     {
 968         MessageBox(
 969             hParent,
 970             _("Error creating process: Check if gvim is in your path!"),
 971             _("gvimext.dll error"),
 972             MB_OK);
 973     }
 974     else
 975     {
 976         CloseHandle(pi.hProcess);
 977         CloseHandle(pi.hThread);
 978     }
 979
 980     free(cmdStr);
 981
 982     return NOERROR;
 983 }