.gitignore tweaks
[emacs.git] / nt / runemacs.c
blob3fcf405f6d4030756911fc31294113fdabe3dfbb
1 /* runemacs --- Simple program to start Emacs with its console window hidden.
3 Copyright (C) 2001-2015 Free Software Foundation, Inc.
5 This file is part of GNU Emacs.
7 GNU Emacs is free software: you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation, either version 3 of the License, or
10 (at your option) any later version.
12 GNU Emacs is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
22 Simple program to start Emacs with its console window hidden.
24 This program is provided purely for convenience, since most users will
25 use Emacs in windowing (GUI) mode, and will not want to have an extra
26 console window lying around. */
29 You may want to define this if you want to be able to install updated
30 emacs binaries even when other users are using the current version.
31 The problem with some file servers (notably Novell) is that an open
32 file cannot be overwritten, deleted, or even renamed. So if someone
33 is running emacs.exe already, you cannot install a newer version.
34 By defining CHOOSE_NEWEST_EXE, you can name your new emacs.exe
35 something else which matches "emacs*.exe", and runemacs will
36 automatically select the newest emacs executable in the bin directory.
37 (So you'll probably be able to delete the old version some hours/days
38 later).
41 /* #define CHOOSE_NEWEST_EXE */
43 #include <windows.h>
44 #include <string.h>
45 #include <malloc.h>
47 static void set_user_model_id (void);
48 static int ensure_unicows_dll (void);
50 int WINAPI
51 WinMain (HINSTANCE hSelf, HINSTANCE hPrev, LPSTR cmdline, int nShow)
53 STARTUPINFO start;
54 SECURITY_ATTRIBUTES sec_attrs;
55 PROCESS_INFORMATION child;
56 int wait_for_child = FALSE;
57 DWORD priority_class = NORMAL_PRIORITY_CLASS;
58 DWORD ret_code = 0;
59 char *new_cmdline;
60 char *p;
61 char modname[MAX_PATH];
63 if (!ensure_unicows_dll ())
64 goto error;
66 set_user_model_id ();
68 if (!GetModuleFileName (NULL, modname, MAX_PATH))
69 goto error;
70 if ((p = strrchr (modname, '\\')) == NULL)
71 goto error;
72 *p = 0;
74 new_cmdline = alloca (MAX_PATH + strlen (cmdline) + 3);
75 /* Quote executable name in case of spaces in the path. */
76 *new_cmdline = '"';
77 strcpy (new_cmdline + 1, modname);
78 /* Detect and handle un-installed runemacs.exe in nt/ subdirectory,
79 while emacs.exe is in src/. */
80 if ((p = strrchr (new_cmdline, '\\')) != NULL
81 && stricmp (p, "\\nt") == 0)
82 strcpy (p, "\\src");
84 #ifdef CHOOSE_NEWEST_EXE
86 /* Silly hack to allow new versions to be installed on
87 server even when current version is in use. */
89 char * best_name = alloca (MAX_PATH + 1);
90 FILETIME best_time = {0,0};
91 WIN32_FIND_DATA wfd;
92 HANDLE fh;
93 p = new_cmdline + strlen (new_cmdline);
94 strcpy (p, "\\emacs*.exe\" ");
95 fh = FindFirstFile (new_cmdline, &wfd);
96 if (fh == INVALID_HANDLE_VALUE)
97 goto error;
100 if (wfd.ftLastWriteTime.dwHighDateTime > best_time.dwHighDateTime
101 || (wfd.ftLastWriteTime.dwHighDateTime == best_time.dwHighDateTime
102 && wfd.ftLastWriteTime.dwLowDateTime > best_time.dwLowDateTime))
104 best_time = wfd.ftLastWriteTime;
105 strcpy (best_name, wfd.cFileName);
108 while (FindNextFile (fh, &wfd));
109 FindClose (fh);
110 *p++ = '\\';
111 strcpy (p, best_name);
112 strcat (p, " ");
114 #else
115 strcat (new_cmdline, "\\emacs.exe\" ");
116 #endif
