nt/runemacs.c

   1 /* Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
   2      Free Software Foundation, Inc.
   3
   4 This file is part of GNU Emacs.
   5
   6 GNU Emacs is free software: you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation, either version 3 of the License, or
   9 (at your option) any later version.
  10
  11 GNU Emacs 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 GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19
  20 /*
  21   Simple program to start Emacs with its console window hidden.
  22
  23   This program is provided purely for convenience, since most users will
  24   use Emacs in windowing (GUI) mode, and will not want to have an extra
  25   console window lying around.  */
  26
  27 /*
  28    You may want to define this if you want to be able to install updated
  29    emacs binaries even when other users are using the current version.
  30    The problem with some file servers (notably Novell) is that an open
  31    file cannot be overwritten, deleted, or even renamed.  So if someone
  32    is running emacs.exe already, you cannot install a newer version.
  33    By defining CHOOSE_NEWEST_EXE, you can name your new emacs.exe
  34    something else which matches "emacs*.exe", and runemacs will
  35    automatically select the newest emacs executable in the bin directory.
  36    (So you'll probably be able to delete the old version some hours/days
  37    later).
  38 */
  39
  40 /* #define CHOOSE_NEWEST_EXE */
  41
  42 #include <windows.h>
  43 #include <string.h>
  44 #include <malloc.h>
  45
  46 static void set_user_model_id ();
  47
  48 int WINAPI
  49 WinMain (HINSTANCE hSelf, HINSTANCE hPrev, LPSTR cmdline, int nShow)
  50 {
  51   STARTUPINFO start;
  52   SECURITY_ATTRIBUTES sec_attrs;
  53   PROCESS_INFORMATION child;
  54   int wait_for_child = FALSE;
  55   DWORD priority_class = NORMAL_PRIORITY_CLASS;
  56   DWORD ret_code = 0;
  57   char *new_cmdline;
  58   char *p;
  59   char modname[MAX_PATH];
  60
  61   set_user_model_id ();
  62
  63   if (!GetModuleFileName (NULL, modname, MAX_PATH))
  64     goto error;
  65   if ((p = strrchr (modname, '\\')) == NULL)
  66     goto error;
  67   *p = 0;
  68
  69   new_cmdline = alloca (MAX_PATH + strlen (cmdline) + 3);
  70   /* Quote executable name in case of spaces in the path. */
  71   *new_cmdline = '"';
  72   strcpy (new_cmdline + 1, modname);
  73
  74 #ifdef CHOOSE_NEWEST_EXE
  75   {
  76     /* Silly hack to allow new versions to be installed on
  77        server even when current version is in use. */
  78
  79     char * best_name = alloca (MAX_PATH + 1);
  80     FILETIME best_time = {0,0};
  81     WIN32_FIND_DATA wfd;
  82     HANDLE fh;
  83     p = new_cmdline + strlen (new_cmdline);
  84     strcpy (p, "\\emacs*.exe\" ");
  85     fh = FindFirstFile (new_cmdline, &wfd);
  86     if (fh == INVALID_HANDLE_VALUE)
  87       goto error;
  88     do
  89       {
  90         if (wfd.ftLastWriteTime.dwHighDateTime > best_time.dwHighDateTime
  91             || (wfd.ftLastWriteTime.dwHighDateTime == best_time.dwHighDateTime
  92                 && wfd.ftLastWriteTime.dwLowDateTime > best_time.dwLowDateTime))
  93           {
  94             best_time = wfd.ftLastWriteTime;
  95             strcpy (best_name, wfd.cFileName);
  96           }
  97       }
  98     while (FindNextFile (fh, &wfd));
  99     FindClose (fh);
 100     *p++ = '\\';
 101     strcpy (p, best_name);
 102     strcat (p, " ");
 103   }
 104 #else
 105   strcat (new_cmdline, "\\emacs.exe\" ");
 106 #endif
 107
 108   /* Append original arguments if any; first look for arguments we
 109      recognise (-wait, -high, and -low), and apply them ourselves.  */
 110   while (cmdline[0] == '-' || cmdline[0] == '/')
 111     {
 112       if (strncmp (cmdline+1, "wait", 4) == 0)
 113         {
 114           wait_for_child = TRUE;
 115           cmdline += 5;
 116         }
 117       else if (strncmp (cmdline+1, "high", 4) == 0)
 118         {
 119           priority_class = HIGH_PRIORITY_CLASS;
 120           cmdline += 5;
 121         }
 122       else if (strncmp (cmdline+1, "low", 3) == 0)
 123         {
 124           priority_class = IDLE_PRIORITY_CLASS;
 125           cmdline += 4;
 126         }
 127       else
 128         break;
 129       /* Look for next argument.  */
 130       while (*++cmdline == ' ');
 131     }
 132
 133   strcat (new_cmdline, cmdline);
 134
 135   /* Set emacs_dir variable if runemacs was in "%emacs_dir%\bin".  */
 136   if ((p = strrchr (modname, '\\')) && stricmp (p, "\\bin") == 0)
 137     {
 138       *p = 0;
 139       for (p = modname; *p; p++)
 140         if (*p == '\\') *p = '/';
 141       SetEnvironmentVariable ("emacs_dir", modname);
 142     }
 143
 144   memset (&start, 0, sizeof (start));
 145   start.cb = sizeof (start);
 146   start.dwFlags = STARTF_USESHOWWINDOW | STARTF_USECOUNTCHARS;
 147   start.wShowWindow = SW_HIDE;
 148   /* Ensure that we don't waste memory if the user has specified a huge
 149      default screen buffer for command windows.  */
 150   start.dwXCountChars = 80;
 151   start.dwYCountChars = 25;
 152
 153   sec_attrs.nLength = sizeof (sec_attrs);
 154   sec_attrs.lpSecurityDescriptor = NULL;
 155   sec_attrs.bInheritHandle = FALSE;
 156
 157   if (CreateProcess (NULL, new_cmdline, &sec_attrs, NULL, TRUE, priority_class,
 158                      NULL, NULL, &start, &child))
 159     {
 160       if (wait_for_child)
 161         {
 162           WaitForSingleObject (child.hProcess, INFINITE);
 163           GetExitCodeProcess (child.hProcess, &ret_code);
 164         }
 165       CloseHandle (child.hThread);
 166       CloseHandle (child.hProcess);
 167     }
 168   else
 169     goto error;
 170   return (int) ret_code;
 171
 172 error:
 173   MessageBox (NULL, "Could not start Emacs.", "Error", MB_ICONSTOP);
 174   return 1;
 175 }
 176
 177 void set_user_model_id ()
 178 {
 179   HMODULE shell;
 180   HRESULT (WINAPI * set_user_model) (wchar_t * id);
 181
 182   /* On Windows 7 and later, we need to set the user model ID
 183      to associate emacsclient launched files with Emacs frames
 184      in the UI.  */
 185   shell = LoadLibrary ("shell32.dll");
 186   if (shell)
 187     {
 188       set_user_model
 189         = (void *) GetProcAddress (shell,
 190                                    "SetCurrentProcessExplicitAppUserModelID");
 191
 192       /* If the function is defined, then we are running on Windows 7
 193          or newer, and the UI uses this to group related windows
 194          together.  Since emacs, runemacs, emacsclient are related, we
 195          want them grouped even though the executables are different,
 196          so we need to set a consistent ID between them.  */
 197       if (set_user_model)
 198         set_user_model (L"GNU.Emacs");
 199
 200       FreeLibrary (shell);
 201     }
 202 }
 203
 204 /* arch-tag: 7e02df73-4df7-4aa0-baea-99c6d047a384
 205    (do not change this comment) */