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268 lines
7.7 KiB
C
268 lines
7.7 KiB
C
/* runemacs --- Simple program to start Emacs with its console window hidden.
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Copyright (C) 2001-2019 Free Software Foundation, Inc.
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This file is part of GNU Emacs.
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GNU Emacs is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at
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your option) any later version.
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GNU Emacs is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>. */
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/*
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Simple program to start Emacs with its console window hidden.
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This program is provided purely for convenience, since most users will
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use Emacs in windowing (GUI) mode, and will not want to have an extra
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console window lying around. */
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/*
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You may want to define this if you want to be able to install updated
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emacs binaries even when other users are using the current version.
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The problem with some file servers (notably Novell) is that an open
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file cannot be overwritten, deleted, or even renamed. So if someone
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is running emacs.exe already, you cannot install a newer version.
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By defining CHOOSE_NEWEST_EXE, you can name your new emacs.exe
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something else which matches "emacs*.exe", and runemacs will
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automatically select the newest emacs executable in the bin directory.
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(So you'll probably be able to delete the old version some hours/days
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later).
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*/
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/* #define CHOOSE_NEWEST_EXE */
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#include <windows.h>
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#include <string.h>
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#include <malloc.h>
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static void set_user_model_id (void);
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static int ensure_unicows_dll (void);
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int WINAPI
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WinMain (HINSTANCE hSelf, HINSTANCE hPrev, LPSTR cmdline, int nShow)
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{
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STARTUPINFO start;
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SECURITY_ATTRIBUTES sec_attrs;
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PROCESS_INFORMATION child;
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int wait_for_child = FALSE;
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DWORD priority_class = NORMAL_PRIORITY_CLASS;
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DWORD ret_code = 0;
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char *new_cmdline;
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char *p;
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char modname[MAX_PATH];
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static const char iconic_opt[] = "--iconic ", maximized_opt[] = "--maximized ";
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if (!ensure_unicows_dll ())
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goto error;
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set_user_model_id ();
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if (!GetModuleFileName (NULL, modname, MAX_PATH))
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goto error;
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if ((p = strrchr (modname, '\\')) == NULL)
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goto error;
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*p = 0;
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new_cmdline = alloca (MAX_PATH
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+ strlen (cmdline)
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+ ((nShow == SW_SHOWMINNOACTIVE
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|| nShow == SW_SHOWMAXIMIZED)
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? max (sizeof (iconic_opt), sizeof (maximized_opt))
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: 0)
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+ 3);
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/* Quote executable name in case of spaces in the path. */
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*new_cmdline = '"';
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strcpy (new_cmdline + 1, modname);
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/* Detect and handle un-installed runemacs.exe in nt/ subdirectory,
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while emacs.exe is in src/. */
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if ((p = strrchr (new_cmdline, '\\')) != NULL
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&& stricmp (p, "\\nt") == 0)
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strcpy (p, "\\src");
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#ifdef CHOOSE_NEWEST_EXE
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{
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/* Silly hack to allow new versions to be installed on
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server even when current version is in use. */
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char * best_name = alloca (MAX_PATH + 1);
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FILETIME best_time = {0,0};
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WIN32_FIND_DATA wfd;
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HANDLE fh;
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p = new_cmdline + strlen (new_cmdline);
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strcpy (p, "\\emacs*.exe\" ");
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fh = FindFirstFile (new_cmdline, &wfd);
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if (fh == INVALID_HANDLE_VALUE)
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goto error;
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do
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{
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if (wfd.ftLastWriteTime.dwHighDateTime > best_time.dwHighDateTime
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|| (wfd.ftLastWriteTime.dwHighDateTime == best_time.dwHighDateTime
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&& wfd.ftLastWriteTime.dwLowDateTime > best_time.dwLowDateTime))
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{
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best_time = wfd.ftLastWriteTime;
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strcpy (best_name, wfd.cFileName);
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}
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}
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while (FindNextFile (fh, &wfd));
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FindClose (fh);
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*p++ = '\\';
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strcpy (p, best_name);
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strcat (p, " ");
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}
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#else
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strcat (new_cmdline, "\\emacs.exe\" ");
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#endif
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/* Append original arguments if any; first look for arguments we
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recognize (-wait, -high, and -low), and apply them ourselves. */
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while (cmdline[0] == '-' || cmdline[0] == '/')
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{
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if (strncmp (cmdline+1, "wait", 4) == 0)
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{
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wait_for_child = TRUE;
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cmdline += 5;
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}
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else if (strncmp (cmdline+1, "high", 4) == 0)
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{
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priority_class = HIGH_PRIORITY_CLASS;