118 /* Append original arguments if any; first look for arguments we
119 recognize (-wait, -high, and -low), and apply them ourselves. */
120 while (cmdline[0] == '-' || cmdline[0] == '/')
122 if (strncmp (cmdline+1, "wait", 4) == 0)
124 wait_for_child = TRUE;
125 cmdline += 5;
127 else if (strncmp (cmdline+1, "high", 4) == 0)
129 priority_class = HIGH_PRIORITY_CLASS;
130 cmdline += 5;
132 else if (strncmp (cmdline+1, "low", 3) == 0)
134 priority_class = IDLE_PRIORITY_CLASS;
135 cmdline += 4;
137 else
138 break;
139 /* Look for next argument. */
140 while (*++cmdline == ' ');
143 strcat (new_cmdline, cmdline);
145 /* Set emacs_dir variable if runemacs was in "%emacs_dir%\bin". */
146 if ((p = strrchr (modname, '\\')) && stricmp (p, "\\bin") == 0)
148 *p = 0;
149 for (p = modname; *p; p++)
150 if (*p == '\\') *p = '/';
151 SetEnvironmentVariable ("emacs_dir", modname);
154 memset (&start, 0, sizeof (start));
155 start.cb = sizeof (start);
156 start.dwFlags = STARTF_USESHOWWINDOW | STARTF_USECOUNTCHARS;
157 start.wShowWindow = SW_HIDE;
158 /* Ensure that we don't waste memory if the user has specified a huge
159 default screen buffer for command windows. */
160 start.dwXCountChars = 80;
161 start.dwYCountChars = 25;
163 sec_attrs.nLength = sizeof (sec_attrs);
164 sec_attrs.lpSecurityDescriptor = NULL;
165 sec_attrs.bInheritHandle = FALSE;
167 if (CreateProcess (NULL, new_cmdline, &sec_attrs, NULL, TRUE, priority_class,
168 NULL, NULL, &start, &child))
170 if (wait_for_child)
172 WaitForSingleObject (child.hProcess, INFINITE);
173 GetExitCodeProcess (child.hProcess, &ret_code);
175 CloseHandle (child.hThread);
176 CloseHandle (child.hProcess);
178 else
179 goto error;
180 return (int) ret_code;
182 error:
183 MessageBox (NULL, "Could not start Emacs.", "Error", MB_ICONSTOP);
184 return 1;
187 void
188 set_user_model_id (void)
190 HMODULE shell;
191 HRESULT (WINAPI * set_user_model) (wchar_t * id);
193 /* On Windows 7 and later, we need to set the user model ID
194 to associate emacsclient launched files with Emacs frames
195 in the UI. */
196 shell = LoadLibrary ("shell32.dll");
197 if (shell)
199 set_user_model
200 = (void *) GetProcAddress (shell,
201 "SetCurrentProcessExplicitAppUserModelID");
203 /* If the function is defined, then we are running on Windows 7
204 or newer, and the UI uses this to group related windows
205 together. Since emacs, runemacs, emacsclient are related, we
206 want them grouped even though the executables are different,
207 so we need to set a consistent ID between them. */
208 if (set_user_model)
209 set_user_model (L"GNU.Emacs");
211 FreeLibrary (shell);
215 static int
216 ensure_unicows_dll (void)
218 OSVERSIONINFO os_ver;
219 HMODULE h;
221 ZeroMemory (&os_ver, sizeof (OSVERSIONINFO));
222 os_ver.dwOSVersionInfoSize = sizeof (OSVERSIONINFO);
223 if (!GetVersionEx (&os_ver))
224 return 0;
226 if (os_ver.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS)
228 h = LoadLibrary ("Unicows.dll");
229 if (!h)
231 int button;
233 button = MessageBox (NULL,
234 "Emacs cannot load the UNICOWS.DLL library.\n"
235 "This library is essential for using Emacs\n"
236 "on this system. You need to install it.\n\n"
237 "Emacs will exit when you click OK.",
238 "Emacs cannot load UNICOWS.DLL",
239 MB_ICONERROR | MB_TASKMODAL
240 | MB_SETFOREGROUND | MB_OK);
241 switch (button)
243 case IDOK:
244 default:
245 return 0;
248 FreeLibrary (h);
249 return 1;
251 return 1;