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cmdline += 5;
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}
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else if (strncmp (cmdline+1, "low", 3) == 0)
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{
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priority_class = IDLE_PRIORITY_CLASS;
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cmdline += 4;
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}
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else
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break;
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/* Look for next argument. */
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while (*++cmdline == ' ');
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}
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/* If the desktop shortcut properties tell to invoke runemacs
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minimized, or if they invoked runemacs via "start /min", pass
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'--iconic' to Emacs, as that's what users will expect. Likewise
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with invoking runemacs maximized: pass '--maximized' to Emacs. */
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if (nShow == SW_SHOWMINNOACTIVE)
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strcat (new_cmdline, iconic_opt);
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else if (nShow == SW_SHOWMAXIMIZED)
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strcat (new_cmdline, maximized_opt);
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strcat (new_cmdline, cmdline);
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/* Set emacs_dir variable if runemacs was in "%emacs_dir%\bin". */
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if ((p = strrchr (modname, '\\')) && stricmp (p, "\\bin") == 0)
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{
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*p = 0;
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for (p = modname; *p; p++)
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if (*p == '\\') *p = '/';
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SetEnvironmentVariable ("emacs_dir", modname);
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}
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memset (&start, 0, sizeof (start));
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start.cb = sizeof (start);
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start.dwFlags = STARTF_USESHOWWINDOW | STARTF_USECOUNTCHARS;
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start.wShowWindow = SW_HIDE;
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/* Ensure that we don't waste memory if the user has specified a huge
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default screen buffer for command windows. */
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start.dwXCountChars = 80;
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start.dwYCountChars = 25;
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sec_attrs.nLength = sizeof (sec_attrs);
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sec_attrs.lpSecurityDescriptor = NULL;
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sec_attrs.bInheritHandle = FALSE;
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if (CreateProcess (NULL, new_cmdline, &sec_attrs, NULL, TRUE, priority_class,
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NULL, NULL, &start, &child))
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{
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if (wait_for_child)
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{
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WaitForSingleObject (child.hProcess, INFINITE);
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GetExitCodeProcess (child.hProcess, &ret_code);
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}
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CloseHandle (child.hThread);
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CloseHandle (child.hProcess);
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}
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else
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goto error;
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return (int) ret_code;
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error:
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MessageBox (NULL, "Could not start Emacs.", "Error", MB_ICONSTOP);
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return 1;
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}
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void
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set_user_model_id (void)
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{
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HMODULE shell;
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HRESULT (WINAPI * set_user_model) (const wchar_t * id);
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/* On Windows 7 and later, we need to set the user model ID
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to associate emacsclient launched files with Emacs frames
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in the UI. */
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shell = LoadLibrary ("shell32.dll");
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if (shell)
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{
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set_user_model
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= (void *) GetProcAddress (shell,
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"SetCurrentProcessExplicitAppUserModelID");
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/* If the function is defined, then we are running on Windows 7
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or newer, and the UI uses this to group related windows
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together. Since emacs, runemacs, emacsclient are related, we
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want them grouped even though the executables are different,
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so we need to set a consistent ID between them. */
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if (set_user_model)
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set_user_model (L"GNU.Emacs");
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FreeLibrary (shell);
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}
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}
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static int
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ensure_unicows_dll (void)
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{
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OSVERSIONINFO os_ver;
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HMODULE h;
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ZeroMemory (&os_ver, sizeof (OSVERSIONINFO));
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os_ver.dwOSVersionInfoSize = sizeof (OSVERSIONINFO);
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if (!GetVersionEx (&os_ver))
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return 0;
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if (os_ver.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS)
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{
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h = LoadLibrary ("Unicows.dll");
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if (!h)
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{
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int button;
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button = MessageBox (NULL,
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"Emacs cannot load the UNICOWS.DLL library.\n"
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"This library is essential for using Emacs\n"
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"on this system. You need to install it.\n\n"
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"Emacs will exit when you click OK.",
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"Emacs cannot load UNICOWS.DLL",
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MB_ICONERROR | MB_TASKMODAL
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| MB_SETFOREGROUND | MB_OK);
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switch (button)
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{
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case IDOK:
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default:
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return 0;
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}
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}
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FreeLibrary (h);
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return 1;
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}
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return 1;
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}
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